Frequency Stabilization Circuit for Wideband Impedance Matching
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Solution Overview
Problem
Conventional antennas face challenges in matching impedance over a wide frequency band, particularly when transitioning between low and high frequency bands, leading to complex circuit configurations, significant loss, and delayed frequency switching, which limits their suitability for modern communication systems.
Innovation Solution
A frequency stabilization circuit with a primary and secondary reactance element configuration, including inductance and capacitance components, that couples reactance elements in an electromagnetic field to achieve impedance matching across a wide frequency band, reducing insertion loss and signal leakage, and allowing for simple antenna design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a variable capacitance element is used to achieve wide frequency band coverage, then the antenna can match impedance across multiple frequency bands, but the circuit configuration becomes complicated and requires additional switching circuits
Solution Approach 1:
The patent employs a tunable impedance matching circuit that dynamically adjusts its impedance characteristics based on the operating frequency band. The circuit transitions from a static matching network to a dynamic one that can adapt to different frequency ranges (e.g., 700MHz, 800MHz, 900MHz, 1800MHz, 2100MHz, 2600MHz bands) without requiring complex switching mechanisms, thereby resolving the contradiction between wide frequency coverage and circuit simplicity.
2Adaptability or versatility
If a switching circuit is added to control the variable capacitance element, then frequency band switching becomes possible, but loss and distortion increase and gain decreases
Solution Approach 1:
The patent introduces an intermediary impedance transformation mechanism that bridges different frequency bands without requiring direct switching between discrete matching circuits. This intermediary approach uses a continuously tunable impedance network that smoothly transitions between frequency bands, minimizing signal loss and distortion while maintaining adaptability across multiple frequency ranges.
3Adaptability or versatility
If a tunable antenna with variable capacitance is used, then wide frequency band coverage is achieved, but tuning time increases and instant frequency switching becomes impossible
Solution Approach 1:
The patent implements preliminary configuration of the impedance matching circuit by pre-calculating and storing optimal impedance parameters for different frequency bands. When a frequency band change is detected, the system rapidly retrieves and applies the pre-computed matching parameters, significantly reducing tuning time and enabling near-instant frequency switching while maintaining wide frequency band coverage.
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 efficient impedance matching across a wide frequency band, reducing signal loss and distortion, and allowing for rapid frequency switching, thereby enhancing the performance of antennas in communication systems.
Implementation Method 1
a third reactance element that is coupled to the first reactance element in an electromagnetic field
Implementation Method 2
a fourth reactance element that is connected in series between the second reactance element and the third reactance element and coupled to the second reactance element in the electromagnetic field
Data Source
AI summary
A frequency stabilization circuit includes a primary side circuit connected to a feeder circuit, and a secondary side circuit electromagnetically coupled to the primary side circuit. The primary side circuit is a series circuit including a first coiled conductor and a second coiled conductor, and the secondary side circuit is a series circuit including a third coiled conductor and a fourth coiled conductor. An antenna element is connected through a high pass filter to a first antenna connection portion set as a connection point of the first coiled conductor and the second coiled conductor. Additionally, the antenna element is connected through a low pass filter to a second antenna connection portion set as a connection point between the second coiled conductor and the fourth coiled conductor.