Shared-Antenna RF Receiver Isolation During Transmitter Emission
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Solution Overview
Problem
In emitter/receiver devices sharing an antenna, the emitter's signal emission causes disturbances to the receiver, leading to voltage variations that can damage components, as conventional decoupling methods are insufficient.
Innovation Solution
The device includes a radio frequency stage with an amplifier device that can be connected or disconnected from the power source, using switches, baluns, capacitors, or transformers to isolate the receiver during emission, ensuring the receiver remains powered while protecting it from parasitic signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the antenna is decoupled from the receiver during emission, then the emitter can transmit signals without disturbing the receiver, but the receiver cannot protect itself from parasitic signals caused by the emitter
Solution Approach 1:
The invention divides the receiver into multiple independent amplifier stages (first stage and second stage). The first stage is connected to the antenna and can be independently disconnected during emission, while the second stage remains operational. This segmentation allows partial protection of the receiver without completely shutting down the receiving function.
Solution Approach 2:
The invention implements preliminary disconnection of the first amplifier stage from the power source before the emitter transmits signals. This preliminary action prevents the receiver from being affected by parasitic signals generated during emission, while maintaining the ability to quickly restore receiving functionality after emission ends.
2Productivity
If the receiver remains connected to the power source during emission, then the receiver can continue operating, but the receiver components can be damaged by voltage variations from parasitic signals
Solution Approach 1:
The receiver is segmented into multiple amplifier stages with independent power control. Only the first stage connected to the antenna is disconnected during emission, while the second stage and subsequent processing stages remain powered and operational. This allows continuous receiver operation with protected components.
Solution Approach 2:
The power disconnection is applied locally only to the first amplifier stage that is directly exposed to parasitic signals from the antenna. Other stages of the receiver maintain normal power supply and operation, ensuring that protection is applied precisely where needed without affecting overall receiver productivity.
3Object-generated harmful factors
If conventional decoupling methods are used, then the antenna can be isolated from the emitter, but the protection is insufficient and the receiver still receives damaging parasitic signals
Solution Approach 1:
The invention implements preliminary disconnection of the first amplifier stage power supply before emission begins. This preliminary action provides active protection against parasitic signals that conventional passive decoupling cannot prevent, while maintaining system readiness for quick resumption of receiving operations.
Solution Approach 2:
The invention converts the harmful effect of continuous power connection (exposure to parasitic signals) into a beneficial protective mechanism by implementing controlled power disconnection. The power supply itself becomes the protection mechanism when selectively disconnected, transforming a potential source of damage into a protective feature.
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 decouples the antenna from the receiver during emission, preventing signal interference and protecting the receiver's components, thereby enhancing the device's performance and preventing damage.
Implementation Method 1
a radio frequency stage allowing to amplify and shape the signal received by the antenna
Implementation Method 2
The two stages are coupled together via a balun
Implementation Method 3
The two stages are coupled together via a capacitor
Implementation Method 4
The two stages are coupled together via a transformer
Data Source
AI summary
A transmitter/receiver device include an antenna, a voltage source, a radio frequency receiver connected to the antenna and powered by the voltage source, a radio frequency transmitter connected to the antenna and powered by the voltage source, and a switch coupled to the antenna, the receiver and the transmitter and configured to couple/decouple the antenna from the transmitter or from the receiver. The antenna is shared between the transmitter and the receiver. The receiver includes a radio frequency stage that includes an amplifier device having an input coupled to the antenna. The amplifier device includes an amplifier switch configured to connect or disconnect the amplifier device from the voltage source.