載波聚合天線設計與模擬

Design and Simulation of Carrier Aggregate Antenna System

黃梓城(Tzu-Cheng Huang)

指導教授 ： 詹益光

淡江大學/工學院/電機工程學系碩士班/碩士(2014年)

https://doi.org/10.6846/TKU.2014.00282

摘要

本篇論文主要研究長期演進技術(Long Term Evolution, LTE)中的載波聚合技術(Carrier Aggregation, CA)，應用於3D印表機所印出的塑膠模板， 載波聚合技術是將多個載波同時使用，故我們會在載波聚合所使用的頻段選取其中幾個作為我們設計的目標頻段，先將選取頻率經過長度計算放置在平板上做模擬，再將模擬好的天線在放入載波聚合的模具上，會產生頻寬不足以及頻率飄移等問題，藉由我們在平面天線優化上的經驗，分別以加寬導線的寬度及調整導線長度來做修正，調整好的天線在多天線上還存在著隔離度的問題，我們分別以不同角度的隔離度來做模擬，得到90度以上的角度隔離度較佳，再加上考慮到天線個數上的問題，以90度為我們的最佳擺放位置。

關鍵字

載波聚合技術 ； 長期演進技術 ； 3D列印技術 ； 系統優化 ； 天線設計

並列摘要

Carrier aggregation, one of the novel technologies considered in the Long Term Evolution (LTE) system, is the technology to aggregate many component carriers together and have the user to transmit the data over the aggregated frequency bands to increase the user’s transmission rate. The frequencies of the frequency bands selected in the carrier aggregation are considered as the target bands. The design and the fabrication of antennas having frequencies associated with the target bands by utilizing 3D printer’s printing technology are considered in this thesis. In the design of carrier frequency aggregated antennas the required lengths of the target bands are first calculated; various shapes of strip lines with the calculated lengths are then fabricated with proper materials and line sizes. The simulated and fabricated antennas are then placed on the carrier frequency aggregated templates to have antenna characteristics such as the antenna bandwidths, target bands center frequencies and transmission characteristics such as s11, s12, s21, s22 are simulated and measured. Through optimization techniques to achieve best antennas characteristics the best combinations of lengths and widths of the strip lines are obtained through running the derived optimization algorithm after satisfactory number of iterations. Various lines placing angles are also considered and simulated to solve the possible isolation problems among the printed carrier aggregated antennas. From simulations the antennas will have the best isolation if their placing angles are more than 90 degrees. 90 degrees line placing angles are selected in the final antennas fabrication to simplify the process of line placing and its fabrication.

並列關鍵字

Carrier Aggregation ； Long Term Evolution ； 3D printing technology ； System Optimization ； Antenna Design

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