Integrated Diplexer EMI Shielding for Compact RF Amplifiers

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Solution Overview

Problem

Existing RF amplifiers face challenges in providing effective EMI shielding for components like diplexers, especially at higher frequencies (up to 1.8 GHz), due to limited space within amplifier housings and on circuit boards.

Innovation Solution

An RF component with integrated EMI shielding is proposed, featuring a dielectric component housing, an RF component circuit, and an EMI shield with a shielding portion and engaging members that secure and ground the component to the amplifier chassis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If separate EMI shields are added to shield RF components, then EMI shielding effectiveness is improved, but device complexity and space requirements increase

Engineering Contradiction:

ImproveEMI shielding effectivenessVSAvoidstructure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The EMI shield is integrated directly into the diplexer housing structure, combining the shielding function with the existing component housing. This eliminates the need for separate EMI shields and reduces overall device complexity while maintaining effective EMI protection for the RF components.

Inventive Principle:

Principle #5Merging (Combining)

2Object-affected harmful factors

If separate EMI shields are added to shield RF components, then EMI shielding effectiveness is improved, but the space within amplifier housings is reduced

Engineering Contradiction:

ImproveEMI shielding effectivenessVSAvoidspace utilization

Core Design Contradiction:

Object-affected harmful factorsVSVolume of moving object

Solution Approach 1:

The EMI shield is merged with the diplexer housing structure, eliminating the need for additional separate shielding components. This integration maximizes space utilization within the amplifier housing while providing effective EMI protection, as the shielding function is achieved through the integrated structure rather than adding separate voluminous shields.

Inventive Principle:

Principle #5Merging (Combining)

3Device complexity

If EMI shielding is integrated into the RF component housing, then device complexity is reduced, but manufacturing precision requirements increase

Engineering Contradiction:

Improvestructure complexityVSAvoidshielding position precision

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The EMI shield is pre-integrated into the diplexer housing structure during manufacturing, with engagement features built into the housing design. This preliminary integration ensures precise positioning of the shield relative to the RF components without requiring complex assembly procedures or high-precision field adjustments, as the correct positioning is established during the manufacturing process itself.

Inventive Principle:

Principle #10Preliminary action

4Object-affected harmful factors

If the EMI shield is spaced from the RF component circuit, then EMI shielding effectiveness is improved, but the component housing size increases

Engineering Contradiction:

ImproveEMI shielding effectivenessVSAvoidhousing volume

Core Design Contradiction:

Object-affected harmful factorsVSVolume of stationary object

Solution Approach 1:

The EMI shield is positioned with optimized spacing specifically at critical areas where EMI protection is most needed, rather than uniformly spacing it throughout the entire housing. This local quality approach provides effective EMI shielding where required while minimizing the overall housing volume, as the shield is strategically positioned to protect sensitive RF components without unnecessarily increasing the housing dimensions.

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 integrated EMI shield effectively shortens unnecessary RF signals to ground, reducing cross-talk and RF leaking while allowing the shield to be removed with the diplexer as a single unit, thus improving EMI shielding without requiring separate shields.

Implementation Method 1

an EMI shield integrated into the component housing for shielding the RF component circuit. The EMI shield includes a shielding portion located in the component housing and spaced from the RF component circuit by a predetermined distance

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Implementation Method 2

The engaging members contact an amplifier chassis for securing the RF component to the amplifier chassis and for grounding the EMI shield to the amplifier chassis

Methodology Applied

Scientific EffectElectrical grounding: Earthing

Data Source

PatentUS20250192067A1RF component with integrated EMI shielding

Publication Date: 2025.06.12 APPLIED OPTOELECTRONICS INC(US)

AI summary

An RF component with integrated EMI shielding may be used in an RF amplifier. The RF component includes a component housing made of a dielectric material, an RF component circuit, and an EMI shield integrated with the component housing for shielding the RF component circuit. The EMI shield may include a shielding portion located in the component housing and spaced from the RF component circuit by a predetermined distance and engaging members extending from the shielding portion inside the component housing to outside of the component housing. The engaging members contact an amplifier chassis for securing the RF component to the amplifier chassis and for grounding the EMI shield to the amplifier chassis. One example of the RF component includes a diplexer.