Self-Tuning RF Cavity Combiner for Extended Frequency Range

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Solution Overview

Problem

Existing RF signal combiners face limitations in operating frequency range due to deviation from optimized frequencies, leading to excess loss of RF power and sub-optimal performance, as they rely on fixed transmission line lengths that are not adaptable to varying frequencies.

Innovation Solution

A self-tuning transmitter combiner with a computer-implemented controller that adjusts filters and a reactive element to maximize the lowest insertion gain and minimize reflected powers by interpolating cavity positions and setting the reactive element to optimal tuning positions, ensuring optimal performance across a range of frequencies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If fixed transmission line lengths are used in the combiner, then the combiner can be manufactured with simple structure, but the operating frequency range is limited and RF power loss increases when deviating from the original frequency

Engineering Contradiction:

Improveoperating frequency rangeVSAvoidRF power loss

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent applies dynamics by making the transmission line lengths adjustable rather than fixed. The combiner includes multiple transmission lines with different lengths that can be dynamically selected or adjusted to match different operating frequencies, allowing the system to adapt to varying frequency requirements while maintaining optimal performance and minimizing RF power loss.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of transmission line length to optimize performance across different frequencies. By providing multiple transmission lines with varying lengths and selecting the appropriate line based on the operating frequency, the system maintains optimal impedance matching and minimizes RF power loss throughout the extended frequency range.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If fixed transmission line lengths are used in the combiner, then the device complexity is reduced, but the adaptability to varying frequencies is limited

Engineering Contradiction:

Improvefrequency adaptabilityVSAvoidcombiner structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent achieves universality by designing the combiner to handle multiple frequency ranges using the same basic structure with selectable transmission lines. The combiner can serve multiple frequency bands (e.g., 70-80 GHz and 90-100 GHz) by selecting appropriate transmission line lengths, eliminating the need for separate combiners for different frequency ranges.

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

The solution enables the combiner to maintain optimal performance by dynamically adjusting to varying frequencies, minimizing reflections and maximizing transmission efficiency, thus overcoming the limitations of fixed transmission line lengths.

Implementation Method 1

The resonant cavity in each signal path is tuned to the frequency of its corresponding transmitter

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

tune the reactive element such that a lowest insertion gain selected by the controller from a plurality of insertion gains respectively associated with the plurality of signal paths is maximized

Methodology Applied

Scientific EffectEnergy storage in reactive component: Capacitance

Data Source

PatentUS20240195040A1Self-Tuning Resonant Cavity RF Transmitter Combiner with Extended Tuning Frequency Range

Publication Date: 2024.06.13 NORSAT INTERNATIONAL

AI summary

A self-tuning, resonant cavity transmitter combiner joins multiple RF transmitters and combines their signals onto a single transmission line. An additional tuning element is added to the junction of the signal paths to overcome the bandwidth limitations of the transmission lines joining the signal paths. An algorithm was developed to optimize the RF performance of the combiner by sampling the RF signals at various points in the RF circuit.