Frequency Stabilization Circuit for Mobile Antenna Impedance Matching
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Solution Overview
Problem
Existing antenna apparatuses in mobile communication terminals face challenges in stabilizing high-frequency signal frequencies due to changes in impedance caused by varying shapes of radiating elements and adjacent components, leading to energy loss and the need for complex impedance matching circuits.
Innovation Solution
A frequency stabilization circuit with primary-side and secondary-side series circuits using reactance elements, achieving high electromagnetic field coupling to stabilize frequencies and reduce insertion loss, while allowing for impedance matching independent of radiating element shapes and component positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a ground plate in a casing is used as a radiating element to reduce terminal size, then the size of the mobile communication terminal is reduced, but the impedance of the radiating element changes in accordance with the shapes of the ground plate and casing and the position of adjacent metal bodies, requiring complex impedance matching circuits
Solution Approach 1:
The patent introduces a frequency stabilization circuit as an intermediary component between the feeding circuit and the radiating element. This circuit includes reactance elements (inductors and capacitors) that act as mediators to compensate for impedance variations caused by changes in the radiating element's shape and position, thereby stabilizing the resonant frequency without requiring complex impedance matching circuits for each model variation.
Solution Approach 2:
The patent employs reactance elements with adjustable parameters (inductance and capacitance values) to dynamically compensate for impedance changes. By changing the parameters of these reactance elements based on the specific configuration of the radiating element and adjacent components, the system maintains stable frequency characteristics across different terminal designs and component positions.
2Adaptability or versatility
If the impedance of the radiating element changes due to positional relationship between casings in folding-type and slide-type terminals, then a control circuit for controlling impedance is needed, but this increases device complexity and energy loss
Solution Approach 1:
The frequency stabilization circuit serves as an intermediary that passively compensates for impedance changes without requiring active control circuits. The reactance elements automatically adjust the overall impedance by counteracting the variations caused by changing positional relationships between casings, eliminating the need for complex control circuits while maintaining adaptability.
Solution Approach 2:
The frequency stabilization circuit provides self-service by automatically compensating for impedance variations through its inherent reactance elements. The circuit does not require external control signals or power consumption for active regulation; instead, it inherently maintains frequency stability through the passive electrical characteristics of its components, reducing both device complexity and energy loss.
3Loss of energy
If impedance matching is designed for each model to minimize energy loss, then energy loss is minimized, but the design complexity and time increase due to varying shapes and component positions
Solution Approach 1:
The frequency stabilization circuit provides a universal solution that can be applied across multiple terminal models with different radiating element configurations. The same basic circuit topology with appropriately selected reactance element values maintains optimal impedance matching and minimizes energy loss for various ground plate shapes and adjacent component positions, eliminating the need for custom impedance matching designs for each model.
Solution Approach 2:
Instead of redesigning the entire impedance matching circuit for each model, the patent allows for parameter changes in the reactance elements (inductance and capacitance values) to adapt to different configurations. This approach maintains minimal energy loss while significantly reducing design time, as only component parameter selection is required rather than complete circuit redesign.
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 effectively stabilizes high-frequency signal frequencies with minimal energy loss and reduced insertion loss, enabling efficient transmission and reception regardless of the radiating element shapes and component positions, and allows for flexible impedance matching.
Implementation Method 1
A frequency stabilization circuit with primary-side and secondary-side series circuits using reactance elements, achieving high electromagnetic field coupling to stabilize frequencies and reduce insertion loss
Data Source
AI summary
A frequency stabilization device includes a first radiating element, a second radiating element, a feeding circuit connected to the first and second radiating elements, and a frequency stabilization circuit disposed between the feeding circuit and the first radiating element. The frequency stabilization circuit includes a primary-side series circuit connected to the feeding circuit and a secondary-side series circuit coupled to the primary-side series circuit via an electric field or a magnetic field. A first inductance element and a second inductance element are connected in series to each other, and a third inductance element and a fourth inductance element are connected in series to each other. The first and third inductance elements are coupled to each other, and the second and fourth inductance elements are coupled to each other.