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Pakistan made weapon systems.

NATIONAL RADIO AND TELECOMMUNICATION CORPORATIon



National Radio and Telecommunication Corporation (NRTC) is a World-Class telecommunication and electronic equipment manufacturer. We have built our business around our ability to offer creative and tailored solutions worldwide, providing the best total value while building premier customer relationships.

Since 1965, NRTC has been a highly stable and reliable partner for customers who require high-tech communication equipment and solutions. Our success comes from the innovative value proposition we bring to electronic manufacturing. Proof of its uniqueness is in our enviable track record for decades.

At NRTC, we build lasting relationships with our customers through provisioning of quality solutions and unparalleled 24x7 support based upon commitment and dedication.

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To provide our customers world class quality telecommunication equipment which meets all their operational requirements, in time, at affordable costs. User’s satisfaction is our top priority in the process chain, from receipt of raw material, through manufacturing and delivery, till final acceptance.





Our mission is based on Unique Solutions through Innovation, at NRTC; we work for our customers to achieve this for both new and evolving product requirements.

At NRTC, We Meet Challenging Demands and excel in Competition by

- Continuous up-gradation and use of innovative concepts/ state of the art tools.
- Designing for Testing, Manufacturing, Process and Experiment.
- Continuous investment in testing equipment and skills enhancement for product development.


With its highly skilled design Team equipped with state of the art test equipment and development tools, our R&D is working on modern technologies and designing of wide array of complex telecom equipment, systems and solutions; which include:

- Communication Security Solutions
- Backbone Communication Solutions (microwave line of sight Systems)
- Total communication system solutions according to customers' needs
- Software Defined Radio System
- Integrated Land Mobile Radio Systems
- Customized Software Applications Development
- Switching equipment (TDM and IP based)
- Optical Communication Products
 
Short Range Ground Surveillance Radar
We are working on development of short range ground surveillance radar for detection of moving targets. The project provides an opportunity to develop know-how of complete electronic system design and development and at the same time, the project acts as a platform for working on research areas of current interest such as automatic target classification, high resolution representation of radar micro-Doppler signal and rain clutter mitigation (range enhancement using signal processing). Our electronic system development effort is geared towards acquiring the know-how to conceive design and develop a complete electronic system that meets a given set of user requirements. In order to meet these system level requirements we have designed and fabricated its components such as antenna, microwave circuits and modules, baseband circuits, DSP system, built-in test and monitoring, turn tilt platform and mechanical hardware.



NR-V3, a solid state coherent pulse doppler radar for detection of moving vehicles and pedestrians up to a range of 4 km for pedestrians and 12 km for vehicles
radar-jpg.91696


Microstrip Antennas and Arrays
16x12 Folded Dipole Array Antenna:
Specifications:

Half power Beamwidth E plane : 4.2º H plane : 5.7º

Gain 28±1 dB

Sidelobe Level ≤ -18 dB

Frequency Ku Band

VSWR Bandwidth 800 MHz
folded-dipole-16x12-jpg.91697


32x12 Folded Dipole Array Antenna:
Specifications:

Half power Beamwidth E plane : 2.2º H plane : 5.7º

Gain 29±1 dB

Sidelobe Level ≤ -20 dB

Frequency Ku Band

VSWR Bandwidth 600 MHz

folded-dipole-32x12-jpg.91698


8x8 Aperture Coupled Microstrip Patch Array Antenna:
Specifications:

Half power Beamwidth E plane : 9.9º H plane : 10.34º

Gain ??

Sidelobe Level ≤ -16 dB

Frequency ??

VSWR Bandwidth ??

aperture8x8-jpg.91710


Planer Inverted-F Antenna (PIFA):
In this work, multiband planer inverted-F antenna with 6mm height was designed, simulated in HFSS and fabricated for operating in the GSM, DCS and WLAN bands. In addition, a reduced height planer inverted-F antenna with 2mm height was also designed simulated and fabricated for application in multiband slim handsets.

Publications:
  • Rehman Ahmed, “Low Profile Antennas for Mobile Communication Applications,” MS Thesis, College of E&ME, NUST, 2009.
Compact Wideband Broad Side Rectangular Microstrip Antenna
This work includes simulation and experimental results for wide band U-shaped side slots loaded linearly polarized rectangular microstrip antenna with broad side radiation characteristics suitable for onboard applications in S-band. Impedence bandwidth of 34.8% as compared to 2-5% bandwidth of conventional microstrip antenna has been achieved.

