Combline filters are bandpass filters used in the frequency range of 100MHz to 20GHz The structure consists of a series of TEM resonators of circular or rectangular cross-section resonated by a capacitor at the open circuit end. The bandwidth and response of the filter is governed by the coupling of each resonator to its immediate neighbor. This is also a function of the resonator size, resonator spacing and ground plane separation. Typical construction is silver-plated aluminum, which achieves the lowest passband loss while maintaining a light weight. Computer design programs result in close correlation between theoretical and actual performance.
TMS COMBLINE FILTER PRODUCTS AT-A-GLANCE
In applications where flat group-delay narrowband filters are required, linear phase responses of typically 1 to 5% variations over 70% of the filter bandwidth can be achieved making them ideally suited for critical receiver front-end or transmitter applications
TMS has combined excellent robust filter characteristics with years of experience to offer its customers a unique capability that meets the most demanding requirements.