Multi-band Antenna Matching Circuit for Emergency Radio Interoperability
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Solution Overview
Problem
Emergency communication systems face interoperability issues due to radios being limited to single frequency bands, requiring multiple devices for communication among different agencies, which complicates information sharing during emergencies.
Innovation Solution
A handheld radio with a single radiator and an antenna matching unit that filters and transforms impedance to match multiple frequency bands, enabling communication across VHF, UHF, 700 MHz, and 800 MHz bands using a reactive circuit and S-parameter measurement for efficient impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single handheld radio is used for multiple frequency bands, then interoperability and communication efficiency are improved, but impedance matching across different bands becomes more difficult
Solution Approach 1:
The patent implements a universal antenna system where a single radiator and matching network serve multiple frequency bands (VHF, UHF, 700 MHz, 800 MHz). The antenna assembly is designed to provide adequate radiation resistance and impedance match across all bands simultaneously, eliminating the need for separate antennas for each band and enabling one radio to communicate with all agencies.
Solution Approach 2:
The patent introduces an antenna matching unit as an intermediary component between the radiator and the radio circuitry. This matching unit includes reactive circuits and filtering elements that transform and adapt the impedance across different frequency bands, serving as a mediator that resolves the impedance mismatch problem between the single antenna and multiple frequency requirements.
2Device complexity
If multiple single-band radios are used for different frequency bands, then impedance matching is simplified, but device portability and ease of operation deteriorate
Solution Approach 1:
The patent merges multiple single-band antenna systems into a single multi-band antenna assembly. By combining the radiator, matching networks, and filtering circuits into one integrated structure, the patent reduces the number of separate devices users must carry while maintaining adequate performance across all frequency bands.
3Weight of moving object
If a single radiator is used for multiple frequency bands, then device size and weight are reduced, but maintaining adequate radiation resistance across all bands becomes more difficult
Solution Approach 1:
The patent employs parameter changes in the matching network components (inductors, capacitors, resistors) to optimize the radiation resistance and impedance characteristics for each frequency band. The matching unit is designed with adjustable and selectable components that can be configured to provide adequate radiation resistance across VHF, UHF, 700 MHz, and 800 MHz bands while maintaining a compact form factor.
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
Enables seamless communication across multiple frequency bands with a single device, enhancing interoperability among emergency responders and improving communication efficiency and battery life while maintaining comparable antenna gain to existing narrow-band antennas.
Implementation Method 1
transform an impedance between the radiator and the antenna connector to match an impedance between the transceiver and the antenna connector for each of the multiple frequency bands
Implementation Method 2
comprises a reactive circuit to filter the communications and transform an impedance
Data Source
AI summary
A device for multiple band frequency communication may include a chassis, a transceiver for receiving and transmitting voice and data communications over any one of multiple frequency bands, an antenna assembly comprising a single radiator and an antenna matching unit, and an antenna connector provided on the chassis for mounting the antenna assembly to the device and connecting the antenna assembly to the transceiver via a transmission line, wherein the antenna matching unit is provided between the radiator and the antenna connector and comprises a reactive circuit to filter the communications and transform an impedance between the radiator and the antenna connector to match an impedance between the transceiver and the antenna connector for each of the multiple frequency bands. A method and system is disclosed for communicating voice and data communications over multiple frequency bands.