Reactance Switch for Millimeter Wave Signal Loss Reduction
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Solution Overview
Problem
High-frequency switches in the millimeter wave band suffer from significant signal loss and noise due to resistance components, leading to decreased signal gain and heat-generated noise in absorptive switches.
Innovation Solution
A high-frequency switch design utilizing a reactance switch with multiple reactance circuits in cascade, where at least one circuit is variable, allowing control of the passband through a control signal, eliminating resistance-related losses and noise by using reactance changes for switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resistance components are increased to disconnect input and output for high-frequency signal, then disconnection performance is improved, but insertion loss increases and signal level decreases
Solution Approach 1:
The invention changes the switching mechanism from resistance-based to reactance-based. By using variable reactance circuits (inductors or capacitors) whose reactance changes with control voltage, the switch achieves disconnection through reactive impedance rather than resistive attenuation, eliminating insertion loss while maintaining disconnection performance
Solution Approach 2:
The invention substitutes the resistive switching mechanism with a reactance-based mechanism. Instead of using resistors to absorb or attenuate signals for switching, the patent uses variable reactance circuits that present high or low reactive impedance to control signal flow, replacing the harmful resistive effect with a non-dissipative reactive effect
2Stability of the object's composition
If resistance components are used for switching in absorptive switch, then stable operation is provided, but heat is generated causing noise generation
Solution Approach 1:
The invention replaces the absorptive resistive switching mechanism with a reactance-based switching mechanism. By using variable inductors or capacitors instead of resistors, the switch achieves stable operation through reactive impedance changes without signal absorption, thereby eliminating heat generation and associated noise
Solution Approach 2:
The invention changes the physical parameter used for switching from resistance to reactance. By controlling the reactance value (through voltage-controlled inductors or capacitors) rather than resistance, the system achieves stable switching operation without the heat generation that occurs in resistive absorptive switches
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 high-speed, low-loss switching with minimal noise in high-frequency bands by using reactance changes instead of resistance, providing stable operation and reduced heat-related noise.
Implementation Method 1
at least one of the reactance circuits is a variable reactance circuit having a reactance which changes in response to a control signal input from the outside so that the passband of the variable reactance circuit changes
Data Source
AI summary
A high-frequency switch includes an input interface configured to receive a high-frequency signal; an output interface configured to output the high-frequency signal to outside; and a reactance switch inserted between the input interface and the output interface. The reactance switch includes a plurality of reactance circuits connected in a cascade arrangement between the input interface and the output interface. Each of the plurality of reactance circuits is configured to form a common passband for the high-frequency signal based on a reactance of a respective predetermined values, and at least one of the reactance circuits is a variable reactance circuit having a reactance which changes in response to a control signal input from the outside so that the passband of the variable reactance circuit changes.