Compact Wideband Antenna With Intermediary Metal Loop
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Solution Overview
Problem
Conventional high directional antenna structures are limited by the long distance between the radiation element and the reflection plane, making them unsuitable for small mobile devices due to size constraints.
Innovation Solution
A communication device design incorporating a wideband antenna, a reflector, and a first metal loop positioned between the wideband antenna and the reflector, reducing the distance between them to less than 0.25 wavelength of the central frequency, allowing for a compact antenna structure suitable for small devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional high directional antenna structure is used, then radiation performance is improved, but the distance between radiation element and reflection plane becomes too long for small devices
Solution Approach 1:
A first metal loop is introduced as an intermediary component between the wideband antenna (radiation element) and the reflector. This metal loop acts as a mediator that enables effective radiation performance while allowing the distance between the antenna and reflector to be reduced to less than 0.25 wavelength, solving the contradiction between maintaining radiation performance and reducing antenna height for small mobile devices.
2Volume of moving object
If the distance between antenna and reflector is reduced for compact design, then device size is reduced, but radiation performance may deteriorate
Solution Approach 1:
The first metal loop serves as a mediator that enables the antenna structure to achieve compact size (distance less than 0.25 wavelength) while maintaining effective radiation performance. The metal loop compensates for the reduced distance by providing additional electromagnetic coupling and field distribution control.
Solution Approach 2:
The invention changes the electromagnetic parameters of the system by introducing the metal loop with specific dimensions and positioning. This alters the field distribution, impedance characteristics, and resonance behavior, enabling compact antenna design without sacrificing radiation performance across the operating frequency band.
3Ease of operation
If a compact antenna structure is designed for small mobile devices, then ease of operation is improved, but antenna complexity increases
Solution Approach 1:
The first metal loop is designed as a simple planar structure that can be easily manufactured and integrated into small mobile devices. Despite its simplicity, it effectively mediates between the antenna and reflector, providing the necessary electromagnetic functionality without requiring complex multi-element arrays or sophisticated feeding networks.
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 design reduces the height and size of the antenna while maintaining effective radiation performance, supporting multiband operations like LTE, and is suitable for small-size base stations or mobile devices without increasing the overall device size or manufacturing costs.
Implementation Method 1
The reflector is configured to reflect the radiation energy from the wideband antenna
Implementation Method 2
The first metal loop is disposed between the wideband antenna and the reflector. The distance between the wideband antenna and the reflector is shorter than 0.25 wavelength
Data Source
AI summary
A communication device includes a wideband antenna, a reflector, and at least one metal loop. The wideband antenna is configured to cover an operation frequency band. The reflector is configured to reflect the radiation energy from the wideband antenna. The metal loop is positioned between the wideband antenna and the reflector. The distance between the wideband antenna and the reflector is shorter than 0.25 wavelength of a central frequency of the operation frequency band.