Antenna Extender Layout for Compact Wideband Device Antennas
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Solution Overview
Problem
Designing antennas for portable electronic devices that are compact, robust, and efficient in tight spaces while maintaining optimal performance across various frequency bands is challenging due to the conflicting requirements of size, mechanical robustness, and aesthetic appeal.
Innovation Solution
The integration of an antenna extender, a conductive member attached to the dielectric cover or support structure, which enhances the antenna's surface area and impedance bandwidth without increasing physical dimensions, allowing for improved radiation efficiency and robustness against suboptimal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna size is increased to improve radiation efficiency and impedance bandwidth, then the antenna performance is improved, but the antenna cannot fit within the compact portable device
Solution Approach 1:
The antenna extender is nested within the device housing structure, utilizing the existing internal space between the dielectric cover and the housing. The conductive member is positioned within the confined space without requiring additional external volume, effectively nesting the antenna extension functionality within the existing device boundaries.
Solution Approach 2:
Instead of extending the antenna in the traditional horizontal plane, the invention utilizes the vertical dimension by positioning the conductive member on or near the dielectric cover, which is located at the top surface of the device. This dimensional shift allows the antenna to achieve larger effective area without increasing the device's footprint.
2Adaptability or versatility
If the antenna elements are extended to cover more frequency bands, then the impedance bandwidth is improved, but the antenna occupies more space within the device
Solution Approach 1:
The conductive member serves multiple functions: it acts as an antenna extender for impedance matching across frequency bands, provides structural support on the dielectric cover, and can be integrated with the housing structure. This multi-functionality allows single structural element to fulfill multiple roles, reducing overall space requirements.
Solution Approach 2:
The invention changes the geometric parameters of the antenna system by introducing a conductive member with specific dimensional relationships (first dimension along longitudinal direction, second dimension perpendicular to it). By optimizing these parameters, the antenna achieves broader frequency coverage without proportional increase in space occupation.
3Reliability
If the antenna structure is made more complex to improve performance across all frequency bands, then the radiation efficiency is improved, but the device design becomes more difficult
Solution Approach 1:
The antenna extender functionality is merged with the existing device structures: the conductive member is integrated with the housing and dielectric cover, and the antenna feed is coupled to the peripheral structure. This merging approach allows performance improvement without adding separate, independent components that would increase design complexity.
Solution Approach 2:
The conductive member on the dielectric cover serves the antenna system by providing the necessary extension and impedance matching, while simultaneously serving as a structural element of the device. The dielectric cover itself provides mechanical support and electrical isolation, eliminating the need for additional dedicated antenna support structures.
4Length of moving object
If the antenna is designed to be compact to fit in portable devices, then the device portability is improved, but the antenna performance and robustness against suboptimal conditions deteriorate
Solution Approach 1:
The conductive member is pre-positioned on the dielectric cover during device assembly, establishing the antenna's electrical characteristics before the device is put into service. This preliminary configuration ensures that the antenna maintains optimal performance and robustness from the outset, compensating for the compact size constraints.
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 compact antennas with enhanced efficiency and robustness, maintaining performance in confined spaces without occupying additional space, and can be easily integrated with other device structures, improving radiation patterns and impedance bandwidth.
Implementation Method 1
A purpose of the conductive member, i.e. the antenna extender, is to enlarge the surface area where the electric field is distributed on. In other words, the antenna extender increases the antenna aperture for radiation.
Implementation Method 2
It will improve the chassis mode excitation at desired frequency band(s).
Data Source
AI summary
An electronic device comprises a housing having a first side and a second side, a dielectric cover (602) on said second side, and an electrically conductive peripheral structure along edges of said first and second sides. An antenna feed (601) is coupled to a portion (603) of said peripheral structure for using said portion (603) as a radiating antenna element. A conductive member (604, 804) is located on or underneath said dielectric cover (602). The purpose of the conductive member is to enlarge the surface area where the electric field is distributed on to increase the antenna aperture for radiation.