Tunable RF Power Amplifier Matching for Wideband Efficiency

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Radio frequency (RF) devices face challenges in achieving wideband frequency operation and high efficiency simultaneously due to conflicting requirements of impedance matching and power efficiency, particularly in portable devices where battery life is a concern.

Innovation Solution

The RF device incorporates a power amplifier module with input and output tunable cavity impedance matching devices, a power amplifier device, and a controller that selects and tunes these devices based on the RF signal source frequency, using piezoelectric bending actuators to adjust capacitance and inductance for impedance matching across a range of frequencies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the operational bandwidth is increased in power amplifiers, then wideband frequency operation is achieved, but simultaneous impedance matching and high efficiency become more difficult to achieve

Engineering Contradiction:

Improveoperational bandwidthVSAvoidimpedance matching performance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent employs dynamically adjustable impedance matching circuits with variable components (such as varactor diodes or switched capacitor networks) that can change their electrical characteristics in real-time to maintain optimal impedance matching across different frequency bands, thereby resolving the contradiction between wideband operation and matching performance

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the electrical parameters (capacitance, inductance, resistance) of the impedance matching circuit components based on the operating frequency, allowing the circuit to adapt its parameters dynamically to maintain high efficiency and proper impedance matching across a wide frequency range

Inventive Principle:

Principle #35Parameter changes

2Reliability

If multiple discrete components are used in impedance matching circuits to maintain impedance coefficient, then impedance matching is maintained, but bulk and power requirements increase

Engineering Contradiction:

Improveimpedance matching maintenanceVSAvoidnumber of discrete components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines multiple discrete impedance matching components into integrated circuit structures or monolithic microwave integrated circuits (MMICs), merging functions that were previously requiring separate components, thereby reducing bulk and complexity while maintaining impedance matching capability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention designs impedance matching circuits with multi-functional components that can serve multiple purposes (impedance matching, filtering, and frequency selection) simultaneously, reducing the total number of discrete components needed while maintaining proper impedance matching across operating bands

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If impedance matching circuits with multiple transistors and diodes are employed, then wide bandwidth operation is achieved, but power requirements and device bulk increase

Engineering Contradiction:

Improvebandwidth operationVSAvoidpower requirements

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent extracts and eliminates unnecessary discrete components (excessive transistors and diodes) from the impedance matching circuit, retaining only the essential elements needed for wideband operation, thereby reducing power consumption and device bulk while maintaining bandwidth capability

Inventive Principle:

Principle #2Taking out (Extraction)

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 ensures efficient impedance matching and high power amplifier efficiency across a wide frequency range, reducing the need for complex manufacturing and multiple discrete components, thereby enhancing battery life and operational flexibility.

Implementation Method 1

using piezoelectric bending actuators to adjust capacitance and inductance for impedance matching across a range of frequencies

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Data Source

PatentUS11258412B2Radio frequency (RF) device having tunable RF power amplifier and associated methods

Publication Date: 2022.02.22 EAGLE TECHNOLOGY LLC

AI summary

A radio frequency (RF) device may include an RF signal source having a selectable frequency, an RF antenna, and an RF power amplifier module coupled between the RF signal source and the RF antenna. The RF power amplifier module may include at least one input tunable cavity impedance matching device, at least one output tunable cavity impedance matching device, and a power amplifier device connected therebetween. A controller may select the selectable frequency of the RF signal source, tune the at least one input tunable cavity impedance matching device based upon the selected frequency, and tune the at least one output tunable cavity impedance matching device based upon the selected frequency.