Adaptive Receiver Leakage Cancellation for High-Power Transceivers

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Solution Overview

Problem

High output power systems face challenges in reducing transmission leakage signals while maintaining transceiver performance, as existing solutions like band-pass filters either reduce transmit output power or increase noise figures.

Innovation Solution

An adaptive receiver with a band-pass filter and a leakage signal canceller, which includes adjacent metal layers generating a coupling effect to cancel transmission leakage signals, and a low noise amplifier with a controller to optimize input P1 dB and impedance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If high transmit power is used in the transmitter to improve communicable distance, then the transmission power increases, but the transmission leakage signal delivered to the receiver increases

Engineering Contradiction:

Improvetransmission powerVSAvoidtransmission leakage signal

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The patent uses the transmission signal itself to generate a cancellation signal that eliminates the harmful leakage signal. The band-pass filter extracts the transmission signal, and the leakage signal canceller uses it to create an opposing signal that cancels the leakage, converting the harmful leakage into a beneficial cancellation mechanism.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent applies preliminary anti-action by generating the cancellation signal before the leakage signal reaches the receiver. The band-pass filter and leakage signal canceller prepare and apply the opposing signal in advance, preventing the harmful leakage from affecting the receiver rather than merely mitigating it after the fact.

Inventive Principle:

Principle #9Preliminary anti-action

2Object-affected harmful factors

If a band-pass filter is used in the transmitter to reduce transmission leakage signal, then the leakage signal decreases, but the transmit output power and efficiency are reduced

Engineering Contradiction:

Improvetransmission leakage signalVSAvoidtransmit output power

Core Design Contradiction:

Object-affected harmful factorsVSPower

Solution Approach 1:

The patent extracts only the necessary function of filtering by using a band-pass filter selectively to extract the transmission signal for cancellation purposes, rather than using it to broadly attenuate all signals. This extraction approach allows leakage reduction while preserving transmit output power and efficiency.

Inventive Principle:

Principle #2Taking out (Extraction)

3Object-affected harmful factors

If a band-pass filter is used in the receiver to reduce transmission leakage signal, then the leakage signal decreases, but the noise figure within the receiver increases

Engineering Contradiction:

Improvetransmission leakage signalVSAvoidnoise figure

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The patent introduces an intermediary cancellation signal that mediates between the transmission signal and the received signal. This intermediary approach allows leakage reduction without directly filtering the received signal, thereby avoiding the noise figure increase that would result from traditional filtering methods in the receiver.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Object-affected harmful factors

If the first metal layer and the second metal layer are disposed adjacent to each other to generate a coupling effect, then the transmission leakage signal is canceled, but the device complexity increases

Engineering Contradiction:

Improvetransmission leakage signalVSAvoidstructure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent resolves the complexity issue by transitioning to a planar configuration where the first metal layer and second metal layer are disposed side by side in the same layer rather than stacking them vertically. This dimensional change simplifies the device structure while maintaining the coupling effect necessary for leakage cancellation.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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

Effectively attenuates transmission leakage signals, improves low noise amplifier performance by optimizing input P1 dB, and maintains transceiver efficiency without increasing noise figures.

Implementation Method 1

the first metal layer and the second metal layer are disposed adjacent to each other to generate a coupling effect

Methodology Applied

Scientific EffectCoupling effect: Electromagnetic Induction

Data Source

PatentUS12255673B2Adaptive receiver for high output power system and transceiver including the same

Publication Date: 2025.03.18 AGENCY FOR DEFENSE DEV

AI summary

An adaptive receiver for a high output power system includes a band-pass filter that receives a transmission signal output from a transmitter and outputs a transmission signal for canceling a leakage signal from which noise has been removed, and a leakage signal canceller that includes a first metal layer through which the transmission signal for canceling the leakage signal flows and a second metal layer through which a transmission leakage signal by the transmission signal flows, in which the first metal layer and the second metal layer are disposed adjacent to each other to generate a coupling effect, the transmission leakage signal for canceling the leakage signal flows in a reverse direction to a direction in which the transmission leakage signal flows, and the transmission leakage signal is canceled.