Antenna State Determining Circuit Using Oscillation Frequency
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Solution Overview
Problem
Existing antenna state monitoring devices require transmission signals to detect antenna states and struggle with accuracy across wide frequency bands, especially when transmission power is high, which can damage detection circuits.
Innovation Solution
An antenna state determining circuit that measures oscillation frequency changes in a feedback circuit to differentiate between normal, open-circuit, and short-circuit states, using an LC or RC oscillation circuit, allowing for accurate determination without a transmission signal and reducing circuit damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If transmission signal is used to detect antenna state, then detection method is simple, but detection cannot be performed without transmission signal and high power may damage circuits
Solution Approach 1:
The patent applies preliminary action by performing antenna state detection using an oscillation circuit before transmission signal generation. The oscillation circuit measures impedance characteristics in advance to determine antenna connection status, preventing damage to high-power transmission circuits while enabling detection without requiring actual transmission signals.
Solution Approach 2:
The patent introduces an oscillation circuit as an intermediary device between the antenna and the transmission system. This intermediary circuit uses low-power oscillation signals to probe antenna impedance characteristics, serving as a safe mediator that enables detection without exposing sensitive circuits to high-power transmission signals that could cause damage.
2Measurement precision
If transmission signal configuration is changed to improve detection accuracy, then detection precision improves, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by measuring oscillation frequency variations in the oscillation circuit to detect antenna impedance changes. Instead of complex transmission signal configurations, the system changes the measurement parameter to frequency, which naturally responds to impedance variations caused by different antenna states (connected, open-circuit, short-circuit), achieving accurate detection with simple circuitry.
3Adaptability or versatility
If wide frequency band is used for transmission, then communication versatility improves, but accurate antenna state grasping becomes difficult
Solution Approach 1:
The patent extracts the antenna state detection function from the wideband transmission system by using a separate oscillation circuit operating at a specific frequency. This extraction allows the main transmission system to maintain wide frequency band versatility while the dedicated oscillation circuit provides accurate antenna state detection at its operating frequency, independent of transmission bandwidth requirements.
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
Enables accurate and reliable antenna state determination with minimal influence from transmission signal configurations, preventing circuit damage from high-power transmission signals and simplifying the antenna tuner design.
Implementation Method 1
an oscillation circuit which generates oscillation signals at different frequencies according to impedance characteristics of a feedback circuit
Implementation Method 2
impedance characteristics of a feedback circuit
Data Source
Figure 1
Figure 2A~2C
Figure 3
AI summary
An antenna validity state determining circuit (20) for determining a validity state of an antenna (110) of a wireless communicator (100) is provided, which includes an oscillation circuit (21) having a feedback circuit and an oscillation frequency different from a frequency of a communication signal of the wireless communicator (100), an antenna connector (22) configured to switch a connection state of the antenna (110) between a first connection state in which the antenna (110) is disconnected from the feedback circuit, and a second connection state in which the antenna (110) is connected to the feedback circuit, a frequency measuring module (23) configured to measure a first frequency (f1) of the oscillation frequency when the connection state is the first connection state and a second frequency (f2) of the oscillation frequency when the connection state is the second connection state and a validity state determining module (24) configured to determine the validity state of the antenna (110) based on the first frequency (f1) and the second frequency (f2).