Directional Coupler Layout for Shared-Antenna Interference Isolation

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Solution Overview

Problem

Co-located antennas in mobile communication devices experience interference due to signal coupling, which degrades the signal-to-noise ratio and user experience.

Innovation Solution

A directional coupler is used to couple multiple transceivers to shared antennas, allowing one transceiver to receive signals through a second antenna while isolating interference from a transmitting first transceiver, with optional tunable loads for improved interference cancellation in changing environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple transceivers are co-located in a mobile device, then device functionality and versatility are improved, but antenna coupling interference increases

Engineering Contradiction:

Improvedevice functionalityVSAvoidantenna coupling interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the antenna system by providing separate antenna paths for transmitting and receiving operations. The first antenna is dedicated for receiving signals while the second antenna handles transmitting, thereby separating the interfering functions and eliminating coupling interference between co-located transceivers.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent extracts the interfering transmitting function from the receiving path by routing transmitted signals through a second antenna rather than allowing them to couple into the first antenna. This extraction removes the harmful interfering signal from the reception path, allowing clean signal reception despite the presence of multiple active transceivers.

Inventive Principle:

Principle #2Taking out (Extraction)

2Device complexity

If a single antenna is shared by multiple transceivers, then device complexity is reduced, but signal-to-noise ratio deteriorates due to interference

Engineering Contradiction:

Improveantenna system complexityVSAvoidsignal-to-noise ratio

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

While maintaining a relatively simple antenna system, the patent segments the signal paths by directing received signals through a first antenna and transmitted signals through a second antenna. This segmentation prevents interference without requiring complex active cancellation circuits or switching mechanisms, thus preserving signal-to-noise ratio while controlling overall system complexity.

Inventive Principle:

Principle #1Segmentation

3Device complexity

If the second transceiver uses the second antenna for receiving, then interference from the first transceiver is present, but device simplicity is maintained

Engineering Contradiction:

Improveantenna configuration simplicityVSAvoidinterference at receiver

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent implements segmentation of antenna functions where the first antenna is dedicated for receiving and the second antenna is dedicated for transmitting. This clear functional segmentation eliminates the need for complex switching or isolation circuits, maintaining device simplicity while completely preventing interference from the transmitting transceiver at the receiving transceiver.

Inventive Principle:

Principle #1Segmentation

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

This configuration reduces or eliminates interference, enhancing the signal-to-noise ratio and signal processing efficiency, thereby improving user experience by allowing the second transceiver to receive desired signals without interference from the first transceiver's transmissions.

Implementation Method 1

coupling a first transceiver to a first antenna through a directional coupler. A second transceiver is also coupled to the first antenna (i.e., sharing the first antenna) using the directional coupler

Methodology Applied

Scientific EffectDirectional coupling:

Implementation Method 2

a load (not limited to matched load) may be coupled to the directional coupler to assist with interference cancellation

Methodology Applied

Scientific EffectElectromagnetic absorption: Absorption (EM radiation)

Data Source

PatentUS11901620B2Coexistence through directional coupler

Publication Date: 2024.02.13 QORVO US INC

AI summary

A directional coupler for co-located antennas contemplates coupling a first transceiver to an antenna through a directional coupler. A second transceiver is also coupled to the antenna using the directional coupler. When the first transceiver is transmitting, the second transceiver may receive through the antenna without suffering interference from signals transmitted by the first transceiver. To facilitate signal handling, a tunable or variable load may also be coupled to the directional coupler.