Дисертації з теми "Microwave patch antennas"
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SaÌnchez-HernaÌndez, David A. "Active microstrip patch antennas for monolithic microwave integrated circuits (MMICs)." Thesis, King's College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362513.
Повний текст джерелаAdnan, S. "Ultra-wideband antenna design for microwave imaging applications. Design, optimisation and development of ultra-wideband antennas for microwave near-field sensing tools, and study the matching and radiation purity of these antennas within near field environment." Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5750.
Повний текст джерелаAdnan, Shahid. "Ultra-wideband antenna design for microwave imaging applications : design, optimisation and development of ultra-wideband antennas for microwave near-field sensing tools, and study the matching and radiation purity of these antennas within near field environment." Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5750.
Повний текст джерелаLim, Beng Wee. "Design and modelling of a corner fed circularly polarised patch antenna." Thesis, Northumbria University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245284.
Повний текст джерелаVlasits, Tamas. "Modelling and application of a cross-aperture coupled single feed circularly polarised patch antenna." Thesis, Northumbria University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245262.
Повний текст джерелаMikulášek, Tomáš. "Dvoupásmová anténa pro Globální navigační satelitní systém." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218040.
Повний текст джерелаDonado, Morcillo Carlos Alberto. "Development of lightweight and low-cost microwave components for remote-sensing applications." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/51733.
Повний текст джерелаDonado, Morcillo Carlos Alberto. "Development of lightweight and low-cost microwave components for remote-sensing applications." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47532.
Повний текст джерелаJohnson, Matthew H. "Analysis, design and fabrication of a frangible tower for use with sideband reference glide slope systems." Ohio : Ohio University, 1996. http://www.ohiolink.edu/etd/view.cgi?ohiou1178308139.
Повний текст джерелаVerma, Akhilesh. "Design and development of microwave patch antennas using conductive polymers." Thesis, 2012. http://hdl.handle.net/2440/95876.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Electrical and Electronics Engineering, 2012
De, Haaij David Martin. "The design of feed networks for enhanced bandwidth operation of microstrip patch antennas." Diss., 2003. http://hdl.handle.net/2263/28104.
Повний текст джерелаDissertation (M Eng (Electronic Engineering))--University of Pretoria, 2006.
Electrical, Electronic and Computer Engineering
unrestricted
Chiu, Chiung-Hao, and 邱炯豪. "Design of Broadband, High Gain Microstrip Patch Antennas for Microwave Virus Sanitizer." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/91955557309475964633.
Повний текст джерела國立臺灣大學
電信工程學研究所
99
A concept for designing a broadband aperture-coupled microstrip patch antenna is presented in this thesis. The proposed patch antenna is fed by a coupling aperture, offset from the patch center. This generates a fictitious open circuit within the resonating edges of the patch, and therefore, an additional resonant frequency is produced and a wide impedance bandwidth can be obtained. Also, a broadband patch array using the patch as its radiating elements is presented. All the designs are fabricated and verified via both measurements and simulations. Then, the proposed patch array is integrated with an off-the-shelf power amplifier module, and the power density radiated by the system is further characterized. Finally, this system is used as a microwave virus sanitizer to eliminate the H1N1 viruses, and a series of experiments is setup and performed. The associated results are also presented.
Wang, Yuan-Hong, and 王源宏. "Multilayer substrate electrical parameter extraction at microwave band and series fed patch antennas." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/07286127826604600229.
Повний текст джерела國立臺灣大學
電信工程學研究所
104
This thesis is divided into two parts. First of all, based on transmission-line theory,different kinds of transmission line are used, for example : a microstrip line, strip line, coplanar waveguide transmission line to derive different types of properties, and then take advantage of the characteristics of the transmission line to obtain the electrical characteristic parameters of substrate. We will use similarity matrix which has the same eigenvalues and use the ring resonator method to extract and verify the accuracy of the parameters. Also additional effects, such as surface roughness and a variety of transmission lines and electrical characteristic parameters of multilayer substrate will be extracted. The second part is about antenna design, including antennas used in 5G communications base station antennas and 24GHz automotive collision avoidance radar.The antenna for 5G uses the substrate from Boardtek and we use a series-fed antenna to increase antenna gain. Equal amplitude excitation is used at Ka band, at the center frequency of 38GHz. Next, the antenna at 24GHz for automotive radar is designed using Rogers RO4003C substrate. In order to suppress the amplitude of sidelobe, a taper distribution of excitation is used.
