Switchable Multi-Band Antenna Layout for Compact Wideband Coverage
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Solution Overview
Problem
Existing antenna devices struggle to achieve downsizing and wide band operation without increasing size, particularly when switching between multiple frequency bands.
Innovation Solution
The antenna device incorporates a feeding element, high-band and low-band elements, an auxiliary element capacitively coupled to the low-band element, and a switch to control the conductive state between the auxiliary element and a ground member, allowing for a monopole or loop antenna configuration to cover multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple frequency bands are supported using conventional antenna switching methods, then multi-band operation is achieved, but antenna size increases
Solution Approach 1:
The patent combines high-band and low-band antenna elements into a single integrated structure sharing common feeding elements and ground structures. The high-band element and low-band element are merged in space with overlapping regions, allowing both frequency bands to be supported without proportionally increasing antenna volume.
Solution Approach 2:
The patent implements a nested configuration where the high-band antenna element is positioned within or adjacent to the low-band antenna element structure. The feeding elements and ground structures are nested共享, with the high-band components integrated into the overall low-band structure, achieving compact multi-band operation.
2Volume of moving object
If antenna elements are reduced in size for downsizing, then compact design is achieved, but frequency band coverage is limited
Solution Approach 1:
The patent designs feeding elements and ground structures that serve multiple functions across different frequency bands. The same feeding elements and ground structures support both high-band and low-band operations, allowing compact antenna elements to achieve wide frequency band coverage through multi-functional design.
Solution Approach 2:
The patent employs switching mechanisms that dynamically reconfigure the antenna structure between high-band and low-band modes. The switch connects or disconnects specific elements and ground structures based on the operating frequency band, enabling compact antenna elements to adaptively cover multiple frequency bands.
3Volume of moving object
If high-band and low-band elements are integrated closely, then downsizing is achieved, but interference between frequency bands increases
Solution Approach 1:
The patent extracts and separates the high-band and low-band operational paths using switching mechanisms. The switch selectively connects or disconnects the auxiliary ground structure and specific feeding elements, isolating the high-band and low-band signal paths to prevent mutual interference while maintaining compact integration.
Solution Approach 2:
The patent introduces switching mechanisms as intermediary components between the high-band and low-band elements. The switch acts as a mediator that controls the connection state of auxiliary ground structures and feeding elements, managing the interaction between frequency bands to minimize interference while enabling compact design.
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 configuration enables a compact design that supports multiple frequency bands with reduced interference between bands, achieving efficient operation across a wide frequency range.
Implementation Method 1
an auxiliary element capacitively coupled to the low-band element at an open end of the low-band element
Implementation Method 2
a high-band element connected to the feeding element, the high-band element resonating with the signal in the first frequency band
Implementation Method 3
a low-band element connected to the feeding element, the low-band element resonating with the signal in the second frequency band
Data Source
AI summary
An antenna device includes: a feeding element having a feedpoint that a signal in a first frequency band and a signal in a second frequency band lower than the first frequency band are supplied to; a high-band element connected to the feeding element, the high-band element resonating with the signal in the first frequency band; a low-band element connected to the feeding element, the low-band element resonating with the signal in the second frequency band; an auxiliary element capacitively coupled to the low-band element at an open end of the low-band element; a ground member grounded; and a switch switching a conductive state and a non-conductive state between the ground member and the auxiliary element.