scholarly journals Design of a Printed Dipole Antenna Array for a Passive Radar System

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Peter Knott
Keyword(s):  
Antenna Array ◽  
Moving Objects ◽  
Low Cost ◽  
Dipole Antenna ◽  
Target Object ◽  
Substrate Material ◽  
Radar System ◽  
Passive Radar ◽  
Preliminary Measurement ◽  
Area Of Interest

Passive radar (or Passive Coherent Localisation) is an advancing technology for covert operation. The signal transmitted from sources of opportunity such as radio or TV stations is used as illumination for a certain area of interest. Part of the transmitted signal is reflected by radar targets, for example, moving objects such as vehicles or aircraft. Typical radar parameters are derived from the comparison between the direct line-of-sight from the transmitter and the signal scattered from the target object. Such systems are an attractive addition to existing active radar stations because they have the potential to discover low-flying and low-observable targets and no active radar transmitter is required. Printed dipole antennas are very attractive antenna elements for such systems because of their easy fabrication, low-cost, polarisation purity, and low-profile properties. The present paper describes the design of an antenna array using printed dipole elements with flared arms for a passive radar system operating in the GSM900 frequency range. Isolated antenna elements and a small uniform linear antenna array were designed and optimised using computational electromagnetic methods. Several prototypes have been fabricated on conventional microwave PCB substrate material. Preliminary measurement results for antenna matching and far-field radiation patterns are shown.

Wave Arrival Direction Estimation Adaptive Antenna Array with Music Algorithms

2011 ◽  
Vol 179-180 ◽  
pp. 1342-1345
Author(s):  
Ping Chuan Zhang ◽  
Li Min Hou ◽  
Bu Yin Li
Keyword(s):  
Antenna Array ◽  
Research Field ◽  
Radar System ◽  
Adaptive Antenna ◽  
Passive Radar ◽  
Arrival Direction ◽  
Matlab Simulation ◽  
Adaptive Antenna Array ◽  
Direction Estimation ◽  
Wave Arrival

Passive radar based on GSM is a hot research field of new illuminators passive radars, and the wave arrival direction estimation is the key problem for detecting target. This paper designed adaptive antenna array for the GSM passive radar system, and give the complete Matlab simulation to verify the execution of the schedule, meanwhile, the result shows that the MUSIC algorithms is high accurate in the wave arrival direction compared with the Capon. All of this made a useful contribution to the research and application of the GSM-based passive radar.

scholarly journals Design of a Wearable, Low-Cost, Through-Wall Doppler Radar System

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Sam Agneessens ◽  
Patrick Van Torre ◽  
Frederick Declercq ◽  
Bart Spinnewyn ◽  
Gert-Jan Stockman ◽  
...  
Keyword(s):  
Moving Objects ◽  
Doppler Radar ◽  
Noise Figure ◽  
Low Cost ◽  
Axial Ratio ◽  
Low Complexity ◽  
Radar System ◽  
Indoor Environments ◽  
Textile Materials ◽  
Low Weight

A novel, low-cost, low-weight, wearable Doppler radar system composed of textile materials and capable of detecting moving objects behind a barrier is presented. The system operates at 2.35 GHz and is integrable into garments, making it well-suited for usage in difficult to access terrain, such as disaster areas or burning buildings. Wearability is maximized by relying on flexible, low-weight, and breathable materials to manufacture the key parts of the system. The low-complexity Doppler radar system makes use of an array of four textile-transmit antennas to scan the surroundings. The beam emitted by this array is right-hand circularly polarized along all scanning angles and provides a measured gain of 9.2 dBi. At the receiving end, textile materials are used to develop an active wearable receive antenna, with 15.7 dBi gain, 1.1 dB noise figure, left-hand circular polarization, and a 3 dB axial ratio beamwidth larger than 50°. Several measurement setups demonstrate that the onbody system is capable of detecting multiple moving subjects in indoor environments, including through-wall scenarios.

Low cost low loss waveguide-fed patch antenna array for automotive radar system

2015 ◽  
Author(s):  
Ahmed Abdellatif ◽  
Massoud Ghassemi ◽  
Mohammad-Reza Nezhad-Ahmadi ◽  
Safieddin Safavi-Naeini ◽  
Nasser Ghassemi
Keyword(s):  
Antenna Array ◽  
Patch Antenna ◽  
Low Cost ◽  
Radar System ◽  
Automotive Radar ◽  
Low Loss

Planar Dipole Antenna on Liquid Crystal Polymer Substrate at 2.4 GHz

2011 ◽  
Vol 181-182 ◽  
pp. 289-292
Author(s):  
B.T.P. Madhav ◽  
V.G.K.M. Pisipati ◽  
D. Madhavi Latha ◽  
P.V. Datta Prasad
Keyword(s):  
Liquid Crystal ◽  
Low Cost ◽  
Dielectric Materials ◽  
Dipole Antenna ◽  
Substrate Material ◽  
Liquid Crystal Polymer ◽  
Liquid Crystal Polymers ◽  
Patch Antennas ◽  
Crystal Polymer ◽  
Proposed Model

Liquid crystal polymers are the low cost, flexible structured and low weight substrate materials for making antennas. Liquid crystal polymers are excellent dielectric materials having good electrical, mechanical properties which suites in the application of microstrip patch antennas. In this paper liquid crystal polymer with dielectric constant 3.16 is used as substrate material for planar dipole antenna designed to operate at 2.4 GHz. Ansoft-HFSS software is used to simulate the proposed model and obtained the return loss, input impedance, 3D-gain, 2D-gain total, radiation patterns in E and H planes, E-field and H-field distribution results.

