Antenna Feed Shunting for Inactive Transceiver RF Isolation

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Solution Overview

Problem

Conventional wireless relays with multiple transceiver modules operating in adjacent or overlapping channels suffer from self-interference due to signal reflections and automatic gain control activation, leading to performance degradation and potential damage.

Innovation Solution

A wireless relay device with controllable RF switches that shunt inactive antenna feeds to ground, implementing a time division multiplexing schedule to ensure only one transceiver is active at a time, isolating inactive transceivers from RF energy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple transceiver modules operate simultaneously in overlapping or adjacent channels, then communication versatility is improved, but self-interference increases due to signal reflections and automatic gain control activation

Engineering Contradiction:

Improvecommunication versatilityVSAvoidself-interference

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent implements time-division multiplexing where transceiver modules operate in periodic time slots rather than simultaneously. Each transceiver is activated during its designated time interval and shut down during others, converting continuous operation into periodic pulses. This temporal separation eliminates self-interference while maintaining the ability to support multiple communication channels through scheduled access.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent employs preliminary shutdown of transceiver modules before their designated transmission or reception intervals. By proactively disabling transceivers that are not currently scheduled to operate, the system prevents potential self-interference before it can occur. This advance preparation ensures clean RF environment for the active transceiver without requiring complex real-time interference cancellation.

Inventive Principle:

Principle #10Preliminary action

2Volume of moving object

If transceiver modules are placed in physical proximity to reduce device size, then device compactness is improved, but harmful RF energy from one transceiver affects other transceivers

Engineering Contradiction:

Improvedevice sizeVSAvoidRF energy interference

Core Design Contradiction:

Volume of moving objectVSObject-generated harmful factors

Solution Approach 1:

The patent uses periodic activation and shutdown of transceiver modules to manage RF energy exposure. By ensuring that only one transceiver is active at any given time through time-division multiplexing, the system eliminates the problem of simultaneous RF energy emission and reception that would occur in closely spaced modules. This temporal isolation allows compact physical arrangement without sacrificing interference performance.

Inventive Principle:

Principle #19Periodic action

3Power

If transmit power is increased to improve signal strength, then communication range is improved, but automatic gain control systems in receive modes are triggered, decreasing performance

Engineering Contradiction:

Improvetransmit powerVSAvoidreceive performance

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent implements strict time-division multiplexing that completely shuts down receive-mode transceivers during intervals when other transceivers are transmitting. This periodic disconnection prevents high-power transmit signals from ever reaching the receive chains, eliminating automatic gain control triggering and associated performance degradation. The receive transceiver operates in clean conditions during its active intervals with no interference from concurrent transmissions.

Inventive Principle:

Principle #19Periodic action

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

Prevents self-interference and automatic gain control activation, maintaining reliable communication performance and preventing thermal overload by physically decoupling inactive transceivers from RF energy.

Implementation Method 1

shunts the second antenna feed to ground

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS20250350023A1Antenna feed shunt for inactive transceiver isolation in wireless relays

Publication Date: 2025.11.13 GXC LLC

AI summary

A wireless communication relay device includes a first transceiver and a second transceiver, each configured to operate over respective communication channels. The channels of the relay device may be configured for co-channel operation or adjacent channel operation. The relay is configured to operate according to a time division multiplexing schedule such that only one transceiver is active (receiving or transmitting) during a given time interval. During inactive intervals, antenna feeds corresponding to inactive transceivers are shunted to ground using controllable RF switches. This antenna feed shunting prevents inactive transceivers from receiving power emitted into the local RF environment, including power emitted by the active transceiver or reflected by surrounding surfaces.