Broadband Balun in LTCC Technology Using Vertical Solenoid Coupled Transmission Lines

Abstract

In this paper we propose the way to improve broadband characteristics of Marchand balun using vertical solenoid coupled transmission lines with a high coupling coefficient k = 0.6. Balun shows the maximum amplitude imbalance of 0.7 dB and the maximum phase imbalance of 6deg in the 0.7 - 3.5 GHz frequency band. Balun has been designed using low temperature cofired ceramic technology (DuPont system 951)