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access icon free Differential SIW slot antenna array with intrinsic common-mode rejection

© The Institution of Engineering and Technology
Received 25/11/2019, Accepted 14/05/2020, Revised 30/01/2020, Published 15/05/2020

In this study, the differential substrate integrated waveguide (SIW) slot antenna array is proposed with intrinsic common-mode (CM) rejection. Through field analysis, it is found that the SIW is a natural differential transmission line which can only transmit differential signal due to the characteristics of hybrid electromagnetic boundary perfect electrical conductor and perfect magnetic conductor. Hence, it can also be seen as a natural balun with intrinsic CM suppression. Thus, a compact 1 × 4 differential SIW slot antenna array with high CM rejection can be designed using the differential microstrip transition structure which has little conversion between differential-mode (DM) and CM. For the design of differential SIW passive device, the DM equivalent half circuit is a single-ended SIW device with height halved. Further, the 4 × 4 differential SIW antenna array with high CM rejection can be designed with a T-shaped differential SIW four-way power divider. The 1 × 4 and 4 × 4 differential SIW antenna arrays are fabricated and good agreements between the simulated and measured results demonstrate the validity of proposed configurations.

Inspec keywords: power dividers; baluns; microstrip transitions; slot antenna arrays; substrate integrated waveguides; waveguide antenna arrays

Other keywords: T-shaped differential SIW four-way power divider; differential SIW antenna array; perfect magnetic conductor; differential substrate integrated waveguide; natural balun; intrinsic CM suppression; differential signal; DM equivalent half circuit; slot antenna array; differential microstrip transition structure; single-ended SIW device; intrinsic common-mode rejection; hybrid electromagnetic boundary perfect electrical conductor; differential SIW passive device; high CM rejection; compact differential SIW slot antenna array; natural differential transmission line

Subjects: Antenna arrays

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