Compact HMSIW four‐way filtering power divider with pre‐defined division ratio

• Published in: International journal of RF and microwave computer-aided engineering Vol. 31; no. 10
• Main Authors: Yan, Yu‐Xing, Yu, Wei, Qin, Wei, Du, Ming‐Zhu, Chen, Jian‐Xin
• Format: Journal Article
• Language: English
• Published: Hoboken, USA John Wiley & Sons, Inc 01.10.2021; Hindawi Limited
• Subjects: Bandpass; compact; Division; filtering power divider (FPD); Filtration; half‐mode substrate integrated waveguide (HMSIW); Insertion loss; Power dividers; pre‐defined division ratio; Q factors; Substrate integrated waveguides
• ISSN: 1096-4290; 1099-047X
• DOI: 10.1002/mmce.22841

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.