RF Module Isolation Structure for Dense Antenna PIMD Reduction

Solution Overview

Problem

Existing antenna apparatuses face issues with radio wave interference and passive intermodulation distortion (PIMD) due to densely installed antenna elements, leading to signal leakage and decreased efficiency, while maintaining compactness and avoiding size increase is a challenge.

Innovation Solution

The RF module includes elongated RF filter units, radiating element units with interference prevention walls, and a radome panel with decoupling patterns to minimize interference and PIMD, allowing dense installation without increasing size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If a large number of antenna elements are densely installed to achieve compactness and MIMO functionality, then the antenna apparatus can satisfy high-performance requirements and reduce size, but coupling between antenna elements increases causing signal leakage and decreased efficiency

Engineering Contradiction:

Improveantenna apparatus sizeVSAvoidsignal efficiency

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The antenna apparatus is divided into multiple RF modules, each containing separate antenna elements. Isolation walls are introduced to segment the space between adjacent antenna elements, physically dividing the radiation space to reduce coupling effects while maintaining compact overall structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Isolation walls are introduced as intermediary structures between adjacent antenna elements. These walls act as mediators that block electromagnetic coupling between elements while allowing each element to maintain its radiation function, thus preventing signal leakage without increasing overall apparatus size.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Volume of moving object

If RF modules are densely arranged to achieve compact design, then the antenna apparatus can be miniaturized, but radio wave interference between modules increases

Engineering Contradiction:

Improveantenna apparatus sizeVSAvoidradio wave interference

Core Design Contradiction:

Volume of moving objectVSObject-generated harmful factors

Solution Approach 1:

The antenna apparatus is divided into multiple RF modules, each containing separate antenna elements. Isolation walls are introduced to segment the space between adjacent antenna elements, physically dividing the radiation space to reduce coupling effects while maintaining compact overall structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Isolation walls are extended in the vertical direction (z-axis) between adjacent antenna elements arranged in the horizontal plane. By utilizing the vertical dimension for isolation, the design achieves interference reduction without increasing the horizontal footprint, thus maintaining compactness.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Volume of moving object

If antenna elements are placed under spatial constraints to reduce size, then the apparatus can be miniaturized, but coupling between elements increases leading to passive intermodulation distortion (PIMD)

Engineering Contradiction:

Improveantenna apparatus sizeVSAvoidpassive intermodulation distortion

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

The antenna apparatus is divided into multiple RF modules, each containing separate antenna elements. Isolation walls are introduced to segment the space between adjacent antenna elements, physically dividing the radiation space to reduce coupling effects while maintaining compact overall structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Isolation walls are pre-positioned between antenna elements before radiation occurs, creating physical barriers that prevent harmful coupling and PIMD from occurring in the first place. This preliminary protective action ensures clean signal transmission even under spatial constraints.

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS20250379355A1RF module for antenna and antenna apparatus including same

Publication Date: 2025.12.11 KMW INC

AI summary

Disclosed herein is a radio frequency (RF) module for antennas and an antenna apparatus including the RF module. The RF module includes a plurality of RF filter units each including a filter body formed to be elongated in a vertical direction, a plurality of radiating element units having a length greater than a length of the plurality of RF filter units, and detachably secured and electrically connected to respective front ends of the plurality of RF filter units, and radio wave interference isolation walls respectively coupled to opposite ends of each of the plurality of radiating element units in a width direction, and disposed in a partitioned manner to minimize radio wave interference with adjacent radiating element units. This configuration may enable simple installation and replacement, and may improve overall communication efficiency of the antenna apparatus.