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http://dx.doi.org/10.5370/KIEE.2012.61.7.998

A Bandpass Filter with a Desired Phase Shift at The Center Frequency  

Kim, Hong-Joon (경북대학교 전기공학과)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.61, no.7, 2012 , pp. 998-1000 More about this Journal
Abstract
By cascading RHTL (Right-Handed Transmission Line) and LHTL (Left-Handed Transmission Line), we fabricated a BPF (Band Pass Filter) in which the phase propagation at the pass band center frequency is fixed as we want. We utilized a positive phase propagation of a RHTL which is a form of LPF (Low Pass Filter) and negative phase propagation of LHTL which is a form of HPF (High Pass Filter). Therefore, if RHTL and LHTL are cascaded, a BPF can be constructed and the phase propagation inside the passband is decided by the number of RHTLs and LHTLs. In this paper, we provide a detailed theory related to it and proved the theory with an actual experiment. In the experiment, we fabricated two BPFs with similar passband. One with $90^{\circ}$ phase shift and the other with $-90^{\circ}$ phase shift at the center of passband. The result of simulation and actual experiment agrees well. This proves the suggested theory is correct and feasible.
Keywords
RHTL; LHTL; BPF; Metamaterial; Phase shift;
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