volume | PIER Journals

Abstract

To realize a compact and low-profile Ka-band SIW antenna with continuous wideband operation, a wideband SIW slot antenna based on split Magnetic-electric dipole multi-mode coupling is proposed. The central design idea is to transfer electromagnetic energy from the lower SIW cavity to the upper radiating layer through aperture coupling and to merge two adjacent resonant modes generated by the electric- and magnetic-dipole components. The antenna employs a dual-layer configuration. The lower layer consists of an SIW feeding cavity and a coupling slot, and the upper layer incorporates split arc-shaped patches, a central coupling patch, metallized vias, and a cross-shaped perturbation structure. The split patches mainly generate the high-frequency electric-dipole mode, while the central coupling patch and metallized vias introduce an adjacent lower-frequency magnetic-dipole mode. The cross-shaped perturbation structure further optimizes the impedance transition between the two modes. The simulated results show that the antenna achieves an impedance bandwidth of 26.35-29.20 GHz for |S₁₁| < -10 dB and a peak realized gain of approximately 8.15 dBi at 28 GHz. The fabricated prototype exhibits a measured impedance bandwidth of approximately 26.8-29.1 GHz. In addition, the simulated multifrequency radiation patterns and efficiency results demonstrate relatively stable broadside radiation characteristics within the operating band. The proposed antenna provides a compact and readily integrated solution for Ka-band millimeter-wave communication systems.

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Dr. Mingming Gao

Dr. Bowen Tao

Dr. Ruize Huang

Dr. Xuan Du

Dr. Shibo Sun