In this article, a novel and simple design approach of millimeter-wave (mm-wave) low sideand back-lobe substrate integrated waveguide (SIW) filtenna array is investigated by using predefined filtering power divider (FPD). The FPD consists of two coupled SIW cavities operating at TE 101 and TE 301 modes, respectively. The TE 301 mode divides the energy from Cavity 1 into three parts equally and three outputs are loaded to Cavity 2 for power distribution, making the FPD design simplified. Based on this, the predefined power splitting ratio (1:1:1 and 1:3:1) of the FPDs can be obtained easily by controlling the output external quality factor (Q e ). Accordingly, the side and back lobes of the filtenna array are suppressed by using the proposed FPD with predefined power splitting ratio of 1:3:1. To verify the proposed approach, a 3 × 3 filtenna array prototype centered at 27.2 GHz is designed, fabricated and measured. The measured results show an impedance bandwidth (|S 11 | < −10 dB) of 1.8 %. The filtenna array performs good gainpassband selectivity with an in-band peak gain of 11.1 dBi, and the side lobe is suppressed more than 20 dB while the front-to-back ratio is over 30 dB. Good agreement is achieved between simulated and measured results.INDEX TERMS Substrate integrated waveguide (SIW), filtering power divider (FPD), slot antenna array, millimeter-wave (mm-wave), side lobe, back lobe.
A novel and simple design approach of compact four‐way filtering power divider (FPD) using half‐mode substrate integrated waveguide (HMSIW) cavity is investigated in this letter. The pre‐defined power division ratio of the four outputs is obtained by adjusting the external quality factor (Qe) of each output port, while the total output Qe is equal to the input Qe. The four outputs are loaded to a single HMSIW resonator, achieving a compact size. Meanwhile, both bandpass response and power division can be designed independently. For demonstration, a prototype with pre‐defined power division ratio of 1:3:3:1 is designed, fabricated, and measured. The measured results show that the FPD centered at 4.88 GHz owns a 3‐dB fractional bandwidth (FBW) of 11.3%. The insertion loss of the passband is about 1.4 dB and the return loss is better than 17 dB, meanwhile the phase differences of in‐phase four outputs are all within 5° from 4.61 to 5.16 GHz. Good agreement is observed between the simulated and measured results.
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