Phase Corrected H-Plane Horn Antenna in Gap SIW Technology

Lei Wang, Marc Esquius-Morote, Hongye Qi, Xiaoxing Yin, Juan R. Mosig

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)


This communication introduces a modified substrate integrated waveguide (SIW), the gap SIW, and deduces an approximate closed-form expression for calculating its effective width, taking into account the fringing and coupling fields around the gap. As an immediate application, this new structure is used to correct the phase distribution of an H-plane SIW horn antenna. The achieved quasi-uniform distribution results in a greatly enhanced antenna gain without deteriorating the bandwidth. To further improve both radiation and impedance matching, printed tapered-ladder transitions are introduced in front of the horn aperture. Software optimization confirms the possibility of simultaneously achieving an excellent phase correction (and hence increased gain) and a good impedance matching in a probe-excited horn antenna model. Measurements on a homemade prototype validate the design strategy. The final compact Ka-band planar horn antenna achieves an enhanced gain of 10.3 dBi at 34 GHz, with an impedance bandwidth of 20%.
Original languageEnglish
Pages (from-to)347-353
Number of pages7
JournalIEEE Transactions on Antennas and Propagation
Issue number1
Early online date1 Nov 2016
Publication statusPublished - Jan 2017


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