Multiband Antenna with Asymmetric Closed Radiator for Compact 4G Support
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Solution Overview
Problem
Antenna design faces challenges in meeting the requirements of 4G wireless communication technology for frequency bands while maintaining a lightweight, thin, and compact form factor, due to size limitations in conventional communication electronic devices.
Innovation Solution
A multiband antenna design incorporating a short-circuit element, feed element, connection segments, and low-frequency radiating elements with a closed pattern, which provides resonance paths to support frequency bands from 690 MHz to 2600 MHz, allowing for reduced antenna size and enhanced efficiency across various frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional antenna designs are used to support 4G frequency bands, then the antenna can meet frequency band requirements, but the antenna size becomes too large for compact communication devices
Solution Approach 1:
The antenna is divided into multiple functional segments: a first radiating element for lower frequency bands, a second radiating element for higher frequency bands, and a coupling structure connecting them. Each segment is optimized for specific frequency ranges, allowing the overall antenna to support multiple 4G frequency bands (FDD and TDD) without requiring a single large structure
Solution Approach 2:
The second radiating element is positioned within or adjacent to the first radiating element, with the coupling structure integrating both elements into a compact configuration. This nested arrangement allows the antenna to maintain a small overall volume while providing separate resonance paths for different frequency bands, resolving the contradiction between multi-band support and size reduction
2Volume of moving object
If the antenna size is reduced to fit compact devices, then the device becomes more portable, but the antenna can no longer support required frequency bands
Solution Approach 1:
Different portions of the antenna structure are designed with distinct electrical characteristics: the first radiating element has dimensions and impedance suited for lower frequency bands, while the second radiating element is optimized for higher frequency bands. The coupling structure provides localized impedance transformation and isolation, enabling each segment to effectively support its designated frequency range within a compact overall form
Solution Approach 2:
The antenna utilizes three-dimensional spatial arrangement with the coupling structure connecting radiating elements at different heights and orientations. This dimensional approach allows compact packaging while maintaining adequate electrical length for lower frequency operation and proper spacing for higher frequency performance, supporting multiple bands without increasing overall device volume
3Weight of moving object
If the antenna is made lightweight and thin, then it suits modern communication devices, but it loses the ability to maintain performance across multiple frequency bands
Solution Approach 1:
The antenna employs variable impedance transformation through the coupling structure, which includes impedance matching elements that adapt the electrical characteristics between different radiating elements and the feed point. This parameter transformation enables thin, lightweight construction while maintaining proper impedance for multiple frequency bands, preserving multi-frequency performance despite reduced physical dimensions and mass
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 multiband antenna achieves higher efficiency compared to conventional 4G antennas, supporting multiple frequency bands with a compact size, enabling effective integration into communication devices while maintaining performance across low and high-frequency ranges.
Implementation Method 1
The first, the second, the third and the fourth connection segments provide a resonance path whereby the multiband antenna supports low frequency bands
Implementation Method 2
a resonance path provided by high-frequency radiating elements enables the multiband antenna to support high frequency bands
Data Source
AI summary
A multiband antenna is provided. A resonance path is provided by a first connection segment and a low-frequency radiating element with a closed pattern to enable the multiband antenna to support a low frequency band, wherein a first side of the closed pattern is wider than a second side of the closed pattern. The second side of the closed pattern is connected to one end of the first connection segment. The other end of the first connection segment is connected to a feed element.