Broadband high‐gain low‐temperature cofired ceramic substrate integrated cavity antenna array based on high‐order mode for W‐band applications

Abstract

A broadband substrate integrated cavity (SIC) antenna array based on high-order mode is proposed for low-temperature cofired ceramic (LTCC) integrated systems in W-band. To improve the gain of antenna element, a large SIC is adopted to work in high-order mode, which also avoid using excessive vias and reduce the process complexity. Two parasitic patches are loaded on the high-order mode SIC to remove the reverse E-field in the open aperture, leading to a high-gain broadside radiation. The high-order-mode SIC antenna element is fed by high-order TE 20 -mode substrate integrated waveguide (SIW), rather than regular TE 10 -mode SIW. The simplified feeding network with TE 20 -mode SIW is also designed with wideband performance, further enhancing the fabrication robustness of antenna array. To validate the proposed high-order mode-based antenna element and feeding network, a W-band 2 � 4 antenna array is designed as an example using LTCC technology. The measured return loss is better than 10 dB from 81.1 to 98.1 GHz (19% bandwidth) with a maximum gain of 18.3 dB at 94 GHz. The proposed antenna array has great potential in millimetre-wave and terahertz LTCC integrated applications.

A low sidelobe 77 GHz centre‐fed microstrip patch array antenna

“…Nevertheless, they are difficult to integrate with active chips. Low-temperature co-fired ceramics process is more flexible than multi-layer print circuit board (PCB) process, which is easier to realise the multi-layer and complex metallic vias processing, and has also been reported to be used in the MMW radar antenna design [15,16]. The back-fed style of these antennas reduces the influence of the feed network on the antenna's radiation performance.…”