Multi-Band Diversity Antenna Without Matching Circuits for Medical Links
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Solution Overview
Problem
Medical devices and their communicators face challenges in communicating using different wireless radio frequency frequencies and protocols due to regulatory variations across countries, often requiring multiple antennas and impedance matching circuitry, which complicates design and functionality.
Innovation Solution
The design of a multi-band diversity antenna system with conductive strip segments of varying lengths, configured to operate across multiple frequency bands without the need for impedance matching circuitry, utilizing a flexible substrate and bends to provide polarization and directional diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antennas and impedance matching circuitry are used to support different frequency bands, then communication reliability across regulatory jurisdictions is improved, but device complexity increases
Solution Approach 1:
The antenna structure is designed to serve multiple frequency bands (MICS, ISM, Wi-Fi) simultaneously through a single unified design. The conductive strips are configured with specific length relationships to resonate at multiple frequencies, allowing one antenna to replace what would traditionally require multiple separate antennas and matching circuits for different regulatory regions
Solution Approach 2:
Multiple antenna functions are merged into a single integrated structure. The patent combines elements that would traditionally be separate (multiple antennas for different bands) into one unified antenna system with conductive strips arranged to provide multiple resonance frequencies, thereby reducing overall device complexity while maintaining multi-band capability
2Adaptability or versatility
If traditional multi-antenna systems are used for different frequency bands, then frequency band coverage is improved, but manufacturing complexity increases
Solution Approach 1:
The antenna is divided into discrete conductive strip segments with specific length relationships. These segments can be independently configured to resonate at different frequencies, allowing the structure to be manufactured as modular elements that are then assembled or connected to form the complete multi-band antenna system
Solution Approach 2:
The antenna design utilizes parameter relationships (specific length ratios between conductive strips) to achieve multiple resonance frequencies. By changing the lengths of conductive strip segments according to defined relationships, the same basic structure can be tuned to operate across MICS, ISM, and Wi-Fi bands without requiring different physical antenna designs
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 efficient wireless communication across various frequency bands, such as MICS, ISM, and Wi-Fi, simplifying the design of external medical communicators and reducing metal frame effects, thereby enhancing communication reliability and flexibility.
Implementation Method 1
The first conductive strip segment is configured to provide a first specified operating frequency range at or near a fundamental resonance mode corresponding to the first length plus the third length, and the second conductive strip segment is configured to provide a second, higher, specified operating frequency range at or near a fundamental resonance mode corresponding to the second length plus the third length
Data Source
AI summary
An antenna for electrical coupling to a wireless communication circuit includes a first conductive strip segment having a first length, a second conductive strip segment having a second length different from the first length and coupled to the first conductive strip segment at a feed point to be electrically coupled to the drive node, and a third conductive strip segment having a third length less than both the first length and the second length. A first end of the third conductive strip is coupled to the feed point and a second end is coupled to circuit ground. The first conductive strip segment provides a first specified operating frequency range at a fundamental resonance mode corresponding to the first length plus the third length, and the second conductive strip segment provides a second specified operating frequency range at a fundamental resonance mode corresponding to the second length plus the third length.