Abstract
This paper presents a cavity-backed antenna array in substrate integrated waveguide (SIW) technology in the millimeter-wave frequency band. The proposed antenna design uses double slots as radiating elements instead of conventional single slots. The double slots allow better control in the design of the operating frequency bands of the cavity-backed antenna. The performance of the cavity-backed antennas with single and double slots is compared to assess the enhanced behavior of the double slots. As a proof of concept, a 2 × 2 array of cavity-backed antennas is designed, manufactured, and measured. Each cavity-backed antenna contains 2 × 2 double slots; thus, a 4 × 4 antenna array is considered. The experimental operating frequency band of the proposed antenna array ranges from 35.4 to 37 GHz. There is a good agreement between the simulated and measured results. The measured gain is around 17 dBi in the whole operating frequency band with a 75% total antenna efficiency.
Highlights
Substrate integrated waveguide (SIW) is a technology enabling the design and manufacture of miniaturized waveguides
substrate integrated waveguide (SIW) technology mimics a dielectric waveguide that is implemented in a planar form due to the use of metallized vias, which form a waveguide in the employed substrate [1]
In [7], a 60 GHz antenna array is presented where multiple SIW layers were fabricated on low-temperature co-fired ceramic (LTCC)
Summary
Substrate integrated waveguide (SIW) is a technology enabling the design and manufacture of miniaturized waveguides. In [7], a 60 GHz antenna array is presented where multiple SIW layers were fabricated on low-temperature co-fired ceramic (LTCC). In this case, the radiating element is an aperture backed by a cavity. In [8], the feeding layer is based on microstrip, while the radiating elements in the antenna array in [9] were implemented in a metallic plate. We propose a cavity-backed antenna array whose radiating elements are double slots at millimeter-wave frequencies. A compact corporate feeding network is used and each backed cavity contains a subarray of 2 × 2 double slots, increasing the directivity of the complete antenna array. The proposed antenna represents a low-cost design with enhanced radiation performance for radiofrequency (RF) front-end hardware in future communications systems at millimeter-wave bands
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