Impedance Converting Circuit With Negative Inductance
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Solution Overview
Problem
Existing impedance converting circuits for communication terminal apparatuses face challenges in optimizing impedance across a wide frequency band, leading to increased insertion loss and complex configurations, particularly when dealing with multiple frequency bands and varying antenna element sizes and shapes.
Innovation Solution
An impedance converting circuit is introduced, featuring a first matching circuit with tightly coupled inductance elements that generate an equivalent negative inductance component, coupled with a second matching circuit including reactance elements, to provide impedance matching between high-frequency circuits over a wide frequency band while maintaining low-loss performance and simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If passive matching circuits are used for wide frequency band coverage, then impedance matching is achieved, but the number of elements increases and insertion loss increases
Solution Approach 1:
The patent employs variable capacitance elements that can be dynamically adjusted to change the matching characteristics of the circuit. This dynamic adjustment allows the same circuit structure to adapt to different frequency bands without requiring separate fixed matching circuits for each band, thereby reducing the total number of elements while maintaining wide frequency coverage and low insertion loss.
Solution Approach 2:
The patent changes the electrical parameters (capacitance values) of the matching circuit elements to achieve impedance matching across different frequency bands. By varying the capacitance parameters of the variable capacitance elements, the circuit can be optimized for different frequency ranges without increasing the number of physical elements, thus reducing insertion loss while maintaining adaptability.
2Manufacturing precision
If passive matching circuits are adjusted for each frequency band, then impedance optimization is achieved, but the number of elements increases
Solution Approach 1:
The patent designs a universal matching circuit structure that can serve multiple frequency bands through the use of variable capacitance elements. Instead of creating separate optimized circuits for each frequency band, this single multi-functional circuit can be adjusted to match different impedance requirements across various bands, thereby reducing the total number of elements while maintaining precise impedance optimization.
Solution Approach 2:
The variable capacitance elements provide dynamic adjustment capability, allowing the same physical circuit to be optimized for different frequency bands on demand. This eliminates the need for multiple fixed optimized circuits, reducing device complexity while maintaining the ability to achieve precise impedance matching for each band when needed.
3Adaptability or versatility
If active matching circuits with variable capacitance elements are used, then wide frequency band matching is achieved, but the circuit configuration becomes complicated
Solution Approach 1:
The patent uses variable capacitance elements that can be dynamically controlled to adjust the matching characteristics. By implementing control logic that automatically selects appropriate capacitance values based on the operating frequency band, the circuit achieves wide frequency band matching while keeping the configuration relatively simple through automated control rather than complex manual switching networks.
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor the operating conditions and automatically adjust the variable capacitance elements to maintain optimal impedance matching. This feedback-based automatic adjustment simplifies the overall circuit configuration by eliminating the need for complex manual switching networks and multiple control circuits, while still achieving wide frequency band adaptability.
4Adaptability or versatility
If switching circuits are added for frequency band switching, then variable capacitance control is achieved, but loss and distortion increase
Solution Approach 1:
The patent employs variable capacitance elements that can be continuously or steplessly adjusted without requiring discrete switching operations. This dynamic adjustment mechanism eliminates the need for traditional switching circuits that cause loss and distortion, while still achieving frequency band switching capability through smooth parameter transitions rather than abrupt switches.
Solution Approach 2:
The patent replaces mechanical or electronic switching circuits with a variable capacitance control system that adjusts impedance matching continuously or in steps without physical switching. This substitution eliminates the high loss and distortion associated with switching circuits, while maintaining the ability to switch between frequency bands through parameter adjustment rather than circuit reconfiguration.
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 enables efficient impedance matching across a wide frequency band, reducing insertion loss and simplifying the circuit design, allowing for effective operation in various communication systems without significant impedance changes, thus enhancing the performance of communication terminal apparatuses.
Implementation Method 1
a first matching circuit including a first inductance element connected to the first high-frequency circuit, and a second inductance element connected to the second high-frequency circuit and coupled to the first inductance element
Data Source
AI summary
An impedance converting circuit module includes a first matching circuit, a feeding-circuit-side matching circuit interposed between the first matching circuit and a feeding circuit, and an antenna-side matching circuit interposed between the first matching circuit and a radiating element. The feeding-circuit-side matching circuit performs impedance matching between a feeding port of the feeding circuit and the first matching circuit, and the antenna-side matching circuit performs impedance matching between a port of the radiating element and the first matching circuit.