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2023-12-16
Design and Analysis of Wideband Cross Dipole Antenna with Bent Arms for Base Station Applications
By
Progress In Electromagnetics Research C, Vol. 139, 119-127, 2024
Abstract
This paper presents a wideband dual slant polarized cross dipole antenna used to serve 2G/3G/4G/5G frequency bands. The proposed antenna model consists of two linearly polarized bent cross-dipole antennas, a cross-shaped director, and a metal reflector with walls in an open box manner. Bent dipole arms are etched on PCB to make the element compact. These cross dipoles are fed by hook-shaped wideband baluns. A cross director was placed on top of the cross dipole structure to achieve wideband impedance matching. The linearly polarized dipoles are placed orthogonally to achieve ±45° slant polarization. Two orthogonal polarizations were realized by exciting two input ports separately. A prototype has been fabricated, and measurements are carried out to validate the antenna performance. The measured results show that the antenna is well matched over the wide bandwidth, and the impedance bandwidth is ranging from 617 MHz to 990 MHz for VSWR<2, which is about 48%. The measured isolation between two orthogonal ports of the antenna was observed to be better than 33 dB. The radiation characteristics of the proposed model were stable, and the realized gain is in the range of 8.1±0.5 dBi. The values of the cross-polarization discrimination (XPD) are better than 20 dB at the boresight and 8 dB within ±60° directions. The proposed antenna model has advantages like wide impedance bandwidth, wide pattern bandwidth, stable radiation performance, simple structure, and a small overall size of 350 mm × 350 mm × 100 mm.
Citation
Lakshminarayana Pollayi, and Dasari Rama Krishna, "Design and Analysis of Wideband Cross Dipole Antenna with Bent Arms for Base Station Applications," Progress In Electromagnetics Research C, Vol. 139, 119-127, 2024.
doi:10.2528/PIERC23061104
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