Built-in Antenna Segmented Metal Frame for Radiation Efficiency
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Solution Overview
Problem
Built-in antennas in portable electronic devices face challenges in maintaining radiation efficiency and bandwidth due to the presence of metal constructions, which also affect the device's mechanical robustness and appearance, as the devices become smaller and thinner.
Innovation Solution
A built-in antenna design featuring a first conductor for grounding and a second conductor for power feeding, with a separating element between them, and a metal construction that is partially cut to act as an extended ground and radiator, minimizing the influence of surrounding metal and enhancing capacitance for improved radiation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal construction is used to improve mechanical robustness and appearance, then mechanical strength and aesthetic quality are improved, but antenna radiation efficiency deteriorates due to interference with electromagnetic waves
Solution Approach 1:
The metal construction is segmented by cutting it at specific positions to create separation between the antenna and continuous metal structures. This segmentation reduces electromagnetic interference while maintaining the structural strength and aesthetic appearance of the metal frame.
Solution Approach 2:
The metal construction is selectively cut only at specific locations where it interferes with antenna radiation, while other portions of the metal construction are retained to maintain mechanical robustness and appearance. This local modification approach preserves overall structural integrity while improving antenna performance.
2Reliability
If the antenna is spaced further from metal construction to improve radiation efficiency, then antenna performance is improved, but the available space in compact devices is insufficient
Solution Approach 1:
By cutting the metal construction at strategic positions, the antenna can be placed closer to the metal frame without experiencing continuous electromagnetic interference. The segmented metal structure creates electromagnetic isolation zones that improve radiation efficiency within limited spatial constraints.
Solution Approach 2:
The cut portions of the metal construction act as electromagnetic intermediaries that isolate the antenna from harmful metal interference while maintaining physical proximity. This allows the antenna to operate efficiently even in compact spaces where full separation is not feasible.
3Reliability
If the thickness of the device is increased to ensure sufficient distance between antenna and metal construction, then antenna radiation efficiency is improved, but the device cannot maintain a slim form factor
Solution Approach 1:
The metal construction is cut at specific positions to create electromagnetic isolation without increasing device thickness. This segmentation allows the antenna to achieve sufficient electromagnetic separation from metal structures while maintaining the device's slim profile.
Solution Approach 2:
Instead of increasing thickness to achieve separation, the solution cuts the metal construction in the planar dimension to create electromagnetic isolation. This dimensional approach allows radiation efficiency improvement without compromising the slim form factor.
4Strength
If metal construction is connected to main ground to improve appearance and structure, then mechanical strength is improved, but radiation deterioration occurs due to induced currents in the metal
Solution Approach 1:
The continuous metal construction connected to ground is segmented by cutting it at specific positions. This segmentation interrupts the flow of induced currents that cause radiation loss, while the metal construction remains mechanically robust and aesthetically pleasing.
Solution Approach 2:
The metal construction that originally caused radiation harm through induced currents is transformed into a beneficial structure by strategic cutting. The same metal frame that provided structural support and appearance is now modified to reduce electromagnetic interference while maintaining its mechanical and aesthetic functions.
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 design significantly improves radiation efficiency and bandwidth while maintaining mechanical robustness and a slim form factor, preventing radiation property deterioration and allowing the metal construction to function as an effective antenna radiator.
Implementation Method 1
a separating element disposed between the first conductor and the second conductor to separate the first and second conductors
Implementation Method 2
enhancing capacitance for improved radiation properties
Implementation Method 3
allowing the metal construction to function as an effective antenna radiator
Data Source
AI summary
A built-in antenna of a portable terminal and a method of forming the same are provided. The built-in antenna includes a first conductor having a specific length and used for a ground, a second conductor disposed with a specific distance in parallel to the first conductor to couple with the first conductor and used for power feeding, and a separating element disposed between the first conductor and the second conductor to separate the first and second conductors. Accordingly, the built-in antenna may exhibit a smooth radiation property even if a metal construction is used in a device and thus may implement robustness improvement of the device and make the device slim and have an attractive outer appearance. In addition, a method of improving antenna efficiency may prevent deterioration of the radiation property of the antenna radiator of the related art by using simple processing, and the metal construction may be used as a radiator.