Dual‐band shared‐aperture antenna with high aperture reuse ratio and high isolation

Abstract

This work presents a dual-band (3.5/26 GHz) shared-aperture antenna with high aperture reuse ratio and high isolation. The proposed 26-GHz 4 Â 4 substrate integrated waveguide (SIW) cavity-backed slot array antenna consists of four hybrid TE 130 -TE 310 -mode SIW cavities, which can simplify the design of feeding network. The radiating slots are unequally offset and inductance windows are added for good impedance matching. The entire structure of the 4 Â 4 slot array antenna also functions as an equivalent TM 10 -mode patch antenna at 3.5 GHz. The resonant frequency of the patch is fine-tuned by inserting an air gap instead of enlarging the patch length, thus ensuring high aperture reuse ratio. To enhance channel isolation, the patch is designed with a bandpass filtering response centered at 3.5 GHz by introducing a stub-loaded resonator feeding structure. For demonstration, a prototype of the proposed dual-band antenna was fabricated and measured. The measured results show that the proposed antenna achieves excellent dual-band performance, and its aperture reuse ratio and channel isolation are as high as 87.5% and 62 dB, respectively. K E Y W O R D Saperture reuse ratio, cavity-backed antenna, dual-band antenna, shared-aperture antenna

A high-gain dual-band shared-aperture array integrating zero-order-resonance patch and higher-order metasurface antenna

“…Besides, the stacked designs may have higher profiles than others. In 2 and 15 , the high-frequency substrate integrated waveguide (SIW) slot array structures were reused as radiation patch in the low-frequency band, which results in a high aperture reuse ratio. However, there exists only one low-frequency element in these designs.…”

“…In addition, shared-aperture arrays with the large frequency ratio and high realized gains have ignited intensive attentions in the past decade. In terms of the dual-band shared-aperture array, many solutions have been reported in literature, such as the stacked designs 9 , 10 , the co-planar designs 11 , 12 , and the shared-structure designs 13 – 15 . The last one has advantages of low profile, high structure reuse ratio, and the avoidance of the block effect.…”