Open AccessElectrically small, planar, wideband filtering antenna with dual ring patches
Author(s) -
Tang MingChun,
Li Chaofang,
Chen Yingjie
Publication year - 2020
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2019.2633
Subject(s) - wideband , planar , antenna (radio) , dual (grammatical number) , ring (chemistry) , acoustics , electronic engineering , physics , telecommunications , optics , computer science , engineering , art , computer graphics (images) , chemistry , literature , organic chemistry
A simple, planar, electrically small antenna with both wide bandwidth and good out‐of‐band filtering selectivity is presented. The proposed filtering antenna is mainly composed of a small driven patch and a slotted ground plane. Two slots are etched in the ground plane to form two square ring patches that can generate a new resonant mode and two radiation zeros, and a T‐shaped stub is loaded not only to enhance the impedance bandwidth but also to increase the out‐of‐band rejection level. A prototype is fabricated and measured. The measured −10 dB fractional impedance bandwidth is 23.05% (2.61–3.29 GHz) centred at 2.95 GHz with the realised gain values 2.95 ± 0.34 dBi in the operational band, with two radiation zeros located at 2.27 and 3.62 GHz, respectively, even with electrically small size ka = 0.98. The experimental results are in good agreement with the simulated values.