Periodic Ridged Leaky-Wave Antenna Design Based on SIW Technology

TL;DR

This paper introduces a novel periodic ridged leaky-wave antenna based on SIW technology, featuring a sinusoidal ridge to control leakage and reduce cross polarization, with promising measurement results aligning with simulations.

Contribution

It presents a new design of a ridged SIW leaky-wave antenna with controllable leakage and sidelobe levels, improving polarization and bandwidth performance.

Findings

Achieved sidelobe levels below 30 dB.

Demonstrated controllable leakage rate via ridge parameters.

Measurement results agree with simulations.

Abstract

A periodic long slot leaky-wave antenna (LWA) based on a ridged substrate integrated waveguide (RSIW) is proposed. To reduce the cross polarization, the long slot is placed on the SIW centerline, and a sinusoidal ridge is used to produce a controllable asymmetric electric field around the long slot. Also, only a small stopband occurs when the beam is scanned through the broadside. Varying the amplitude and width of the sinusoidal ridge provides a fixed phase constant and controllable leakage rate to achieve the desired sidelobe level of less than 30 dB. Measurement results are consistent with the simulation results.