Grating Lobe Reduction Using Tilted Beam Unit Cell in Series-Fed Patch Periodic Leaky-Wave Antennas

European Conference on Antennas and Propagation, pp. 1–5

Abstract

It is known that series-fed patch (SFP) periodic leaky-wave antennas (P-LWAs) suffer from the grating-lobe issue, which appears at the higher frequencies as the main beam scans towards the forward direction. Here, we propose a novel solution using beam tilting of the unit-cell radiation pattern to mitigate this issue. This solution is realized by modifying the unit-cell structure using parasitic monopoles placed close to the patch element in the H-plane, where the combined radiation pattern of the patch and the two monopoles results into a tilted beam in the E-plane direction. Finally, a design of a SFP P-LWA with monopoles at 6.1GHz to validate the proposed structure is presented and its results are discussed. The full-wave simulation shows a significant reduction of the grating lobes of the seven unit-cell array at higher frequencies, at which the grating lobes appear.

Authors 3

1. Wasim Alshrafi Aachen Institute of High Frequency Technology

   RWTH Aachen University

   Affiliation as printed

   Institute of High Frequency Technology, RWTH Aachen University, Aachen, Germany

2. Amar Al-Bassam Aachen Institute of High Frequency Technology

   RWTH Aachen University

   Affiliation as printed

   Institute of High Frequency Technology, RWTH Aachen University, Aachen, Germany

3. Dirk Heberling Aachen Institute of High Frequency Technology

   RWTH Aachen University · Fraunhofer Institute for High Frequency Physics and Radar Techniques

   Affiliation as printed

   Fraunhofer Institute for High Frequency Physics and Radar Techniques FHR, Wachtberg, Germany

   Institute of High Frequency Technology, RWTH Aachen University, Aachen, Germany