Parallel Switched Capacitor Tuning Element for Higher RF Tuning Ratio
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Solution Overview
Problem
Existing radio frequency devices face challenges in increasing the tuning ratio of their tuning elements, which affects adjustable radio frequency parameters such as radiation intensity, resonance frequency, and phase.
Innovation Solution
The implementation of a tuning element comprising a first capacitor element with a switch and a second capacitor element connected in parallel, along with choke coils and additional capacitors and switches, enhances the tuning ratio by allowing for greater capacitance variation and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single capacitor element is used in the tuning element, then the device complexity is low, but the tuning ratio is limited
Solution Approach 1:
The tuning element is segmented into multiple capacitor elements (first capacitor element with switch and capacitor, second capacitor element with capacitor) connected in parallel. Each capacitor element can be independently controlled through its associated switch, allowing selective activation to achieve different capacitance values and expand the tuning ratio without excessively increasing overall device complexity.
Solution Approach 2:
The patent introduces a new dimension of control by adding switches and choke coils to the capacitor elements. This creates an additional control layer where switches can selectively connect or disconnect capacitor elements, and choke coils can control DC voltage application to variable capacitors, thereby expanding the tuning capability beyond what a single capacitor element could provide.
2Adaptability or versatility
If multiple capacitor elements with switches and choke coils are added to increase tuning ratio, then the tuning ratio increases, but the device complexity increases
Solution Approach 1:
The switch and choke coil components serve multiple functions: switches not only connect/disconnect capacitor elements but also control the activation of variable capacitors; choke coils not only block RF signals from DC voltage sources but also enable DC voltage control of variable capacitors. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity while achieving expanded tuning ratio.
3Adaptability or versatility
If variable capacitors with DC voltage control are used, then the tuning ratio increases, but RF signal leakage to DC voltage sources occurs
Solution Approach 1:
Choke coils are introduced as intermediary components between the RF signal path and DC voltage sources. These choke coils have high impedance to RF signals, effectively blocking RF signal leakage to DC voltage sources, while simultaneously allowing DC voltage to pass through to control the variable capacitors. This intermediary solution enables both high tuning ratio and RF signal isolation.
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 effectively increases the tuning ratio, thereby improving adjustable radio frequency parameters and radiation direction of electromagnetic waves.
Implementation Method 1
a first capacitor element including a first switch and a first capacitor electrically coupled to the first switch and a second capacitor element including a second capacitor. The first capacitor element is electrically connected in parallel with the second capacitor element
Data Source
AI summary
An electronic device including a tuning element is provided. The tuning element includes a first capacitor element including a first switch and a first capacitor electrically coupled to the first switch and a second capacitor element including a second capacitor. The first capacitor element is electrically connected in parallel with the second capacitor element.