Multiband Antenna Ground Terminal Layout for Compact Efficiency
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Solution Overview
Problem
The existing multiband antenna designs, such as those with conductive plates on dielectric substrates, face challenges in reducing size without compromising antenna characteristics.
Innovation Solution
The multiband antenna incorporates first and second ground terminals extending from the conductor main portion, allowing the use of an external conductor as a host, which enables downsizing while maintaining high radiation efficiency by appropriately positioning these terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conductive plate is formed on a dielectric substrate to create an antenna device, then the antenna structure is established, but the size of the antenna cannot be reduced
Solution Approach 1:
The invention extracts the ground plane function from the traditional dielectric substrate configuration and relocates it to an external conductor (device housing). This separation allows the antenna element to be downsized while the external conductor provides the necessary ground reference, resolving the contradiction between size reduction and maintaining antenna characteristics.
Solution Approach 2:
The external conductor serves dual purposes: it acts as both the device housing/enclosure and the ground plane for the antenna. This multi-functionality eliminates the need for a separate ground plane structure, enabling size reduction while maintaining full antenna functionality.
2Volume of moving object
If the antenna size is reduced, then compactness is improved, but radiation efficiency deteriorates
Solution Approach 1:
The antenna design utilizes the device's own external conductor (housing) to provide the ground plane function, rather than requiring a separate dedicated ground structure. This self-service approach maintains radiation efficiency while enabling compact antenna dimensions, as the housing naturally serves as the ground reference.
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 allows for a compact antenna design with high radiation efficiency, effectively addressing the size reduction challenge without deteriorating antenna performance.
Implementation Method 1
a multiband antenna (10) has a conductor main portion (12) in which a slot (130) is formed
Implementation Method 2
the multiband antenna (10) has first and second ground terminals (14, 16) both of which extend from a second long edge (127) of the conductor main portion (12)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A multiband antenna has a conductor main portion, a first ground terminal and a second ground terminal. The conductor main portion is long in a first direction and extends in a horizontal plane defined by the first direction and a second direction. The conductor main portion has a first long edge and a second long edge at both ends thereof in the second direction, respectively. The conductor main portion is formed with a slot and an opening portion. The slot is long in the first direction. The opening portion is provided in the first long edge and connects the slot with an outside of the conductor main portion. The first ground terminal and the second ground terminal extend from the second long edge. The first ground terminal and the second ground terminal are connected to a host conductor when the multiband antenna is used.