Asymmetric Patch Antenna Heights for Wider Bands in Thin Terminals
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Solution Overview
Problem
Mobile terminals have become thinner, necessitating effective utilization of internal space and expansion of antenna bands, while existing antenna devices struggle to achieve band expansion due to uniform distances from the ground conductor to planar antennas.
Innovation Solution
An antenna device with a dielectric substrate, a ground plane, and feed lines, where the second antenna element is positioned higher than the first antenna element, forming an array antenna configuration, allowing for band expansion and efficient use of internal space by varying the distance from the ground plane to the casing's inner surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the distances from the ground conductor to the planar antennas are made uniform, then the antenna structure is simple and easy to manufacture, but band expansion becomes difficult to achieve
Solution Approach 1:
The patent applies asymmetry by positioning the second antenna element at a different height from the ground plane compared to the first antenna element. Specifically, the second antenna element is disposed at a position where the distance to the ground plane is greater than the distance from the first antenna element to the ground plane, creating an asymmetric configuration that enables band expansion while maintaining manufacturing feasibility.
Solution Approach 2:
The patent utilizes the vertical dimension (height direction) to achieve band expansion. By varying the heights of the antenna elements relative to the ground plane, the invention transforms a two-dimensional planar antenna configuration into a three-dimensional structure, allowing different frequency bands to be operated simultaneously without compromising manufacturing simplicity.
2Volume of moving object
If mobile terminals are made thinner, then the device size is reduced and portability is improved, but the internal space for antenna configuration becomes limited
Solution Approach 1:
The patent effectively utilizes the vertical dimension within the limited thickness of the terminal. By configuring antenna elements at different heights from the ground plane rather than spreading them out horizontally, the invention maximizes the use of available internal space in the thickness direction, enabling adequate antenna configuration space without increasing terminal volume.
Solution Approach 2:
The patent employs a nested configuration where multiple antenna elements are arranged in the vertical direction above the ground plane. This nesting approach allows multiple antenna functions to be stacked within the limited thickness, effectively utilizing the internal space without requiring additional horizontal area.
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 achieves band expansion and effective utilization of internal space, as demonstrated by simulations showing wider operating frequency bandwidths and extended coverage areas compared to conventional designs.
Implementation Method 1
a first radiating element and a second radiating element connected to the feed line, respectively
Implementation Method 2
the first feed element and the ground plane constitute a patch antenna, and the second feed element and the ground plane constitute a patch antenna
Data Source
AI summary
A ground plane is disposed on or in an inner layer of a dielectric substrate. Moreover, a feed line is disposed on or in the dielectric substrate. A first antenna element and a second antenna element are supported on the dielectric substrate. The first antenna element and the second antenna element include a first radiating element and a second radiating element connected to the feed line, respectively, and are disposed on a same side when seen from the ground plane. With a height of the ground plane being a reference, a top portion of the second antenna element is located higher than a top portion of the first antenna element. There is provided an antenna device of which the band can be expanded and of which the internal space of the casing can be effectively utilized.