A new leaky wave antenna using wire‐loaded metagratings: The theoretical analysis and implementation

Abstract

Summary A new leaky wave antenna (LWA) based on wire‐loaded metagratings (MGs) is proposed, with the capability of successfully employing MGs for leaky modes. Periodic capacitive‐wired and inductive‐wired MGs are located on a dielectric substrate in the LWA framework and backed by a perfect electric conductor (PEC) layer. These MGs are partial radial surfaces to radiate energy using equivalent surface impedance with a local value of the complex wavenumber. A theoretical analysis has created a model for the equivalent electromagnetic fields produced via loaded‐wire MGs and generated the Z‐matrix and S‐matrix for a two‐port structure from the electromagnetic fields. As a result, a beam‐scanning range of 53° for the operating bandwidth of 9.9–11.9 GHz is achieved with a scanning sensitivity of 26.5°/GHz. Meanwhile, the realized gain is obtained up to 12.9 dB. The measurement and simulation results indicated that the MGs LWA was consistent. The proposed antenna performed admirably in beam‐steering communication systems.

A slotted metagratings leaky-wave antenna with theoretical analysis

“…In [52] proposed a (185 × 12 × 1.524 mm total size) longitudinally slotted SIW-LWA for millimeter-wave applications to achieve 95% radiated efficiency while obtaining a 26°scanning range with 33-37 GHz bandwidth and 14.1∼15.3 dBi gain. In addition, a wire-loaded MGs LWA designed using a total size of (194.6 × 20 ×1.57 mm) which is enough to radiate efficiency up to 86% and achieve a 53°beam-scanning range for a bandwidth of 9.9-11.9 GHz with a realized gain of up to 12.9 dBi [53]. It should be noted, in comparison to other related works, this work has a wide bandwidth of 64%, beam-scanning range of 74°, small size for total dimensions of 14λ 0 × 0.86λ 0 × 0.036λ 0 that enough to achieve 93% radiated efficiency, low-cost structure, as well as a narrow beamwidth up to 11°, and high realized gain up to 16.3 dBi.…”