2022, Volume 23, Issue 10
Frontiers of Information Technology & Electronic Engineering >> 2022, Volume 23, Issue 10 doi: 10.1631/FITEE.2200122
Planar dual-polarized millimeter-wave shared-aperture array antenna with high band isolation
Affiliation(s): State Key Lab of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing 210096, China; Frontiers Science Center for Mobile Information Communication and Security, Southeast University, Nanjing 210096, China; Purple Mountain Laboratories, Nanjing 211111, China; less
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Abstract
A planar millimeter-wave shared-aperture array antenna is proposed and designed in this paper. By composing the substrate integrated waveguide (SIW) and the stripline, the K-band antenna is embedded inside the Ka-band antenna to achieve a smaller size and a low profile by sharing an aperture. The Ka-band antenna radiates through the parallel slot pairs on the surface of the SIW cavities with horizontal polarization, while the K-band antenna radiates through the butterfly-shaped slots with vertical polarization, which are also designed on the surface. Then the two array antennas can radiate by sharing a common aperture with high isolation. To verify this idea, a prototype of an 8×8 shared-aperture array antenna has been designed with center frequencies of 19 and 30 GHz and fabricated using multilayer printed circuit board (PCB) technology. The measurement results show that the −10 dB impedance bandwidths in the K- and Ka-bands are 7.73% and >20%, and the corresponding isolations are higher than 60 and 44 dB, respectively. The proposed shared-aperture antenna has a small footprint, a low profile, and high isolation, and is a promising candidate to design compact millimeterwave wireless systems.
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