Design of a Shielded Antenna System for Ground Penetrating Radar Applications
Chen Guo, Richard C.Liu
IEEE Antennas and Propagation Society International Symposium, 2009. APSURSI '09.
1 - 4
Ground-penetrating radar (GPR) techniques are being used increasingly for detection and identification of buried targets and structures . Ideally the transmitted signal being applied in UWB GPR system supposed to be a pulse which is as narrow as possible. In practice, the transmitted impulse waveform is generally a Gaussian shaped and has broadband characteristics in frequency, which may vary from 100 MHz to 5 GHz depending on the applications . Therefore, UWB transmitter and receiver antennas need to be designed to radiate a GPR impulse-signal that is uniformly shaped into the ground and receive pulses scattered from subsurface objects with acceptable efficiency. The antennas must have flat and high directivity gain, narrow beam, and low side-lobe and input-reflection levels over the operational frequency band in order to reach the maximum dynamic range, best focused illumination area, lowest T/R antenna coupling, reduced ringing, and uniformly shaped impulse radiation [3,4]. Considering factors such as instantaneous bandwidth, waveform fidelity, radiation efficiency and convenient manufacturing, bow-tie antenna is often selected for ground-coupled GPR applications.
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