A novel uniplannar dual-mode bandpass filter (BPF) using a slotline-fed structure is proposed in this paper. A hairpin-slot coupling scheme is employed to couple a signal from a feeding-slotline to a slot-ring resonator. A coplanar waveguide (CPW) to slotline transition is used to conform SMA connectors to the circuit. Introduction of two orthogonally oriented feeding slotlines and a field perturbation that is 135° away from both feeds produces a dual-mode resonance in the slot-ring. The insertion loss of the filter is less than 5 dB at its resonant frequencies. Also, extending the region of field perturbation can increase the filter bandwidth. The out-band rejections are over 35 dB and 50 dB, respectively, at the lower-band and upper-band edges. Experiments are conducted to verify the circuit performance.
|Number of pages||6|
|Journal||Journal of the Chinese Institute of Electrical Engineering, Transactions of the Chinese Institute of Engineers, Series E/Chung KuoTien Chi Kung Chieng Hsueh K'an|
|Publication status||Published - 2003 Nov 1|
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering