| Title |
A Bandpass Filter with a Desired Phase Shift at The Center Frequency |
| DOI |
https://doi.org/10.5370/KIEE.2012.61.7.998 |
| Keywords |
RHTL ; LHTL ; BPF ; Metamaterial ; Phase shift |
| 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° phase shift and the other with -90° 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. |