針對第四代行動電話行動通信標準(4G)的多頻帶天線小型化設計

Abstract

本篇論文提出兩種類型天線之設計。一是多頻帶背接金屬共平面波導天線之研究，另一主題是探討多頻帶平面倒F型天線。在第一部分中，為設計多頻帶微小化天線，主要是要涵蓋長期演進系統所要求615MHz到808MHz & 1520MHz 到 2049MHz &2390 MHz到2790MHZ這數個頻帶。天線架構是以背接金屬共平面波導饋入的方式設計，第一步先設計符合低頻帶要求的天線主體架構，再透過多電流路徑與路徑寬度的方式以提供多頻頻帶及提高低頻頻寬。 在第二部分中，主要以手持式裝置應用為主的多頻帶微小化天線並涵蓋長期演進系統所要求頻段為698MHz到960MHz &2500MHz到2690MHz。天線架構以PIFA的方式設計，進而達到小型化的要求，並且利用多電流路徑與短路點特性的方式共振出多的電流路路徑，以達到設計的要求。

The paper studies and proposes two designs of antennas. One is the design of the multi band CBCPW (conductor-backed coplanar waveguide) antenna and another design is multi-band PIFA (Planar Inverted-F Antennas).

The first proposal antenna is designed to the triple-bands miniaturized antenna, which cover 615MHz to 808MHz, 1520MHz to 2049MHz and 2390MHz to 2790MHz frequency bands of the LTE system specification. The antenna structure is feed by the conductor-backed coplanar waveguide structure. We design the main structure of the antenna to support the lower frequency band at first. And then, we use the technique of changing of the current path length and width to provide the multi frequency band and increase the antenna bandwidth for the lower frequency band. The second one is designed as a dual band antenna for mobile application, which covers 698MHz to 960MHz and 2500MHz to 2690MHz frequency bands of the LTE system specification. The antenna is designed using PIFA structures. We meet the designing requirement by changing the current path and utilizing the characteristic of shorting pin to increase addition current path to dual bands.