Tunable filter systems, devices and method

Abstract

Systems, devices, and methods for tunable filters that are configured to support multiple frequency bands, such as within the field of cellular radio communication, can include a first resonator and a second resonator configured to block signals within one or more frequency ranges, and one or more coupling element connected to both the first resonator and the second resonator. The one or more coupling element can be configured to provide low insertion loss within a pass band.

Description

[0001] priority claim [0002] This application claims the benefit of U.S. Provisional Patent Application No. 61 / 793,089, filed March 15, 2013, and U.S. Provisional Patent Application No. 61 / 859,621, filed July 29, 2013, both of which are incorporated by reference in their entirety combined here. technical field [0003] The subject matter disclosed herein relates generally to electromagnetically tunable filters and methods of making the same. More specifically, the subject matter disclosed herein relates to systems, apparatus, and methods for tunable filters configured to support multiple frequency bands, such as within the field of cellular radio communications. Background technique [0004] In modern handheld devices for cellular communication systems (eg, 3GPP), multiple frequency bands are desirably supported (eg, 3GPP LTE bands 7, 1, 2, 3, 8, 5 and 13). Due to technical and size constraints, support for multiple frequency bands has traditionally been achieved using a...

AI Technical Summary

Problems solved by technology

Conversely, tunable multi-resonant filters have also been reported to have the following problems: the filter is not small enough, the filter has no power handling capability, or the filter is too complicated or not repeatable for use in hand-held cellular Properly integrated within the device

As a result, the problem with scalable systems is to make them cost-effective and small, while meeting system requirements (eg, 3GPP standards)

[0006] Also, in addition to the issue of the type of filter elements used to support multiple frequency bands, there are issues of transmitter and receiver elements interacting within a frequency division duplex system, transmitter and receiver elements passing one or varying frequencies separate simultaneous operation

[0010] Yet another problem with placing filters in modern phones is that the filters have design constraints on component heights of less than 1 mm, so they can be co-located with RF transceiver ICs, digital processing ICs, and multimedia processing ICs

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