Switchable Dielectric Resonator for Wide-Range RF Frequency Tuning
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Solution Overview
Problem
Existing tunable RF resonators face challenges in achieving high Q factor values, low power consumption, wide tuning range, fast tuning speed, good linearity, high power handling, and small size, which limits their practical application in communication devices.
Innovation Solution
A frequency tunable resonator is designed with a dielectric block coated with a conductive layer, featuring an input and output port, a resonator electromagnetically connected to these ports, and at least one dielectric opening forming a conductive tuning pattern. An electrically controllable switch connects the tuning pattern to a conductive structure, allowing the resonator to switch between two frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional tuning filter solutions are used, then frequency tuning capability is achieved, but high Q factor and low power loss are not simultaneously satisfied
Solution Approach 1:
The patent replaces mechanical tuning methods with electrically controllable switches that can conductively connect conductive tuning patterns to conductive structures. This electrical substitution eliminates mechanical contact losses while maintaining frequency tuning capability through electronic control of the resonator's electrical characteristics.
Solution Approach 2:
The patent changes the electrical parameters of the resonator by selectively connecting different conductive tuning patterns through controllable switches. By altering the effective capacitance and inductance values through switch states, the resonator frequency can be tuned while maintaining high Q factor because the switches operate in a high-impedance state during resonance, minimizing energy loss.
2Adaptability or versatility
If multiple tuning elements are added to expand frequency bands, then adaptability improves, but device size increases
Solution Approach 1:
The patent implements a universal tuning mechanism where a single controllable switch can connect to multiple conductive tuning patterns, each corresponding to different frequency bands. This multi-functional switch structure allows one component to perform the work of multiple separate tuning elements, expanding frequency band support without proportionally increasing device area.
Solution Approach 2:
The patent merges multiple tuning functions into a single integrated structure by combining multiple conductive tuning patterns and switches within one filter device. The conductive patterns are arranged to share common conductive structures and control signals, allowing frequency aggregation where multiple resonators share tuning elements, thereby reducing overall device size while maintaining wide frequency coverage.
3Area of stationary object
If tuning elements are miniaturized to reduce footprint, then device size decreases, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses thin conductive layers and flexible conductive patterns printed or deposited on substrate surfaces. These thin-film conductive structures can be manufactured using standard PCB or semiconductor fabrication techniques with relaxed tolerances compared to three-dimensional mechanical tuning elements. The conductive patterns maintain their electrical function even with minor dimensional variations, reducing manufacturing precision requirements while achieving miniaturization.
4Speed
If fast tuning speed is achieved through electrical switching, then response time improves, but insertion loss increases
Solution Approach 1:
The patent employs dynamically controllable switches that can transition between high-impedance (open) and low-impedance (closed) states. During normal resonance operation, switches maintain a high-impedance state to minimize energy loss and maintain high Q factor. When tuning is required, the switches rapidly transition to connect different conductive patterns, achieving fast tuning speed. The dynamic impedance control ensures that insertion loss is minimized during steady-state operation while maintaining the capability for rapid frequency changes.
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 proposed resonator solution provides a low-profile, small-footprint system that is easy to implement and modify, offering a wide tuning range and fast switching speed while minimizing insertion loss, thus enhancing the flexibility and performance of tunable filters in communication devices.
Implementation Method 1
a resonator arranged inside the dielectric block and being electromagnetically connected to the input and the output, respectively... the frequency tunable resonator being configured to: resonate at a first frequency when the electrically controllable switch is operating in its non-active state, and resonate at a second frequency when the electrically controllable switch is operating in its active state
Implementation Method 2
at least one electrically controllable switch configured to conductively connect the conductive tuning pattern to a conductive structure when operating in its active state
Data Source
AI summary
The present disclosure relates to a frequency tunable resonator comprising a dielectric block having a surface coated with a conductive layer. The frequency tunable resonator further comprises a conductive tuning pattern at the surface of the dielectric block delimited by an opening in the conductive layer. An electrically controllable switch is configured to conductively connect the conductive tuning pattern to a conductive structure. The frequency tunable resonator will therefore resonate at a first frequency (F1) when the electrically controllable switch is operating in its non-active state, and resonate at a second frequency (F2) when the electrically controllable switch is operating in its active state.