Switchable Dual-Band Filter with Hybrid Feeding Structure
Keywords:
Switchable dual-band filter, stepped-impedance resonator, quarter-wavelength resonator.Abstract
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.
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