A Differential-Fed Dual-Polarized High-Gain Filtering Antenna Based on SIW Technology for 5G Applications

Abstract

A new differential-fed wideband dual-polarized microstrip filtering antenna exhibiting high gain, and high common-mode rejection is presented in this paper. The presented antenna is composed of a square patch radiator mounted on a substrate integrated waveguide (SIW) cavity. The structure is excited by two differential pairs of feeding probes providing differentially exciting signals. The filtering response is achieved by introducing symmetrical defected ground structures (DGS) in the ground layer surrounding the four excitation ports for dual-polarized antenna. The DGS is optimized to introduce nulls at the high and low edges of the passband transmission maintaining high gain and wide bandwidth. Because of the symmetric geometry of the proposed antenna, the design is studied and analyzed in one polarization mode, while the performance for the second mode will be identical. The filtering antenna is simulated and optimized using finite element solver software (CST & HFSS). Good performance is obtained with wide bandwidth of 11%, realized gain of 8 dBi at the resonant frequency (3.5 GHz) and low crosspolarization level due to the differentially driven ports, and complete symmetry using SIW technology. Also, the antenna has a single layer substrate with a height of 0.035 of the free space wavelength and operating at the sub-6 GHz 5G spectrum.

Design of a Wide-Band Microstrip Filtering Antenna with Modified Shaped Slots and SIR Structure

“…This integration changes the structure of the circuit, improves the performance of the circuit and simplifies the connection among various components. Unlike many microstrip filtering antenna proposed in the literature [35][36][37][38][39][40][41][42][43][44], the design proposed here is better than others with respect to the structure size, design complexity, gain, bandwidth and the reflection coefficient characteristics. Also, this paper presents a compact second-order filtering antenna utilizing SIR and modified shaped slots on the monopole patch antenna.…”

A Design of UWB Band-Pass Filter with Variable Dual Notched Bands Using EBG Structure

“…According to the obtained S21/S11 results for different values of L it is clear when the size of L2 increases from 2.5 to 4.5 mm, the first notch frequency can be easily decreased from 5 to 4 GHz and the second notch tunes from 8 to 6 GHz. According to the obtained results, we can conclude the notch frequencies can be easily tuned and modified to avoid the interferences from various wireless systems with operation frequency within the UWB spectrum [38][39][40].…”

Trisection Open-Loop Varacter-Based Tunable Filter for 5G Wireless Communications

“…"Radio frequency noise is an increasingly serious issue in modern wireless communication applications such as 5G and wide-band radar systems [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Microstrip band-pass filters are generally used to filter noise signals and unwanted frequencies in wireless communication applications [19], particularly in radio frequencies and microwave communications due to their effective rejection of spurious frequencies.…”