Wide band ridge gap waveguide (RGW) fan beam antenna with low side lobes based on parabolic reflector principle

Abstract

In this paper, a wide band ridge gap waveguide (RGW) fan beam antenna with low side lobe level (SLL) is presented making use of parabolic offset reflector concept in antenna geometry. In the proposed topology, in contrast to TEM based RGW horn, the amplitude distribution across the antenna aperture can be easily controlled. Furthermore, thanks to intrinsic feature of parabolic reflector in generating plane wave front, the phase distribution uniformity across the proposed antenna aperture is better than that of the RGW horn. These two facts allow the proposed topology to provide lower SLL compared to the RGW horn. A prototype of the proposed structure is designed and fabricated. Simulation and measurement results also show that wider operating bandwidth compared to the RGW horn can also be achieved using this topology. For the designed sample, the impedance bandwidth of 41% with −20 dB ≤ SLL ≤ − 15 dB and gain of 11.8–15.5 dBi is achieved. Results show that the proposed topology can be a good candidate for realization of high gain wide band RGW fan beam antennas with low SLL.

Development of a wideband symmetric pillbox antenna with low side lobes in gap waveguide technology

“…Furthermore, the antenna in this work presents the highest gain with lowest occupied area; however, it introduces higher SLL than the works presented in Refs. [13,23].…”

“…The GW has three major types including ridge gap waveguide (RGW), groove gap waveguide (GGW), and microstrip gap waveguide (MGW). Different types of antennas such as high-gain and low sidelobe level slot arrays [20][21][22] and fan-beam antennas using an H-plane horn and 2D reflector concepts [23][24][25] have been implemented using this new technology. In Ref.…”

A flat aperture antenna composed of a series fed H‐plane horn array excited by a ridge gap waveguide horn

“…The air gap thickness g should be kept lower than quarter wavelength ( λ /4), the pin’s height h should be chosen around λ /4 and the pin’s period p has to be chosen smaller than λ /2 by keeping the a / p ratio less than one. In this study, the pin’s dimensions and the air gap thickness are selected similar to those applied in [23] to provide a stop band over 10–20 GHz covering the desired operating band (i.e. the Ku band).…”

H‐plane horn antenna with very low side lobes using partially dielectric‐filled gap waveguide technology

“…Different H-plane antennae with fan beam radiation have been designed and implemented using GW technology [20][21][22][23][24][25][26]. In Ref.…”

“…The concept of a 2D offset reflector is applied in Ref. [24] to introduce an H-plane fan beam antenna using the RGW technique and 33% bandwidth (12.4-17.5 GHz) with −20 < SLL ≤ 15 dB is reported. In Ref.…”