Multilayer dielectric evanescent mode waveguide filter utilizing via holes
AssigneeMerrimac Industries, Inc.
InventorRocco A. De Lillo
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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. The resonators may also be used as feed posts. 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. The perimeter of the filter may be defined by via holes or plated slots.
Claims20
An evanescent mode waveguide filter comprising:
- a plurality of conductive waveguide walls;
- and
- at least two resonators, each one of said resonators comprising a via hole and capacitor having a top electrode and a bottom electrode, wherein said via hole is a feed post and 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 with a perimeter comprising:
- a plurality of conductive waveguide walls;
- and
- at least one resonator comprising a first via hole and a capacitor having a top electrode and a bottom electrode, wherein said first 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;
- wherein said perimeter is defined by additional via holes.
An evanescent mode waveguide filter with a perimeter comprising:
- a plurality of conductive waveguide walls;
- and
- at least one resonator comprising a via hole 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;
- wherein said perimeter is defined by plated slots.
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
- feed post means comprising said via hole means.
An evanescent mode waveguide filter comprising:
- first via hole means for providing a waveguide perimeter;
- and
- means for resonating comprising a second via hole means connected to capacitor means.
An evanescent mode waveguide filter comprising:
- plated slot means for providing a waveguide perimeter;
- and
- means for resonating comprising via hole means connected to capacitor means .
Dependencies are inferred from the claim text.