Miniaturized Highly-Efficient Substrate Integrated Waveguide (SIW) Cavity Slot Antenna at 28GHz Based on Through Fused-Silica Via (TFS) Technology

A miniaturized high-efficiency cavity meander-slot antenna, utilizing Substrate Integrated Waveguide (SIW) and Through Fused-Silica Via (TFV) technologies, is designed for operation at 28GHz for millimeter-wave (mmWave) applications. The SIW cavity antenna, with an electrical size of 1.92 × 1.92 mm2(0.032$\lambda _0^2$), achieves a 44% reduction in area compared to a conventional patch antenna. Noteworthy attributes of the TFV-wall structure include: 1) An electromagnetic shielding effect that significantly suppresses mutual coupling in array antennas with a distance (edge-to-edge) of 0.14 mm (0.026 λg), 2) a compact footprint with enhanced antenna performance, and 3) adjustable impedance matching through manipulation of the via parameters. The impact of via diameter pitch on the resonance frequency and return loss has been investigated. The proposed antenna obtains a peak gain of 5.91 dB, a radiation efficiency of 88%, with the isolation enhanced by 17.03 dB.