Optimizing and evaluating the performanceof a ultra-wideband cpw fed slot antenna
Başlık çevirisi mevcut değil.
- Tez No: 721285
- Danışmanlar: DR. KELLY JR
- Tez Türü: Yüksek Lisans
- Konular: Elektrik ve Elektronik Mühendisliği, Electrical and Electronics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2014
- Dil: İngilizce
- Üniversite: University of Surrey
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 61
Özet
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Özet (Çeviri)
In this project, a Coplanar Wave Guide (CPW) fed hybrid slot antenna, which is combination of two antennas, for wideband applications is proposed. Two different antennas that one was taken from the literature and other one was constructed by the author were constructed and simulated to obtain ultra-wide bandwidth and then the results obtained separately. Afterward, they were nested onto one plane to obtain a combined antenna that can be used to operate over two separated ultra-wide operating bands by using microwave switches. As the technology is progressing very quickly, the required bandwidth is increasing as well and hence wider bandwidth antennas are needed. Thus Ultra wideband antennas have drown attention of the researches since it has the most promising technological advantages for mobile systems particularly for short range systems such as PAN (Personal Area Network). Even though there are a lot of antennas operating with ultra wideband, they have some disadvantages such as unwanted big size. However, patch antennas are very popular as they offer very good features that mentioned in the introduction. Therefore, microstrip antennas became much demanded antennas. nonetheless, the slot antennas that are fed by microstrip feed transmission line are difficult to align because of the etching between both the ground plane and transmission line on the opposite sides of the substrate and microstrip line are not suitable for monolithic fabrication and hence it is not likely to integrate them with active solid-state and passive one and also they are inherently narrow band antenna. As a consequence of these problems, to widen bandwidth the coplanar waveguide transmission lines are introduced. The CPW-fed slot antennas give more advantages than patch antennas such as wider bandwidth, low radiation loss and less dispersion. A compact CPW-fed rectangular hybrid slot antenna of operating in two frequency bands is designed. The overall dimensions of the antenna are 80x60 mm2. The antenna was fabricated and analysed to obtain its properly working properties over the ultra-wideband frequency range. The constructed antenna simulated and results of return loss, voltage standing wave ratio (VSWR) and radiation patterns were obtained. It is observed that the bandwidths stretch from 2.56 to 3.44 GHz in the lower operating frequency range and 3.9 to 4.9 GHz in the upper operating frequency range were achieved which corresponds to 29.3% and 28% fractional bandwidths, respectively. All initial constructions and simulation were done by taking advantages of CST Microwave Studio software.
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