Multilayer dielectric evanescent mode waveguide filter
AssigneeMerrimac Industries, Inc.
InventorRocco A. De Lillo
Life of this patent
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Abstract
A multilayer dielectric evanescent mode waveguide bandpass filter with resonators utilizing via hole technology is capable of achieving very narrow bandwidths with minimal insertion loss and high selectivity at microwave frequencies is provided. A typical implementation of this filter is fabricated with soft substrate multilayer dielectrics with high dielectric constant ceramics. This filter typically takes up less space than other filters presently available. A typical implementation operates at a center frequency of 1 GHz, although other center frequencies, such as approximately 0.5 GHz to approximately 60 GHz, are achievable.
Claims15
An evanescent mode waveguide filter comprising:
- a plurality of conductive waveguide walls;
- and
- at least one resonator comprising a via hole structure and a capacitor having a top electrode and a bottom electrode, wherein said via hole substantially extends from one of said plurality of conductive waveguide walls to said top electrode of said capacitor, and said bottom electrode of said capacitor is short-circuited to another of said plurality of conductive waveguide walls.
An evanescent mode waveguide filter comprising conductive wall means for providing a waveguide, and means for resonating comprising via hole means connected to capacitor means, wherein said waveguide comprises polytetrafluoroethylene composite substrates bonded into a multilayer structure.
An evanescent mode waveguide filter comprising conductive wall means for providing a waveguide, and means for resonating comprising via hole means connected to capacitor means, wherein:
- said capacitor means comprises a first dielectric material means having a first dielectric constant;
- said capacitor means is adjacent to a second dielectric material means having a second dielectric constant;
- and
- said first dielectric constant is substantially different from said second dielectric constant.
An evanescent mode waveguide filter comprising conductive wall means for providing a waveguide, and means for resonating comprising via hole means connected to capacitor means, wherein:
- said conductive wall means provides at least one substantially open end with an area;
- and
- said substantially open end is adjacent to a propagating waveguide means, said propagating waveguide means providing a cross-section larger than said area of one of said at least one substantially open end.
An evanescent mode waveguide filter comprising conductive wall means for providing a waveguide, means for resonating comprising via hole means connected to capacitor means, and at least one microstrip means having at least a portion extending inside a cavity formed by said conductive wall means.
An evanescent mode waveguide filter comprising conductive wall means for providing a waveguide and means for resonating comprising via hole means connected to capacitor means, wherein said means for resonating comprises a plurality of resonators, and wherein said capacitor means comprises a plurality of capacitors having unique dielectric constants.
Dependencies are inferred from the claim text.