Publications:
  • Hafiz Muhammad Jafar, “Development of Compact Wide-band Broad Side RMSA Suitable for on-board Applications,” MS Thesis, College of E&ME, NUST, 2009.
Patch Antenna Embedded in Dielectric Coating
In this work, frequency selective surface has been implemented over radome to address the issue of composite radome matching. Different planer artificial structures are implemented surrounding the antenna aperture to restore the broad coverage of patch antenna with low return loss. Implementation of artificially hard boundary in the form of longitudinal metallic strips restores the -3 dB beamwidth (
gif.latex
) of the antenna in E-plane at the cost of antenna gain. Soft ring over dielectric coating surrounding the antenna aperture is optimized here for broad beamwidth (
gif.latex
) in E-plane with increased gain near to 7 dB by suppressing the creeped RF energy from thick dielectric coating.

Publications:
  • Javed Ahmad, “Ratiation Pattern Improvement of Patch Antenna Embedded in Dielectric Coating using Artificial Surfaces,” MS Thesis, College of E&ME, NUST, 2009.

Microstrip Star Shaped Patch Antenna:
Specifications:

Half power Beamwidth E plane : 34º H plane : 36º
qasim-starshaped-png.91711

Gain 10.2 dBi

Frequency Ku Band

Fractal Antennas
High Directivity Fractal Antenna:

Specifications:

Half power Beamwidth E plane : 27º H plane : 31º

Gain 12.5 ± 0.5 dB

Sidelobe Level ≤ -12.5 dB

Frequency 3 GHz

VSWR Bandwidth 450 MHz

85996b5ef30e501601f46df8c910be00-png.91721

Publications:
  • Abbas Bin Younas Awan, Zubair Ahmed and Mojeeb Bin Ihsan, “A New High Directivity Fractal Antenna Based on the Modified Koch Snowflake Geometry” Asia Pacific Microwave Conference (APMC 2010) Dec 7-10, 2010, Yokohama Japan.
  • Abbas Bin Younas Awan, “High Directivity Fractal Antenna,” MS Thesis, College of E&ME, NUST, 2010.

Multiband Fractal Antenna:
Sierpinski fractal monopole antenna and its scale factor variations have been studied. The Sierpinski fractal monopole antenna designed exhibits multiband behavior with three log-periodic bands, spaced with a log-period of 2. The number of log-periodic bands is proportional to the number of fractal iterations. By changing the geometrical scale factor of the Sierpinski Fractal, the band positions are changed accordingly, which confirms that the band positions correspond to the geometrical scale factor of the Sierpinski fractal, but it results in poor input matching (the return loss of the three log periodic bands being approximately -9 dB). This poor input matching is improved by using microstrip line feeding and consequently the return loss of the log-periodic bands improves to less than -15 dB.

43fc8ad1d2441658e1b48f97aed8f230-png.91722

c4cc452f19ed26bb1e0bf4c22bfb22b3-png.91723

Publications:
  • Muhammad Waqas, Zubair Ahmed and Mojeeb Bin Ihsan, “Multiband Sierpinski Fractal Antenna”, IEEE International Multitopic Conference, Islamabad, Pakistan, Dec 2009, pp. 376-381.
  • Muhammad Waqas, “Multiband Fractal Antenna,”, MS Thesis, College of E&ME, NUST, 2009.
 
Triangular Patch Antenna Using Partial Koch Fractal Boundary:
Specifications:

Half power Beamwidth E plane : 70º H plane : 112º

Gain 9.5±0.5 dB

Sidelobe Level ≤ -18 dB

Frequency 3.6 GHz

VSWR Bandwidth 240 MHz

3dfe053e5c4c0a09ec3aa8a07fc7a476-png.91724

Publications:
  • D. Fazal, Q.U. Khan and Mojeeb Bin Ihsan “Use of partial Koch boundaries for improved return loss, gain and sidelobe levels of triangular patch antenna” Electronic Letters 19th July 2012 Vol.48 No.15.
  • D. Fazal, “Improvement in the Performance of Triangular Patch Antenna using Partial Koch Fractal Boundary,”, MS Thesis, College of E&ME, NUST, 2012.

