Results 131 to 140 of about 11,368 (233)

A reconfigurable CPW antenna for GPS, GSM and WLAN applications

open access: yes, 2010
Copyright @ 2011 IEEEMultiband reconfigurable antennas are receiving increasing importance in modern wireless communication systems supporting multiservice applications.
AbuTarboush, HF   +4 more
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60GHz Circularly Polarized Patch Antenna Fed By Microstrip-Line

open access: yes, 2007
本論文中,我們主要是提出一種用微帶線饋入的圓極化微帶天線,經由模態分析法加以分析。首先將針對各式圓極化微帶天線進行介紹。 理論分析以共振腔模型為基礎,求解圓形微帶天線在共振腔中的模態。由模態分析的結果,可推導出在共振腔金屬面上的電流分布情形。而在本論文中是採直接饋入圓形微帶天線,但爲了增加頻寬和極化程度,經由結合循序旋轉的設計技巧,在此設計了微帶線饋入之圓形極化微帶線天線陣列。從模擬與量測結果當中,我們可以明顯的發現使用循序旋轉的技巧的 1x2 陣列天線,在頻寬上有明顯的提升 ...
賴宗民, Lai, Tzung-Ming
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Estimation of dielectric constant for various standard materials using microstrip ring resonator

open access: yes, 2017
Microstrip ring resonator (MRR) is known for dielectric constant determination and many studies used Teflon as a standard sample. However, there are many other materials available which able to perform better or equivalence as the Teflon in calibrating ...
You, Kok Yeow   +3 more
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Circularly Polarized Patch Array Antenna Fed by Microstrip Line

open access: yes, 2007
由於可以降低多重路徑反射和干擾,圓極化的技術被廣泛的應用於微米波頻段。微帶天線也因為它的輕薄、短小、架構簡單和易於與其他電路結合的優點而被大家所熟知。但是,微帶天線有一個不被大家所喜愛的缺點,就是它的頻寬非常的窄,這個缺點同時也嚴重地限制了微帶天線的應用。 爲了要克服微帶天線的窄頻的缺點,吾人採用了循序旋轉的饋入技術,這個技術不但改進了微帶天線的阻抗頻寬,同時也增加了它的圓極化頻寬。 在這篇論文中,幾種利用了循序旋轉饋入技術的圓極化微帶陣列天線被提出 ...
Mu, Wei-Yu, 穆威宇
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Design of a UWB wide-slot antenna and a hemispherical array for breast imaging

open access: yes, 2009
A microstrip, fork fed, wide slot antenna, printed on high permittivity substrate has been developed for the transmission of ultra wide bandwidth (UWB) signals into the breast.
Gibbins, David   +5 more
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An Antenna Array for the Galileo System with Beamforming Capabilities

open access: yes, 2006
Future navigation services provided by the upcoming Galileo satellite system will require corresponding improvements on the navigation receiving systems. The first part of any navigation receiving system is the antenna or antenna terminal.
Dreher, Achim, Schittler Neves, Eduardo
core  

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