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A quarter-wave microstrip antenna for VHF communication systems has been fabricated and tested. The antenna is physically small, with a metallic ground plane. The antenna gain is +0.6 dBi, and the maximum H-plane cross-polarization levels are 10 dB below the maximum E-plane co-polarization levels. Measurements are performed in an anechoic antenna range designed for higher frequency testing (>1...
The RFID tag backscatter transfer power function is estimated from various measurement results in our anechoic chamber for two brands of tags. The backscatter transfer power function turns out to not be directly proportional to input power and therefore it cannot be modeled as a constant radar cross section. Additionally it shows that the classic radar equation cannot be applied directly under the...
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