國立高雄大學圖資館 |

語系: 繁體中文

說明(常見問題)

圖資館首頁

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Bandwidth enhancement of a compact a...

Celebi, Adem.

Bandwidth enhancement of a compact antenna by parasitic elements.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Bandwidth enhancement of a compact antenna by parasitic elements.
作者:	Celebi, Adem.
面頁冊數:	116 p.
附註:	Source: Dissertation Abstracts International, Volume: 76-12(E), Section: B.
附註:	Adviser: Thomas Wong.
Contained By:	Dissertation Abstracts International76-12B(E).
標題:	Electrical engineering.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3664030
ISBN:	9781339099491

Bandwidth enhancement of a compact antenna by parasitic elements.
Celebi, Adem.

Bandwidth enhancement of a compact antenna by parasitic elements. - 116 p.

Source: Dissertation Abstracts International, Volume: 76-12(E), Section: B.

Thesis (Ph.D.)--Illinois Institute of Technology, 2015.

Antenna structures are playing a major role in wireless systems, including communication systems, radars, satellite systems, information networks and medical diagnostic systems. In these systems, external antennas are widely used, especially for devices with metallic enclosures. One of the common requirements for the external antennas is the need for achieving small dimension while keeping the antenna performance optimized. In this respect, electrically small antennas (ESAs) are employed. Realizing the design requirements of an ESA has been a challenge for antenna designers because some of the parameters such as large bandwidth and reasonably high input impedance are in conflict with the small antenna dimensions. A compact antenna with parasitic elements for bandwidth enhancement is proposed to address these issues for use with mobile devices. Loading the known antenna topologies with other structures could improve the design parameters such as gain, bandwidth, impedance, and bandwidth for antenna topologies which are impossible to achieve with the conventional antennas. In this respect, a parasitic element with a smaller scale is placed within the structure to obtain a second resonance close to the main antennas resonance for an increased bandwidth without increasing the overall dimensions of the antenna. This composite antenna is expected to have relatively high input impedances for each of the resonances, thus minimizing the need for an input matching network. A review of related prior work of antenna structures is presented to gain insight into the recent developments and methods in the field. The minimum quality factor (Q) and maximum gain of the ESA designs and their theoretical limitations are then discussed. The features of the antenna designs discussed in the review are used as foundation of the developed antenna structures. The properties and a fabrication method of the proposed antenna are then discussed. A commercially available software package based on finite element method is employed to aid in the antenna design. Several antenna prototypes are constructed to verify the design and the accuracy of the simulations. The prototypes are then tested using network analyzers and an RF anechoic chamber with the aim of characterizing the antenna performance in terms of antenna bandwidth and input impedance.

ISBN: 9781339099491Subjects--Topical Terms:

454503
Electrical engineering.

Bandwidth enhancement of a compact antenna by parasitic elements.
LDR:03199nmm a2200265 4500 001 476045
005 20160418090145.5
008 160517s2015 ||||||||||||||||| ||eng d
020 $a 9781339099491
035 $a (MiAaPQ)AAI3664030
035 $a AAI3664030
040 $a MiAaPQ $c MiAaPQ
100 1 $a Celebi, Adem. $3 730291
245 1 0 $a Bandwidth enhancement of a compact antenna by parasitic elements.
300 $a 116 p.
500 $a Source: Dissertation Abstracts International, Volume: 76-12(E), Section: B.
500 $a Adviser: Thomas Wong.
502 $a Thesis (Ph.D.)--Illinois Institute of Technology, 2015.
520 $a Antenna structures are playing a major role in wireless systems, including communication systems, radars, satellite systems, information networks and medical diagnostic systems. In these systems, external antennas are widely used, especially for devices with metallic enclosures. One of the common requirements for the external antennas is the need for achieving small dimension while keeping the antenna performance optimized. In this respect, electrically small antennas (ESAs) are employed. Realizing the design requirements of an ESA has been a challenge for antenna designers because some of the parameters such as large bandwidth and reasonably high input impedance are in conflict with the small antenna dimensions. A compact antenna with parasitic elements for bandwidth enhancement is proposed to address these issues for use with mobile devices. Loading the known antenna topologies with other structures could improve the design parameters such as gain, bandwidth, impedance, and bandwidth for antenna topologies which are impossible to achieve with the conventional antennas. In this respect, a parasitic element with a smaller scale is placed within the structure to obtain a second resonance close to the main antennas resonance for an increased bandwidth without increasing the overall dimensions of the antenna. This composite antenna is expected to have relatively high input impedances for each of the resonances, thus minimizing the need for an input matching network. A review of related prior work of antenna structures is presented to gain insight into the recent developments and methods in the field. The minimum quality factor (Q) and maximum gain of the ESA designs and their theoretical limitations are then discussed. The features of the antenna designs discussed in the review are used as foundation of the developed antenna structures. The properties and a fabrication method of the proposed antenna are then discussed. A commercially available software package based on finite element method is employed to aid in the antenna design. Several antenna prototypes are constructed to verify the design and the accuracy of the simulations. The prototypes are then tested using network analyzers and an RF anechoic chamber with the aim of characterizing the antenna performance in terms of antenna bandwidth and input impedance.
590 $a School code: 0091.
650 4 $a Electrical engineering. $3 454503
690 $a 0544
710 2 $a Illinois Institute of Technology. $3 212580
773 0 $t Dissertation Abstracts International $g 76-12B(E).
790 $a 0091
791 $a Ph.D.
792 $a 2015
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3664030