Differentially Fed, Dual-Band Dual-Polarized Filtering Antenna With High Selectivity for 5G Sub-6 GHz Base Station Applications

In this communication, a novel dual-band dual-polarized filtering antenna with high selectivity is proposed. By etching four slots at each side of a square radiating patch, dual operation bands as well as a natural radiation null between the two bands are observed. Another two radiation nulls are ge...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation Vol. 68; no. 4; pp. 3231 - 3236
Main Authors: Li, Yapeng, Zhao, Zhipeng, Tang, Zhaoyang, Yin, Yingzeng
Format: Journal Article
Language:English
Published: New York IEEE 01.04.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
5G mobile communication
Antenna arrays
Antenna feeds
Antennas
Bandpass filters
Base station antenna
Circuits
differentially fed
Dual band
Dual polarization (waves)
dual-polarized antenna
filtering antenna
high selectivity
Microstrip transmission lines
Resonant frequency
Selectivity
Slot antennas
ISSN:0018-926X, 1558-2221
Online Access:Get full text
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Summary:In this communication, a novel dual-band dual-polarized filtering antenna with high selectivity is proposed. By etching four slots at each side of a square radiating patch, dual operation bands as well as a natural radiation null between the two bands are observed. Another two radiation nulls are generated by introducing a novel feeding structure, which is composed of a microstrip line with open-circuit stepped-impedance resonators (OCSIRs). Thus, a dual-band bandpass filtering response of the realized gain is obtained. Each polarization of the antenna is differentially fed, and the differential port isolation is better than 37 dB. A prototype of the antenna element and a <inline-formula> <tex-math notation="LaTeX">1\times 4 </tex-math></inline-formula> array is fabricated and tested to validate our design. Measured results show that the antenna element has dual operation bands of 3.28-3.71 and 4.8-5.18 GHz for VSWR < 1.5. Besides, a high out-of-band gain-suppression level which reaches 17.7 dB is also obtained. Good performance of the proposed antenna makes it a promising candidate for 5G sub-6 GHz base station systems.
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ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2019.2957720