Multi-Radiator Antenna with Slit and Switch for Wideband Coverage
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Solution Overview
Problem
Conventional antenna structures face difficulties in covering the entire 617 MHz to 960 MHz frequency band effectively, particularly in 5G communication systems.
Innovation Solution
The antenna structure incorporates a first main radiator capable of resonating in multiple frequency bands, with a slit for impedance matching adjustment, and a frequency adjustment radiator, along with a switch that connects to lumped elements to select specific grounding paths, enabling broader bandwidth coverage across sub-intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional antenna structure is used, then the structure is simple, but it cannot cover the entire frequency band from 617 MHz to 960 MHz
Solution Approach 1:
The antenna structure integrates multiple radiating elements (first main radiator, second main radiator, third main radiator, and frequency adjustment radiator) that can be selectively activated through switching circuits. This allows a single antenna structure to cover multiple frequency bands (617-960 MHz, 1710-2700 MHz, 3300-5000 MHz, and 5150-5850 MHz) by enabling different elements for different bands, achieving multi-functionality without requiring separate antennas for each band.
Solution Approach 2:
The antenna structure employs switching circuits that can dynamically reconfigure which radiating elements are active based on the desired frequency band. The switch can connect different radiating elements to the feed-in end and ground, allowing the antenna to adapt its electrical characteristics in real-time to cover different frequency ranges, thus resolving the contradiction between coverage and complexity.
2Adaptability or versatility
If the first main radiator is used to cover multiple frequency bands, then frequency band coverage is improved, but impedance matching becomes difficult to optimize for all bands
Solution Approach 1:
The antenna structure divides the frequency coverage task among multiple segmented radiating elements. The first main radiator handles 617-960 MHz and 1710-2700 MHz, the second main radiator handles 3300-5000 MHz and 5150-5850 MHz, and the frequency adjustment radiator provides additional tuning capability. This segmentation allows each element to be optimized for specific frequency ranges, making impedance matching feasible for each band independently rather than trying to optimize a single element for all bands.
Solution Approach 2:
The frequency adjustment radiator connected to the third section of the first main radiator can be configured to change the resonant frequency point of the first frequency band. By adjusting the parameters of this radiator (such as its length, position, or electrical characteristics), the impedance matching can be optimized for different frequency bands, allowing the antenna to maintain good performance across multiple bands despite the complexity of covering such a wide range.
3Adaptability or versatility
If multiple radiating elements are added to cover more frequency bands, then frequency coverage is improved, but the antenna structure becomes more complex
Solution Approach 1:
The antenna structure merges multiple radiating elements (first main radiator, second main radiator, third main radiator, and frequency adjustment radiator) into a single integrated antenna system. All elements share common feed-in end and ground connections through switching circuits, allowing them to be controlled as one unified structure. This merging approach achieves wide frequency coverage while avoiding the complexity of managing completely separate antenna systems for each frequency band.
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 ensures compatibility with multiple frequency bands, providing enhanced bandwidth coverage for the low frequency band while maintaining favorable performance in high frequency bands, as demonstrated by voltage standing wave ratio and antenna efficiency diagrams.
Implementation Method 1
The first main radiator is adapted to resonate in a first frequency band and a second frequency band
Implementation Method 2
A first slit is provided between the second section and the third section and is adapted to adjust impedance matching of the second frequency band
Implementation Method 3
The second main radiator extends from the feed-in end, and is adapted to resonate in a third frequency band and a fourth frequency band
Implementation Method 4
The frequency adjustment radiator is connected to the third section of the first main radiator and is adapted to adjust a resonant frequency point of the first frequency band
Implementation Method 5
One end of the switch is connected to the grounding end of the antenna structure, and another end of the switch is optionally connected to one of the lumped elements or not connected to the lumped elements, so that the antenna structure is connected to one of the grounding paths to resonate in one of the sub-intervals of the first frequency band
Data Source
AI summary
An antenna structure includes a first main radiator, a second main radiator and a frequency adjustment radiator. The first main radiator is adapted to resonate in a first frequency band and a second frequency band, and includes a first section, a second section, a third section and a fourth section sequentially connected. The first section has a feed-in end, and the fourth section has a grounding end. The second section and the third section is connected in bent manner, a first slit is provided between the second section and the third section for adjusting impedance matching of the second frequency band. The second main radiator extending from the feed-in end is adapted to resonate in third frequency band and a fourth frequency band. The frequency adjustment radiator is connected to the third section and is adapted to adjust a resonant frequency point of the first frequency band.