Sai, Ahn-Long, and 施安龍. "Design and Application of Miniaturized Patch Antenna for Microwave Communication." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/vbs4x7.
Повний текст джерела國立臺灣科技大學
電子工程系
94
In this paper, we will design miniaturized and wideband antennas in order to apply in different environments. We will discuss about three kinds of antennas, meander-line antennas, bow-tie antennas and untra-wide band antennas in three sections. In these sections, we will do simulations by full-wave simulation software IE3D and realize them using FR-4. After all, we will measure the S parameters of three antennas by using a network analyzer and the patterns in a chamber to understand the real characteristics of three antennas. It is important to combine an antenna with the circuit for a completed system. We will also discuss how to realize the impedance matching between the antenna and the circuit to achieve the biggest power output in this paper.
Ασημάκης, Νικόλαος. "Διαγνωστικές και θεραπευτικές τεχνικές με χρήση ηχητικών και μικροκομματικών συχνοτήτων". Thesis, 2008. http://nemertes.lis.upatras.gr/jspui/handle/10889/945.
Повний текст джерелаAs the evolution in the field of biomedical science and technology is continuous, the research focuses mainly on the improvement of existent clinical techniques and the development of new ones, aiming to the most accurate and safe diagnosis and treatment. In the present thesis, the usage of two frequency bands is investigated, the microwave and sound frequencies for diagnostic functional brain applications. Despite the fact that ultrasounds have been utilized in clinical practice, the references regarding the application of sound frequencies in medical diagnosis are restrained in international literature. In the present thesis the development of a system for diagnostic brain applications operating at sound frequencies is studied. In the first two chapters the basic principles of acoustics and the physical principles of the interaction of sound waves with biological tissue (including physical phenomena of reflection, diffraction, transmission and absorption of sound) are described. More specifically, the problem of the interaction of sound waves with the human brain tissues is theoretically modeled and studied. In the third chapter theoretical analysis and basic principles of the suggested method are given together with the basic points of its practical implementation that include analysis of the piezoelectric phenomenon, the respective piezoelectric transducers and sound signal receiver. Microwaves have been used in many diagnostic and therapeutic techniques both at research level and in clinical practice. Herein, a theoretical study of two multi-frequency conformal microstrip patch antennas is performed, in order to use them in conjunction with sensitive microwave radiometry receivers. In chapter 4 the basic technology and the basic operation principles of the passive diagnostic method with microwaves (microwave radiometry) are described. The suggested conformal antennas are modeled (chapter 5) and studied using the electromagnetic simulation tool HFSS that implements the finite element method (FEM). The properties of these antennas and their focusing ability on specific brain areas are presented at 2 – 3.5 GHz in two different head models.
Abdulhasan, R. A., R. Alias, K. N. Ramli, F. C. Seman, and Raed A. Abd-Alhameed. "High gain CPW‐fed UWB planar monopole antenna‐based compact uniplanar frequency selective surface for microwave imaging." 2019. http://hdl.handle.net/10454/16994.
Повний текст джерелаIn this article, a novel uniplanar ultra‐wideband (UWB) stop frequency selective surface (FSS) was miniaturized to maximize the gain of a compact UWB monopole antenna for microwave imaging applications. The single‐plane FSS unit cell size was only 0.095λ × 0.095λ for a lower‐operating frequency had been introduced, which was miniaturized by combining a square‐loop with a cross‐dipole on FR4 substrate. The proposed hexagonal antenna was printed on FR4 substrate with coplanar waveguide feed, which was further backed at 21.6 mm by 3 × 3 FSS array. The unit cell was modeled with an equivalent circuit, while the measured characteristics of fabricated FSS array and the antenna prototypes were validated with the simulation outcomes. The FSS displayed transmission magnitude below −10 dB and linear reflection phase over the bandwidth of 2.6 to 11.1 GHz. The proposed antenna prototype achieved excellent gain improvement about 3.5 dBi, unidirectional radiation, and bandwidth of 3.8 to 10.6 GHz. Exceptional agreements were observed between the simulation and the measured outcomes. Hence, a new UWB baggage scanner system was developed to assess the short distance imaging of simulated small metallic objects in handbag model. The system based on the proposed antenna displayed a higher resolution image than the antenna without FSS.
The full-text of this article will be released for public view at the end of the publisher embargo on 29 Mar 2020.
