Compact 2-pole and 4-pole 2.4-2.8GHz dual-mode tunable filters

Compact 2-pole and 4-pole dual-mode tunable filters have been developed to cover the 2.4-2.8 GHz bandwidth. The filters are based on magnetic coupling (2-pole) and on a mixed-mode coupling (4-pole) so as to result in a near-constant fractional bandwidth over the tuning range. An unloaded tunable fil...

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Bibliographic Details
Main Authors: Stefanini, R., Chatras, M., Blondy, P., Rebeiz, G. M.
Format: Conference Proceeding
Language:English
Subjects:
Bandwidth
Couplings
Insertion loss
Laboratories
Magnetic separation
Microwave filters
Microwave technology
Schottky diodes
Silicon
Varactors
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Summary:Compact 2-pole and 4-pole dual-mode tunable filters have been developed to cover the 2.4-2.8 GHz bandwidth. The filters are based on magnetic coupling (2-pole) and on a mixed-mode coupling (4-pole) so as to result in a near-constant fractional bandwidth over the tuning range. An unloaded tunable filter Q of 50-130 was achieved for both designs, which is quite high when using Silicon Schottky varactor diode for the tunable elements. The filters are integrated on an er=10.2 substrate, are quite small, and result in relatively low insertion loss (2-6 dB) and excellent rejection. The application areas are in reconfigurable communication systems.
ISSN:0149-645X
2576-7216
DOI:10.1109/MWSYM.2010.5514807