A bandwidth enhanced method of a low-profile substrate integrated waveguide (SIW) cavity-backed slot antenna is presented in this paper. Bandwidth enhancement is achieved by simultaneously exciting two hybrid modes in the SIW-backed cavity and merging them within the required frequency range. These two hybrid modes, whose dominant fields are located in different half parts of the SIW cavity, are two different combinations of the and resonances. This design method has been validated by experiments. Compared with those of a previously presented SIW cavity-backed slot antenna, fractional impedance bandwidth of the proposed antenna is enhanced from 1.4% to 6.3%, its gain and radiation efficiency are also slightly improved to 6.0 dBi and 90%, and its SIW cavity size is reduced about 30%. The proposed antenna exhibits low cross polarization level and high front to back ratio. It still retains advantages of low-profile, low fabrication cost, and easy integration with planar circuits.Index Terms-Bandwidth enhanced, cavity-backed slot antenna, hybrid modes, substrate integrated waveguide (SIW).

A new balanced to balanced (BTB) filtering power divider (FPD) based on right triangle substrate integrated waveguide (SIW) cavity is proposed in this article. TE 120 -mode is used in four SIW right triangle cavities to realize required differential-mode (DM) transmission and common-mode (CM) suppression.Grounded resistors are loaded between DM output ports to obtain port-to-port isolation. The transmission zero out of the passband is generated by suppressing the TE 210 mode. A prototype BTB FPD operating at 14.91 GHz is designed, fabricated, and measured for verification. Good accordance between simulation and measurement can be observed.

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This paper proposes a dual-band balanced bandpass filter (BPF) based on a single interfered substrate integrated waveguide (SIW) cavity. The TE 201 , TE 202 , TE 401 , and TE 402 -modes are controlled by the metallic vias and divided into two groups. The first passband is made up of the affected TE 201 and TE 202 -modes, while the second passband is made up of the disturbed TE 401 and TE 402 -modes. In this balanced BPF design, it realizes the requested differential-mode (DM) transmission and common-mode (CM) suppression. Particularly, the bandwidths (BWs) of the two DM passbands can be efficiently controlled by only adjusting the locations of these metallic vias. A prototype dual-band balanced BPF operating at 16.71 and 22.23 GHz with BWs controllable is fabricated and measured for verification.Good accordance between simulation and measurement can be observed.