Ασημάκης, Νικόλαος. "Ανάπτυξη συστημάτων με χρήση μη ιοντιζουσών ακτινοβολιών για διαγνωστικές εφαρμογές και ανίχνευση εγκεφαλικής δραστηριότητας". Thesis, 2010. http://nemertes.lis.upatras.gr/jspui/handle/10889/4014.
Повний текст джерелаAs progress in the field of biomedical science and technology is continuous, the research focuses mainly on the improvement of existing clinical techniques and the development of new ones, aiming at the most accurate and safe diagnosis and treatment. In the present thesis, passive diagnosis in the non ionizing radiation regime and especially two frequency bands, microwave and acoustic frequencies, are used for diagnostic functional brain applications. Despite the fact that ultrasounds have been utilized in clinical practice, the references regarding the application of acoustic waves in medical diagnosis are restrained in international literature. In the present thesis the development of a system for diagnostic brain applications operating at acoustic frequencies is studied. In the first two chapters the basic principles of acoustics and the physical principles of the interaction of acoustic waves with biological tissue (including physical phenomena of reflection, diffraction, transmission and absorption of sound) are described. More specifically, the problem of the interaction of acoustic waves with the human brain tissues is theoretically modeled and studied. In the third chapter theoretical analysis is carried out and the basic operation principles of the suggested method for monitoring brain activity in acoustic frequencies are described. Simulations are performed using the MATLAB software and the respective numerical results are presented. Completing the first part of the thesis, the fundamentals of the system’s practical implementation are introduced in the fourth chapter. All system modules are described and the results of the implementation study through experiments using phantoms are presented. Microwaves have been used in many diagnostic and therapeutic techniques both at research level and in clinical practice. Herein, a theoretical study and implementation of various multi-frequency conformal microstrip patch antennas are performed, and finally they are used in conjunction with a sensitive microwave radiometry receiver. In chapter 5 the basic technology and the basic operation principles of the passive diagnostic method with microwaves (microwave radiometry) are described, while in chapter 6 the suggested conformal antennas are modeled and studied using the electromagnetic simulation tool HFSS that implements the finite element method (FEM). Moreover, the properties of these antennas and their focusing ability on specific brain areas are presented at 2 – 3.3 GHz in two different head models. Finally, a few are materialized in Rogers 4350B dielectric substrate and two of them are used together with a Dicke switch type radiometer for experimental measurements with phantoms (chapter 7). The combination of the aforementioned systems in a common implementation and the realization of common experimental measurements in both frequency bands is a very significant prospective which can optimize the performance of each methodology, by collecting and combining different types of information originating from the same event.
Alibakhshikenari, M., B. S. Virdee, C. H. See, Raed A. Abd-Alhameed, F. Falcone, and E. Limiti. "Super-Wide Impedance Bandwidth Planar Antenna for Microwave and Millimeter-Wave Applications." 2019. http://hdl.handle.net/10454/17098.
Повний текст джерелаA feasibility study of a novel configuration for a super-wide impedance planar antenna is presented based on a 2 × 2 microstrip patch antenna (MPA) using CST Microwave Studio. The antenna comprises a symmetrical arrangement of four-square patches that are interconnected to each other with cross-shaped high impedance microstrip lines. The antenna array is excited through a single feedline connected to one of the patches. The proposed antenna array configuration overcomes the main drawback of conventional MPA with a narrow bandwidth that is typically <5%. The antenna exhibits a super-wide frequency bandwidth from 20 GHz to 120 GHz for S11 < −15 dB, which corresponds to a fractional bandwidth of 142.85%. The antenna’s performance of bandwidth, impedance match, and radiation gain were enhanced by etching slots on the patches. With the inclusion of the slot, the maximum radiation gain and efficiency of the MPA increased to 15.11 dBi and 85.79% at 80 GHz, which showed an improvement of 2.58 dBi and 12.54%, respectively. The dimension of each patch antenna was 4.3 × 5.3 mm2 . The results showed that the proposed MPA is useful for various existing and emerging communication systems such as ultra-wideband (UWB) communications, RFID systems, massive multiple-output multiple-input (MIMO) for 5G, and radar systems.
This work was partially supported by the Innovation Program under grant agreement H2020-MSCA-ITN-2016 SECRET-722424 and financial support from the UK Engineering and Physical Sciences Research Council (EPSRC) under grant EP/E022936/1.