Dielectric waveguide filter with direct coupling and alternative cross-coupling

Abstract

A dielectric waveguide filter comprising a block of dielectric material covered with an exterior layer of conductive material. A plurality of stacked resonators are defined in the block of dielectric material by one or more slots in the block of dielectric material and an interior layer of conductive material that separates the stacked resonators. First and second RF signal transmission windows in the interior layer of conductive material provide for both direct and cross-coupling RF signal transmission between the stacked resonators. In one embodiment, the waveguide filter is comprised of separate blocks of dielectric material each covered with an exterior layer of conductive material, each including one or more slots defining a plurality of resonators, and coupled together in a stacked relationship.

Description

[0001] Cross References to Related Applications and Co-Pending Applications [0002] This application claims the benefit of the filing date and disclosure of US Provisional Application No. 61 / 730,615, filed November 28, 2012, the contents of which are incorporated herein by reference as if all references were cited therein. [0003] This application also claims the benefit of and is a continuation-in-part of the filing date and disclosure of the following application: U.S. Application Serial No. 13 / 103,712, filed May 9, 2011, and entitled "Dielectric Waveguide Filter with Structure and Method for Adjusting Bandwidth" Nos. 13 / 373,862, filed December 3, 2011, and titled "Dielectric Waveguide Filter with Direct Coupling and Alternative Cross-Coupling"; and filed August 2, 2012, and titled "Tuned Dielectric Waveguide Filter and Method of Tuning", the contents of which are also incorporated herein by reference as if all references were cited therein. technical field [0004] The ...

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Problems solved by technology

However, a disadvantage associated with the incorporation of additional resonators is that it also increases the length of the filter, which in some applications is undesirable or not feasible due to, for example, space constraints on the customer's motherboard.

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