A leaky-wave antenna array based on a multi-mode substrate integrated waveguide coupler

By integrating a multimode substrate integrated waveguide coupler and a leaky antenna element on a dielectric substrate, equal-amplitude in-phase even-mode signals and equal-amplitude out-of-phase odd-mode signals are generated, solving the problems of low integration and insufficient electrical performance of traditional leaky antenna structures. This achieves high isolation, wide bandwidth and continuous beam scanning, improving the measurement accuracy of radar systems.

CN121529210AActive Publication Date: 2026-02-13SUZHOU LAIR MICROWAVE INC
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Patent Information

Application Number
CN202610061196.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-16
Publication Date
2026-02-13
Estimated Expiration
2046-01-16

AI Technical Summary

Technical Problem

Traditional leaky wave antennas have low structural integration and large profile height, making them difficult to adapt to the compact requirements of modern millimeter wave systems. In terms of electrical performance, the beam scanning is discontinuous and the open stopband is prone to lifting, making it difficult for the sum and difference beams to work together with high gain and low sidelobes, resulting in low measurement accuracy.

Method used

A multimode substrate integrated waveguide coupler is adopted, which integrates the multimode substrate integrated waveguide coupler and the leaky antenna element on the dielectric substrate. By exciting the modes within the same frequency range, equal-amplitude and in-phase even-mode signals and equal-amplitude and out-of-phase odd-mode signals are generated and fed into symmetrically arranged leaky antenna elements respectively. Combined with tapered microstrip lines, microstrip lines and slot cross-coupling, metallized isolation via arrays and asymmetric unit structures, high isolation and wide bandwidth characteristics are achieved, supporting continuous beam scanning.

Benefits of technology

It achieves a low-profile, high-isolation, and wide-bandwidth antenna array, enabling continuous beam scanning in complex electromagnetic environments, improving the detection reliability and angle measurement accuracy of the radar system, and enhancing the radiation performance and measurement accuracy of the sum and difference beams.

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Abstract

The application provides a leaky-wave antenna array based on a multimode substrate integrated waveguide coupler, relates to the technical fields of wireless communication and radar, and comprises a dielectric substrate, a multimode substrate integrated waveguide coupler and two leaky-wave antenna units. The multimode substrate integrated waveguide coupler is integrated on the dielectric substrate and is configured to excite modes and modes of the substrate integrated waveguide respectively in the same frequency range, generate even-mode signals with equal amplitude and in-phase and odd-mode signals with equal amplitude and opposite phase. The two leaky-wave antenna units are symmetrically arranged on the two sides of the upper surface metal layer of the dielectric substrate and are connected with two output ports of the multimode substrate integrated waveguide coupler respectively. The two leaky-wave antenna units are configured to radiate a wave beam and a difference wave beam in response to the even-mode signals and the odd-mode signals. The application solves the problem of low measurement accuracy of a traditional single-pulse antenna, has the technical effects of simplifying the design of a feed network, improving radiation performance and thus improving measurement accuracy.
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