Antenna Circuit Bandwidth Expansion via Tuning Circuits
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Solution Overview
Problem
Mobile terminal antennas with integrated full-metal structures face challenges in supporting multi-carrier aggregation due to insufficient bandwidth in intermediate and high frequencies, affecting antenna performance.
Innovation Solution
The antenna circuit design includes rearranging the switching circuit connection point and feed point on the antenna unit, with a first tuning circuit configured to increase bandwidth and resonate frequency in intermediate-high frequencies, and additional tuning circuits to cover various frequency bands, ensuring the distance from the feed point to the antenna unit's end is greater than from the switching circuit connection point to the end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the antenna unit uses an integrated full-metal structure, then the aesthetic appearance and structural integration are improved, but the bandwidth in intermediate and high frequencies becomes insufficient
Solution Approach 1:
The patent implements dynamic switching between different resonant modes by using a switching circuit that can toggle between low-frequency resonant mode and intermediate-high frequency resonant mode. This allows the antenna to adapt its electrical characteristics dynamically, resolving the contradiction between maintaining a fixed full-metal structure and achieving variable bandwidth characteristics across different frequency ranges.
Solution Approach 2:
The patent changes the resonant frequency parameters of the antenna by introducing tuning circuits with adjustable inductors and capacitors. By modifying the electrical parameters (inductance and capacitance values) in the tuning circuits, the antenna can adjust its resonant frequencies to cover different bandwidth requirements in intermediate and high frequency ranges while maintaining the full-metal structure.
2Speed
If the antenna unit supports multi-carrier aggregation, then the network access speed is improved, but the antenna design complexity increases
Solution Approach 1:
The patent designs the antenna unit to perform multiple functions by enabling it to support both low-frequency and intermediate-high frequency bands within a single antenna structure. The switching circuit and tuning circuits allow the same antenna unit to serve multiple frequency aggregation purposes (e.g., B5+B1+B3, B39+B41), reducing the need for separate antenna elements and simplifying the overall system design while achieving multi-carrier aggregation capability.
Solution Approach 2:
The patent combines multiple resonant modes (low-frequency resonant mode and intermediate-high frequency resonant mode) into a single antenna unit. By merging these different resonant characteristics into one integrated structure with shared switching and tuning circuits, the patent achieves multi-band support without proportionally increasing design complexity, as the circuits are integrated rather than duplicated.
3Reliability
If the switching circuit connection point is positioned closer to the end of the antenna unit, then the low-frequency performance is improved, but the intermediate-high frequency bandwidth becomes insufficient
Solution Approach 1:
The patent uses dynamic switching between different resonant modes to resolve the positional contradiction. When operating in low-frequency mode, the switching circuit connects to the first resonant mode with the switching circuit connection point optimized for low-frequency performance. When operating in intermediate-high frequency mode, it switches to the second resonant mode where the feed point configuration optimizes bandwidth. This dynamic reconfiguration allows the same physical positions to serve different frequency ranges optimally.
Solution Approach 2:
The patent segments the antenna's resonant characteristics into distinct modes (low-frequency resonant mode and intermediate-high frequency resonant mode) that can be independently activated. By segmenting the resonant behavior, the patent can optimize different portions of the antenna for different frequency ranges while using switching circuits to select the appropriate mode, effectively resolving the contradiction between low-frequency performance and intermediate-high frequency bandwidth requirements.
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 improves the bandwidth and performance of the antenna in intermediate and high frequencies, enabling better support for multi-carrier aggregation and enhancing communication performance in mobile terminals.
Implementation Method 1
a first tuning circuit is connected with the switching circuit connection point, the first tuning circuit is configured to increase a bandwidth of a single resonant mode in an intermediate-high frequency and/or to tune a resonant frequency in the intermediate-high frequency
Data Source
AI summary
The present disclosure provides an antenna circuit and a mobile terminal. The antenna circuit includes: an antenna unit; a switching circuit connection point and a feed point are arranged on the antenna unit; an antenna feed is connected with the feed point; a first tuning circuit is connected with the switching circuit connection point, the first tuning circuit is configured to increase a bandwidth of a single resonant mode in an intermediate-high frequency and/or to tune a resonant frequency in the intermediate-high frequency; wherein a distance from the feed point to the end of the antenna unit is larger than a distance from the switching circuit connection point to the end of the antenna unit.