語系:
繁體中文
English
說明(常見問題)
回圖書館首頁
手機版館藏查詢
登入
回首頁
切換:
標籤
|
MARC模式
|
ISBD
Use of Computational Electromagnetic...
~
Chen, Heng.
FindBook
Google Book
Amazon
博客來
Use of Computational Electromagnetics to Enhance the Accuracy and Efficiency of Antenna Pattern Measurements.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Use of Computational Electromagnetics to Enhance the Accuracy and Efficiency of Antenna Pattern Measurements./
作者:
Chen, Heng.
出版者:
Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:
152 p.
附註:
Source: Dissertations Abstracts International, Volume: 80-12, Section: B.
Contained By:
Dissertations Abstracts International80-12B.
標題:
Electrical engineering. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13862264
ISBN:
9781392250310
Use of Computational Electromagnetics to Enhance the Accuracy and Efficiency of Antenna Pattern Measurements.
Chen, Heng.
Use of Computational Electromagnetics to Enhance the Accuracy and Efficiency of Antenna Pattern Measurements.
- Ann Arbor : ProQuest Dissertations & Theses, 2019 - 152 p.
Source: Dissertations Abstracts International, Volume: 80-12, Section: B.
Thesis (Ph.D.)--Syracuse University, 2019.
This item must not be sold to any third party vendors.
The objective of this dissertation is to illustrate that computational electromagnetics can be used to improve the accuracy and efficiency of antenna pattern measurements.This can be accomplished in many different ways, such as moving a single probe over the measurement plane to generate accurate planar near field to far field transformation methodology over the classical Fourier based modal expansion methods. Also, one can use an array of probes instead of moving a single probe over the measurement plane to eliminate the inaccuracy of a mechanical movement of the probe antenna over a large planar surface and make the measurement methodology more accurate and efficient. Another unique feature of this methodology is that as long as the sizes of the measurement planes are chosen to be approximately equal to or larger than the size of the actual source plane of the antenna under test, one is guaranteed to obtain the accurate results.In addition, other two approaches are proposed which under some conditions to further increase the efficiency of the whole processes of the methodology. For example, for a linearly polarized antenna, performance is often described in terms of its principal E-plane and H-plane patterns. If that is the goal, then one can use a planar dipole probe array to measure the near field over a sector and then use that to obtain the far field pattern along principal planes with engineering accuracy and so precision mechanical measurement gadgets will not be required and thus minimizing the cost and speeding up the measurement process. Another scenario is that the near field data contain complex numbers, and it's very difficult to measure the complex data, especially for high frequency applications, say at M, V and W-bands. One can still obtain acceptable far field results by using the amplitude only data of the near field measurements, which significantly reduced the workload of the measurements, hence increased the efficiency.The whole methodology is accomplished by solving for the equivalent magnetic current over a plane near the original source antenna under test and then employing the Method of Moments approach to solve for the equivalent magnetic currents on this fictitious surface. The two components of the equivalent currents can be solved independently from the two components of the measured electric fields. The resultant method of moments matrix equation can be solved very efficiently and accurately by using the iterative conjugate gradient method enhanced through the incorporation of the Fast Fourier Transform techniques. In all these approaches, there is no need to incorporate probe correction unlike in the existing approaches, no need to satisfy the Nyquist sampling criteria and a super resolution can be achieved in the solution of the equivalent magnetic current to predict the operation of the antenna. Also, the presence of evanescent fields does not make this methodology unstable unlike the Fourier based techniques.Sample numerical results are presented to illustrate the potential of a novel planar near field to far field transformation for the planar near field measurement technique.
ISBN: 9781392250310Subjects--Topical Terms:
649834
Electrical engineering.
Use of Computational Electromagnetics to Enhance the Accuracy and Efficiency of Antenna Pattern Measurements.
LDR
:04264nmm a2200325 4500
001
2263975
005
20200331094433.5
008
220629s2019 ||||||||||||||||| ||eng d
020
$a
9781392250310
035
$a
(MiAaPQ)AAI13862264
035
$a
(MiAaPQ)syr:12118
035
$a
AAI13862264
040
$a
MiAaPQ
$c
MiAaPQ
100
1
$a
Chen, Heng.
