Bandwidth-enhanced SIW cavitybacked antenna array using even and odd modes

Abstract

A novel technique to enhance the bandwidth of substrate-integrated waveguide (SIW) cavity-backed antenna array is presented. The proposed array consists of four SIW cavities connected by inductive windows as feeding network and four wide slots on the surface of each cavity as radiating part. The even–odd mode theory is used to analyse the array. By offsetting the slots from the cavities centre, two different work modes are excited at two resonant frequencies simultaneously and the bandwidth enhancement is achieved by merging them together. A prototype is fabricated to verify the properties of the array. The measured bandwidth can be broadened to 14.5% from 18.25 to 21.1 GHz and the maximal gain can reach up to 12.8 dBi.

Keywords:

• SIW
• antenna
• bandwidth-enhanced
• even and odd modes

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the National Science Foundation of China [grant number 61271103].