Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1990-09-21
1991-10-08
LaRoche, Eugene R.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333202, 333235, H01P 1202
Patent
active
050558080
ABSTRACT:
A bandwidth agile, dielectrically loaded resonator filter is disclosed in which conductive strips (320, 322), plated on the top surface (302) of the filter and disposed between resonators (310, 312, 314), are selectively switched to ground in order to affect a change in the bandwidth without appreciably changing the center frequency of the filter response. PIN diode switching networks (316, 318), including a means for biasing the diode, are used to effectively ground the strips between the nearly quarter-wavelength transmission line resonators contained within the block (300) of the filter, thereby capturing a portion of the capacitive coupling (402, 404) which occurs mostly beneath the surface of the filter between adjacent resonators.
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Munn Robert J.
Walker Brian C.
Ham Seung
Jenski Raymond A.
LaRoche Eugene R.
Motorola Inc.
Parmelee Steven G.
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