Shared RF Filter for Multi-Band Mobile Transceivers

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Solution Overview

Problem

Modern mobile communication devices face increased complexity and susceptibility to interference due to the need to support multiple frequency bands and duplexing methods, leading to higher costs and crosstalk, as they require numerous RF filters and complex circuitry.

Innovation Solution

A mobile communication device design that uses a single RF filter compatible with multiple standards and duplexing methods, reducing complexity and interference by employing a bandpass filter with a wide passband, allowing both RF signals to pass through while blocking undesirable frequencies, and utilizing electroacoustic components like SAW, BAW, or GBAW filters with optimized piezoelectric material orientation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple RF filters are used to support different frequency bands and duplexing methods, then compatibility with various mobile communication standards is improved, but device complexity and manufacturing costs increase

Engineering Contradiction:

Improvecompatibility with frequency bands and duplexing methodsVSAvoidnumber of RF filters and circuitry

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies a single RF filter that is designed to handle multiple frequency bands and duplexing methods (FDD, TDD, GSM) simultaneously. This universal filter replaces what would traditionally require multiple separate filters, reducing device complexity while maintaining versatility across different mobile communication standards.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines multiple filter functions into a single RF filter component. By merging the functionality of multiple frequency-selective filters into one unified filter structure, the patent reduces the overall number of components while maintaining support for various frequency bands and duplexing methods.

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If multiple RF filters are used to support different frequency bands, then adaptability to communication standards is improved, but susceptibility to crosstalk increases

Engineering Contradiction:

Improvesupport for multiple frequency bandsVSAvoidcrosstalk between signal paths

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and eliminates the source of crosstalk by using a single RF filter instead of multiple filters. By removing the additional filter components that would create separate signal paths, the patent eliminates the primary source of crosstalk while maintaining multi-band capability through the universal filter design.

Inventive Principle:

Principle #2Taking out (Extraction)

3Device complexity

If a single RF filter with wide passband is used, then device complexity is reduced, but filter design difficulty and manufacturing precision requirements increase

Engineering Contradiction:

Improvenumber of RF filtersVSAvoidfilter design and quality factor control

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent employs parameter changes in the filter design, specifically optimizing the quality factor (Q) and bandwidth characteristics to achieve a wide passband while maintaining acceptable selectivity. By carefully adjusting these parameters, the patent creates a universal filter that is manufacturable while providing multi-band support.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design reduces the number of RF filters and pins required, lowers manufacturing costs, and improves signal quality by simplifying the front-end circuitry while maintaining compliance with diverse frequency standards and duplexing methods, despite the challenges of wide bandwidths and varying quality factors.

Implementation Method 1

utilizing electroacoustic components like SAW, BAW, or GBAW filters with optimized piezoelectric material orientation

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

utilizing electroacoustic components like SAW, BAW, or GBAW filters

Methodology Applied

Scientific EffectSurface acoustic wave: Surface Acoustic Wave

Implementation Method 3

utilizing electroacoustic components like SAW, BAW, or GBAW filters

Methodology Applied

Scientific EffectBulk acoustic wave:

Implementation Method 4

utilizing electroacoustic components like SAW, BAW, or GBAW filters

Methodology Applied

Scientific EffectGuided bulk acoustic wave:

Data Source

PatentUS9929751B2Mobile transceiver with shared user filter, method for the operation of the mobile transceiver and use of a filter

Publication Date: 2018.03.27 SNAPTRACK INC

AI summary

A mobile communication device includes an antenna and a transceiver circuit having a first port for transmitting first RF signals and a second port for transmitting second RF signals. The second RF signals are different than the first RF signals. A single RF filter is electrically connected between the antenna and the transceiver circuit. The RF filter has an antenna port coupled to the antenna and a transceiver port coupled to the transceiver circuit. The transceiver port of the RF filter is coupled to the first port and to the second port of the transceiver circuit.