Design of UWB Eight-port Comparator Based on Quasi-symmetry
Comparator is widely used in radar field.The operational principle of eight-port comparator is introduced first,and a new concept called port quasi-symmetry is proposed,and the theoretical analysis and demonstration are carried out.An overall design scheme of ultra-wideband eight-port comparator is proposed based on port quasi-symmetry,which makes the number of de-sign parameters decreases from plurality to one.It simplifies the design largely.An ultra-wideband eight-port comparator based on double-sided parallel-strip line is actually fabricated whose center frequency is 3 GHz.Over the measured results,the operating frequency range is from 1.5 GHz to 4.5 GHz(the return loss is less than-10 dB),the relative bandwidth is 100%,the phase er-ror is less than±4°.The measured results are consistent with the simulation results and theoretical analysis results,which verifies the correctness of the theory.
port quasi-symmetryeight-port comparatoroverall design schemeHFSS simulation
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