RF Module Multiband Filtering Segmentation

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Solution Overview

Problem

Existing radio frequency modules for multiband communication are large due to the need for multiple bandpass filters, which increase in size and complexity compared to other types of filters.

Innovation Solution

A radio frequency module design that includes a switching circuit and band elimination filters, allowing for selective signal paths and reduced size by using a single bandpass filter and multiple band elimination filters, which are integrated to support multiple communication bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple bandpass filters are used for multiband communication, then communication compatibility is improved, but device size increases

Engineering Contradiction:

Improvemultiband communication compatibilityVSAvoidmodule size

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent divides the filtering function into two separate components: a single bandpass filter that defines the overall frequency range, and multiple band elimination filters that selectively remove specific frequency bands. This segmentation allows the system to support multiple communication bands using one bandpass filter combined with selectively activated elimination filters, reducing the need for multiple complete bandpass filters and thereby reducing module size.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bandpass filter serves as a universal component that handles the common frequency range for all communication bands. The band elimination filters are added only when specific band rejection is needed, allowing the same bandpass filter to support multiple different communication band configurations without requiring separate filters for each band, thus achieving multi-functionality with reduced size.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If multiple bandpass filters are used for multiband communication, then communication compatibility is improved, but device complexity increases

Engineering Contradiction:

Improvemultiband communication compatibilityVSAvoidfilter circuit complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The filtering system is segmented into a permanent bandpass filter and optional band elimination filters. This segmentation simplifies the base configuration to a single bandpass filter while providing the capability to add only specific elimination filters when needed, rather than requiring complete multiple bandpass filter assemblies, thereby reducing overall system complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using multiple complete bandpass filters with full functionality for each band, the patent applies local quality by using a single bandpass filter for the common range and adding band elimination filters only at the specific frequency locations where band rejection is required. This localized approach reduces the overall complexity compared to having multiple full-featured bandpass filters.

Inventive Principle:

Principle #3Local quality

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

The module achieves a reduction in size while maintaining compatibility with multiband communication standards, suppressing insertion loss degradation by optimizing signal path usage and filter configurations.

Implementation Method 1

The bandpass filter is disposed on a first signal path connecting the first terminal to the first switch terminal, and has a first passband

Methodology Applied

Scientific EffectBandpass filtering: Filter (electronic)

Implementation Method 2

The first band elimination filter is disposed on a second signal path connecting the second switch terminal to the second terminal, and has a first elimination band

Methodology Applied

Scientific EffectBand elimination filtering: Filter (electronic)

Data Source

PatentUS11581908B2Radio frequency module and communication device

Publication Date: 2023.02.14 MURATA MFG CO LTD

AI summary

A radio frequency module includes a first terminal, a second terminal, a third terminal, a first switching circuit, a bandpass filter, a first band elimination filter, and a first wiring conductor. The first switching circuit switches between a connection between a first switch terminal and a second switch terminal and a connection between the first switch terminal and a third switch terminal. The bandpass filter is disposed on a first signal path connecting the first terminal to the first switch terminal, and has a first passband. The first band elimination filter is disposed on a second signal path connecting the second switch terminal to the second terminal, and has a first elimination band included in the first passband. The first wiring conductor forms a third signal path connecting the third switch terminal to the third terminal.