Inductive RF Power Sampler for Broadband High-Power Monitoring
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Solution Overview
Problem
Existing radio frequency (RF) signal sampling technologies face limitations in bandwidth and power handling capabilities, making them unsuitable for broadband, high-power communication systems where efficient monitoring and sampling of RF signals are required.
Innovation Solution
The development of power samplers that utilize inductive circuits with coupling and balun components to sample differential or single-ended signals, allowing for the extraction of a sample signal with a magnitude proportional to the inductance impedance, thereby enabling efficient signal tapping and processing without significantly affecting the main signal's power level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a small capacitor, probe, or resistor is used to tap the transmission line, then the device complexity is reduced, but the bandwidth and power handling capabilities are limited
Solution Approach 1:
The patent introduces an inductance element as an intermediary component between the transmission line and the sampling detector. This inductance, with its specific impedance characteristic (preferably greater than the source impedance at the design frequency), acts as a mediator that enables broad bandwidth operation and high power handling while maintaining a relatively simple overall circuit structure. The inductance transforms the simple tap structure into a broadband, high-power capable sampler without requiring complex circuitry.
2Device complexity
If a simple capacitor or resistor tap is used, then the device complexity is minimized, but the signal sampling accuracy and consistency across frequency ranges deteriorates
Solution Approach 1:
The patent changes the key parameter of the sampling circuit from simple capacitive or resistive elements to an inductive element with specifically controlled impedance characteristics. By setting the inductance impedance to be greater than the source impedance at the design frequency, the circuit achieves consistent signal sampling across a broad frequency range. This parameter change transforms a simple structure into one that provides accurate and consistent measurements without requiring complex calibration or adjustment mechanisms.
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
The proposed solution allows for effective sampling of RF signals across a broad frequency range, providing a consistent sample signal level and enabling applications such as forward power monitoring and automatic leveling control, while maintaining minimal impact on the main signal's power level.
Implementation Method 1
The inductance has an inductance impedance at a design frequency of operation for the power sampler... outputting a single-ended sample signal having a magnitude proportional to the inductance impedance at the design frequency
Data Source
AI summary
A power sampler may include a sampling circuit interposed in one leg of a differential-signal circuit. An input balun may convert a single-ended signal from a signal source into a differential signal on first and second differential-signal input ports. An output balun may convert an output differential signal to a single-ended output signal to a signal load. The sampling circuit may include an inductance and a coupling circuit. The inductance may be an inductor and have an impedance higher than a source impedance. The coupling circuit, which may be a balun, is connected to the inductance and outputs a single-ended sample signal having a magnitude proportional to the inductance impedance at the design frequency. A second coupling-circuit output conducts an output differential signal and may be connected to the output balun.