Slotted Waveguide Antennas
20x12 Slotted Wave Guide Array Antenna:
Specifications:

Half power Beamwidth E plane : 4.1º H plane : 7.2º

Gain 28.5 ± 0.5 dB

Sidelobe Level ≤ -19 dB

Frequency Ku Band

VSWR Bandwidth 100 MHz

a108142a5355a8fdc3dd8e9dc992577f-png.91728

Publications:
  • Sara H. Dar, Zubair Ahmed, Mojeeb Bin Ihsan, “Characterization of Waveguide Slots Using Full Wave EM Analysis Software HFSS’, IEEE INMIC Conference Proceedings, Karachi, Pakistan, Dec 2008, pp. 85-90.
  • Sara Hameed Dar, Zubair Ahmed, and Mojeeb Bin Ihsan “Design of a Low Side Lobe Slotted Waveguide Planar Array”, Fifth International Bhurban Conference on Applied Sciences and Technology, IBCAST, Islamabad, Pakistan, 8th -11th January, 2007. pp. 31-34.
  • Sara H. Dar, “Design of a Low Side Lobe Slotted Waveguide Planar Array,” College of E&ME, NUST, 2007.

Reflector and Reflect Array Antennas
Ku Band Reflect Array Antenna:
Specifications:

Half power Beamwidth E plane : 4º H plane : 5º

Gain 22.2 dB

Sidelobe Level ≤ -10 dB

Frequency Ku Band

76f33b79f7985ed83a96f7d4a58c8986-png.91729

Journal Publications:
  • Muhammad Wasif, Zubair Ahmed and Mojeeb Bin Ihsan, “Performance of Thinned Mcrostrip Reflectarrays” IACSIT International Journal of Engineering and Technology, Vol-2, No. 2, pp 581-585 Dec 2010.
Conference Publications:
  • Muhammad Wasif, Zubair Ahmed and Mojeeb Bin Ihsan, “Performance Comparison of Different Aperture Shapes for Microstrip Reflectarray,” German Microwave Conference (GeMIC), Germany, Mar 2010, pp 250 to 253.
  • Muhammad Wasif, Zubair Ahmed and Mojeeb Bin Ihsan, “Comparison of Microstrip Reflectarray for Different Aperture Shapes and Different Grid Settings of Elementary Antennas on its Aperture” IEEE International Conference on Antennas, Propagation and Systems (INAS 2009), Dec 2009, Johor Malaysia. Pp.110-1 to 110-5.
Thesis:
  • Muhammad Wasif, “Design and Fabrication of Microstrip Reflectarray using Patches of Variable Size,” College of E&ME, NUST, 2009.

Frequency Independent Antennas
Spiral Antenna:

Archimedean Spiral and Equiangular Spiral Antenna has been designed, simulated and fabricated for the 2GHz to 18GHz bandwidth, |Axial ratio| ≤ 3dB and typical VSWR ≤ 2.

15% Reduction in size has been achieved and the parameters of Meander Arm Spiral are better than the classical antenna.

fa1c90d1090f9ad8d1f3b8eadfe40251-png.91730

Publications:
  • Zia Ullah Khan, “Simulation Design of Spiral Antenna,” MS Thesis, College of E&ME, NUST, 2009

Automatic Target Classification
We are working on automatic target recognition problem for ground surveillance radar NR-V3. The goal of this research is to develop an automatic target classifier that can classify ground targets detected by NR-V3 radar. The work is based on extracting the micro-Doppler features from the backscattered signal using signal processing and then classifying them using machine learning techniques.

In addition, we are developing high resolution 2D time-frequency representation of pedestrian micro-Doppler signature.

b3e1bcf8e6c7559de8a4ce7179ebb009-png.91732

Scatter plot showing first 3 feature vectors of NR-V3 data
This work has resulted in a number of publications :

Machine Learning:

Joint time-frequency Representation:
5b0db577983c8d06897a3a74b89362d9-png.91733

  • S. Liaqat , M. B. Ihsan, S. Z. Asghar , A. Ejaz, A. Javed, "High resolution 2D time frequency representation of radar micro-Doppler pedestrian signal", Radar Conference (EuRAD), 2013, 10th European, Oct. 9 2013-Oct. 11 2013, pp 515-518.

