Multiband Antenna System With Protruding Radiating Element
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Solution Overview
Problem
Conventional antenna systems for wireless handheld devices face challenges in achieving multi-frequency operation with enhanced radioelectric performance, robustness, and reduced interaction with users, due to limitations in impedance bandwidth and sensitivity to external factors, especially in devices with limited height and slim designs.
Innovation Solution
The antenna system incorporates a radiating element that protrudes beyond the ground plane layer, with a matching and tuning system to adjust impedance, and a radiator contour design that optimizes the geometry for efficient operation in multiple frequency regions, reducing the size and enhancing integration within the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the antenna system uses a conventional planar design within the device, then the device height can be reduced, but the impedance bandwidth and radioelectric performance are limited
Solution Approach 1:
The radiating element is designed to protrude beyond the ground plane layer in the vertical dimension, transforming the conventional planar antenna configuration into a three-dimensional structure. This dimensional change enables the antenna to achieve broader impedance bandwidth and superior radioelectric performance while maintaining a compact device height, as the protruding element utilizes vertical space rather than requiring increased planar area
2Adaptability or versatility
If the antenna system is designed for multi-frequency operation, then the radioelectric performance is enhanced, but the device size increases
Solution Approach 1:
The antenna system employs a universal radiating element design that can operate across multiple frequency regions (including GSM 900/1800, UMTS, and other cellular standards) through a single integrated structure. The protruding element configuration and associated matching networks enable this single antenna to fulfill multiple frequency band requirements, eliminating the need for separate antennas for each frequency band and thereby reducing the overall antenna system volume
Solution Approach 2:
The antenna system utilizes variable matching networks with adjustable electrical parameters (inductance and capacitance values) to adapt the impedance characteristics of the radiating element across different frequency regions. By dynamically adjusting these electrical parameters, the antenna maintains optimal performance across multiple frequencies without requiring physical reconfiguration or increased size
3Adaptability or versatility
If the radiating element protrudes beyond the ground plane layer, then the impedance bandwidth increases, but the device complexity increases
Solution Approach 1:
The antenna system is segmented into distinct functional modules: the protruding radiating element, the ground plane layer, and separate matching networks. This segmentation allows each component to be independently optimized and assembled, simplifying the manufacturing process and reducing assembly complexity despite the three-dimensional structure. The modular design enables straightforward integration into the device housing without requiring complex tooling or assembly procedures
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
This solution enables wireless handheld devices to operate in multiple frequency regions with improved radioelectric performance, increased robustness, and reduced interaction with users, while maintaining a compact design suitable for slim devices.
Implementation Method 1
an antenna system capable of operation in a plurality of frequency regions of the electromagnetic spectrum with enhanced radioelectric performance
Data Source
AI summary
A wireless handheld or portable device includes an antenna system operable in a first frequency region and a higher, second frequency region. The antenna system comprises an antenna structure, a matching and tuning system, and an external input/output (I/O) port. The antenna structure comprises at least one radiating element including a connection point, a ground plane layer including at least one connection point, and at least one internal I/O port. At least one radiating element of the antenna structure protrudes beyond the ground plane layer. The antenna structure features at any of its internal I/O ports when disconnected from the matching and tuning system an input return loss curve having a minimum at a frequency outside the first frequency region of the antenna system. The matching and tuning system modifies the impedance of the antenna structure and provides impedance matching to the antenna system in the first and second regions.