Dipole Antenna with Anti-Symmetric Vibrators for Multi-Band Mobile Terminals
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Solution Overview
Problem
Monopole antennas have limited versatility due to their close relationship with the motherboard and are not suitable for multi-frequency operations, restricting their application in various communication terminals.
Innovation Solution
A dipole antenna with a simple structure, featuring anti-symmetrically positioned first and second vibrators on a dielectric slab, including resonant rings and antenna arms for GSM900 and DCS1800 bands, connected through a feed terminal, which achieves dual-routing ultra-wideband performance and reduces interference with the motherboard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a monopole antenna is used, then the antenna efficiency is relatively high and volume is relatively small, but the antenna has very close relationship with motherboard and is greatly affected by it, and basically a lot of monopole antennas are in one-to-one correspondence with terminals, thus the versatility is not high
Solution Approach 1:
The dipole antenna is designed to support multiple frequency bands (GSM900, DCS1800, and other bands) with a single antenna structure, enabling one antenna to replace multiple terminal-specific monopole antennas. The antenna achieves this through carefully designed vibrators with specific length ratios and configurations that resonate at multiple frequencies, thereby improving versatility while maintaining structural simplicity
Solution Approach 2:
The dipole antenna is divided into multiple independent vibrators (first vibrator with first resonant ring and first antenna arm, second vibrator with second resonant ring and second antenna arm), where each vibrator is responsible for specific frequency bands. This segmentation allows each component to be optimized for its function while collectively achieving multi-band operation and improved versatility
2Adaptability or versatility
If a dipole antenna with multiple vibrators is used to achieve multi-frequency operation, then the bandwidth is extended and versatility is improved, but the device complexity increases
Solution Approach 1:
Multiple vibrators designed for different frequency bands are merged into a single dipole antenna structure that shares common components (feed terminal, dielectric slab, support structure). The first and second vibrators are integrated on the same dielectric substrate with shared feeding mechanisms, reducing overall structural complexity while achieving multi-frequency operation
Solution Approach 2:
The first and second vibrators are configured with asymmetric length ratios (first antenna arm to first resonant ring length ratio between 0.2-0.5, second antenna arm to second resonant ring length ratio between 0.5-0.8), allowing each vibrator to resonate at different frequency bands. This asymmetric design enables multi-frequency operation while maintaining a relatively simple overall structure
3Productivity
If resonant rings and antenna arms are connected to achieve ultra-wideband performance, then the bandwidth is extended, but the manufacturing complexity increases
Solution Approach 1:
The antenna achieves ultra-wideband performance by optimizing specific geometric parameters: the length ratio between antenna arms and resonant rings is controlled within specific ranges (0.2-0.5 and 0.5-0.8), the width-to-length ratio of resonant rings is optimized, and the spacing between vibrators is carefully determined. These parameter optimizations enable broadband operation while maintaining compatibility with standard PCB manufacturing processes
Solution Approach 2:
Different parts of the antenna structure have optimized local characteristics: resonant rings have specific width and spacing for bandwidth enhancement, antenna arms have optimized lengths for frequency selection, and the feed terminal has specific geometry for impedance matching. These localized optimizations achieve ultra-wideband performance through standard manufacturing techniques
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
The dipole antenna provides extended bandwidth, good gain, omni-directionality, and cost-effective bulk production, enabling multi-frequency point working modes while minimizing interference from the motherboard.
Implementation Method 1
a first resonant ring configured to transmit and receive radio signals in a GSM900 (global system for mobile communication) band
Implementation Method 2
a first antenna arm configured to transmit and receive radio signals in a DCS1800 (digital cellular system) band
Implementation Method 3
the first vibrator and the second vibrator are provided anti-symmetrically on the dielectric slab
Data Source
AI summary
The invention provides a dipole antenna and mobile communication terminal. The dipole antenna comprises a first vibrator, a second vibrator, a feed terminal and a dielectric slab, the first vibrator and the second vibrator being provided anti-symmetrically on the dielectric slab, wherein the first vibrator comprises a first resonant ring configured to transmit and receive radio signals in a GSM900 band and a first antenna arm configured to transmit and receive radio signals in a DCS1800 band, the first antenna arm being connected to the first resonant ring; the second vibrator comprises a second resonant ring configured to transmit and receive radio signals in the GSM900 band and a second antenna arm configured to transmit and receive radio signals in the DCS1800 band, the second antenna arm being connected to the second resonant ring; the first antenna arm is connected to the second antenna arm through the feed terminal.