Microwave Systems
Microwave Transmitter Module for Ku Band

826ca8c887044c2e0f91a91f74ba5195-jpg.91734

Microwave Transmitter Module for Ku Band
Microwave Tranceiver Module for Ku Band
08f6b1589e61ff174b285fd0451aee51-jpg.91735

Microwave Tranceiver Module for Ku Band
Microwave Receiver Module for Ku Band
f4d09dac64f750788ef1f1099ceaab1c-jpg.91736

Microwave Receiver Module for Ku Band

Amplifiers
Spatial Power Combining in Rectangular Waveguides using Dense Finline Arrays:

Spatial power combiners using dense finline arrays (tapered slot antennas) arranged in tray configuration and enclosed in a standard Ku band waveguide (WR-62) have been designed in this work. The design of the finline taper is the most challenging aspect in this work. Before the tapers can be synthesized, a relationship between phase constant of the finline array and its geometrical parameters must be established which can only be achieved through full wave EM analysis. Matlab codes were developed using Spectral Domain Method (SDM) to extract this relationship for single-tray finline, two-tray finline and four-tray finline configuration. Results of SDM codes were also compared with Ansoft HFSS and were found to be in good aggrement. Two tray finline and Four tray finline tapers along with dielectric matching, connected back to back were fabricated and tested using Time Domain Gating feature of Network Analyzer. Results indicate measured return loss of 26.3 dB as compared to simulated return loss of 23.5 dB for single tray finline, 19 dB as compared to simulated return loss of 18.6 dB for two tray finline and 16 dB as compared to simulated return loss of 15.5 dB for four tray finline at 16 GHz.

Publications:
  • M. Anis Chaudhary, “Spatial Power Combining in Rectangular Waveguides using Dense Finline Arrays,” MS Thesis, College of E&ME, NUST, 2010.
 
High Performance GaN based Switch Mode Class F and Inverse Class F Power Amplifier:
This work is based on design and development of Class AB, Class F and Class
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power amplifiers using GaN based transistors. A comparison has been done between these amplifiers based on output power and efficiency. Effect of input harmonic termination on efficiency and output power in Class F and Class
gif.latex
power amplifiers has also been investigated.

ec02892a230298cf77601e4974ea2897-png.91766

Inverse Class F design
f47076cf4c6f32e45af23d53090810c8-png.91767

Class F design
1fcdb588c53e286652e0baea13a3e2c0-png.91768

Class AB design
Publications:
  • Ali Ahmed, “High Performance GaN based Switch Mode Class F and Inverse Class F Power Amplifier,” MS Thesis, College of E&ME, NUST, 2012.

Filters
Substrate Integrated Waveguide Filter:

Substrate integrated waveguide filters at X and Ku band have been designed which involves determining the width of iris as a function of coupling factor. For this purpose, a design curve of iris width vs coupling was generated using HFSS. Two 5 pole Chebyshev bandpass filters have been fabricated on 4003 Rogers. Measured results at 10 GHz presents 380 MHz bandwidth, 6.6 dB insertion loss and return loss better than 12.5 dB. Measured results at 16 GHz presents 410 MHz bandwidth, 8.1 dB insertion loss and return loss better than 13 dB.

Publications:
  • Umar Hasan Khan, “A Narrow Band Subsrate Integrated Waveguide Filter using EM Simulation,” MS Thesis, College of E&ME, NUST, 2013.
Compact UWB Bandpass Filter with High Stopband Rejection:
Thesis research is based on the development of compact UWB bandpass filter for UWB communication in 3.1-10.6 GHz band. Two fourth order UWB filters are designed; one by direct coupling of three E-structures and other by capacitive coupling of two E-structures. Filter based on directly coupled E-shape structures has fractional bandwidth of 97%, maximum flat band insertion loss of 1.3dB, maximum returnloss of 9dB and rejection better than 20dB in GPS band. Chip loaded filterhas fractional bandwidth of 115%, maximum flat band insertion loss of 0.25dB, maximum return loss of 11 dB and rejection better than 25dB in GPS band.

