Abstract
This letter presents a novel wideband, high-efficiency dumbbell-shaped magnetoelectric dipole (DS-MED) antenna array utilizing ridge gap waveguide (RGW) technology for Ka-band applications. The array features three metal layers: a radiation layer with 8 × 8 DS-MED antenna elements, a horn-shaped coupling cavity layer acting as a 1 × 4 power divider and enhancing bandwidth, and a contactless RGW feeding network. The proposed DS-MED antenna element exhibits wideband characteristics, and has a scalable geometrical structure suitable for large planar arrays, while the horn-shaped cavity collimates the electromagnetic waves more effectively to the DS-MED elements and optimizes impedance bandwidth with additional parameters. For validation, an 8 × 8 antenna array prototype is fabricated and tested. The measurement results demonstrate a −10 dB wide impedance bandwidth of 30.3%, cross polarization below −40 dB, and peak realized gain of 28.5 dBi. The proposed DS-MED array offers wideband operation, high efficiency, and scalability to large antenna arrays for Ka-band applications.
| Original language | English |
|---|---|
| Pages (from-to) | 4800-4804 |
| Number of pages | 5 |
| Journal | IEEE Antennas and Wireless Propagation Letters |
| Volume | 24 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2025 |
| Externally published | Yes |
Keywords
- Coupling cavity
- high-gain
- magnetoelectric dipole (MED)
- millimeter-wave (mm-Wave)
- ridge gap waveguide (RGW)