High Isolation Dual-Polarized Patch Antenna with Hybrid Ring Feeding

Abstract

This paper presents a hybrid ring feeding dual-polarized patch antenna with high isolation in a wide working band. The proposed antenna consists of a circular radiating patch printed on the upper horizontal substrate, two pairs of Γ shaped strips printed on two vertical substrates, and a hybrid ring feeding network printed on the lower two horizontal substrates. The proposed antenna adopts Γ shape strips coupled feeding structure to achieve a wide operating band. Furthermore, a hybrid ring feeding structure with high isolation in a wide bandwidth, which is firstly proposed, is applied as feeding network. When one port is excited, the feeding network can realize twice the power cancellation. Thus, high ports isolation characteristics can be obtained. A prototype of the proposed antenna is fabricated and measured. Measured results show that the 10 dB reflection coefficient bandwidths of the two ports are both about 38.7%, with port isolation higher than 40 dB through most of the band, and the cross-polarizations are below −24 dB.

Meta-Surface Wall Suppression of Mutual Coupling Between Microstrip Patch Antenna Arrays for THZ-Band Applications

“…This is because on a finite ground-plane the surface waves are reflected and diffracted at the edges of the substrate, which results in a significant amount of energy loss [4,5]. To date numerous techniques have been explored to improve the radiation performance of patch antennas implemented on substrates [6][7][8]. This includes incorporating photonic bandgap (PBG) or electromagnetic bandgap (EBG) structures around the radiating elements [9][10][11][12].…”

Miniaturized microstrip patch antenna with high inter‐port isolation for full duplex communication system

“…Recently in numerous works, different methods have been proposed in order to increase isolation between antenna ports. [27][28][29][30][31][32][33][34][35][36] In proposed antenna in Reference 31, by placing transmitter and receiver ports on width and length of a simple patch and external feed forward loop, isolation about 40 dB in 24 MHz bandwidth has been achieved. Also dimension of this antenna is 134 mm  134 mm.…”

Broadband Dual-Polarized Multidipole Antenna for Base Station Applications

“…Huang et al [7] proposed the ME dipole antenna with C-shaped stubs to filter the unwanted frequency band, which has a bandwidth of 52.6% for VSWR < 1.5 and a port-to-port isolation higher than 25.4 dB. Moreover, by using balun structure [8][9][10] and adding parasitic elements (such as folded metallic plate [11], loop ring [1,12], and fan-shaped parasitic patches [13]), the bandwidth can be effectively increased. However, the proposed crossed-dipoles antennas mostly suffer from large dimension complicated structure and a narrow impedance bandwidth that are still less than 55 %.…”