Multi-Band Antenna for Portable Radios
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Solution Overview
Problem
Portable communication devices face challenges in achieving multi-band operation without increasing size or compromising performance, due to size constraints and the impracticality of multiple external antenna structures, which are cumbersome and prone to breakage in mission-critical settings.
Innovation Solution
A single antenna structure comprising a first radiator element, a second radiator element, and an RF transmission line embedded within a ground reference mass, allowing for simultaneous operation across multiple frequency bands by optimizing impedance matching and radiation patterns, thereby enabling reliable interoperability and improved communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate external antenna structures are used to cover multiple frequency bands, then operational bandwidth is improved, but device size and complexity increase
Solution Approach 1:
The patent combines multiple antenna functions into a single integrated antenna structure that supports multiple frequency bands (VHF, UHF, and 700/800 MHz) through one unified design, eliminating the need for multiple separate external antennas while maintaining multi-band operational capability
Solution Approach 2:
The single antenna structure is designed to perform multiple functions across different frequency bands simultaneously, making it a universal antenna solution that replaces multiple band-specific antennas with one multi-functional element
2Adaptability or versatility
If multiple separate external antenna structures are used, then multi-band operation is achieved, but ease of operation deteriorates due to encumbrance
Solution Approach 1:
By merging multiple antenna structures into one integrated unit, the device becomes more ergonomic and easier to handle, eliminating the encumbrance of multiple separate external antennas while preserving multi-band operational capability
3Adaptability or versatility
If lengthy external antenna structures are used, then operational bandwidth is improved, but reliability worsens due to susceptibility to breakage
Solution Approach 1:
The integration of multiple antenna functions into a single compact structure eliminates the need for lengthy external antennas, reducing susceptibility to breakage and damage while maintaining multi-band operational bandwidth through the unified design
4Device complexity
If a single antenna structure is used, then device size is reduced, but operational bandwidth may be limited
Solution Approach 1:
The single antenna structure incorporates multiple radiating elements and impedance transformation networks that enable it to operate across multiple frequency bands (VHF, UHF, and 700/800 MHz), making it a universal antenna that provides compact size without sacrificing operational bandwidth
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 solution provides a compact, rugged, and efficient multi-band antenna configuration that maintains optimal performance across VHF, UHF, and 7/800 MHz bands, ensuring reliable communication and interoperability for public-safety agencies while minimizing device size and weight.
Implementation Method 1
an RF transmission line embedded within or routed along the ground reference mass towards a second end of the RF transmission line, where a second radiator element is coupled to the second end of the RF transmission line
Data Source
AI summary
An antenna (100) enables improved multi-band operation for a portable communication device, such as a portable two-way radio. The antenna structure is formed of a first radiator element (104) fed through a single radio frequency (RF) feed port (118) and terminated on the input of a transmission line (108). The transmission line (108) is routed along a ground plane reference mass (102) towards a second radiator element (106). Applying the antenna structure to a radio embodiment, the first radiator element (104) is placed at a bottom side of a portable radio device, the first radiator element being fed through the single RF feed port and terminated on the input of the transmission line. The transmission line is routed along the ground plane reference mass towards the second radiator element placed on a top side of the portable radio.