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Millimeter-wave wideband high-gain LTCC phased array antenna based on ridged substrate integrated waveguide

Published online by Cambridge University Press:  04 August 2025

Sha Xu Open the ORCID record for Sha Xu [Opens in a new window] ,
Guiping Jin ,
Dujiao Lu  and
Shaowei Liao
Sha Xu
Affiliation:
School of Integrated Circuits, Guangdong University of Technology, Guangzhou, China
Guiping Jin*
Affiliation:
School of Electronic and Information Engineering, South China University of Technology, Guangzhou, China
Dujiao Lu
Affiliation:
School of Electronic and Information Engineering, South China University of Technology, Guangzhou, China
Shaowei Liao
Affiliation:
School of Electronic and Information Engineering, South China University of Technology, Guangzhou, China
*
Corresponding author: Guiping Jin; Email: gpjin@scut.edu.cn
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Abstract

In this paper, a millimeter-wave (mmWave) wideband high-gain low-temperature co-fired ceramic (LTCC) phased array using ridged substrate integrated waveguide (RSIW) element is proposed, which can cover n257/n258 bands (24.25–29.5 GHz). First, a novel widebeam and high-gain RSIW slot antenna subarray is designed, which is constructed by staggered longitudinal slot that incorporated with additional radiating elements on the non-scanning plane. Further, the proposed widebeam antenna subarray is applied to construct a 1 × 4 array integrated in an LTCC package with small element spacing of about 0.41λ0. Moreover, by adding isolation slots and metal vias between adjacent array elements, the isolation of ports thereby is reduced below −15 dB, and the scanning range is increased up to ±7°. A wideband and low-loss feeding network is realized by series-parallel combined feeding, further improving isolation and scanning performance after assembly. The simulation and measurement demonstrate that the antenna array possesses satisfied beam-scanning capabilities over wide bandwidth of ∼20%, achieving maximum scanning angle up to ±62° while maintaining desirable gain above 14.5 dBi. Furthermore, within the entire operating bandwidth, the scanning angles extend to ±55° with minimal variation. These features show that the proposed antenna array is promising for 5G mmWave communications.

Keywords

Millimeter-Wave (mmWave)Phased ArrayRidged Substrate Integrated Waveguide (RSIW)5G

Information

Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 11
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Copyright
© The Author(s), 2025. Published by Cambridge University Press in association with The European Microwave Association.

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