Terminal Antenna Choke Layout for Metal-Backed Radiation Gaps
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Solution Overview
Problem
Electronic devices with all-metal back covers and high screen-to-body ratio displays face challenges in antenna radiation performance due to non-uniform gain distribution and poor radiation efficiency, leading to insufficient wireless communication capabilities.
Innovation Solution
Incorporating a choke structure near the antenna, such as an L-shaped gap, to suppress traveling wave currents and optimize the antenna's maximum gain, thereby improving radiation performance and reducing power spectral density and equivalent isotropic radiated power abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the antenna radiates only through a gap between the display screen and back cover, then the antenna structure is simple, but the radiation performance is poor and gain distribution is non-uniform
Solution Approach 1:
The antenna structure is segmented into multiple independent radiating elements (first radiating element, second radiating element, third radiating element) with different orientations. Each element radiates in different spatial directions, collectively achieving uniform omnidirectional radiation performance while maintaining structural simplicity.
Solution Approach 2:
The patent transitions from single-gap radiation to multi-dimensional radiation by adding radiating elements in different spatial orientations (horizontal, vertical, inclined). This multi-dimensional arrangement enables the antenna to radiate uniformly in all directions through the gap between display and back cover.
2Area of stationary object
If the screen-to-body ratio is increased, then the display area is enlarged, but the radiation performance deteriorates due to limited radiation gap
Solution Approach 1:
The radiating structure is divided into multiple independent elements that can be distributed within the limited space created by high screen-to-body ratio design. Each element contributes to overall radiation performance, ensuring adequate wireless communication capability despite reduced radiation gap area.
Solution Approach 2:
The patent utilizes multi-dimensional spatial arrangement of radiating elements to maximize radiation efficiency within the constrained gap area. By orienting elements in different directions (horizontal, vertical, inclined), the antenna achieves omnidirectional radiation coverage without requiring increased physical gap area.
3Shape
If the all-metal back cover is used, then the appearance quality is improved, but the antenna radiation is blocked and performance deteriorates
Solution Approach 1:
The gap between the display assembly and metal back cover serves as an intermediary radiation channel. Multiple radiating elements are positioned to utilize this gap as their radiation path, allowing electromagnetic waves to pass through the gap without being blocked by the metal back cover, thus maintaining both aesthetic appearance and radiation performance.
Solution Approach 2:
The patent exploits the three-dimensional space within the device, using the gap between display and back cover as a radiation dimension. By arranging radiating elements to radiate through this gap in multiple directions, the design overcomes the blocking effect of the all-metal back cover while preserving its aesthetic benefits.
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 choke structure enhances the antenna's radiation efficiency, achieving a more balanced gain distribution and improved overall radiation performance while maintaining high conduction power, thus supporting better wireless communication functions.
Implementation Method 1
a traveling wave current generated by the MNG antenna is suppressed
Implementation Method 2
the gap can radiate autonomously, and therefore a radiation performance of the MNG antenna can be improved
Data Source
AI summary
A terminal antenna and an electronic device, which relate to the field of antenna technologies. By adding a choke structure, optimization of a maximum gain of an original antenna is implemented, and in addition. A specific solution is as follows: the terminal antenna includes a first radiator and a second radiator. a first end of the first radiator is provided with a feed, and a second end of the first radiator is connected to a reference ground; the first radiator is provided with a gap that runs through the first radiator, the gap is in an interdigitated structure, and there are at least two gaps; and the second radiator is arranged on a side of the first radiator, the second radiator is L-shaped, the second radiator and the reference ground enclose an inverted L-shaped first gap.