Multibeam SIW Leaky-Wave Antenna with Beam Scanning Capability in Two Dimensions

Abstract

This paper presents a 2D multibeam antenna (2D-MBA) for two-dimensional scanning of space with fully passive elements using the substrate integrated waveguide (SIW) leaky-wave antenna (LWA) and Rotman lens for telecommunication applications. An LWA structure with 19 slot elements based on SIW in the frequency range of 14.5–22.5 GHz was designed to scan theta angles from −60 to +35 degrees, and a wideband Rotman lens was designed with five inputs, five outputs, and eight dummy ports to scan phi angles from −30 to +30 degrees. Finally, for two-dimensional space scanning, a five-element SIW LWA array was combined with a Rotman lens, and the whole structure was simulated and implemented in full-wave CST software. By optimizing the structure, the return losses of the input ports were below −10 dB, and the maximum measured gain was 20.3 dBi.

A W‐band long‐slot array antenna with two‐dimensional beam‐scanning capability

“…For example, an array of Substrate-integrated waveguide (SIW) LWA fed by a Butler matrix [11], the Butler matrix could introduce beam switching in the second dimension, but bring complexity and insertion loss as well, especially in higher frequencies. Rotman lens and metal grating lens could also be used as the feeding network for SIW LWA array [12,13], but their large size and high loss makes them less attractive for W-band applications. A rotable feeding structure could easily make 2-D scanning as well, but with a complex structure [14].…”