Premium
Design of balanced band‐notched UWB filtering high‐gain slot antenna
Author(s) -
Lee ChingHer,
Ho PeiShan,
Hsu ChungI G.,
Chen HsunHsiang
Publication year - 2018
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31017
Subject(s) - return loss , resonator , passband , slot antenna , antenna (radio) , physics , band rejection , band pass filter , acoustics , electrical impedance , microstrip , ultra wideband , optics , electrical engineering , microstrip antenna , engineering
A balanced band‐notched ultra‐wideband (UWB) filtering slot antenna with high gain is proposed in this article. The high gain is achieved by deploying two identical open‐ended T‐shaped slot radiators in a back‐to‐back fashion. These two slot radiators are fed by differential‐mode (DM) signals output from a balanced band‐notched UWB bandpass filter (BPF) constructed using a stepped‐impedance one‐wavelength (1λ) slotline resonator. The DM notched band for blocking the 5‐GHz WLAN band signals is generated by symmetrically placing a pair of microstrip resonators and a pair of slotline resonators, both being half‐wavelength long, on the two sides of the 1λ slotline resonator. Measured and simulated DM return loss responses agree quite well. The common‐mode (CM) response is excellent with a measured CM return loss of below 0.54 dB in 1‐12 GHz. As compared with its single‐ported standalone slot antenna counterpart, the proposed balanced filtering slot antenna exhibits 2‐dB‐higher measured peak realized gains at, if not all, most frequencies in the notch‐band‐excluded passband.