40d6fb44f0ec9a5f34f4c00aff303d71-jpeg.91769

Three cascaded E-shape Structure
894e412e953a7146354468afe2f1e7df-jpeg.91770

Chip Loaded E-shape Structure
Publications:
  • Bilal Aslam, “Packaged Ultra Wide Band Filter,” MS Thesis, College of E&ME, NUST, 2013

Parallel Coupled Microstrip Bandpass Filter
A fourth order paralled coupled Microstrip band pass filter was designed using chebychev low pass prototype and was simulated on Harmonica and further on EM analysis tool Sonnet to take into account the physical layout and packaging effects. The filter was designed to operate at a centre frequency of 1 GHz and a bandwidth of 200 MHz with pass band ripple of 0.01 dB. The measured results show insertion loss of -1.2 dB and bandwidth of 220 MHz at centre frequency of 1 GHz.

Publications:
  • Tahir Abbas, Zubair Ahmed and Mojeeb Bin Ihsan “Parallel Coupled Microstrip Band Pass Filter Design using EM-Analysis”, Proceedings of IEEE INMIC 2004 8th International Multitopic Conference Islamabad Pakistan, 24-26 December 2004, pp 703-705.
  • Tahir Abbas, Zubair Ahmed and Mojeeb Bin Ihsan. “Design of Coupled-Line Coupled Hairpin-Line Filter Using EM Analysis for Parameter Extraction”, Third International Bhurban Conference on Applied Sciences and Technology, Bhurban, Pakistan, 7-12 June, 2004, pp 740-745.

Circularly Polarized Antenna Array using Sequential Rotation Technique:
In this project, circularly polarized antenna has been designed for the application domain of Direct Broadcasting Satellites (DBS) using sequential rotation technique. Using this technique, 2 GHz bandwidth has been achieved which is a necessity for efficient performance since DBS operational range is 10.7-12.7 GHz. In addition, good circular polarization and low VSWR over a wide frequency band has been achieved. The axial ratio approaches 0 dB at boresight with 0.47 GHz bandwidth making the antenna broadband both in terms of VSWR and axial ratio bandwidth.

Project Supervisors: Prof Dr. Mojeeb Bin Ihsan, Asst Prof Zubair Ahmed

Group Members: (BE Elect Engg) Kashif Raheem, Saqib Waseem

J-Band Offset Parabolic Reflector Antenna:
In this project, fundamental principles of antenna theory have been applied to the analysis and design of pyramidal horn and parabolic offset reflector antennas respectively. MATLAB code was written to evaluate parameters of reflector and pyramidal horn antenna and simulations were also done in MATLAB to evaluate radiation power patterns of both antennas. Results of these simulations were compared with the simulations done with ‘SABOOR’ software based on the same dimensions and specs. Reflector and horn antenna were then manufactured locally in two iterations.

Project Supervisors: Prof Dr. Mojeeb Bin Ihsan, Asst Prof Zubair Ahmed

Group Members: (BE Elect Engg) Muhammad Shoaib Anwar, Omer Mukhtar

View attachment 208bc6abdd9e152dcdf0b2de27fd05d2.bmp_.jpg

Oscillators
Performance Analysis of Various Circuit Topologies of DROs Designed at Ku Band Frequencies

Transistor oscillators with high-Q, temperature-stable dielectric resonators as frequency determining elements, are widely used as stable sources for microwave systems. In this work, 14.4 GHz HEMT and FET DROs and 16 GHz HEMT DRO have been designed and implemented and a comparison of their general characteristics has been made. 14.4 GHz FET DRO exhibits the best performance with 6 dBm output power and phase noise -100.7 dBC/Hz at 100 kHz offset.

Publications:
  • Yawar Nadeem, “Performance Analysis of Various Circuit Topologies of DROs Designed at Ku Band Frequencies,” MS Thesis, College of E&ME, NUST, 2006.
 
At this stage no one "has" the hypersonic CM technology , countries are working on it & chinese wont be far behind - you may see one faster than you think.
 
