Design of balanced band‐notched UWB filtering high‐gain slot antenna

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...

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Bibliographic Details
Published in:Microwave and optical technology letters 2018-03, Vol.60 (3), p.615-620
Main Authors: Lee, Ching‐Her, Ho, Pei‐Shan, Hsu, Chung‐I G., Chen, Hsun‐Hsiang
Format: Article
Language:English
Subjects:
Antennas
balanced UWB filter
Bandpass filters
Broadband
common‐mode suppression
filtering antenna
High gain
Local area networks
notch band
Product design
Radiators
Resonators
T shape
Ultrawideband
Wireless networks
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Summary: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.
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.31017