Dis-engaging RF Test Point Circuit for Signal Loss Reduction
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Solution Overview
Problem
Broadband and hybrid fiber coax equipment experience undesired signal power loss due to directional couplers, even when RF test points are used infrequently, leading to constant signal power loss in the main RF signal path.
Innovation Solution
Implementing a dis-engaging test point circuit with an electronic or electromechanical switch that connects the main RF signal path to a test point structure only when a test probe is present, minimizing signal loss by maintaining the switch in an open position during normal operation and closing it when monitoring is required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a directional coupler is used to provide RF test point access, then test point functionality is available, but signal power loss in the main RF signal path increases
Solution Approach 1:
The patent applies the dynamics principle by making the test point connection dynamic rather than static. A switch is introduced that can change state between connected and disconnected, allowing the test point to be dynamically engaged or disengaged from the main RF signal path. This resolves the contradiction by enabling test point functionality only when needed, eliminating continuous signal power loss while maintaining accessibility when required.
Solution Approach 2:
The patent implements periodic action by enabling the test point connection only during specific periods when monitoring is required, rather than continuously. The switch transitions between open and closed states based on operational needs, creating a periodic pattern of connection and disconnection. This allows test point functionality to be available on demand while minimizing overall signal power loss in the main RF signal path.
2Reliability
If the test point is continuously connected to the main RF signal path, then monitoring capability is always available, but signal loss occurs at all times
Solution Approach 1:
The switch provides dynamic control over the test point connection, transitioning between connected and disconnected states. This dynamic behavior allows the system to maintain monitoring availability when needed (closed state) while eliminating signal loss during normal operation (open state), resolving the contradiction between continuous monitoring availability and continuous signal loss.
Solution Approach 2:
The patent extracts the test point connection from the main RF signal path by using a switch to isolate it. The test point functionality is separated and can be selectively engaged, removing the harmful effect of continuous signal loss while preserving the useful function of monitoring when required.
3Ease of operation
If the switch is closed to enable test point monitoring, then signal can be monitored, but signal loss increases in the main RF signal path
Solution Approach 1:
The switch enables dynamic control where the test point connection is established only when monitoring is required. The transition to closed state provides monitoring capability on demand, while the ability to return to open state eliminates continuous signal loss, resolving the contradiction between operational convenience and energy loss.
Data Source
AI summary
A test point circuit includes a main RF signal path (e.g., transmission line, lumped-element network, etc.), a test point RF signal circuit, a test point structure having a center conductor and corresponding grounded sleeve and being configured for connecting to a test probe for monitoring the RF signal carried through the main RF signal path, and a switch between the main RF signal path and the test point RF signal circuit. In the open position of the switch, the signal in the main RF signal path is prevented from propagating to the center conductor of the test point structure. In the closed position of the switch, the RF signal can propagate from the main RF signal path to the center conductor of the test point structure. The test probe mated to the test point structure can then measure or monitor the RF signal carried through the main RF signal path.