Mobile Terminal Antenna with Adjustable Ground Cable for Multi-Band Resonance
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Solution Overview
Problem
Conventional mobile phone antenna designs face challenges in multi-band carrier aggregation due to resonance frequency offsets, leading to poor medium-high frequency performance and inadequate coverage of frequency bands, especially when clearance is reduced.
Innovation Solution
The antenna design includes a radiator with separate parts connected by gaps, a medium-high frequency feeder, a low frequency feeder, and an adjustable ground cable with a control component, allowing the antenna to switch between resonance frequencies and excite additional resonances, thereby increasing bandwidth and improving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a low frequency signal and a medium-high frequency signal are separately fed to avoid resonance frequency offset, then the medium-high frequency performance is improved, but the space for each antenna becomes smaller and the medium-high frequency antenna is compressed within a small region resulting in poor antenna performance
Solution Approach 1:
The patent makes a single radiator structure serve multiple frequency bands by configuring it with multiple feeders (low frequency feeder and medium-high frequency feeder) and multiple connection points. The radiator can be excited at different resonance frequencies corresponding to different frequency bands, eliminating the need for separate antennas for different frequency ranges and solving the space occupation problem while maintaining performance.
Solution Approach 2:
The patent segments the single radiator into multiple functional parts by defining multiple connection points (first connection point for medium-high frequency, second connection point for low frequency, third connection point for ground). This segmentation allows different portions of the radiator to be excited independently at different frequencies, enabling multi-band operation from a unified structure.
2Adaptability or versatility
If the clearance between antenna parts is large to cover full frequency range, then the frequency coverage is improved, but as the clearance decreases the bandwidth of the medium-high frequency antenna severely deteriorates and not all frequencies can be covered
Solution Approach 1:
The patent changes the electrical parameters of the antenna system by introducing an adjustable component that can modify the conduction state of the ground connection. This parameter change allows the antenna to adapt its resonance characteristics and bandwidth to cover different frequency ranges, maintaining performance even when physical clearance is reduced.
Solution Approach 2:
The patent introduces dynamic controllability to the antenna system through the adjustable component on the ground connection. The ground connection can be dynamically switched between conducted and non-conducted states, allowing the antenna to adapt its electrical length and resonance properties in real-time, thereby maintaining bandwidth and frequency coverage under varying clearance conditions.
3Adaptability or versatility
If the existing technical solution is used to cover new frequency bands B21 (1.5 GHz) and B42 (3.5 GHz), then the frequency band coverage is improved, but the existing solution cannot meet the requirement
Solution Approach 1:
The patent enhances the universality of the radiator structure by configuring multiple feeders and connection points that can support excitation at multiple resonance frequencies including the new B21 (1.5 GHz) and B42 (3.5 GHz) bands. The single radiator can be adapted to cover these new frequency ranges by appropriate feeder configuration, meeting the expanded frequency band requirements.
Solution Approach 2:
The patent uses parameter changes through the adjustable component to enable the antenna to cover new frequency bands. By adjusting the conduction state of the ground connection, the electrical characteristics of the radiator can be modified to support resonance at the new B21 and B42 frequency bands, making the existing structure capable of meeting new frequency coverage 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 enhances the antenna's ability to cover a broader frequency band, particularly in the medium-high frequency range, by exciting new resonances and maintaining performance even in reduced clearance, thus improving communication effectiveness.
Implementation Method 1
when the adjustable component is not conducted, the antenna works at least on a first resonance frequency, and does not work on a second resonance frequency; when the adjustable component is conducted, the antenna works at least on the first resonance frequency and on the second resonance frequency
Data Source
AI summary
An antenna includes a radiator, where the radiator includes three parts separated by a gap, an end of a second part proximate to a first part is a first end, and an end of the second part proximate to a third part is a second end, a medium-high frequency feeder, electrically coupled to the radiator at a first coupling point, a low frequency feeder electrically coupled to the radiator, a first ground cable electrically coupled to the radiator at a second coupling point, where an adjustable component for controlling conduction of the first ground cable is disposed on the first ground cable, a length from the second coupling point to an end that is in the first end and the second end and that is further from the first coupling point is a quarter of a wavelength corresponding to a resonance frequency.