High-Frequency Radiator Filter Layout for Common-Mode Resonance
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Solution Overview
Problem
Conventional multi-frequency antennas face significant challenges in suppressing common-mode resonance in high-frequency radiators, leading to deterioration of low-frequency indicators and increased processing costs, while also limiting bandwidth.
Innovation Solution
A dual-polarized high-frequency radiator design is implemented, featuring a filter with a capacitor and inductor branch between the balun and ground plane, which weakens the impact of the high-frequency radiator on the low-frequency radiator, ensuring normal signal transmission and maintaining bandwidth without increasing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the width size of the antenna is decreased, then the antenna size is reduced, but common-mode resonance is generated in the high-frequency radiator resulting in deterioration of low-frequency indicators
Solution Approach 1:
A filter circuit is introduced as an intermediary component between the high-frequency radiator and ground plane. This filter acts as a mediator that blocks common-mode resonance signals while allowing normal operation, thus resolving the contradiction between reduced antenna size and maintained low-frequency performance
Solution Approach 2:
The patent modifies the electrical parameters of the high-frequency radiator by adding a filter circuit that changes the impedance characteristics and resonance behavior. This parameter change suppresses common-mode resonance while maintaining the radiator's structural dimensions, enabling smaller antenna size without degrading low-frequency indicators
2Reliability
If a capacitor-inductor-capacitor circuit is loaded on the balun and dipole arm to suppress common-mode resonance, then common-mode resonance is suppressed, but processing costs increase
Solution Approach 1:
The patent extracts the resonance suppression function from the complex capacitor-inductor-capacitor circuit and implements it using a simpler filter circuit with fewer components. This extraction maintains the essential functionality of common-mode resonance suppression while reducing manufacturing complexity and processing costs
3Reliability
If a capacitor-inductor-capacitor circuit is loaded on the balun and dipole arm to suppress common-mode resonance, then common-mode resonance is suppressed, but bandwidth is limited
Solution Approach 1:
The filter circuit serves as an intermediary that selectively suppresses common-mode resonance frequencies while maintaining broadband characteristics. The filter's design allows it to target specific resonant frequencies without restricting the overall operating bandwidth, thus resolving the contradiction between resonance suppression and bandwidth maintenance
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 design effectively resolves common-mode resonance issues in high-frequency radiators while maintaining antenna bandwidth and reducing processing costs, ensuring efficient signal transmission across the frequency bands.
Implementation Method 1
common-mode resonance is generated in a high-frequency radiator when an electromagnetic wave is coupled from a low-frequency radiator to the high-frequency radiator
Implementation Method 2
common-mode resonance is generated in a high-frequency radiator
Implementation Method 3
The filter includes a capacitor branch and an inductor branch
Implementation Method 4
The filter includes a capacitor branch and an inductor branch
Data Source
AI summary
Embodiment high-frequency radiator includes two plus and minus 45-degree single-polarized radiators. The single-polarized radiator includes a radiation arm, a balun, a feeder circuit, a filter, and a ground plane. The radiation arm and the balun are electrically connected. The feeder circuit and the balun are separately disposed on two surfaces of a first dielectric plate that is placed vertically. The ground plane is disposed on a downward surface of a second dielectric plate that is placed horizontally. The first dielectric plate is vertically disposed on the second dielectric plate, and the filter includes a capacitor branch and an inductor branch. The inductor branch is disposed on a same surface of the first dielectric plate as the balun, the inductor branch is separately electrically connected to the balun and the ground plane, and the capacitor branch is coupled to the ground plane.