Antenna Tuning Circuitry with Resonant Harmonic Filtering

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Solution Overview

Problem

Conventional antenna tuning circuitry generates harmonic interference that degrades antenna performance, particularly in carrier aggregation configurations where multiple signals are transmitted and received simultaneously, leading to desensitization of receive circuitry.

Innovation Solution

Incorporating a resonant tuning circuit configured to resonate at harmonic frequencies generated by the antenna tuning switch, creating a high or low impedance path to prevent harmonic interference from reaching the antenna while allowing for impedance alteration and frequency tuning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If antenna tuning switches are used to alter impedance and tune frequency, then antenna tuning capability is improved, but harmonic interference is generated that degrades receive circuitry performance

Engineering Contradiction:

Improveantenna tuning capabilityVSAvoidharmonic interference

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

A resonant tuning circuit is introduced as an intermediary component between the antenna tuning switch and the antenna. This circuit is configured to resonate at harmonic frequencies generated by the switching element, creating a high impedance path that blocks harmonic interference from reaching the antenna while allowing the switch to continue performing its impedance tuning function.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The resonant tuning circuit is configured to resonate at the harmonic frequencies generated by the switching element, converting the harmful harmonic interference into a beneficial high impedance condition. By resonating at these frequencies, the circuit naturally creates a high impedance path that blocks the harmonics from reaching the antenna, effectively turning the problem of harmonic generation into a solution for harmonic filtering.

Inventive Principle:

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

2Adaptability or versatility

If conventional antenna tuning circuitry is used in carrier aggregation configurations, then multiple signals can be transmitted and received simultaneously, but receive circuitry becomes desensitized due to harmonic interference

Engineering Contradiction:

Improvecarrier aggregation capabilityVSAvoidreceive circuitry sensitivity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The resonant tuning circuit serves as a protective intermediary between the switching elements and the antenna system. It is specifically configured to resonate at harmonic frequencies that would otherwise interfere with receive circuitry operation, thereby enabling carrier aggregation configurations to operate reliably without desensitization issues.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If switching elements are used to tune antenna impedance, then frequency selectivity is improved, but harmonic distortion is generated that interferes with antenna performance

Engineering Contradiction:

Improvefrequency selectivityVSAvoidharmonic distortion

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The resonant tuning circuit is configured to resonate at the harmonic frequencies generated by the switching element, converting the harmful harmonic distortion into a beneficial high impedance condition. By resonating at these frequencies, the circuit naturally creates a high impedance path that blocks the harmonics from reaching the antenna, effectively turning the problem of harmonic generation into a solution for harmonic filtering.

Inventive Principle:

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

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

The solution effectively prevents harmonic interference from reaching the antenna, enabling efficient tuning and improved performance across multiple frequency bands without degrading the antenna's reception capabilities.

Implementation Method 1

the resonant tuning circuit is configured to resonate at one or more harmonic frequencies generated by the antenna tuning switch such that a high impedance path is formed between the antenna tuning switch and the antenna tuning node at harmonic frequencies

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS9865922B2Antenna tuning circuitry with reduced interference

Publication Date: 2018.01.09 QORVO US INC

AI summary

Antenna tuning circuitry includes an antenna tuning node, an antenna tuning switch, and a resonant tuning circuit. The antenna tuning node is coupled to a resonant conduction element of an antenna. The antenna tuning switch and the resonant tuning circuit are coupled in series between the antenna tuning switch and the antenna tuning node, such that the resonant tuning circuit is between the antenna tuning node and the antenna tuning switch. The resonant tuning circuit is configured to resonate at one or more harmonic frequencies generated by the antenna tuning switch such that a high impedance path is formed between the antenna tuning switch and the antenna tuning node at harmonic frequencies generated by the antenna tuning switch. Accordingly, harmonic interference generated by the antenna tuning switch is prevented from reaching the antenna, while simultaneously allowing for tuning of the antenna.