Antenna Module Layout With Peripheral Electrode for Limited Ground Area
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Solution Overview
Problem
The reduction in size and thickness of communication devices, such as portable terminals, leads to limitations in the installation location of antenna modules, potentially resulting in an insufficient area for the ground electrode, which can degrade antenna characteristics.
Innovation Solution
The antenna module incorporates a dielectric substrate with a peripheral electrode placed between the radiating element and the ground electrode, enhancing the capacitance component and reducing electric field lines, thus maintaining desired resonant frequencies and antenna characteristics even with a limited ground electrode area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the communication device is reduced, then the device becomes more compact and portable, but the area available for the ground electrode in the antenna module becomes limited
Solution Approach 1:
The patent introduces a peripheral electrode arranged in a direction orthogonal to the polarization direction of the radiating element, utilizing the lateral dimension to compensate for the limited ground electrode area. This dimensional approach allows the antenna module to achieve desired capacitance and antenna characteristics without increasing the overall device footprint.
Solution Approach 2:
The peripheral electrode acts as an intermediary element between the radiating element and the ground electrode. It provides additional capacitance and modifies the electric field distribution, effectively compensating for the limited ground electrode area caused by device size reduction.
2Volume of moving object
If the ground electrode area is limited, then the device can be made more compact, but antenna characteristics such as frequency bandwidth and loss deteriorate
Solution Approach 1:
The peripheral electrode extends in the direction orthogonal to the polarization direction, utilizing the lateral dimension to provide additional capacitance. This allows the antenna module to maintain desired resonant frequency and frequency bandwidth without increasing the ground electrode area in the polarization direction.
Solution Approach 2:
The patent modifies the capacitance parameter of the antenna system by introducing the peripheral electrode. This changes the electrical characteristics of the antenna module, allowing it to achieve desired resonant frequency and frequency bandwidth even with a limited ground electrode area.
3Length of moving object
If the dimension of the ground electrode in the polarization direction is reduced, then the device can be made more compact, but the resonant frequency and frequency bandwidth are affected
Solution Approach 1:
The peripheral electrode is arranged in the direction orthogonal to the polarization direction, utilizing the lateral dimension to provide additional capacitance. This compensates for the reduced ground electrode dimension in the polarization direction and maintains the desired resonant frequency accuracy.
Solution Approach 2:
The antenna module employs an asymmetric configuration where the peripheral electrode provides additional capacitance in the direction orthogonal to the polarization direction. This asymmetric arrangement compensates for the limited ground electrode dimension and maintains accurate resonant frequency.
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 peripheral electrode effectively increases capacitance and reduces electric field lines, allowing the antenna module to maintain optimal antenna characteristics, including resonant frequency and frequency bandwidth, even when the ground electrode area is limited.
Implementation Method 1
the peripheral electrode increases a capacitance component between the radiating element and the ground electrode, and therefore a desired resonant frequency can be achieved even when the dimension of the radiating element is shortened
Implementation Method 2
The first radiating element is configured to radiate a radio wave in a first polarization direction
Data Source
AI summary
An antenna module includes a dielectric substrate including a plurality of laminated dielectric layers, a radiating element, a ground electrode, and a peripheral electrode. The ground electrode opposes the radiating element. The peripheral electrode is on a layer between the radiating element and the ground electrode and electrically connected to the ground electrode. The radiating element radiates a radio wave in a first polarization direction. A dimension of the ground electrode in the first polarization direction is shorter than a dimension of the ground electrode in a specific direction orthogonal to the first polarization direction. When the dielectric substrate is seen in plan view in a layered direction, at least a portion of the peripheral electrode is disposed between an end portion of the ground electrode and an end portion of the radiating element in the first polarization direction.