Antenna System with Dual-Function RX Elements for TX Failure
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Solution Overview
Problem
TETRA base stations lack a backup for their transmission antennas, leading to potential communication disruptions and safety risks in case of TX antenna failure.
Innovation Solution
An antenna system with a monitoring circuit and switching circuit that allows dual-function RX antennas to switch from receiving to transmitting mode in case of TX antenna failure, ensuring continuous communication by connecting their second antenna elements to the TX port.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single omnidirectional TX antenna is used in a TETRA base station, then the device complexity is reduced and the system is easier to operate, but the reliability deteriorates because there is no backup antenna and communication is disrupted when the TX antenna fails
Solution Approach 1:
The RX antenna elements are designed to perform dual functions: primarily receiving signals during normal operation, and alternatively transmitting signals when the main TX antenna fails. The switching circuit enables these antenna elements to be reassigned from receiving-only function to transmitting function, making the antenna system multi-functional and improving reliability without adding external backup antennas
Solution Approach 2:
The system pre-configures multiple RX antenna elements that are capable of functioning as TX antennas, and pre-establishes the switching circuitry needed for rapid reassignment. When failure is detected, the system can immediately switch functions without requiring time-consuming reconfiguration or replacement of antenna components
2Reliability
If backup TX antennas are added to ensure continuous communication, then the reliability is improved, but the device complexity and number of antenna components increase
Solution Approach 1:
Instead of adding dedicated backup TX antennas, the system makes existing RX antenna elements multi-functional by enabling them to transmit when needed. The switching circuit connects these dual-function antenna elements to the TX port upon detection of TX antenna failure, providing backup transmission capability using existing hardware resources
Solution Approach 2:
The system merges the transmitting and receiving antenna functions into a single integrated antenna system. The same physical antenna elements serve both TX and RX roles depending on operational needs, eliminating the need for separate backup antenna components and reducing overall system complexity while maintaining reliability
3Adaptability or versatility
If RX antennas are configured with dual antenna elements, then the ability to take over transmission duties is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
Each RX antenna is divided into multiple independent antenna elements that can be individually controlled and switched. This segmentation allows specific elements to be activated for transmission while others continue receiving, providing flexible adaptability. The modular element structure also simplifies manufacturing compared to designing entirely new dual-function antenna components
Data Source
AI summary
A system includes: a TX port and a RX port; an omnidirectional TX antenna connected to the TX port; a plurality of RX antennas connected to the RX port, wherein each RX antenna comprises a first antenna element and a second antenna element; a monitoring circuit connected to the TX antenna; a switching circuit connected to the second antenna element of each RX antenna; and a processor connected to the monitoring circuit and to the switching circuit. The monitoring circuit monitors a status of the TX antenna. In response to a failure of the TX antenna detected by the monitoring circuit: the monitoring circuit notifies the processor of the failure; and the processor controls the switching circuit to switch the second antenna element of each RX antenna to be connected to the TX port. When the failure is not detected, the second antenna element of each RX antenna is disconnected from the TX port.