scholarly journals Deteksi Radar Pasif menggunakan GNU Radio dan SDR pada Frekuensi Televisi

2020 ◽  
Vol 8 (3) ◽  
pp. 505
Author(s):  
YONATAN EDWIN MARPAUNG ◽  
ALOYSIUS ADYA PRAMUDITA ◽  
ERFANSYAH ALI
Keyword(s):  
Software Defined Radio ◽  
Cross Correlation ◽  
Moving Objects ◽  
Radar System ◽  
Digital Television ◽  
Passive Radar ◽  
Gnu Radio ◽  
Delay Test ◽  
Radar Systems ◽  
Television Receiver

ABSTRAKRadar pasif adalah salah satu jenis sistem radar bistatic dimana transmitter dan receiver berada di tempat berbeda. Sistem radar pasif dapat memaanfaatkan frekuensi siaran televisi yang tersedia sebagai sumber transmitter. Pada penelitian ini, radar pasif dibuat dengan Sofware Defined Radio (SDR) sebagai sistem komunikasi yang dapat mengkofigurasi penerima televisi digital sdr-dongle RTL2832U yang dimodifikasi dan perangkat lunak GNU Radio. Hasil pengujian delay pada gelombang 1,2,3 untuk objek manusia adalah 0,192, 0,36 dan 0,53 detik, untuk objek sepeda adalah 0,332, 0,5 dan 0,67, untuk objek motor adalah 0,422, 0,69 dan 0,86 detik, untuk objek mobil adalah 0,538, 0,7 dan 0,87 detik sehingga dapat disimpulkan bahwa sistem radar pasif yang dirancang dapat mendeteksi benda bergerak dimana pegerakan target menyebabkan pergeseran puncak Cross-Correlation.Kata kunci: Radar Pasif, Cross-Correlation, SDR, Frekuensi Televisi, RTL2832U ABSTRACTPassive radar is a type of bistatic radar system where the transmitter and receiver are in different places. Passive radar systems can utilize the available television broadcast frequencies as transmitter sources. In this study, passive radar is made with Software Defined Radio (SDR) as a communication system that can configure a modified RTL2832U sdr-dongle digital television receiver and GNU Radio software. The delay test results on waves 1,2,3 for human objects are 0.192, 0.36 and 0.53 seconds, for bicycle objects are 0.332, 0.5 and 0.67, for motor objects are 0.422, 0.69 and 0.86 seconds, for car objects are 0.538, 0.7 and 0.87 seconds so it can be concluded that the passive radar system is designed to detect moving objects where moving targets causes a shift in the peak of Cross-Correlation.Keywords: Passive Radar, Cross-Correlation, SDR, Television Frequency, RTL2832U

A Fast Cancellation Algorithm for DTTB-based Passive Radar System

2014 ◽  
Vol 35 (1) ◽  
pp. 36-40 ◽  
Author(s):  
Ge-ge Zhang ◽  
Jun Wang ◽  
Yu-chun Liu
Keyword(s):  
Radar System ◽  
Passive Radar

Enhanced cross-polarization isolation of loop-dipole antenna array backed by dielectric cavities for 5G base stations

2021 ◽  
pp. 1-17
Author(s):  
Yiran Da ◽  
Xiaoming Chen ◽  
Mengting Li ◽  
Zhenyuan Zhang ◽  
Azremi Abdullah Al-Hadi ◽  
...  
Keyword(s):  
Antenna Array ◽  
Dipole Antenna ◽  
Base Stations ◽  
Cross Polarization

scholarly journals A Novel Electrically Small Ground-Penetrating Radar Patch Antenna with a Parasitic Ring for Respiration Detection

Sensors ◽  
2021 ◽  
Vol 21 (6) ◽  
pp. 1930
Author(s):  
Di Shi ◽  
Taimur Aftab ◽  
Gunnar Gidion ◽  
Fatma Sayed ◽  
Leonhard M. Reindl
Keyword(s):  
Ground Penetrating Radar ◽  
Patch Antenna ◽  
Low Cost ◽  
Substrate Material ◽  
Geometric Parameters ◽  
Gas Explosions ◽  
Aerial Vehicle ◽  
Electromagnetic Characteristics ◽  
Ground Penetrating ◽  
Quick Search

An electrically small patch antenna with a low-cost high-permittivity ceramic substrate material for use in a ground-penetrating radar is proposed in this work. The antenna is based on a commercial ceramic 915 MHz patch antenna with a size of 25 × 25 × 4 mm3 and a weight of 12.9 g. The influences of the main geometric parameters on the antenna’s electromagnetic characteristics were comprehensively studied. Three bandwidth improvement techniques were sequentially applied to optimize the antenna: tuning the key geometric parameters, adding cuts on the edges, and adding parasitic radiators. The designed antenna operates at around 1.3 GHz and has more than 40 MHz continuous −3 dB bandwidth. In comparison to the original antenna, the −3 and −6 dB fractional bandwidth is improved by 1.8 times and 4 times, respectively. Two antennas of the proposed design together with a customized radar were installed on an unmanned aerial vehicle (UAV) for a quick search for survivors after earthquakes or gas explosions without exposing the rescue staff to the uncertain dangers of moving on the debris.

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