Multi-band LTE Antenna Design for High Gain and Efficiency
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Solution Overview
Problem
Current multi-band LTE antennas face challenges in achieving high gain, high radiation efficiency, and compact size, especially when covering the LTE700/800/900 bands with good return loss, making it difficult to meet the demands of wireless communication devices.
Innovation Solution
A surface-mounted multi-band LTE antenna design that covers the 698-960 MHz and 2400-2500 MHz frequency bands, featuring a unique structure with a main section and four branch sections, which allows for high gain and high radiation efficiency without the need for a matching circuit, and is suitable for wireless communication devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-band LTE antenna is designed to cover LTE700/800/900 bands, then the frequency coverage is improved, but achieving good return loss and sufficient bandwidth becomes difficult
Solution Approach 1:
The antenna is divided into multiple distinct elements including a first antenna element for LTE700/800/900 bands, a second antenna element for LTE1700/2100 bands, and a third antenna element for WLAN bands. Each element is independently designed and positioned to optimize performance for specific frequency ranges, allowing the antenna system to achieve good return loss across multiple bands simultaneously
Solution Approach 2:
The antenna elements are arranged in a three-dimensional configuration with specific spacing and orientation relationships. The first antenna element is positioned at a first distance from the second antenna element, and the second is positioned at a second distance from the third, creating spatial separation that enables independent optimization of each band's performance without interference
2Power
If high gain is achieved in multi-band LTE antenna, then the signal strength is improved, but the antenna size increases
Solution Approach 1:
Multiple antenna elements are integrated into a single compact antenna assembly with a unified substrate and support structure. The first, second, and third antenna elements share common mounting infrastructure and are positioned in close proximity, achieving high gain through multi-element configuration while maintaining a compact overall form factor suitable for mobile devices
Solution Approach 2:
The antenna design combines multiple functional elements (LTE700/800/900, LTE1700/2100, and WLAN antennas) into a single integrated structure. All elements are mounted on the same substrate with shared support components, achieving high gain across multiple bands while minimizing the total antenna volume through efficient space utilization
3Reliability
If radiation efficiency is improved in multi-band LTE antenna, then the transmission quality is improved, but the device complexity increases
Solution Approach 1:
Each antenna element is designed with optimized local characteristics tailored to its specific frequency band. The first element has dimensions and geometry optimized for LTE700/800/900 bands, the second for LTE1700/2100 bands, and the third for WLAN bands, allowing each to achieve high radiation efficiency in its designated range without requiring complex multi-band designs
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 achieves a return loss greater than -5 dB across 698-960 MHz and -9.3 dB across 2400-2500 MHz, with radiation efficiency greater than 60% in all covered frequency bands, and is easy to produce in high volumes, meeting the needs of the LTE/WiFi mobile device market.
Implementation Method 1
A surface-mounted multi-band LTE antenna with high gain and high efficiency for wireless communication devices applications is presented
Data Source
AI summary
A surface-mounted multi-band LTE antenna that covers the frequency band of 698-960 MHz (LTE 700/800/900 bands) and 2400-2500 GHz (WLAN 2.4G band) is disclosed herein. The antenna preferably has high gain and high radiation efficiency, and is used for a variety of wireless communication devices applications. The surface-mounted multi-band LTE antenna has compact size, wide bandwidth, good return loss, high gain and high radiation efficiency, and no matching circuit is needed.