Short Range Ground Surveillance Radar
We are working on development of short range ground surveillance radar for detection of moving targets. The project provides an opportunity to develop know-how of complete electronic system design and development and at the same time, the project acts as a platform for working on research areas of current interest such as automatic target classification, high resolution representation of radar micro-Doppler signal and rain clutter mitigation (range enhancement using signal processing). Our electronic system development effort is geared towards acquiring the know-how to conceive design and develop a complete electronic system that meets a given set of user requirements. In order to meet these system level requirements we have designed and fabricated its components such as antenna, microwave circuits and modules, baseband circuits, DSP system, built-in test and monitoring, turn tilt platform and mechanical hardware.



NR-V3, a solid state coherent pulse doppler radar for detection of moving vehicles and pedestrians up to a range of 4 km for pedestrians and 12 km for vehicles
radar-jpg.91696


Microstrip Antennas and Arrays
16x12 Folded Dipole Array Antenna:
Specifications:

Half power Beamwidth E plane : 4.2º H plane : 5.7º

Gain 28±1 dB

Sidelobe Level ≤ -18 dB

Frequency Ku Band

VSWR Bandwidth 800 MHz
folded-dipole-16x12-jpg.91697


32x12 Folded Dipole Array Antenna:
Specifications:

Half power Beamwidth E plane : 2.2º H plane : 5.7º

Gain 29±1 dB

Sidelobe Level ≤ -20 dB

Frequency Ku Band

VSWR Bandwidth 600 MHz

folded-dipole-32x12-jpg.91698


8x8 Aperture Coupled Microstrip Patch Array Antenna:
Specifications:

Half power Beamwidth E plane : 9.9º H plane : 10.34º

Gain ??

Sidelobe Level ≤ -16 dB

Frequency ??

VSWR Bandwidth ??

aperture8x8-jpg.91710


Planer Inverted-F Antenna (PIFA):
In this work, multiband planer inverted-F antenna with 6mm height was designed, simulated in HFSS and fabricated for operating in the GSM, DCS and WLAN bands. In addition, a reduced height planer inverted-F antenna with 2mm height was also designed simulated and fabricated for application in multiband slim handsets.

Publications:
  • Rehman Ahmed, “Low Profile Antennas for Mobile Communication Applications,” MS Thesis, College of E&ME, NUST, 2009.
Compact Wideband Broad Side Rectangular Microstrip Antenna
This work includes simulation and experimental results for wide band U-shaped side slots loaded linearly polarized rectangular microstrip antenna with broad side radiation characteristics suitable for onboard applications in S-band. Impedence bandwidth of 34.8% as compared to 2-5% bandwidth of conventional microstrip antenna has been achieved.

Publications:
  • Hafiz Muhammad Jafar, “Development of Compact Wide-band Broad Side RMSA Suitable for on-board Applications,” MS Thesis, College of E&ME, NUST, 2009.
Patch Antenna Embedded in Dielectric Coating
In this work, frequency selective surface has been implemented over radome to address the issue of composite radome matching. Different planer artificial structures are implemented surrounding the antenna aperture to restore the broad coverage of patch antenna with low return loss. Implementation of artificially hard boundary in the form of longitudinal metallic strips restores the -3 dB beamwidth (
gif.latex
) of the antenna in E-plane at the cost of antenna gain. Soft ring over dielectric coating surrounding the antenna aperture is optimized here for broad beamwidth (
gif.latex
) in E-plane with increased gain near to 7 dB by suppressing the creeped RF energy from thick dielectric coating.

Publications:
  • Javed Ahmad, “Ratiation Pattern Improvement of Patch Antenna Embedded in Dielectric Coating using Artificial Surfaces,” MS Thesis, College of E&ME, NUST, 2009.

Microstrip Star Shaped Patch Antenna:
Specifications:

Half power Beamwidth E plane : 34º H plane : 36º
qasim-starshaped-png.91711

Gain 10.2 dBi

Frequency Ku Band

Fractal Antennas
High Directivity Fractal Antenna:
Specifications:

Half power Beamwidth E plane : 27º H plane : 31º

Gain 12.5 ± 0.5 dB

Sidelobe Level ≤ -12.5 dB

Frequency 3 GHz

VSWR Bandwidth 450 MHz

85996b5ef30e501601f46df8c910be00-png.91721

Publications:
  • Abbas Bin Younas Awan, Zubair Ahmed and Mojeeb Bin Ihsan, “A New High Directivity Fractal Antenna Based on the Modified Koch Snowflake Geometry” Asia Pacific Microwave Conference (APMC 2010) Dec 7-10, 2010, Yokohama Japan.
  • Abbas Bin Younas Awan, “High Directivity Fractal Antenna,” MS Thesis, College of E&ME, NUST, 2010.

