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This study involved developing a differential patch antenna array featuring a wide bandwidth and improved radiation patterns. The proposed patch array was fed by a planar, aperture-coupled, L-shaped feeding structure to achieve wideband operation. The differential feeding structure improved the current distribution of resonant modes, substantially improving the symmetry of radiation patterns. The array without differential excitation revealed an apparent deflected peak located at an observation angle of 10 at 13.7 GHz. However, using the proposed differential-fed structure, the location of this peak returned to 0 . The measured results indicated a wide impedance bandwidth of 21.5% and a stable gain varying from 10.3 to 11.52 dBi over the frequency range of 11.6-15 GHz.Index Terms-Differential-fed antenna array, L-shaped feed, patch antenna, symmetrical radiation pattern, wideband.

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In this paper, the integration design of a millimeter-wave filtering patch antenna array fed by a substrate integrated waveguide (SIW) four-way anti-phase filtering power divider is proposed. The multilayer four-way anti-phase filtering power divider handily implemented using the intrinsic field distribution of TE 20 -mode in SIW is proposed for miniaturization. The signal of the lower substrate integrated waveguide cavity (SIWC) bandpass filter is directly coupled to the upper TE 20 -mode SIW through a coupling slot. The intrinsic field distribution of TE 20 -mode SIW is used to generate anti-phase signals. This filtering power divider can be utilized as the feeding structure of a millimeter-wave filtering antenna array. To verify the design concept, a 28-GHz SIW-fed 1 × 4 filtering patch antenna array with three-layer substrates is designed and fabricated. The measured results show a fractional bandwidth of 5.03% ranging from 27.15 to 28.55 GHz, a peak gain of 11.1 dBi, cross-polarization levels lower than -20 dB, symmetric radiation patterns in both E-plane and H -plane, and high selectivity.INDEX TERMS Dual-slot-fed patch, filtering antenna array, millimeter-wave antenna array, substrate integrated waveguide (SIW), TE 20 -mode.

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