Dual-Feed Slit Antenna Layout for Metal-Proximate Housings
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Solution Overview
Problem
Antenna devices installed in limited spaces within communication devices often face challenges due to proximity to metal components, which can distort radiation patterns and limit the arrangement of feeding points or lines, necessitating a solution to minimize these influences.
Innovation Solution
The proposed antenna device incorporates a substantially-flat-plate-shaped dielectric substrate with a metal base plate and flat-plate-shaped antenna elements arranged on opposite sides to form a slit, featuring feeding portions with a 180-degree phase difference to reduce the impact of metal proximity and optimize power feeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna device is installed close to metal components in limited space, then the device can be built in compact housing, but the radiation pattern is distorted due to metal proximity
Solution Approach 1:
A dielectric substrate is introduced as an intermediary layer between the antenna element and the metal base plate. This dielectric layer isolates the antenna element from direct metal proximity effects while maintaining compact device volume, thereby reducing radiation pattern distortion caused by metal interference
Solution Approach 2:
The antenna device employs a composite structure combining dielectric material (substrate) with metal components (base plate and antenna element). This composite configuration allows the antenna to maintain close proximity to metal for compact housing while the dielectric material mitigates the harmful electromagnetic interference from the metal
2Volume of moving object
If the feeding line is arranged in limited space, then the device can be compact, but the radiation pattern is distorted due to feeding line arrangement
Solution Approach 1:
The feeding line is implemented as a thin microstrip line that can be flexibly arranged on the dielectric substrate surface. This thin-film approach allows the feeding line to be routed through limited spaces without creating bulky structures that would distort the radiation pattern
Solution Approach 2:
The feeding line is arranged in a planar configuration on the dielectric substrate, utilizing the two-dimensional surface area rather than extending in three-dimensional space. This dimensional approach allows efficient space utilization while maintaining a low profile that minimizes radiation pattern distortion
Data Source
AI summary
To implement an antenna device capable of further reducing an influence of proximity to a metal and feeding power to an antenna element in a more suitable manner.An antenna device includes: a substantially-flat-plate-shaped dielectric substrate; a metal base plate arranged on a first surface of the dielectric substrate; substantially-flat-plate-shaped first and second antenna elements arranged on a second surface of the dielectric substrate that is opposite to the first surface and on an opposite side of the dielectric substrate from the metal base plate so that a slit is formed; a first feeding pin that feeds power to the first antenna element; and a second feeding pin that feeds power to the second antenna element, in which a phase difference between feeding signals supplied to the first and second feeding pins, respectively, is approximately 180 degrees.