Multi-band Antenna with Nested Radiative Metallic Portion
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Solution Overview
Problem
Conventional antennas for mobile phones, whether planar or monopole, face challenges in achieving multi-band functionality within the limited design space, leading to increased thickness and inability to meet the requirements of modern multi-band mobile phones.
Innovation Solution
A multi-band antenna design featuring a loop antenna structure with a supporting base and radiative metallic components, including a first radiative metallic wire, sheet, and parasitic arm, which operates in half-wavelength and full-wavelength resonance modes to cover GSM850/900, DCS, PCS, and UMTS bands, with a broad band coverage of 140 MHz and 460 MHz respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional planar or monopole antennas are used to achieve multi-band functionality, then the antenna can cover multiple frequency bands, but the thickness of the mobile phone increases to 7-10 mm
Solution Approach 1:
The patent embeds the radiative metallic portion within a supporting base structure, nesting the antenna elements inside the phone's internal space rather than requiring external protrusion. The radiative metallic portion is positioned within the supporting base, utilizing internal volume to achieve multi-band functionality while maintaining a thin overall profile.
Solution Approach 2:
The patent transitions from traditional planar or monopole antenna configurations to a three-dimensional structure where the radiative metallic portion is arranged in specific spatial configurations within the supporting base. This dimensional change allows for enhanced band coverage through multiple resonance modes without increasing the phone's thickness.
2Length of stationary object
If exposed monopole antennas are used to reduce thickness, then the antenna thickness can be reduced, but the antenna can only meet dual-band requirement and cannot achieve multi-band functionality
Solution Approach 1:
The radiative metallic portion is designed to perform multiple functions simultaneously: it provides both half-wavelength and full-wavelength resonance modes, enabling the antenna to cover multiple frequency bands (GSM850/900, DCS, PCS, UMTS) while maintaining a compact structure suitable for thin mobile phones.
Solution Approach 2:
The patent utilizes changes in resonance parameters by configuring the radiative metallic portion to support both half-wavelength and full-wavelength resonance modes. By adjusting the geometric parameters and electrical connections of the radiative metallic portion, the antenna achieves broad band coverage across multiple frequency bands without increasing thickness.
3Device complexity
If conventional inverted F-type antennas are used within limited design space, then the antenna structure is simple, but it is hard to design an antenna meeting the requirement of multi-band operation
Solution Approach 1:
The patent combines multiple antenna functions into a single radiative metallic portion structure. By integrating both half-wavelength and full-wavelength resonance capabilities within one element, and connecting it to the grounding surface at multiple points, the design achieves multi-band operation while maintaining structural simplicity and ease of manufacturing.
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 antenna design effectively covers the required frequency bands with high return losses (>6 dB) while maintaining a thin profile, meeting the practical requirements of modern mobile phones and offering structural simplicity and ease of integration with internal circuits.
Implementation Method 1
the resonance mechanism of the antenna belongs to that of a loop antenna; by adding a metal wire electrically connected at a suitable position, it can do the operation of 5-bands
Data Source
AI summary
A multi-band antenna, it comprises: a grounding surface, a supporting base and a radiative metallic portion; the grounding surface has a first shorting point and a second shorting point; the radiative metallic portion is attached to a bottom surface of the supporting base, and includes: a first radiative metallic wire, a radiative metallic sheet, a second radiative metallic wire and a parasitic radiative metallic arm. One end point of the first radiative metallic wire is a feeding end for the antenna, while the other end point is electrically connected to the first shorting point of the grounding surface; the radiative metallic sheet is electrically connected to a section of the first radiative metallic wire; the second radiative metallic wire is surrounded by the first radiative metallic wire, of which one end point is electrically connected to the first radiative metallic wire; one end point of the parasitic radiative metallic arm is electrically connected to the second shorting point of the grounding surface.