Abstract
A cavity-backed microstrip patch antenna array was optimized in the Ku band. The backing cavity was designed under each patch antenna of the array in order to increase the bandwidth and minimize the intercoupling among the radiating elements. Substrate integrated waveguide (SIW) technology was employed to fabricate the above-mentioned cavity below the radiating patch. More precisely, four microstrip array antennas, made by 2 × 2, 4 × 4, 8 × 8, and 16 × 16 elements were designed, fabricated, and characterized. The measured maximum gain was G = 13 dBi, G = 18.7 dBi, G = 23.8 dBi, and G = 29.2 dBi, respectively. The performance of the proposed antenna arrays was evaluated in terms of radiation pattern and bandwidth. An extensive feasibility investigation was performed even from the point of different materials/costs in order to state the potential of the engineered antennas in actual applications. The obtained results indicate that a cavity-backed microstrip patch antenna is a feasible solution for broadband digital radio and other satellite communication overall for niche applications.
Highlights
IntroductionAn increasing research interest has been directed toward a variety of satellite services provided in the Ku-band frequency range, e.g., digital radio, TeleVision (TV)
During the last decades, an increasing research interest has been directed toward a variety of satellite services provided in the Ku-band frequency range, e.g., digital radio, TeleVision (TV)broadcasting, and broadband Internet
15°broadband operation was obtained by a proper design of both the patch antenna d with lateral cut0.620 and mm feeding line in the corner and Substrate integrated waveguide (SIW) cavity
Summary
An increasing research interest has been directed toward a variety of satellite services provided in the Ku-band frequency range, e.g., digital radio, TeleVision (TV). A broadband SIW cavity-backed microstrip patch antenna was designed and optimized for radiation in the Ku band. Starting from the antennas reported in [18,26,27], the patch geometry has been enhanced by introducing lateral cuts and asymmetric feeding of each single radiating element to obtain a wider operation band and frequency downshift. This means that the radiating elements are smaller, allowing more space for the feeding network and improving the isolation among transmission lines. The radiating element is smaller, allowing a more compact size of the whole array
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