Antenna System Adjustable Matching Circuit Wide Bandwidth
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Solution Overview
Problem
Current mobile terminal antennas face challenges in covering a wide frequency band due to limited space, which is exacerbated by the need to support multiple communication standards including LTE, as the existing space constraints cannot accommodate the required bandwidth for frequency bands such as 698-960 MHz and 1710-2170 MHz.
Innovation Solution
An antenna system with a simple metallic strip radiator and an adjustable matching circuit connected between the radiator and the radio frequency interface, allowing resistance adjustment to support multiple frequency bands, thereby enabling wide frequency band coverage without the need for resonant length in the antenna radiator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the antenna space is reduced to accommodate complex mobile terminal structures, then the mobile terminal structure complexity is improved, but the antenna bandwidth becomes narrow
Solution Approach 1:
The patent applies parameter changes by using an adjustable matching circuit that can dynamically change the electrical parameters (impedance, resonant frequency) of the antenna system. This allows a compact physical antenna structure to achieve wide bandwidth performance through parameter adjustment rather than physical size expansion.
Solution Approach 2:
The patent implements dynamics by introducing a switchable matching circuit that can dynamically adjust the antenna's electrical characteristics based on different operating conditions. This dynamic adjustment enables the antenna to adapt to multiple frequency bands and maintain optimal performance across varying bandwidth requirements.
2Device complexity
If the antenna space is reduced to accommodate complex mobile terminal structures, then the mobile terminal structure complexity is improved, but the frequency band coverage becomes insufficient
Solution Approach 1:
The patent applies universality by designing a single antenna structure that can serve multiple frequency bands through the adjustable matching circuit. The matching circuit enables one physical antenna to perform multiple functions across different frequency ranges (GSM, WCDMA, LTE bands), eliminating the need for separate antennas for each band.
Solution Approach 2:
The patent uses parameter changes to enable broad frequency band coverage. By adjusting the matching circuit parameters, the antenna's resonant frequency and impedance characteristics can be tuned to operate across multiple frequency bands including 698-960 MHz, 1710-2170 MHz, and other LTE bands, achieving versatile coverage from a compact structure.
3Volume of moving object
If a simple antenna structure is used to save space, then the space utilization is improved, but the bandwidth coverage becomes narrow
Solution Approach 1:
The patent introduces an intermediary component - the adjustable matching circuit - that mediates between the simple compact antenna structure and the requirement for wide bandwidth. This intermediary transforms the limited electrical characteristics of the small antenna into broad bandwidth performance through impedance transformation and resonant frequency adjustment.
Solution Approach 2:
The patent applies parameter changes through the matching circuit to decouple the physical antenna size from the electrical bandwidth performance. By changing the electrical parameters via the matching circuit, a small physical antenna can achieve the electrical characteristics of a much larger antenna, maintaining compact volume while expanding bandwidth.
Data Source
AI summary
An antenna system and a mobile terminal are disclosed. The antenna system includes an antenna radiator and an adjustable matching circuit connected between the antenna radiator and a radio frequency interface. The adjustable matching circuit adjusts the resistance between the antenna radiator and the radio frequency interface according to a plurality of frequency bands. The antenna radiator in the embodiments of the present disclosure is a metallic body of strip shape, which has a simple structure and is easy to implement and can be combined with the adjustable matching circuit to implement coverage of a larger range band width.