Antenna Tuning Circuit for Coarse-Step Resonance Detection
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Solution Overview
Problem
Existing radio wave receivers face difficulties in adjusting the antenna's resonance frequency to match a desired wave when the tuning circuit's adjustment interval is coarse, leading to challenges in detecting the optimal setting for efficient signal reception.
Innovation Solution
A radio wave receiver design that incorporates an oscillation generator, a tuning unit with discrete frequency variation capabilities, and a compensator to adjust the frequency characteristic of the oscillation signal, allowing for precise tuning of the antenna's resonance frequency by continuously varying the capacitance of the tuning circuit, even with coarse adjustment steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the tuning circuit uses discrete adjustment steps, then the device complexity is reduced, but the measurement precision of resonance frequency detection deteriorates
Solution Approach 1:
The patent introduces an oscillation signal as an intermediary to bridge the gap between discrete tuning steps and continuous frequency detection. The oscillation signal is injected into the antenna system and its response is measured to detect resonance conditions. This mediator enables precise resonance detection even when the tuning circuit itself has coarse discrete steps, resolving the contradiction between simple discrete tuning and precise frequency measurement
Solution Approach 2:
The system performs preliminary action by generating an oscillation signal at the antenna before final reception. This oscillation signal is used to probe the resonance characteristics of the antenna-tuning circuit system. By performing this preliminary oscillation and detection step, the system can identify the resonance frequency with high precision using simple discrete tuning steps, without requiring complex continuous adjustment mechanisms
2Device complexity
If the tuning circuit adjustment interval is coarse, then the device complexity is reduced, but the reception sensitivity deteriorates
Solution Approach 1:
The oscillation signal serves as a mediator that enables accurate resonance detection despite coarse tuning steps. By measuring the response of the oscillation signal at different discrete tuning positions, the system can precisely identify the resonance frequency and optimize reception sensitivity without requiring fine-adjustment mechanisms
Solution Approach 2:
The system uses feedback by measuring the response of the oscillation signal and using this information to determine the optimal tuning position. The detection unit measures the oscillation signal characteristics, and this measurement feedback guides the selection of the best discrete tuning setting, ensuring high reception sensitivity even with coarse adjustment intervals
3Reliability
If high-resolution tuning circuit adjustments are used, then the reception sensitivity is improved, but the processing time increases
Solution Approach 1:
The system performs preliminary oscillation and detection at discrete tuning positions to quickly identify the approximate resonance region. This preliminary action with simple discrete steps avoids the time-consuming process of fine scanning, while still achieving high reception sensitivity through the oscillation-based detection method
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 approach enables the radio wave receiver to effectively detect and adjust the antenna's resonance frequency to match the desired wave, improving reception sensitivity without the need for high-resolution tuning circuit adjustments, thus reducing processing time and circuit complexity.
Implementation Method 1
an oscillation generator for oscillating the antenna and a circuit portion of the tuning unit; a controller for generating an oscillation signal at the circuit portion by the oscillation generator
Implementation Method 2
a tuning unit that can discretely changing a frequency characteristic of the antenna
Data Source
AI summary
A radio wave receiver including an antenna for receiving a radio wave; a tuning unit that can discretely changing a frequency characteristic of the antenna; an oscillation generator that can oscillate the antenna and a circuit portion of the tuning unit; a reception processing section for extracting a signal of a desired wave out of a reception signal received from the antenna; a controller for generating an oscillation signal at the circuit portion by the oscillation generator, and switching a setting of the tuning unit to search a setting state of the tuning unit under which the oscillation signal is extracted by the reception processing section; and a compensator for applying a variation to a frequency characteristic of the oscillation signal or a frequency characteristic associated with signal extraction of the reception processing section when the controller searches the setting state.