Enhancement of Loop Filter Characteristics with EBG structure.

• Main Authors: yu-jun Siao, 蕭宇君
• Other Authors: Kwong-Kau Tiong
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/85537787503249998238

碩士 === 國立臺灣海洋大學 === 電機工程學系 === 99 === This paper presents periodic structure theory is also known as electromagnetic energy band structure (Electro-Magnetic Band-Gap, EBG), because it can inhibit the surface wave in phase with the reflection phase characteristics, the current application mainly for the EBG antenna gain and Performance improvement, and we are based on the principle of inhibition of surface waves along the loop filter designed in this for the frequency band used in wireless local area network (Wireless LAN, WLAN; 2.4GHz ~ 2.483GHz) to propose a corresponding bandstop filter The structure of the coupled microstrip line mounting means to verify experimental results The first part of the periodic structure to design the main resonant frequency according to the formula to determine the size of periodic structures. Then CST (CST MICROWAVE STUDIO) electromagnetic simulation software package, to adjust its current path and geometric structure of the circuit parameters to meet the requirements of the resonant frequencies and generate a better insertion loss values, and to measure and to verify. Second part of the traditional microstrip ring filter as the basis for the design of the first part of the periodic structure, combined with the two notch features, the filter circuit area of the case remain the same, the filter is fed microstrip placed under periodic structure with a line, compared with no periodic structure into the relative bandwidth can be increased from 9% to 21%. Confirmed that in addition to this periodic structure can improve the gain of the antenna, the filter has to do with the combination of effective.