Abstract
A novel millimeter-wave 2 × 2 substrate integrated waveguide (SIW) cavity-backed patch subarray with a simplified feeding structure is presented. Two higher order SIW cavity modes (quasi-TE410 and quasi-TE330 modes) are designed using eigenmode analysis to support 2 × 2 patches with in-phase radiation. The proposed 2 × 2 patch subarray has multiple resonant modes and a simplified feeding network. Moreover, this subarray can create a radiation null at the upper band edge, which helps to synthesize the filtering response. To verify the potential application in large-scale array, four 2 × 2 subarrays are combined into a 4 × 4 circularly polarized filtenna array with a filtering sequentially rotated feeding network. The measurements of the fabricated filtenna array show an operating bandwidth of 8.9% from 26.6 to 29.1 GHz (|S11| < -10 dB and AR < 3 dB), a peak gain of 15.9 dBic, and stable boresight radiation patterns. Excellent bandpass filtering response with high out-of-band rejection levels of 32 and 48 dB in the lower and upper stopbands, respectively, is observed.
| Original language | English |
|---|---|
| Pages (from-to) | 739-743 |
| Number of pages | 5 |
| Journal | IEEE Antennas and Wireless Propagation Letters |
| Volume | 22 |
| Issue number | 4 |
| DOIs | |
| State | Published - 01 04 2023 |
Bibliographical note
Publisher Copyright:© 2002-2011 IEEE.
Keywords
- Cavity-backed patch
- circularly polarized (CP)
- filtenna array (filtering antenna array)
- high-order mode
- millimeter-wave (mmW)
- substrate integrated waveguide (SIW)