Band-Stop Circuit for Ground Plane Isolation in Foldable Antennas
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Solution Overview
Problem
The existing designs for folder-type mobile communication devices face inefficiencies due to the change in system ground plane, requiring complex and costly designs to maintain antenna performance, as bar-type mobile phone antennas are not directly compatible.
Innovation Solution
A folder-type mobile communication device is designed with a band-stop circuit and a metal line connecting two system ground planes, allowing the use of bar-type antenna designs by incorporating a slit, capacitive, and inductive elements forming a parallel LC resonant circuit to reduce the influence of the second ground plane on the antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If bar-type mobile phone antenna is directly used as folder-type mobile phone antenna, then device simplicity is improved, but antenna efficiency deteriorates due to ground plane change
Solution Approach 1:
The patent introduces a ground plane isolation structure as an intermediary between the antenna and the second ground plane. This isolation structure prevents direct interaction between the antenna and the second ground plane, thereby maintaining antenna performance while allowing the use of simpler bar-type antenna designs in folder-type devices.
2Reliability
If two connection devices are used to connect two system ground planes, then ground plane coupling is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the ground plane coupling function into the ground plane structure itself through the ground plane isolation structure, eliminating the need for separate connection devices. This integration maintains effective ground plane coupling while reducing device complexity and manufacturing cost.
3Reliability
If different antenna types are designed for bar-type and folder-type devices, then antenna performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent creates a universal antenna solution where the same bar-type antenna design can be used in both bar-type and folder-type devices. The ground plane isolation structure enables this universality by ensuring consistent antenna performance across different device types, thereby reducing manufacturing costs.
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 solution enables similar antenna characteristics in folder-type devices to those of bar-type devices, improving efficiency and reducing manufacturing complexity and costs by allowing direct use of bar-type antenna designs, while maintaining impedance matching and radiation characteristics across various frequency bands.
Implementation Method 1
a capacitive element, arranged across the slit, wherein two ends of the capacitive element are respectively electrically connected to two sides of the slit; and an inductive element, arranged across the slit, wherein two ends of the inductive element are respectively electrically connected to two sides of the slit, such that the inductive element and the capacitive element form a parallel LC resonant circuit, and the band-stop circuit generates a parallel resonance at a specified frequency
Implementation Method 2
a metal line, wherein the second ground plane is electrically connected to the first ground plane through the metal line
Data Source
AI summary
The present invention is related to a folder-type mobile communication device. The device comprises a first dielectric substrate, a first ground plane disposed on the first dielectric substrate, a second dielectric substrate, a second ground plane disposed on the second dielectric substrate, an antenna element, a metal line, and a band-stop circuit. The antenna element is located near the first ground plane and is electrically connected to a source on the first dielectric substrate. The second ground plane is electrically connected to the first ground plane through the metal line. The band-stop circuit is located either on the first ground plane or on the second ground plane. The band-stop circuit includes a slit, a capacitive element, and an inductive element. The slit is near the metal line. The capacitive element is electrically connected to the two sides of the slit, and the inductive element is electrically connected to the two sides of the slit such that the inductive element and the capacitive element form a parallel LC resonant circuit. Therefore, the band-stop circuit generates a parallel resonance at a specified frequency.