High Frequency Switch with Reactance Matching for Power Loss Reduction
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Solution Overview
Problem
Conventional transmission/reception switching devices experience power loss and harmonic spurious emission during transmission, leading to battery life degradation and non-compliance with regulatory spurious emission limits, especially at high frequencies like 169 MHz.
Innovation Solution
The implementation of a transmission/reception switching device with a high frequency switch that includes a first and second reactance, along with semiconductor switches, which suppresses power loss and harmonic spurious emission by controlling the voltage applied to the high frequency switch, eliminating the need for diodes and optimizing impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If diodes are used for transmission/reception switching, then switching function is achieved, but power loss occurs during transmission
Solution Approach 1:
The patent changes the operating parameters of the diodes by applying reverse bias voltage during transmission to reduce forward conduction and minimize power loss, while maintaining the switching function through controlled biasing states
2Object-generated harmful factors
If diodes are used for transmission/reception switching, then switching function is achieved, but harmonic spurious emission increases
Solution Approach 1:
The patent applies preliminary reverse bias to the diodes before transmission occurs, preventing the nonlinear operation that generates harmonic spurious emission, while maintaining the ability to switch when needed
3Duration of action of moving object
If conventional switching device is used, then transmission/reception switching is achieved, but battery life decreases
Solution Approach 1:
The patent changes the biasing parameters of the switching diodes to operate in a low-power state during transmission by applying reverse bias, significantly reducing power consumption and extending battery life while maintaining switching capability
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 solution effectively reduces power loss during transmission, prolongs battery life, and minimizes harmonic spurious emission, ensuring compliance with regulatory standards for spurious emission levels.
Implementation Method 1
constants of the second inductor and the second capacitor having values for establishing matching under influence of a mismatch caused by the first reactance during signal reception
Implementation Method 2
a high frequency switch connected to an output end of one of the first inductor and the first capacitor at the predetermined node
Data Source
Figure 1
Figure 2
Figure 3A~3D
AI summary
A transmission/reception switching device 100 according to one embodiment of the present invention includes: a first reactance 2 including a first inductor 8 and a first capacitor 7, the first reactance 2 being connected between an antenna 17 and a transmission section 1 which outputs a signal; a second reactance 4 including a second inductor 15 and a second capacitor 14, the second reactance 4 being connected between a predetermined node 16 and a reception terminal 5; and a high frequency switch 3 connected to an output end of one of the first inductor 8 and the first capacitor 7 at the predetermined node 16. Constants of the second inductor 15 and the second capacitor 14 have values for establishing matching under influence of a mismatch caused by the first reactance 2 during signal reception.