Abstract
A novel dual-polarized crossed slot planar array antenna is presented in this communication. The proposed design integrates the antenna array with the feeding networks on a single laminate. The antenna element is developed by using a TE210 and TE120 mode cavity, which is constructed by inserting a number of metalized posts around the crossed region of two perpendicular substrate integrated waveguides (SIWs). The crossed slot is etched over the cavity and is excited from two orthogonal directions to realize dual-polarization. Owing to the orthogonality between the TE210 and TE120 mode, high isolation and low cross-polarization are achieved. A prototype of the designed antenna array operating at 25 GHz is fabricated and measured. The measured results confirm that the presented array antenna has high port isolation (>41 dB), high cross-polarization discrimination (XPD) (>26 dB), and high aperture efficiency (40%). With the advantages of simple configuration, good radiation performance, and easy fabrication, this proposed array antenna is a good candidate for millimeter-wave wireless systems.
Highlights
Dual-polarized antennas are highly desirable in modern wireless systems since they can combat multipath fading and improve channel capacity [1]
This is because the feeding networks are interleaved with the antenna elements so that grating lobes will appear if a planar antenna array is realized by using this antenna element
We develop a novel planar dual-polarized crossed slot frequencyscanning antenna array that can be integrated with the feeding networks on a single laminate
Summary
Dual-polarized antennas are highly desirable in modern wireless systems since they can combat multipath fading and improve channel capacity [1]. [10] and [11] can provide dual-polarization while being integrated with the feeding networks on a single laminate, but the orthogonally polarized antenna elements in these antenna arrays are separated in different rows. As a result, these antenna arrays have a relatively large aperture size and high cross-polarization level. We develop a novel planar dual-polarized crossed slot frequencyscanning antenna array that can be integrated with the feeding networks on a single laminate. The antenna has three additional advantages: 1) it is realized on a single laminate with low cost; 2) it is scalable; and 3) it is highly compact and can be integrated with front ends
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