Multiband Fractal Antenna:
Sierpinski fractal monopole antenna and its scale factor variations have been studied. The Sierpinski fractal monopole antenna designed exhibits multiband behavior with three log-periodic bands, spaced with a log-period of 2. The number of log-periodic bands is proportional to the number of fractal iterations. By changing the geometrical scale factor of the Sierpinski Fractal, the band positions are changed accordingly, which confirms that the band positions correspond to the geometrical scale factor of the Sierpinski fractal, but it results in poor input matching (the return loss of the three log periodic bands being approximately -9 dB). This poor input matching is improved by using microstrip line feeding and consequently the return loss of the log-periodic bands improves to less than -15 dB.

43fc8ad1d2441658e1b48f97aed8f230-png.91722

c4cc452f19ed26bb1e0bf4c22bfb22b3-png.91723

Publications:
  • Muhammad Waqas, Zubair Ahmed and Mojeeb Bin Ihsan, “Multiband Sierpinski Fractal Antenna”, IEEE International Multitopic Conference, Islamabad, Pakistan, Dec 2009, pp. 376-381.
  • Muhammad Waqas, “Multiband Fractal Antenna,”, MS Thesis, College of E&ME, NUST, 2009.


@amardeep mishra

Short Range Ground Surveillance Radar

very similar to indian (BFSR-SR)

This is the same project of NUST,i told you in 2010-11


@amardeep mishra

GSR ,Ground surveillance radar is a class of radar sensors that monitor activity surrounding or on critical infrastructure areas such as airports,[1] seaports, military installations, national borders, refineries and other critical industry and the like. Such radars are characterized by their ability to detect movement at ground level of targets such as an individual walking or crawling towards a facility. Such radars typically have ranges of several hundred metres to over 10 kilometers.

Pakistan's Ministry of defense production launched a Research and development project for completely indigenous production of a GSR in collaboration with EME and other departments of NUST.
A total of 39 Million Rs were allocated for R&D. The preliminary/Theoretical work was completed within an year with 20+ PHD students working on the project. The project was so successful that AESA and PESA technologies seemed conceivable within Pakistan's own expertise and resources.
International Microwave journal IEEE received and published dozens of research papers about Radar technology from the students working on this project. See project 274 on NUST website
NESCOM was given the task of further developing the AESA , PESA related research which branched out of this project. 300 Million USD were allocated for Pakistan's own dedicated Electronics R&D labs near Islamabad which had to be a subsidiary of NESCOM.
Unfortunately the labs never materialized in its desired form. Much of the funds dedicated for the lab were diverted to other civilian projects by PPP Prime minister Raja Pervez Ashraf.
A toned down NESCOM Electronics complex was completed in 2012,but was again a victim of financial corruption and could not do any mlre than manufacturing Motherboards for NRTC's Software defined radios.

The research on further development and building of a prototype GSR continued at NUST/EME
The project was started in 2006 and named "national Radar" or NR.

Over the years 3 versions were built and tested and in 2014 the Final prototype NR-V3 was accepted for production by Pakistan's Ministry of Defense production.

The Radar's Exact specifications are still undisclosed,but a learned guess is that the Radar has the capability of detecting Humans at 4Km range and Vehicles at 12Km range with an average accuracy of 96%.
The biggest challenge in any Ground surveillance radar is to identify target among clutter or reflections of trees,buildings and other ground objects. This was probably the biggest research project and many research papers were written by Pakistani PHD students on this subject during the project.
The final Algorithms was very robust and with accuracy of 96% or more.

All the components,including Antenna,transmitters,Receivers,Filters and software were designed,built and tested in Pakistan.
It is yet to be seen when the Radar will enter mass production and deployment on strategically important locations for area surveillance.

Some pictures of the project as below.

Antenna designs and prototypes.
 
