Abstract
Effects of lossless cavity-backing on time-domain performance of a two-arm combined equiangular/power spiral antenna are discussed. The impact of cavity depth is studied and guidelines for achieving low pulse distortion are established. The resistive arms' termination is found to be necessary to achieve a compromise between good time and frequency performances at the expense of efficiency at low frequencies. Developed antenna with diameter to depth ratio of 8:1 has wide-angle fidelity factor of 90% while maintaining VSWR 5 dBic, and axial ratio <2.2 dB. Presented results show that the proposed antenna is viable candidate for many applications including pulsed and continuous-wave through-wall imaging, electronic attack/support measures, and ground penetrating radar. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:677–681, 2015
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