Metal Body Antenna Loop Coupling Wideband Multi-Band Operation
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Solution Overview
Problem
Conventional metal body antennas with loop type radiation elements face challenges in achieving wideband characteristics across multiple bands due to limited space within communication devices, leading to inefficiencies and increased production costs, while existing solutions like tubable antenna technologies introduce additional design complexities and power consumption.
Innovation Solution
A metal body antenna design featuring loop type radiation elements with a frame bezel unit, where the radiation element is connected to the ground by loop coupling, generating induction currents and concentrating electric and magnetic energy, and incorporating L-C elements for impedance matching, allowing for efficient operation across multiple bands without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional metal body antennas with loop type radiation elements are used, then the antenna structure is simple and space is saved, but the bandwidth is narrow and cannot support multiple communication bands efficiently
Solution Approach 1:
The radiation element is divided into multiple segments with different electrical lengths, where each segment is responsible for radiating in specific frequency bands. This segmentation allows the antenna to cover multiple communication bands (GSM850, EGSM, DCS, PCS, W2100) simultaneously while maintaining a compact metal body structure without requiring additional antenna components.
2Adaptability or versatility
If tubable antenna technology is added to support multiple bands, then bandwidth is improved, but production cost increases and design period extends
Solution Approach 1:
The patent merges the functions of multiple antennas into a single metal body antenna structure. The housing unit itself serves as the antenna body, integrating the radiation elements directly into the metal casing. This eliminates the need for separate tubable antenna components, thereby reducing production costs and simplifying the manufacturing process while maintaining wideband performance across multiple communication bands.
3Adaptability or versatility
If multiple antennas are disposed within the terminal, then multiple bands are supported, but the terminal size increases and space is consumed
Solution Approach 1:
The metal body antenna is designed with universal multi-functionality to support all major communication bands (GSM850, EGSM, DCS, PCS, W2100) using a single antenna structure. The radiation element incorporates multiple segments with different electrical lengths, allowing one antenna to perform the function of multiple antennas, thereby saving terminal space and enabling thinner device design while maintaining comprehensive band support.
4Loss of energy
If the radiation element is connected to ground by loop coupling, then radiation loss is reduced and wideband characteristic is achieved, but the coupling structure increases device complexity
Solution Approach 1:
The loop coupling structure is integrated directly into the metal body housing, utilizing the existing conductive path of the housing itself. The radiation element is coupled to ground through the housing's metallic structure, which naturally forms the loop coupling path. This self-service approach reduces radiation loss and achieves wideband characteristics without requiring additional external coupling components, thereby maintaining manufacturing simplicity.
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 design achieves a wideband characteristic in multiple bands with reduced radiation loss and smaller size, enabling efficient use of terminal space and reducing production costs by eliminating the need for additional technologies, while maintaining performance across frequencies like GSM850, EGSM, DCS, PCS, and W2100.
Implementation Method 1
the radiation element supplied with a signal from a feeding power port is connected to a ground by loop coupling
Implementation Method 2
generating induction currents and concentrating electric and magnetic energy
Data Source
AI summary
A metal body antenna having loop type radiation elements in which a housing unit is used as an antenna includes a radiation element supplied with a signal from a feeding power port, a ground coupled to the radiation element by loop coupling and in which an induction current is generated, and a frame bezel unit having an open end part separated from the ground by a dielectric and a gap. The frame bezel unit having the open end part supplied with an electric current induced into the ground is connected, and the metal body antenna operates in a wideband in multiple bands having an electrical length of a half wavelength. Accordingly, the bezel unit of a frame unit is effectively used and all of the Penta bands (i.e., GSM850, EGSM, DCS, PCS, and W2100) used in mobile phones is satisfied through a wideband multi-antenna structure having a small radiation loss.