Dual Directional Antenna Phase Control for Wireless Interference

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Solution Overview

Problem

Conventional smart speakers face interference between Wi-Fi and Bluetooth devices due to shared frequency bands, leading to reduced effective distance for music playback and poor isolation between antennas, making it difficult to achieve an omnidirectional antenna pattern and function as both a Wi-Fi access point and smart speaker.

Innovation Solution

The design incorporates two directional antennas with a power splitter and phase difference to create an omnidirectional pattern, reducing interference and allowing for increased wireless transmission distance, while isolators enhance coexistence performance and competitiveness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single omnidirectional antenna is used for both Bluetooth and Wi-Fi, then omnidirectional coverage is achieved, but interference between Bluetooth and Wi-Fi signals increases and isolation performance deteriorates

Engineering Contradiction:

Improveomnidirectional coverageVSAvoidsignal interference

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The single omnidirectional antenna is segmented into two separate directional antennas, each optimized for specific transmission directions. This segmentation allows independent control of signal transmission in different spatial regions, reducing mutual interference between Bluetooth and Wi-Fi while maintaining overall omnidirectional coverage through coordinated operation of multiple antennas.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from a single-antenna spatial configuration to a multi-antenna array configuration, adding spatial dimensionality to the system. By distributing multiple directional antennas in different orientations and using beamforming techniques, the system achieves omnidirectional coverage through spatial synthesis rather than relying on a single omnidirectional element, thereby improving isolation between coexisting wireless standards.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Volume of moving object

If conventional IFA antennas are used for Bluetooth and Wi-Fi, then device miniaturization is achieved, but blind spots appear in the horizontal plane and isolation performance is poor

Engineering Contradiction:

Improvedevice sizeVSAvoidantenna pattern coverage

Core Design Contradiction:

Volume of moving objectVSAdaptability or versatility

Solution Approach 1:

Multiple directional antenna elements are merged into a coordinated antenna array system that functions as a unified omnidirectional transmission system. By combining the radiation patterns of multiple directional antennas with appropriate phase and amplitude weighting, the system achieves complete horizontal plane coverage without blind spots, overcoming the limitations of individual compact antenna elements.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If multiple transceivers with multiple antennas are used to overcome omnidirectionality issues, then antenna pattern performance improves, but device complexity and size increase

Engineering Contradiction:

Improveantenna omnidirectionalityVSAvoidnumber of transceivers and antennas

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent designs a multi-antenna system where each antenna element serves multiple functions: individual directional transmission, collaborative omnidirectional coverage, and dynamic beamforming for both Bluetooth and Wi-Fi operations. This multi-functionality reduces the need for separate dedicated antenna systems for different wireless standards, managing complexity through shared infrastructure while maintaining performance.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 solution effectively increases the distance of wireless transmission, eliminates dead spots, and improves coexistence performance between Wi-Fi and Bluetooth systems, enabling the device to function as both a smart speaker and Wi-Fi access point without significant size increases.

Implementation Method 1

a phase difference is provided between the first directional antenna and the second directional antenna

Methodology Applied

Scientific EffectPhase difference:

Implementation Method 2

the first transceiver circuit forms, through the first directional antenna, the second directional antenna and the predetermined phase difference, a predetermined pattern to transmit or receive signals

Methodology Applied

Scientific EffectElectromagnetic radiation:

Data Source

PatentUS20200313280A1Wireless device

Publication Date: 2020.10.01 WISTRON NEWEB CORP

AI summary

A wireless device includes a first transceiver circuit, a power splitter, a first directional antenna, and a second directional antenna. The first directional antenna is connected to a second end of the power splitter and has a first feeding portion and a first radiation unit, and the first feeding portion has a first line length. The second directional antenna is connected to a third end of the power splitter and has a second feeding portion and a second radiation unit, and the second feeding portion has a second line length. A phase difference is provided between the first directional antenna and the second directional antenna. The first transceiver circuit forms, through the first directional antenna, the second directional antenna and the predetermined phase difference, a predetermined pattern to transmit or receive signals, and the predetermined pattern has omnidirectionality.