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Radiofrequency antennas designs for ...

Huang, Wei.

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Radiofrequency antennas designs for medical applications.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Radiofrequency antennas designs for medical applications./
作者:	Huang, Wei.
面頁冊數:	128 p.
附註:	Source: Dissertation Abstracts International, Volume: 70-11, Section: B, page: 7091.
Contained By:	Dissertation Abstracts International70-11B.
標題:	Engineering, Electronics and Electrical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3385887
ISBN:	9781109498714

Radiofrequency antennas designs for medical applications.
Huang, Wei.

Radiofrequency antennas designs for medical applications. - 128 p.

Source: Dissertation Abstracts International, Volume: 70-11, Section: B, page: 7091.

Thesis (Ph.D.)--The University of Mississippi, 2009.

Recently, there has been increasing interest in radiofrequency (RF) antennas utilized for medical applications. In this dissertation, we studied the RF antennas for two types of medical informational applications: microwave breast cancer detection and wearable, portable medical eHealth systems.

ISBN: 9781109498714Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

Radiofrequency antennas designs for medical applications.
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245 1 0 $a Radiofrequency antennas designs for medical applications.
300 $a 128 p.
500 $a Source: Dissertation Abstracts International, Volume: 70-11, Section: B, page: 7091.
500 $a Adviser: Ahmed A. Kishk.
502 $a Thesis (Ph.D.)--The University of Mississippi, 2009.
520 $a Recently, there has been increasing interest in radiofrequency (RF) antennas utilized for medical applications. In this dissertation, we studied the RF antennas for two types of medical informational applications: microwave breast cancer detection and wearable, portable medical eHealth systems.
520 $a Among women in the US, breast cancer is the most common cancer and the second-most common cause of cancer death (after lung cancer). Early detection of breast cancer is the key element for reducing mortality. Microwave breast cancer detection, as a new non-ionizing and noninvasive radar-based breast detection method, is one of the promising alternatives. It is based on the contrast in dielectric properties between normal and malignant breast tissue. Compared with conventional clinical screening methods, microwave breast cancer detection may achieve early detection and it has the advantages of being low health risk, noninvasive, comfortable, cost effective, and widely available, which make this new detection method a very prospective clinical complement. One of the biggest challenges for microwave breast cancer detection is the sensor design. The existing sensor designs for breast cancer detection use extra lumped loads as the trade-off for a wider impedance matching bandwidth and are required to be immersed in a matching medium with permittivity similar to breast tissue to reduce the reflection at the air-skin interface. We proposed, designed and implemented a state-of-the-art wideband compact sensor that is specifically designed for breast cancer imaging without the need of matching medium. Two types of wideband DRAs, which are the stair-shape DRA and multi-layer cylindrical DRA were performed both numerically and verified experimentally. A quarter wavelength choke is introduced to reduce the ground plane size. A simple breast model is analyzed and the interaction between sensor and breast tissue is investigated. Additional studies of the sensor's frequency domain characteristics, such as sensitivity analysis, are performed with the tumor in different locations and sizes. For comparison, a dipole antenna and a circular UWB dipole antenna are evaluated along with the stair-shaped DRA on a choked ground plane. The comparisons of their time domain characteristics, such as received pulse waveform and fidelity, are also conducted. A fixed, non-planar 12 - element sensor array that can be positioned directly on the breast to avoid unwanted scattering at the air-skin interface is designed. Also, instead of mechanical rotation, in the experimental setup, the array is able to scan electronically by using RF switch, so that the low precision of sensor position and long scan time requirement can be avoided.
520 $a A generalized DRA size reduction method based on the nature of the modes excited inside a full size antenna by using an electric and/or magnetic conductor is proposed and confirmed by the simulated full size and reduce-sized cylindrical DRA and a rectangular cup DRA fed by a hook-probe.
520 $a In this dissertation, we have also discussed three novel and efficient antennas for wearable, portable medical eHealth systems. An embedded spiral shape microstrip implantable antenna, a button wearable antenna, and an L-shape PIFA antenna are proposed, designed and confirmed experimentally.
590 $a School code: 0131.
650 4 $a Engineering, Electronics and Electrical. $3 626636
690 $a 0544
710 2 $a The University of Mississippi. $3 1019522
773 0 $t Dissertation Abstracts International $g 70-11B.
790 1 0 $a Kishk, Ahmed A., $e advisor
790 $a 0131
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3385887