Title :
Realization of high-order S-plane bandpass Marchand balun with no lumped elements
Author :
Yun-Wei Lin ; Chi-Yang Chang
Author_Institution :
Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
A high-order wideband planar balun is proposed in this paper. The balun is exactly synthesized using Richards´ Theorem. Applying the S-plane bandpass other than high-pass prototype can shrink the circuit size and improve the stopband performance. Using the step impedance transformation, the proposed balun can be easily implemented in planar structure without lumped elements to fit the user-defined specification. A high-order balun with bandwidth about 100% and reflection level of -20dB is designed as an example. The simulation and measurement results are matched well.
Keywords :
baluns; equivalent circuits; transmission lines; Richard theorem; equivalent circuit; high-order S-plane bandpass Marchand balun; high-order wideband planar balun; high-pass prototype; planar structure; step impedance transformation; step impedance transmission lines; Equivalent circuits; Impedance; Impedance matching; Microstrip; Prototypes; Slotline; Wideband; Balun; S-plane bandpass prototype; planar structure; synthesis;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2012 Asia-Pacific
Conference_Location :
Kaohsiung
Print_ISBN :
978-1-4577-1330-9
Electronic_ISBN :
978-1-4577-1331-6
DOI :
10.1109/APMC.2012.6421867