Grooved Antenna Module for Housing-Induced Frequency Shift
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Solution Overview
Problem
Conventional antenna modules experience a loss of radio-frequency signal strength due to parasitic capacitance from the housing, which varies the resonant frequency of the driven element.
Innovation Solution
Incorporating a dielectric member with grooves separate from the radiation electrode, which adjusts the effective dielectric constant and resonant frequency, reducing signal loss by optimizing the antenna's design to compensate for housing-induced frequency deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna module is covered with a housing, then the antenna module is protected and integrated into the communication device, but the parasitic capacitance of the housing causes the resonant frequency to vary and reduces signal strength
Solution Approach 1:
The groove is designed in advance to counteract the harmful effect of parasitic capacitance. By creating a region with reduced dielectric constant before the housing is attached, the resonant frequency shift caused by the housing's parasitic capacitance is compensated, maintaining signal strength and frequency stability.
Solution Approach 2:
The groove changes the effective dielectric constant in the region between the radiation electrode and ground electrode. This parameter change allows adjustment of the resonant frequency to compensate for the frequency shift induced by the housing's parasitic capacitance, thereby resolving the contradiction between housing protection and signal quality.
2Reliability
If the resonant frequency is adjusted to compensate for housing effects, then signal strength is maintained, but the antenna structure becomes more complex
Solution Approach 1:
The groove acts as an intermediary structure between the radiation electrode and the ground electrode. It modifies the effective dielectric constant in the electromagnetic field distribution region, enabling resonant frequency adjustment without directly modifying the radiation electrode or ground electrode structures, thus maintaining relative simplicity.
Solution Approach 2:
Instead of adjusting the resonant frequency by changing the length or shape of the radiation electrode (one-dimensional adjustment), the groove introduces a three-dimensional modification to the dielectric environment. This volumetric approach to frequency control achieves compensation with minimal structural complexity.
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 signal loss and allows for precise adjustment of the resonant frequency, enhancing the antenna's performance by maintaining signal strength and frequency stability even when covered with a housing.
Implementation Method 1
the parasitic capacitance of the housing can cause the resonant frequency of the driven element to vary
Implementation Method 2
the dielectric member has at least one groove separate from the at least one radiation electrode and extending toward a ground electrode
Data Source
AI summary
The present disclosure reduces a loss of strength of a radio-frequency signal radiated from an antenna module covered with a housing. An antenna module (100) includes a dielectric substrate (130), a driven element (141), and a ground conductor (190). The dielectric substrate (130) has a multilayer structure. The driven element (141) is disposed in or on the dielectric substrate (130). The ground conductor (190) is disposed between the driven element (140) and a mounting surface (132) on which a power supply circuit is mountable. The power supply circuit supplies the driven element (140) with radio-frequency power. The dielectric substrate has at least one groove (150). The at least one groove (150) is separate from the driven element (140) when the antenna module (100) is viewed in plan. The at least one groove (150) extends toward the ground conductor (190) from a layer on which the driven element (140) is disposed.