Controllable Matching Apparatus for RF Impedance Tuning
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Solution Overview
Problem
Existing mobile communication devices face challenges in maintaining efficient data transmission across various frequency ranges due to narrow frequency spectrum limitations and sensitivity to environmental influences, leading to increased power consumption, reduced efficiency, and higher production costs.
Innovation Solution
A transmitting and receiving arrangement with integrated control for radio-frequency antennas and power amplifiers, utilizing a controllable matching apparatus to directly match internal impedances without the need for additional transformation circuits, allowing for frequency tuning and impedance compensation, thus enabling broadband operation across multiple mobile radio standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standardized 50 ohm interfaces and transformation circuits are used to connect power amplifier and antenna, then impedance matching is achieved within narrow frequency range, but signal losses increase and power efficiency decreases outside this range
Solution Approach 1:
The patent implements a dynamic impedance matching solution by replacing fixed 50 ohm transformation circuits with a controllable matching apparatus that actively adjusts impedance parameters. The system uses control circuits to dynamically modify the matching network configuration based on operating frequency and antenna conditions, enabling continuous optimization of impedance match across broad frequency ranges and eliminating signal losses associated with fixed matching.
Solution Approach 2:
The invention changes the fundamental parameter approach from fixed 50 ohm standardization to variable impedance matching. The controllable matching apparatus modifies impedance parameters (resistance, reactance) in real-time based on frequency and environmental conditions, allowing the system to adapt to different frequency ranges and antenna states rather than relying on fixed transformation circuits designed for narrow bandwidth operation.
2Ease of manufacture
If fixed transformation circuits are used for impedance matching, then connection between power amplifier and antenna is simplified, but adaptability to different frequency ranges and environmental influences is reduced
Solution Approach 1:
The controllable matching apparatus serves multiple functions: it provides impedance matching across broad frequency ranges, compensates for environmental influences on antenna impedance, and adapts to different antenna geometries. This single multi-functional device replaces multiple fixed transformation circuits that would be needed for different frequency bands, simplifying the overall system while enhancing versatility.
Solution Approach 2:
The system incorporates feedback mechanisms where control circuits monitor impedance conditions and automatically adjust the matching apparatus configuration. This closed-loop control enables the system to maintain optimal matching across varying frequencies and environmental conditions without manual intervention, combining ease of manufacture with high adaptability.
3Reliability
If margin is planned in transmitting arrangement design to satisfy entire specification, then reliability across different conditions is improved, but power consumption increases and efficiency decreases
Solution Approach 1:
Instead of designing for worst-case margins across all conditions, the system dynamically adjusts impedance matching to optimal values for current operating conditions. This eliminates the need for excessive power margins in the amplifier design, as the adaptive matching ensures efficient power transfer regardless of frequency or environmental variations, reducing overall power consumption while maintaining reliability.
4Adaptability or versatility
If multiple antennas with different resonant frequencies are used, then coverage of different mobile radio standards is improved, but device complexity and production costs increase
Solution Approach 1:
The controllable matching apparatus enables a single antenna to serve multiple mobile radio standards by dynamically adjusting its impedance match across broad frequency ranges. This eliminates the need for multiple dedicated antennas and their associated switching networks, reducing device complexity while maintaining coverage of GSM, WCDMA, and other standards through adaptive impedance control.
Data Source
AI summary
In a transmitting arrangement a power amplifier is coupled to a radio-frequency antenna arrangement via a controllable matching apparatus. This allows direct impedance transformation of the output of the power amplifier to the input of the radio-frequency antenna arrangement. There is no need for transformation to the 50 ohm standard. The power amplifier, matching apparatus and a control circuit for controlling the impedance of the matching apparatus form a functional unit, which is advantageously in the form of a monolithically integrated structure in a semiconductor body. A receiving arrangement is produced in the same way, comprising an antenna, a filter device and a matching apparatus connected between them.