Frame Antenna Capacitive Layout for Small-Clearance Radiation Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In electronic devices with a high screen-to-body ratio, the decreasing antenna clearance leads to reduced radiation efficiency, making it challenging to maintain over-the-air standards, especially in small form factor devices like full-screen mobile phones, where dielectric losses from plastic particles in the antenna structure significantly impact performance.
Innovation Solution
Incorporating a capacitor in series with the conventional antenna structure to evenly distribute the magnetic field and reduce the impact of dielectric losses, allowing for higher radiation efficiency without increasing antenna size or power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the antenna clearance is reduced to achieve a higher screen-to-body ratio, then the device form factor is improved, but the radiation efficiency of the antenna decreases
Solution Approach 1:
The patent introduces a capacitive component that changes the electrical parameters of the antenna system. By adding capacitance in series with the radiator, the resonant frequency and impedance characteristics are modified, which improves radiation efficiency in a compact antenna clearance environment without changing the physical dimensions of the antenna structure.
Solution Approach 2:
The capacitive component acts as an intermediary element between the radiator and the ground. This intermediate component modifies the electromagnetic field distribution and reduces the impact of dielectric losses from plastic particles, thereby improving radiation efficiency without requiring a larger antenna clearance.
2Reliability
If the conduction power and sensitivity of radio frequency are improved to compensate for OTA decrease, then the radiation efficiency is maintained, but the cost increases
Solution Approach 1:
The patent extracts and addresses the root cause of the radiation efficiency problem by introducing a capacitive component directly into the antenna structure. This approach isolates the solution to the antenna design itself, rather than requiring system-level compensations through increased conduction power or sensitivity improvements, thereby reducing overall device complexity and cost.
3Volume of moving object
If a conventional antenna structure is used in a small antenna clearance environment, then the device size is reduced, but the dielectric loss from plastic particles significantly impacts performance
Solution Approach 1:
By adding the capacitive component, the patent changes the electrical parameters of the antenna system to operate at an optimized resonant frequency. This parameter change reduces the sensitivity to dielectric losses from plastic particles in the antenna clearance, allowing the antenna to maintain high radiation efficiency in a compact volume.
Solution Approach 2:
The patent converts the harmful effect of dielectric losses into a beneficial outcome by using the capacitive component to reshape the electromagnetic field distribution. The field redistribution reduces the interaction with lossy plastic particles, effectively turning the presence of dielectric materials from a harmful factor into a non-critical element.
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 solution effectively enhances radiation efficiency by minimizing the effect of dielectric losses from plastic particles, improving antenna performance in compact devices while maintaining compatibility with various frequency bands.
Implementation Method 1
A first capacitive component is electrically connected between the first location of the frame and a first end of the radiator
Implementation Method 2
When the radiator resonates, a magnetic field formed between the radiator and the ground is evenly distributed and has a greater amplitude
Implementation Method 3
The frame between the first location and the second location is used as the radiator of the antenna structure
Data Source
AI summary
An electronic device includes: a ground, a frame, and an antenna structure. The antenna structure includes a radiator and a first capacitive component. The frame has a first location and a second location. The frame between the first location and the second location is the radiator of the antenna structure. A first slot is configured at the first location of the frame. The first capacitive component is electrically coupled between the first location of the frame and a first end of the radiator, or the first capacitive component is electrically coupled between a first end of the radiator and the ground. The first end of the radiator is an end that is of the radiator and that is at the first slot.