Asymmetric Meander Antenna Module for Compact Wireless Devices
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Solution Overview
Problem
Conventional antennas in cell phones face challenges with reduced size and interference from metal electronic components, leading to compromised signal reception quality due to increased circuit volume and reduced antenna space.
Innovation Solution
An antenna module featuring a signal feeding part, a ground part, and a first asymmetric meander line that does not meander inward, along with additional conductor branches, which reduces the antenna's area and generates an inductive effect to counteract capacitance, improving radiation efficiency and allowing non-overlap with metal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the antenna size is reduced to satisfy aesthetic requirements, then the cell phone size is reduced, but the signal reception quality deteriorates due to interference from metal electronic components
Solution Approach 1:
The patent transitions from a planar two-dimensional antenna layout to a three-dimensional folded structure. The conductor element is folded back on itself multiple times within a compact footprint, utilizing the third dimension (vertical folding) to achieve a longer effective radiating length while maintaining a small planar area. This dimensional transformation allows the antenna to maintain adequate electrical length for signal reception while fitting within reduced physical space constraints.
Solution Approach 2:
The antenna conductor element is folded and nested within itself, creating a compact structure where the conductor path doubles back through the same physical space. The meander line pattern nests multiple segments of the conductor within a confined area, allowing the antenna to achieve a longer effective length without proportionally increasing the physical footprint, thus avoiding interference with metal components while maintaining reception quality.
2Adaptability or versatility
If metal electronic components are disposed under the antenna to increase circuit volume, then functionality is improved, but the antenna's signal reception quality deteriorates due to interference
Solution Approach 1:
By folding the antenna conductor in three dimensions, the patent creates a compact structure that concentrates the antenna's electromagnetic field in a smaller spatial region. This reduces the antenna's effective footprint and minimizes the area where metal components could cause interference, allowing metal components to be placed elsewhere in the device without degrading signal reception quality.
Solution Approach 2:
The patent employs an asymmetric meander line pattern where the conductor folds in specific directions with varying segment lengths and angles. This asymmetric configuration optimizes the current distribution and radiation pattern, creating nulls or reduced field strength in directions where metal components are likely to be positioned, thereby minimizing interference while maintaining overall antenna performance.
3Reliability
If a conventional planar inverted-F antenna is used, then impedance matching can be achieved, but the antenna area is large which causes interference from metal components
Solution Approach 1:
The patent replaces the conventional planar inverted-F antenna structure with a folded meander line configuration that utilizes three-dimensional folding. This dimensional transformation allows the antenna to achieve the necessary electrical length and impedance characteristics within a much smaller planar footprint, eliminating the need for large antenna areas while maintaining impedance matching capability through adjusted feed point positions and conductor geometry.
Solution Approach 2:
The antenna conductor is divided into multiple segmented sections forming a meander line pattern, with each segment contributing to the overall electrical length and impedance characteristics. By segmenting the conductor and arranging it in a folded configuration, the patent achieves impedance matching through the cumulative effect of multiple segments while maintaining a compact overall structure that minimizes interference with metal components.
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
The solution effectively reduces the antenna's volume by over 40% and enhances radiation efficiency to cover four frequency bands (GSM900, DCS, PCS, WCDMA) with greater than 60% efficiency, minimizing interference from metal components.
Implementation Method 1
the first asymmetric meander line does not meander toward its inner side... the first asymmetric meander line can generate an inductive effect
Implementation Method 2
since a capacitance effect can be generated between the metal ground surface element 101 and the radiation conductor element 102, and a capacitor can store energy
Implementation Method 3
A signal is fed in via the signal feeding part to allow the first asymmetric meander line to excite a first resonance frequency
Data Source
AI summary
This invention provides an antenna module and an electronic device using the same. The antenna module includes a signal feeding part, a ground part, and a first asymmetric meander line. One terminal of the first asymmetric meander line is connected with the signal feeding part, the other terminal is connected with the ground part, and the first asymmetric meander line does not meander toward its inner side. A signal is fed in via the signal feeding part to allow the first asymmetric meander line to excite a first resonance frequency. An area of the antenna module in the invention is smaller than that of a conventional planar antenna, and the antenna module can generate an inductive effect to improve antenna radiation efficiency. Besides, since the area of the antenna module is small, a metal electronic component in the electronic device and the antenna module won't overlap thus to reduce interference.