RF Module TDD Band Segmentation for Isolation

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Solution Overview

Problem

Conventional technologies fail to provide adequate isolation between radio frequency signal paths in Time Division Duplex (TDD) communication bands, leading to increased transfer loss and error vector magnitude (EVM) degradation, especially in broad communication bands used for 5G-NR.

Innovation Solution

A radio frequency module is designed with multiple filters for different TDD communication bands, each with a specific passband, and antenna connection terminals to achieve high isolation between signal paths, allowing for low-loss signal transfer and preventing EVM degradation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional multiplexer technology is used for broad TDD communication bands, then bandwidth coverage is improved, but isolation between adjacent signal paths deteriorates leading to increased transfer loss

Engineering Contradiction:

Improvebandwidth coverageVSAvoidtransfer loss

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent divides the broad TDD communication band into multiple adjacent sub-bands, each handled by a dedicated filter (first filter for first TDD band, second filter for second TDD band, etc.). This segmentation allows each filter to be optimized for its specific frequency range, achieving high isolation between adjacent bands while maintaining overall broad bandwidth coverage for 5G-NR applications.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If conventional multiplexer technology is used for broad TDD communication bands, then bandwidth coverage is improved, but EVM performance deteriorates due to insufficient isolation

Engineering Contradiction:

Improvebandwidth coverageVSAvoidEVM performance

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent segments the broad TDD communication band into multiple adjacent sub-bands, each handled by a dedicated filter. This segmentation ensures that each filter provides optimized isolation for its specific frequency range, preventing signal leakage and interference that would otherwise degrade EVM performance, while still supporting broad bandwidth coverage for 5G-NR.

Inventive Principle:

Principle #1Segmentation

3Reliability

If multiple filters for different TDD bands are implemented, then isolation between signal paths is improved, but device complexity increases

Engineering Contradiction:

Improveisolation between signal pathsVSAvoidnumber of filters

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the broad TDD communication band into multiple adjacent sub-bands, each handled by a dedicated filter. While this increases the number of filters compared to conventional single-filter approaches, it enables high isolation between adjacent bands, ensuring reliable low-loss signal transfer and meeting stringent 5G-NR EVM requirements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each filter in the patent is designed to handle a specific TDD communication band, but the overall system provides universal compatibility with multiple 5G-NR frequency ranges (n77, n78, n79). This multi-functionality allows the filter assembly to support broad bandwidth coverage while maintaining high isolation through specialized frequency-selective filtering for each band.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 solution enables low-loss signal transfer across TDD communication bands, improving isolation and reducing EVM degradation, thus enhancing communication efficiency and compliance with stringent 5G-NR specifications.

Implementation Method 1

a first filter having a passband which is a first frequency range that includes a first communication band allocated as a communication band for Time Division Duplex (TDD)

Methodology Applied

Scientific EffectFrequency filtering: Filter (electronic)

Data Source

PatentUS12088538B2Radio frequency module and communication device

Publication Date: 2024.09.10 MURATA MFG CO LTD

AI summary

A radio frequency module includes: a first antenna connection terminal; a second antenna connection terminal different from the first antenna connection terminal; a first filter having a passband of a first frequency range including a first communication band allocated as a TDD communication band; a second filter having a passband of a second frequency range including a second communication band allocated as a TDD communication band; a third filter having a passband of a third frequency range including a third communication band allocated as a TDD communication band; and a fourth filter having a passband of a fourth frequency range including a fourth communication band allocated as a TDD communication band.