$3
3541074
245
1 0
$a
Use of Computational Electromagnetics to Enhance the Accuracy and Efficiency of Antenna Pattern Measurements.
260
1
$a
Ann Arbor :
$b
ProQuest Dissertations & Theses,
$c
2019
300
$a
152 p.
500
$a
Source: Dissertations Abstracts International, Volume: 80-12, Section: B.
500
$a
Publisher info.: Dissertation/Thesis.
500
$a
Advisor: Sarkar, Tapan K.
502
$a
Thesis (Ph.D.)--Syracuse University, 2019.
506
$a
This item must not be sold to any third party vendors.
520
$a
The objective of this dissertation is to illustrate that computational electromagnetics can be used to improve the accuracy and efficiency of antenna pattern measurements.This can be accomplished in many different ways, such as moving a single probe over the measurement plane to generate accurate planar near field to far field transformation methodology over the classical Fourier based modal expansion methods. Also, one can use an array of probes instead of moving a single probe over the measurement plane to eliminate the inaccuracy of a mechanical movement of the probe antenna over a large planar surface and make the measurement methodology more accurate and efficient. Another unique feature of this methodology is that as long as the sizes of the measurement planes are chosen to be approximately equal to or larger than the size of the actual source plane of the antenna under test, one is guaranteed to obtain the accurate results.In addition, other two approaches are proposed which under some conditions to further increase the efficiency of the whole processes of the methodology. For example, for a linearly polarized antenna, performance is often described in terms of its principal E-plane and H-plane patterns. If that is the goal, then one can use a planar dipole probe array to measure the near field over a sector and then use that to obtain the far field pattern along principal planes with engineering accuracy and so precision mechanical measurement gadgets will not be required and thus minimizing the cost and speeding up the measurement process. Another scenario is that the near field data contain complex numbers, and it's very difficult to measure the complex data, especially for high frequency applications, say at M, V and W-bands. One can still obtain acceptable far field results by using the amplitude only data of the near field measurements, which significantly reduced the workload of the measurements, hence increased the efficiency.The whole methodology is accomplished by solving for the equivalent magnetic current over a plane near the original source antenna under test and then employing the Method of Moments approach to solve for the equivalent magnetic currents on this fictitious surface. The two components of the equivalent currents can be solved independently from the two components of the measured electric fields. The resultant method of moments matrix equation can be solved very efficiently and accurately by using the iterative conjugate gradient method enhanced through the incorporation of the Fast Fourier Transform techniques. In all these approaches, there is no need to incorporate probe correction unlike in the existing approaches, no need to satisfy the Nyquist sampling criteria and a super resolution can be achieved in the solution of the equivalent magnetic current to predict the operation of the antenna. Also, the presence of evanescent fields does not make this methodology unstable unlike the Fourier based techniques.Sample numerical results are presented to illustrate the potential of a novel planar near field to far field transformation for the planar near field measurement technique.
590
$a
School code: 0659.
650
4
$a
Electrical engineering.
$3
649834
650
4
$a
Electromagnetics.
$3
3173223
690
$a
0544
690
$a
0607
710
2
$a
Syracuse University.
$b
Electrical Engineering and Computer Science.
$3
3169988
773
0
$t
Dissertations Abstracts International
$g
80-12B.
790
$a
0659
791
$a
Ph.D.
792
$a
2019
793
$a
English
856
4 0
$u
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13862264
筆 0 讀者評論
館藏地:
全部
電子資源
出版年:
卷號:
館藏
1 筆 • 頁數 1 •
1
條碼號
典藏地名稱
館藏流通類別
資料類型
索書號
使用類型
借閱狀態
預約狀態
備註欄
附件
W9416209
電子資源
11.線上閱覽_V
電子書
EB
一般使用(Normal)
在架
0
1 筆 • 頁數 1 •
1
多媒體
評論
新增評論
分享你的心得
Export
取書館
處理中
...
變更密碼
登入