A switched reconfigurable high-isolation dual-band bandpass filter
- P. H. Deng, J. H. Jheng
- IEEE Microw. Wireless Compon. Lett., vol. 21, no…
This study presents a novel switchable dual-band filter. An original concurrent dual-band filter uses a hybrid feeding structure such that the external quality factors of the two designated bands can be obtained individually. Therefore, there is no need for a dual-band impedance transformer and time-consuming parameter tuning is avoided. Stepped-impedance quarter-wavelength resonators are used to reduce the circuit size. Two types of switching circuit are added to the original concurrent dual-band filter to obtain a switchable dual-band filter. The proposed switchable dual-band filter has four possible operating states and thus the two passbands can be enabled or disabled independently.