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Miniature tunable filters

A technique for tuning filters, band-pass filters, used in tunable filters, filters, impedance networks, etc.

Active Publication Date: 2018-08-28
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Multiple acoustic resonators per tunable resonator unit

Method used

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  • Miniature tunable filters
  • Miniature tunable filters
  • Miniature tunable filters

Examples

Experimental program
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Embodiment Construction

[0032] Before describing the exemplary embodiments in detail, it should be noted that the embodiments reside primarily in combinations of device components and processing steps associated with miniature tunable bandpass and bandstop filters for wireless transceivers. Accordingly, such components have been represented, where appropriate, by conventional symbols in the drawings and only those specific details that are relevant to an understanding of the embodiments are shown so as not to obscure the subject matter with details that would be readily understood by one of ordinary skill in the art having the benefit of the description herein. public.

[0033] As used herein, relative terms such as "first" and "second", "top" and "bottom" are only used to distinguish one entity or element from another, and do not necessarily require or Any physical or logical relationship or order between such entities or elements is implied.

[0034] In some embodiments, a tunable filter design in...

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Abstract

A tunable filter using acoustic resonators is disclosed. A tunable filter includes a plurality of tunable resonator units (20). Each tunable resonator unit (20) has acoustic wave resonators (12). Eachacoustic wave resonator is associated with a different tunable frequency. Each tunable resonator unit also has a first switch (22) configured to select one of the plurality of acoustic wave resonators of the tunable resonator unit at a time. The first switches of the plurality of tunable resonator units are coupled to cooperatively select one acoustic wave resonator in each one of the plurality of tunable resonator units, wherein a selected acoustic wave resonator in a tunable resonator unit of the plurality of tunable acoustic resonator units is associated with a same tunable frequency response as the other selected acoustic resonators of the others of the plurality of tunable acoustic resonator units. The selection results in an overall tunable frequency response.

Description

technical field [0001] Wireless communications, specifically, miniature tunable bandpass and bandstop filters for wireless transceivers. Background technique [0002] Tunable filters are used in transceivers of wireless communication devices, such as in base stations and portable wireless devices (eg, cellular phones, tablet computers, portable computing devices, etc.). Compared with filter banks or switchable filters with fixed passband or fixed stopband, tunable filters exhibit a tunable continuous frequency response across frequency bands. From a practical point of view, tunable filters should be small in size and light in weight. Conventional microwave tunable filters are too large, bulky and expensive for most commercial wireless communication applications. [0003] Acoustic wave resonators such as surface acoustic wave (SAW) resonators, bulk acoustic wave (BAW) resonators, and film bulk acoustic resonators (FBAR) are small in size, light in weight, and relatively ine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/56H03H9/60H03H9/64
CPCH03H9/568H03H9/605H03H9/6409H03H9/6483H03H2210/012H03H2210/025H03H9/0004H03H9/52H03H9/542H03H2210/033
Inventor C·简
Owner TELEFON AB LM ERICSSON (PUBL)