scholarly journals Design of a Directional Microstrip Antenna at UHF-Band for Passive Radar Application

2018 ◽  
Vol 384 ◽  
pp. 012006 ◽  
Author(s):  
D L N Fauzi ◽  
T Hariyadi
Keyword(s):  
Microstrip Antenna ◽  
Passive Radar ◽  
Uhf Band

scholarly journals A RHCP Microstrip Antenna with Ultrawide Beamwidth for UHF Band Application

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Yuan-zhu Liu ◽  
Shao-qiu Xiao ◽  
Bing-zhong Wang
Keyword(s):  
Rectangular Plate ◽  
Microstrip Antenna ◽  
Ground Plane ◽  
Ground Structure ◽  
Circularly Polarized ◽  
Right Hand ◽  
Truncated Cone ◽  
Half Angle ◽  
Good Agreement ◽  
Uhf Band

A novel right-hand circularly polarized (RHCP) UHF microstrip antenna with 3 dB beamwidth of more than 150° is presented in this paper. The 3 dB RHCP beamwidth can be broadened by utilizing a combined ground structure with a hollow truncated cone ground plane and a metallic rectangular plate. Optimizing the half-angleθcof cone and the cone heighthcone, a 3 dB RHCP beamwidth of more than 200° can be acquired, which is about 120° greater than its corresponding regular RHCP microstrip antenna. There is a good agreement between the measured results and simulated results for the proposed antenna operating in UHF band.

scholarly journals A Three-Stage Inter-Channel Calibration Approach for Passive Radar on Moving Platforms Exploiting the Minimum Variance Power Spectrum

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 69
Author(s):  
Philipp Wojaczek ◽  
Diego Cristallini ◽  
Daniel W. O’Hagan ◽  
Fabiola Colone ◽  
Giovanni Paolo Blasone ◽  
...  
Keyword(s):  
Power Spectrum ◽  
High Frequency ◽  
Minimum Variance ◽  
Passive Radar ◽  
Clutter Suppression ◽  
Very High Frequency ◽  
Moving Platforms ◽  
Adaptive Calibration ◽  
Data Adaptive ◽  
Uhf Band

Research in passive radar has moved its focus towards passive radar on moving platforms in recent years with the purpose of moving target indication and ground imaging via synthetic aperture radar. This is also fostered by the progress in hardware miniaturization, which alleviates the installation of the required hardware on moving platforms. Terrestrial transmitters, commonly known as illuminators of opportunity in the passive radar community, usually emit the signals in the Very High Frequency (VHF) or Ultra High Frequency (UHF) band. Due to the long wavelengths of the VHF/UHF band, there are constraints on the size of the used antenna elements, and therefore, the number of antenna elements to be employed is limited, especially as the platform carrying the passive radar system is intended to be small, potentially even an unmanned aerial vehicle. In order to detect moving targets hidden by Doppler shifted clutter returns, one common approach is to suppress the clutter returns by applying clutter suppression techniques that rely on spatial and temporal degrees of freedom, such as Displaced Phase Center Antenna (DPCA) or Space-Time Adaptive Processing. It has been shown that the DPCA approach is a meaningful technique to suppress the clutter if two antenna elements are employed. However, if the employed receiving channels are not carefully calibrated, the clutter suppression is shown to be not effective. Here, we suggest a three-stage calibration technique in order to perform the calibration of two receiving channels, which involves the exploitation of the direct signal, a data-adaptive amplitude calibration, and finally, a data-adaptive calibration of phase mismatches between both receiving channels by the estimation of the Minimum Variance Power Spectrum of the clutter. The validity of the proposed approach is shown with simulated data and demonstrated on real data from a fast ground moving platform, showing improved clutter cancellation capabilities.

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