Multi-band Antenna with Nested High-frequency Arm
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Solution Overview
Problem
The challenge is to design a compact multi-band antenna for portable electronic devices that can accommodate increasing wireless signal bandwidth within limited space, while maintaining efficient signal transmission across various frequency bands.
Innovation Solution
The multi-band antenna features a high-frequency arm formed by a first bending portion with a recess and a second bending portion extending into it, combined with an intermediate-frequency sheet section and a low-frequency arm, optimized for signal transmission across multiple frequency bands, including 2.5 GHz to 2.7 GHz, 1.71 GHz to 2.17 GHz, and 824 MHz to 960 MHz bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna is miniaturized to occupy less space, then the device thickness is reduced, but the antenna bandwidth is limited
Solution Approach 1:
The antenna is divided into multiple functional segments: a feeding portion, a ground portion, an intermediate-frequency sheet section, a low-frequency arm, and a high-frequency arm. Each segment is optimized for specific frequency ranges, allowing the compact structure to support multiple bands including 2.5-2.7 GHz, 1.71-2.17 GHz, and 824-960 MHz through coordinated operation of these segmented elements.
Solution Approach 2:
The high-frequency arm employs a nested configuration where the second bending portion extends into the recess of the first bending portion. This nesting arrangement allows the high-frequency radiation element to be compactly integrated within the overall antenna structure, achieving high-frequency performance (2.5-2.7 GHz) without increasing the external dimensions of the antenna.
2Device complexity
If the antenna structure is simplified for compact design, then manufacturing is easier, but signal transmission efficiency across multiple bands deteriorates
Solution Approach 1:
The antenna achieves multi-functionality by designing a unified structure that simultaneously supports multiple frequency bands. The intermediate-frequency sheet section and low-frequency arm work together with the high-frequency arm to provide universal coverage across 824-960 MHz, 1.71-2.17 GHz, and 2.5-2.7 GHz bands, eliminating the need for separate antennas for each band while maintaining transmission efficiency through optimized current paths.
Data Source
AI summary
A multi-band antenna is disposed on a circuit board having a feeding line. The feeding line has a signal-transmitting end and a ground end. The multi-band antenna includes a feeding portion coupled to the signal-transmitting end, a ground portion coupled to the ground end, an intermediate-frequency sheet section extending from the feeding portion toward a first direction, a low-frequency arm, and a high-frequency arm. The low-frequency arm extends from a side of the intermediate-frequency sheet section toward a second direction opposite to the first direction. The high-frequency arm includes first and second bending portions. The first bending portion extends from the side of the intermediate-frequency sheet section toward the second direction so as to connect to the ground portion. The first bending portion has a recess. The second bending portion extends into the recess for transceiving signals within a first frequency band cooperatively with the first bending portion.