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Abstract
A substrate integrated waveguide (SIW) slot antenna with wideband bandpass filtering performance is proposed in this journal. It consists of a SIW cavity, a transverse slot, three metal posts, and a SMA connector. Three metal posts split the SIW cavity into two TE110-mode resonators. A long nonresonant transverse slot is utilized to realize a half TE110-mode resonator and generate radiation simultaneously so as to reduce the size and release the use of extra radiator. Three in-band resonance poles and a radiation null at both out-of-bands are obtained. A prototype is fabricated and measured. Measured results demonstrate the proposed antenna is with a center frequency of 4.26 GHz, a fractional bandwidth of 9.1%, a high efficiency of 93%, and flat gain response and good skirt selectivity of 270 dB/GHz and 330 dB/GHz for the lower and upper out-of-band, respectively.
Highlights
Modern wireless communications demand the RF frontend system to be compact, lightweight, low cost, high efficiency, and multifunctional
In [9,10,11,12], 3D configurations by placing the resonators under the radiator are applied. In reported works, they suffer from more insertion loss as they all need an extra radiator to cascade the filtering circuit and the filtering circuit is realized by full mode resonators which will lead to a large lossy circuit size
A codesigned wideband filtering substrate integrated waveguide (SIW) slot antenna with high selectivity, high efficiency, and flat gain response is proposed in this journal
Summary
Modern wireless communications demand the RF frontend system to be compact, lightweight, low cost, high efficiency, and multifunctional. Substrate integrated waveguide (SIW) technology has been effectively applied to design high-performance filters and antennas due to its low insertion loss [4,5,6]. As they have no radiation null (transmission zero) in gain response or the radiation nulls are far away from the passband, the out-of-band skirt selectivity in the reported works is low. To overcome these problems, a codesigned wideband filtering substrate integrated waveguide (SIW) slot antenna with high selectivity, high efficiency, and flat gain response is proposed in this journal. Antenna work mechanism is explained, and the results and discussion are given
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