Design of a compact printed lowpass filtering antenna with wideband harmonic suppression for automotive communication

摘要

This article presents a printed planar lowpass filtering monopole antenna withwide stopband for automotive communications. This monopole radiatorexhibits hybrid geometry and is constructed using a circular slot and corneredged slot. The fundamental radiator's ground plane is defected to enhance theVSWR bandwidth and four rectangular patches with two open-circuit stubs isbeing used to construct a lowpass filter with wide stopband. The filtering characteristicsare further improved by incorporating circular complementary splitringresonator (CCSRR) on the ground plane. The proposed lowpass filteringantenna is obtained by integrating the lowpass filter with a super wideband(SWB) monopole antenna and experimentally validated with the measuredreflection coefficient as <−10 dB in 0.67 to 4.15 GHz (69.25%). In this operatingspectrum, the radiation pattern characteristics of the filtering antenna isidentically stable and the passband average gain is >4.45 dBi. Further, the prototypefiltering antenna bandwidth and radiation characteristics are analyzedin housing effects. The filtering antenna can be conveniently printed alongwith the existing printed circuit board or it can be located inside the shark finhousing thereby eliminating the need for a dedicated location in vehicularcommunications.