Adjustable Slot Antenna for Multi-Band Mobile Terminal Coverage
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Solution Overview
Problem
Slot antennas in mobile terminals face challenges in covering multiple frequency bands, such as 2G, 3G, and 4G networks, due to their limited resonance frequency range.
Innovation Solution
The implementation of a slot antenna with adjustable units, including reactance elements and a matching circuit, allows for the adjustment of resonance frequencies to cover required bands by connecting different reactance elements and using a switch apparatus to select the appropriate reactance for generating specific frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a slot antenna is designed to occupy small space, then the antenna size is reduced, but the resonance frequency coverage is limited
Solution Approach 1:
The patent applies dynamics by making the antenna structure adjustable through switching between different operational modes. The slot antenna can dynamically change its electrical characteristics by switching between different feed points and adjusting the effective electrical length, allowing it to cover multiple frequency bands while maintaining a compact physical size.
Solution Approach 2:
The patent changes electrical parameters of the antenna by switching between different feed points (first and second feed points) and adjusting the effective electrical length of the slot. This allows the same physical structure to resonate at different frequencies, enabling multi-band coverage without increasing antenna volume.
2Adaptability or versatility
If adjustable units and switching mechanisms are added to enable multiple resonance frequencies, then frequency coverage is improved, but device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by designing a single slot antenna structure that can operate in multiple modes. The same physical slot serves as the radiating element across different frequency bands, and the switching mechanism selectively activates different feed points rather than requiring separate antenna elements for each band.
Solution Approach 2:
The patent merges multiple functional capabilities into a single antenna structure. Different feed points and switching mechanisms are integrated into one compact slot antenna design, combining the functions of multiple antennas into a unified structure that reduces overall system 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
This solution enables the slot antenna to generate multiple resonance frequencies, effectively covering the required bands, including LTE frequencies, while maintaining sufficient bandwidth and radiation efficiency.
Implementation Method 1
a first end of the first adjustable unit is connected to the system circuit board, and the other end of the first adjustable unit is connected to the radiator 3. The first adjustable unit 4 is configured to adjust a resonance frequency of the slot antenna.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention relates to the field of antenna technologies, and provides a slot antenna and a mobile terminal, to generate different resonance frequencies, so as to cover required bands. The slot antenna includes a system circuit board, a grounding conductor, a radiator, and a first adjustable unit. The system circuit board is connected to the grounding conductor to form an electric conductor, and the radiator is opposite to the electric conductor to form a slot. A feeding end is disposed on the system circuit board, the feeding end is electrically connected to the radiator, one end of the first adjustable unit is connected to the system circuit board, the other end of the first adjustable unit is connected to the radiator, and the first adjustable unit is configured to adjust a resonance frequency of the slot antenna.