Antenna Assembly U-Shaped Groove Isolation
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Solution Overview
Problem
In miniaturized portable electronic devices, closely spaced antennas operating at the same resonant frequency band interfere with each other, resulting in low isolation between them.
Innovation Solution
An antenna assembly comprising two inverted-F antennas with an interconnecting portion featuring a U-shaped main groove that electrically connects the short-circuit and ground portions of each antenna, improving isolation by adjusting impedance matching and reducing size through supplementary grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between antennas is reduced to achieve miniaturization, then the device size is reduced, but the isolation between antennas deteriorates
Solution Approach 1:
An interconnecting portion with a U-shaped main groove is introduced as an intermediary structure between the first and second antennas. This groove structure acts as a mediator to manage electromagnetic field distribution, improving isolation between the closely spaced antennas while allowing them to maintain a compact arrangement within the device housing.
Solution Approach 2:
The patent modifies the electrical parameters of the antenna system by introducing the interconnecting portion with specific groove geometries. These structural modifications change the impedance characteristics and current distribution patterns, thereby improving isolation performance without requiring increased physical separation between antenna elements.
2Volume of moving object
If the distance between antennas is reduced to achieve miniaturization, then the device size is reduced, but the radiation efficiency deteriorates
Solution Approach 1:
The interconnecting portion with U-shaped grooves serves as a mediator that optimizes electromagnetic field distribution in the compact antenna configuration. By carefully designing the groove geometry and position, the structure enables both antennas to maintain effective radiation patterns while closely spaced, preventing energy loss that would otherwise occur in miniaturized configurations.
3Ease of manufacture
If the antenna structure is simplified to reduce manufacturing complexity, then the manufacturing cost is reduced, but the isolation performance deteriorates
Solution Approach 1:
The interconnecting portion is integrated with the ground structures of both antennas, merging multiple functions into a single component. This ground interconnecting structure simultaneously serves as the ground reference for both antennas and provides the isolation mechanism through its U-shaped groove configuration, simplifying manufacturing while achieving improved isolation performance.
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 antenna assembly achieves high isolation between antennas without compromising radiation efficiency, maintaining return loss and radiation efficiency within the desired frequency bands.
Implementation Method 1
improving isolation by adjusting impedance matching
Implementation Method 2
maintaining return loss and radiation efficiency within the desired frequency bands
Data Source
AI summary
An antenna assembly includes a pair of antennas and an interconnecting portion. Each antenna includes a ground portion, a feed-in portion spaced apart from the ground portion and having a feed-in end that is configured to be fed with a RF signal, a short-circuit portion electrically connected to the ground portion and the feed-in portion, and a radiating portion electrically connected to the feed-in portion and spaced apart from the ground portion. The interconnecting portion is electrically connected between the short-circuit portions and between the ground portions of the pair of antennas, and is formed with a U-shaped main groove that has a pair of opposite ends adjacent to the pair of antennas, respectively.