Filters

Cavity Filters

What is a Cavity Filter?
Resonant cavity filters are used as building blocks in duplexers, pre and post selector filters, and in receiver and transmitter multicoupling configurations. Individual cavities may also be used for a variety of interference management applications.

Amateur Radio Wiki - Explanation of a cavity filter?:
https://www.amateur-radio-wiki.net/index.php?title=What_is_a_cavity_filter%3F

RFI Technology Cavity Filters:
https://www.rfiwireless.com.au/multicoupling-monitoring/cavity-filters.html

http://www.repeater-builder.com/antenna/pdf/w6nbc-duplexer-book.pdf

Video - Fun with Cavity Filters:
https://www.youtube.com/watch?v=HyCtuviE1bE&fbclid=IwAR2CG6mJ_lT3CgUn1eXXCUYZChfgNvDvyXSycr1cmN6ffVjAzTyOsH-c6dA

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Measuring Cavity Filters with a VNA

Series Combiners

What is a Series Combiner?
Band Pass and Series Combiner responses are similar; however the Series Combiner is used specifically to provide two distinct and isolated signal paths. One path from a primary input/output to a common feeder line port, which exhibits a the band pass characteristic centred at the resonant frequency of the cavity and the second path from a secondary input / output port to the common feeder line port behaving as a low loss transmission line at frequencies other than the resonant frequency of the cavity.

RFI Technology Combiners:
https://www.rfiwireless.com.au/multicoupling-monitoring/cavity-filters/series-combiner.html

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References