NESCOM was given the task of further developing the AESA , PESA related research which branched out of this project. 300 Million USD were allocated for Pakistan's own dedicated Electronics R&D labs near Islamabad which had to be a subsidiary of NESCOM.
Unfortunately the labs never materialized in its desired form. Much of the funds dedicated for the lab were diverted to other civilian projects by PPP Prime minister Raja Pervez Ashraf.
A toned down NESCOM Electronics complex was completed in 2012,but was again a victim of financial corruption and could not do any mlre than manufacturing Motherboards for NRTC's Software defined radios.
My god with $300 million we could have revolutionized our electronic industry.

Allah garak karay PPP ko.

@HRK @DESERT FIGHTER
 
Purpose of This Article is to remove backwardness of some Folks,who think every thing in Pakistan is coming in crates and later assembled there.As engine is concerned several International firms are offering JV,but right know importing engine is cost effective as compared to JV because there is no program for bigger systems.Pakistan is manufacturing small drones from 1980's.NESCOM and local firms have exported hardware worth millions every year.
Pakistan Aeronautical Complex Kamra - Aircraft Manufacturing Factory
License production of Falco UAV and some sub-systems for TAI Anka
Albadeey Technologies - UAV, Target Drones, ground station, flying training
:..Welcome to [SATUMA]..:
Integrated Defence Systems - Wikipedia, the free encyclopedia
http://www.aerobot.ch/(JV with a local firm)
Aero-bot - Buy Uav Product on Alibaba.com
Introduction - :::... ID Aero Space ...:::
:: GIDS - Empowering the World ::
NESCOM
@Horus @Windjammer @Manticore @Major Shaitan Singh @levina @Zarvan @Pomegranate @syedali73 @Bornubus @Magnet @nair @SpArK
قناص
 
It's a long and interesting list, especially the Burraq UAV/missile combination. A number of middle eastern countries could use that capability these days.

Pakistan has consistently shamed India by rolling out programs that don't overreach, then executing and fielding useful equipment. The stories of the JF-17 vs. the Tejas, or Pakistan's tank development vs. Arjun iterations, make for very invidious comparisons.

The relevant question is how Pakistan wants to move forward. There's a growing global trend of non-aligned arms providers, who are beginning to roll out sophisticated weapons for export. Pakistan and India have potential offerings, as do Brazil, South Africa, South Korea, Turkey, and the UAE. I call the trend "Hyundaization", per my April 6th article in the Wall St. Journal.

(I can't post the URL - but anyone determined to find it can do so easily.)

The question for Pakistan, I think is how to wants to play in that environment. As a Chinese partner and conduit into OIC countries? As more of an independent player, perhaps in conjunction with Turkey and the UAE? Which areas are worthy of Pakistan's export focus? Why?
 
Chief of the Army staff testing the Azb DMR - deadly accurate up to 800m -

azb rifle.jpg


It's a long and interesting list, especially the Burraq UAV/missile combination. A number of middle eastern countries could use that capability these days.

Pakistan has consistently shamed India by rolling out programs that don't overreach, then executing and fielding useful equipment. The stories of the JF-17 vs. the Tejas, or Pakistan's tank development vs. Arjun iterations, make for very invidious comparisons.

The relevant question is how Pakistan wants to move forward. There's a growing global trend of non-aligned arms providers, who are beginning to roll out sophisticated weapons for export. Pakistan and India have potential offerings, as do Brazil, South Africa, South Korea, Turkey, and the UAE. I call the trend "Hyundaization", per my April 6th article in the Wall St. Journal.

(I can't post the URL - but anyone determined to find it can do so easily.)

The question for Pakistan, I think is how to wants to play in that environment. As a Chinese partner and conduit into OIC countries? As more of an independent player, perhaps in conjunction with Turkey and the UAE? Which areas are worthy of Pakistan's export focus? Why?

As far as i am concerned, Pakistan tends to play on its own. We have strong defense relations with countries in Central Asia, Balkins, Africa and MENA region. Somewhere down the line if any of the OIC states like to join in for a Joint Venture i.e an upgraded K-8 Trainer jet or Al-Khalid tanks etc they will be welcomed. We do have very strong cooperation with Turkey in various areas of defense technology i.e optronics, electronics and sub systems. Welcome aboard
 
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