Integrated Antenna Elements for Inter-Frequency Isolation
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Solution Overview
Problem
As terminal devices shrink in size, inter-frequency antennas experience increased mutual interference due to limited space, leading to performance deterioration and communication quality issues, and existing solutions like cascaded filters increase costs and volume, hindering miniaturization.
Innovation Solution
The implementation of low-frequency and high-frequency antenna elements with integrated short-circuit and open-circuit transmission lines, respectively, to suppress inter-frequency signals, improving isolation and efficiency while maintaining a simple structure and reducing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cascaded filter is used to suppress inter-frequency signals, then isolation between antenna elements is improved, but device volume and cost increase
Solution Approach 1:
The patent combines the filtering function with the ground plane structure by integrating a slot into the ground plane. This merged structure serves both as the grounding element and as the frequency-selective filter, eliminating the need for separate cascaded filter components and reducing overall antenna volume.
Solution Approach 2:
The ground plane is designed to perform multiple functions simultaneously: providing electrical ground reference, suppressing inter-frequency signals through the integrated slot structure, and maintaining antenna radiation performance. This multi-functional design eliminates dedicated filter components.
2Reliability
If cascaded filter is used to suppress inter-frequency signals, then isolation between antenna elements is improved, but manufacturing cost increases
Solution Approach 1:
The filtering function is merged into the ground plane structure, which is already a necessary component of the antenna system. This integration eliminates the need for additional filter components and their associated assembly processes, thereby reducing manufacturing complexity and cost.
Solution Approach 2:
The ground plane structure is designed to provide both electrical grounding and frequency-selective filtering functions. This multi-functionality reduces the total component count and simplifies the manufacturing process by eliminating separate filter assembly steps.
3Volume of stationary object
If antenna size is reduced to enable terminal device miniaturization, then device volume is reduced, but mutual interference between inter-frequency antennas increases
Solution Approach 1:
The ground plane incorporates a slot with specific dimensional characteristics designed to create frequency-selective impedance. This localized structural modification creates strong frequency discrimination at the ground plane level, suppressing inter-frequency coupling even when antennas are placed in close proximity for miniaturization.
Solution Approach 2:
The integrated slot structure in the ground plane pre-establishes frequency-selective rejection characteristics that actively counteract inter-frequency interference before it can propagate between antennas. This preliminary anti-action is built into the antenna structure itself, enabling close spacing without excessive mutual interference.
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 proposed antenna elements enhance isolation and operating efficiency by suppressing inter-frequency signals without additional components, facilitating miniaturization and lowering costs, thereby improving communication quality and reducing the overall device size.
Implementation Method 1
One end of the short-circuit transmission line is connected to a positive electrode of the low-frequency antenna element, and the other end is connected to a negative electrode of the low-frequency antenna element. The short-circuit transmission line suppresses an inter-frequency signal
Data Source
AI summary
A low-frequency antenna element, a high-frequency antenna element, and a terminal device are disclosed. The terminal device comprises at least one of the low-frequency antenna element or the high-frequency antenna element, the low-frequency antenna element and the high-frequency antenna element are alternately disposed at an interval.