Antenna Device Conductive Member Suppresses Radio Wave Reflection
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Solution Overview
Problem
Existing antenna devices experience degradation of antenna characteristics due to radio wave reflection from the housing, which interferes with the desired radiation patterns.
Innovation Solution
The antenna device incorporates a dielectric substrate with a ground layer and a conductive member that electrically connects the feed line to the first radiating element, allowing the radio frequency signal to be supplied directly to the feed element placed on or within the housing, thereby reducing radio wave reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a parasitic element is placed on a cover at a location away from the patch antenna, then the band broadening is achieved, but the radio wave reflection from the housing interferes with the desired antenna characteristics
Solution Approach 1:
A conductive member is introduced as an intermediary element to electrically connect the feed line to the first radiating element (feed element) on the housing. This intermediary structure allows the feed element to be properly excited while positioned on or within the housing, thereby reducing unwanted reflections and improving antenna characteristics while maintaining the band broadening capability provided by the parasitic element configuration.
Solution Approach 2:
The antenna device is segmented into distinct functional components: a feed element on the housing, a parasitic element on the cover, and a conductive member for signal transmission. This segmentation allows each element to perform its specific function independently - the feed element for primary radiation, the parasitic element for band extension, and the conductive member for signal delivery - resolving the conflict between band broadening and antenna characteristic reliability.
2Adaptability or versatility
If space is formed between the multilayer board and the cover, then the parasitic element can be excited by the radiated radio wave, but part of the radio wave is reflected at the cover causing interference
Solution Approach 1:
The harmful reflection effect is addressed by extracting and isolating the reflection issue from the main antenna radiation path. The conductive member is designed to deliver the signal directly to the feed element on the housing, separating the signal transmission path from the radiation path, thereby minimizing the impact of reflections from the cover on the overall antenna 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
This configuration suppresses the degradation of antenna characteristics by minimizing radio wave reflection from the housing, ensuring improved antenna performance.
Implementation Method 1
The conductive member is configured in such a way that when the dielectric substrate is attached to the housing, the conductive member electrically connects the feed line and the first radiating element and supplies a radio frequency signal to the first radiating element
Implementation Method 2
a radio wave radiated from the patch antenna excites the parasitic element, a part of the radio wave is reflected at the cover. In some cases, the reflected radio wave interferes with the radio wave radiated from the patch antenna
Data Source
AI summary
An antenna device is enclosed in a housing. The antenna device includes a dielectric substrate in which a plurality of layers including a ground layer is stacked on top of one another, a feed element, a parasitic element, a feed line, and a conductive member placed in or on the dielectric substrate. The feed element is placed within or on a surface of the housing, and the parasitic element is placed in the dielectric substrate. The feed line is placed, in the dielectric substrate, in a layer between a layer in which the parasitic element is placed and the ground layer and sends a radio frequency signal. When the dielectric substrate is attached to the housing, the conductive member electrically connects the feed line and the feed element and supplies a radio frequency signal to the feed element.