Abstract
A class of 45° linearly polarized and circular polarized high scanning rate leaky wave antennas are proposed in this paper, which is based on slow-wave substrate integrated waveguide structure. High scanning rate leaky wave antennas have recently become attractive for imaging applications and automotive radar. These applications also require a continuous scanning range without an open stopband, as seen at broadside for ordinary leaky wave antennas. Furthermore, both 45° linearly polarization and circularly polarization are required in practical applications. In this paper, we propose an all-in-one leaky wave antenna design, which features high scanning rate, continuous scanning capability across the broadside, 45° linear polarization or circularly polarization, single-layer configuration, and single-side radiation. Two design examples are provided to illustrate the proposed principle. Both simulation and experimental validation are given.
Highlights
Leaky wave antennas (LWAs) belong to a class of travelling wave antennas, which exhibit continuous leakage along their structures
We propose an all-in-one LWA design, which features high scanning rate, continuous scanning capability across the broadside, 45◦ linear polarization, single-layer configuration, and single-side radiation
To the authors’ best knowledge, 45◦ linear polarization and circular polarization are explored for the first time in high scanning-rate LWAs, which will find wide applications in high-speed microwave imaging and automotive radar
Summary
Leaky wave antennas (LWAs) belong to a class of travelling wave antennas, which exhibit continuous leakage along their structures. Periodic LWAs are able to support a scanning both in backward and forward directions This leads to an increased scanning range of such antennas, making them attractive for imaging applications. In [23], a novel SIW based LWA was proposed, which exhibited a linear curve of phase constant in scanning from backward to forward directions This was achieved by optimizing the distance between two vias at one lateral wall of a periodically slotted SIW. Most of previously reported LWAs use a large frequency variation to achieve a small range of angles They are not useful for an imaging application, where scanning rate (defined as the rate of change of main beam direction θ with respect to frequency) is preferred as high as possible [28]. To the authors’ best knowledge, 45◦ linear polarization and circular polarization are explored for the first time in high scanning-rate LWAs, which will find wide applications in high-speed microwave imaging and automotive radar
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