Abstract
A compact wideband dual-polarized antenna with enhanced upper out-of-band suppression is presented in this paper. The proposed antenna is an equivalent configuration of two electric dipoles and two magnetic dipoles using the crossed shunt loops. The incorporation of the electric and magnetic dipoles enables the antenna to achieve wide impedance bandwidth and a compact radiator size. In addition, four parasitic strips are inserted near the inner edge of the four loops to enhance the antenna upper out-of-band suppression at 3.5 GHz with improved impedance bandwidth. The antenna is fed by the crossed coaxial baluns with high isolation. A shorting sheet is introduced into the baluns to enhance the upper out-of-band suppression further and create another rejection at 4.9 GHz. To demonstrate the design method, the proposed antenna prototype was fabricated and measured. Measured results show that the proposed antenna has a wide impedance bandwidth of 1.625–3.05 GHz (61%) for ${S}_{11} dB with the isolation better than 38.3 dB. The upper out-of-band suppression of the antenna is also highly enhanced with measured ${S}_{11}>-2$ dB from 3.35 to 5.25 GHz. In addition, stable antenna gain and radiation patterns are achieved for base station applications.
Highlights
OWING to advantages of combating the multi-path fading effect and increasing the channel capacity to the wireless communication systems, dual-polarized antennas have received much popularity in different application scenarios, such as base stations, satellites, and radars systems
A novel dual-polarized antenna with electric and magnetic resonances is proposed with wide impedance bandwidth and compact radiator size
The equivalent electric dipoles and magnetic dipoles are developed by the crossed shunt loops, which make the proposed antenna achieve wider impedance bandwidth and more compact size
Summary
OWING to advantages of combating the multi-path fading effect and increasing the channel capacity to the wireless communication systems, dual-polarized antennas have received much popularity in different application scenarios, such as base stations, satellites, and radars systems. A novel dual-polarized antenna with electric and magnetic resonances is proposed with wide impedance bandwidth and compact radiator size. The equivalent electric dipoles and magnetic dipoles are developed by the crossed shunt loops, which make the proposed antenna achieve wider impedance bandwidth and more compact size. Four parasitic strips are introduced near the inner edge of the loops, which help to enlarge the antenna impedance bandwidth, and improve the antenna selectivity and produce the first suppression at 3.5 GHz. In addition, crossed coaxial baluns are used to feed the proposed antenna with the newly introduced shorting sheet, which is utilized to create the second suppression at 4.9 GHz. two radiation nulls are achieved at the center of two 5G base stations bands. Stable antenna gain and beamwidth are achieved for base station applications
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