Design of a Low-SLL SIW Slot Array Antenna With a Large Declination in $Ka$ -Band

Chengwei Zhao,Xiaoping Li,Chao Sun,Yanming Liu,He Huang

doi:10.1109/access.2019.2933585

Chengwei Zhao, Xiaoping Li + Show 3 more

Open Access

https://doi.org/10.1109/access.2019.2933585

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Journal: IEEE Access	Publication Date: Jan 1, 2019
Citations: 5	License type: CC BY 4.0

Affiliation: Xidian University

Abstract

A small-size large-declination longitudinal slot array antenna based on substrate integrated waveguide (SIW) technology was proposed. Compared with the conventional SIW slot array, the proposed antenna achieves a larger declination and a lower SLL. The antenna is mainly composed of three parts, a dielectric substrate, a coaxial port, and a matched load. The antenna contains 13 radiation slots, and the adjacent slot spacing is greater than half of the waveguide wavelength, so the main beam is biased towards the load. To achieve low sidelobe levels (SLL), the amplitude distribution of the 13 slots is based on Taylor synthesis of SLL = -25 dB. The antenna was processed and measured. From the measured results, the antenna achieved a beam declination of 26° and a SLL below -20 dB from 35.2 to 35.8 GHz. With the same number of slots, the length of the slot array of the SIW structure is only 44.8% of the length of the standard metal hollow waveguide. Based on the performance achieved, the SIW slot antenna is an excellent candidate for carrier conformal and large declination applications.

Highlights

INTRODUCTIONThe antenna is required to conform to the external surface
In projectile communication, the antenna is required to conform to the external surface
In the standing-wave arrays, the adjacent slot spacing is λg/2, and the waveguide is shorted at λg/4 after the last slot, where λg is the wavelength in the waveguide

Summary

INTRODUCTION

The antenna is required to conform to the external surface. When the slot spacing is less than λg/2, the beam is biased toward the feeding port, and when the spacing is greater than λg/2, the beam is biased toward the load end The advantages of this configuration are as follows: a) the main beam declination can be achieved, b) the pattern is easy to control, c) a wider impedance and SLL bandwidth compared to standing-wave arrays, a few power is dissipated by the load. In [21], the Method of Least Squares (MLS) was used to develop an optimum design procedure for the traveling-wave SIW slot array antenna. Xu et al [22] showed a 16×16 SIW longitudinal slot array antenna by performing full-wave electromagnetic simulation method. A small-sized, low-SLL large-declination longitudinal slot array with a SIW structure is proposed.

ANTENNA DESIGN

SLOT ANTENNA DESIGN

CONCLUSION