Leaky-wave radiating surface on heterogeneous high-κ material for monolithic antenna-frontend integration

Author:

Askarian Amirhossein1ORCID,Yao Jianping2ORCID,Lu Zhenguo3ORCID,Wu Ke1ORCID

Affiliation:

1. Poly-Grames Research Center and Department of Electrical Engineering, Polytechnique Montreal (University of Montreal) 1 , Montreal, Quebec H3T 1J4, Canada

2. School of Electrical Engineering and Computer Science, University of Ottawa 2 , Ottawa, Ontario K1N 6N5, Canada

3. Advanced Electronics and Photonics Research Center the National Research Council Canada (NRC) Ottawa 3 , Ontario K1A 0R6, Canada

Abstract

In a highly integrated analog radio-over-fiber transceiver, seamless integration of the antenna-frontend is crucial as an antenna is generally implemented on a high-κ material, which is set to highly degrade the antenna's performance. This work is concerned with the radiation behavior improvement of a planar leaky-wave antenna with an inductive partially reflecting surface (PRS) on a high-κ substrate for the development of a highly directive antenna. To begin with, we show how a thin and single-mode resonance (SMR) inductive PRS on high-κ materials in a planar leaky-wave antenna is set to provoke two resonance frequencies (i.e., PRS and cavity resonances) to converge, thereby diminishing the antenna's broadside directivity. By applying an equivalent circuit model, we explain how a multi-mode resonance (MMR) PRS can adequately be applied to address the underlying challenges. Subsequently, the leaky-wave radiation behavior of an antenna with a heterogeneous substrate is investigated and analytical equations are derived and verified with a full-wave simulation. The effects of material permittivity and thickness in a heterogeneous-cavity antenna on leaky-wave performance are investigated using these approximate yet accurate-enough equations. To justify the findings, two 9 × 9 planar leaky-wave antennas are prototyped on heterogeneous substrates based on SMR and MMR PRS and the radiation performances are compared. Our investigations reveal that in the proposed scenario, an MMR PRS can significantly enhance the antenna's broadside directivity by over 4 dBi at the resonance frequency (27.5 GHz), which is also set to improve radiation pattern compared to a SMR-based antenna. Finally, a single-fed dual-band aperture-shared antenna with a large frequency ratio (S-band and Ka-band) is developed and fabricated on a high-κ substrate based on the proposed MMR PRS.

Funder

National Research Council Canada

Publisher

AIP Publishing

Subject

General Physics and Astronomy

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