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

Abstract

This article presents a printed planar lowpass filtering monopole antenna with wide stopband for automotive communications. This monopole radiator exhibits hybrid geometry and is constructed using a circular slot and corner edged slot. The fundamental radiator's ground plane is defected to enhance the VSWR bandwidth and four rectangular patches with two open-circuit stubs is being used to construct a lowpass filter with wide stopband. The filtering characteristics are further improved by incorporating circular complementary splitring resonator (CCSRR) on the ground plane. The proposed lowpass filtering antenna is obtained by integrating the lowpass filter with a super wideband (SWB) monopole antenna and experimentally validated with the measured reflection coefficient as <−10 dB in 0.67 to 4.15 GHz (69.25%). In this operating spectrum, the radiation pattern characteristics of the filtering antenna is identically stable and the passband average gain is >4.45 dBi. Further, the prototype filtering antenna bandwidth and radiation characteristics are analyzed in housing effects. The filtering antenna can be conveniently printed along with the existing printed circuit board or it can be located inside the shark fin housing thereby eliminating the need for a dedicated location in vehicular communications.

Quad-Port Multiservice Diversity Antenna for Automotive Applications

“…The reliability of the antenna in the automotive environment is investigated, taking into account the housing effects [37]. The roof of the car is represented by a metal plate.…”

A novel asymmetrical interdigital coupled line‐based penta‐band bandpass filter design with enhanced selectivity employing square complementary split ring resonator

“…However, the selectivity of these filters is not impressive enough as the number of TZs are restricted. A quad‐band BPF possessing 10 transmission zeros (TZs) is reported in Reference 10 using stepped impedance resonators (SIRs) structured by folded high‐impedance strip lines. However, the second and the third passband's shape profiles are not sharp enough owing to lack of control over bandwidths and TZs.…”

A 2.45 GHz FSS Loaded Rectifying Antenna

“…Many techniques have been introduced for suppression of spurious bands, such as, use of defected ground structure (DGS) [3], photonic band-gap (PBG) [4], combined DGS and PBG structures [5], ground slots [6], stubs at the feed line [7], compact microstrip resonant cell [8], printed lowpass ltering antenna [9] and right angle slits embedded in the antenna [10] etc. For improvement of gain arti cial magnetic conductor (AMC) [11] and frequency selective surfaces (FSS) have been used [12]- [14].…”