Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"MICROSTRIP PATCH ANTENNAS"”.
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Ultra-wideband miniaturized microstrip patch antennas for wireless communications: design guidelines and modeling
… creating a demand on efficient and low profile antennas which can be integrated on a printed circuit board. The main objective of this thesis is to study, design, analyze and implement UWB low profile microstrip patch antenna that satisfy UWB technology requirements. Some methods to extend the …
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Development and modelling of new wideband microstrip patch antennas with capacitive feed probes
… feeding mechanism for wideband probe-fed microstrip patch antennas as well as the implementation of a spectral-domain moment-method formulation for the efficient analysis of large, but finite arrays of these elements. Such antenna configurations are very useful in the wireless …
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Analysis and design of reconfigurable multi-band stacked microstrip patch antennas (MSAs) for wireless applications
… demand for smaller low-cost reconfigurable antennas that can be easily integrated with packaging structures. Reconfigurable Microstrip Patch Antennas (MSAs) received great attention in wireless communication systems due to their capability to vary their operating frequency, pattern and …
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Design of broad-band dual-polarized microstrip patch antennas with high port isolation for millimeter-wave 5G applications
… multiple broadband dual linearly polarized antennas are designed covering the frequency band for the next generation of 5G communications around 28 GHz. Dual polarization antennas are employed to increase the capacity of the allocated spectrum through frequency reuse. Techniques for …
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On the accuracy of estimating input impedance of probe-fed air-substrate microstrip patch antennas using the theory of characteristic modes
… impedance of air-substrate, coaxial probe-fed, microstrip patch antennas with arbitrarily shaped patches. Such an antenna with an L-shaped patch is fabricated and experimentally measured, and a case study performed comparing the accuracy of the two methods. The results of both methods require a …
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Multimode and Multiband Microstrip Antennas
… work on the broadband and multiband matching of microstrip patch antennas. Microstrip patch antennas suffer from many constraints on their performance. One major restriction is their narrow impedance bandwidth. An effective method to resolve this is adding more resonators to the antenna structure …
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Bandwidth enhancement techniques for low-profile antennas: Theory and experiment
… for bandwidth enhancement for low-profile antennas. The first method involves the use of coupled resonators. In particular, two cavity-backed slot antennas are coupled through an aperture in a common wall. One cavity-backed slot antenna, of the coupled antenna system, is driven. This …
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Cavity-backed T-fed slot antenna
Cavity-backed slot antennas are experiencing a revival because of the ever-increasing need for low-profile and conformal antennas which have a low radar cross section out of their operating frequency bands. Like thin microstrip patch antennas, cavity-backed slot antennas typically have a narrow …
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Hybridization of the finite element method and the shooting-and-bouncing ray method for scattering and radiation from large and complex targets
… large and complex targets with small cavities or microstrip patch antennas. By combining the two methods, the advantages of each method are retained, while the disadvantages of each method are avoided. Specifically, the speed and efficiency of the SBR method are retained for the analysis of large …
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Ground Plane Slot Structures for Isolation of Cosited Microstrip Antennas
… been shown to reduce coupling between cosited antennas. Although some such structures have already been reported, no analytical model exists to describe their behavior and there are no design guidelines. In this work, the behavior of reported ground plane structures is used as a clue to obtain …
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Microstrip Antennas: Broadband Radiation Patterns Using Photonic Crystal Substrates
… investigate a novel method to develop broadband microstrip (patch) antennas using substrates containing photonic crystals. Photonic crystals are a class of periodic dielectric, metallic, or composite structures that when introduced to an electromagnetic signal can exhibit a forbidden band of …
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ΜΕΛΕΤΗ ΟΡΘΟΓΩΝΙΚΩΝ ΚΑΙ ΤΡΙΓΩΝΙΚΩΝ ΜΙΚΡΟΤΑΙΝΙΑΚΩΝ ΚΕΡΑΙΩΝ
THE ANALYSIS OF MICROSTRIP ANTENNAS WITH RECTANGULAR AND THREE TYPES OF TRIANGULAR PATCHES IS GIVEN IN THIS DISSERTATION. THE THEORETICAL ANALYSIS IS CARRIED OUT BY THE USE OF THE OPTICAL RAYS (GEOMETRIC OPTICS THEORY) METHOD. CLOSED FORM EXPRESSIONS FOR THE TOTAL INTERNAL FIELD (UNDER THE PATCH) …
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Development of compact circular polarized antenna for WLAN application
… in both the transmitter and receiver antennas is important in terms of decreasing transmission losses. The use of circularly polarized antennas presents an attractive solution to achieve this polarization match which allows for more flexibility in the angle between transmitting and …
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Digitally controlled microstrip phased array.
… array. In this thesis, a digitally controlled microstrip phased array is discussed and built. This phased array consists of three parts: firstly, eight stripline 3-bit-PIN diodes-controlled hybrid ring coupled phase shifters, secondly, an equi-spaced half-wavelenth linear array of 8 square …
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Metamaterial Enhanced Wireless Power Transmission System
… A simple WPT demonstration system using microstrip patch antennas (MPAs) confirmed the benefits of the GRIN MTM lens. The WPT demonstration system, MPAs, and GRIN MTM lens were constructed and experimentally tested near 2.45 GHz. The theoretical and experimental gain improvement of the …
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Finite difference time domain analysis of microstrip antenna-circuit modules
Compact microstrip antenna-circuit modules, which could be used as front-ends for future wireless systems applications, require electromagnetic modelling due to the close interaction of the circuit with the antenna. Spectrum crowding and EMC/EMI issues call for modelling of the radiation of such …
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Numerically efficient analysis of microstrip configurations using closed-form Green's functions
A general class of microstrip structures is investigated in this work by using a spatial domain Green's function. The derivation of the closed-form spatial domain Green's functions for the vector and scalar potentials is presented for a microstrip geometry with a substrate and superstrate for which …
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Advanced Time-Domain Finite-Element Method for Electromagnetic Analysis
… by their application to the simulation of microstrip patch antennas.
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Investigation, design and implementation of circular-polarised antennas for satellite mobile handset and wireless communications. Simulation and measurement of microstrip patch and wire antennas for handheld satellite mobile handsets and investigations of polarization polarity, specific absorption rate, and antenna design optimization using genetic algorithms.
… design and implement circularly-polarized antennas to be used for handheld satellite mobile communication and wireless sensor networks. Several antennas such as Quadrifilar Spiral Antennas (QSAs), two arm Square Spiral and stripline or coaxially-fed microstrip patch antennas are developed …
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Development of an antenna system for a relay-based wireless network
… wireless network. Planar geometries of microstrip patch antennas are utilized. The antenna system comprises two antenna modules: a new design of a single antenna for access link and a new design of an antenna array for backhaul link realization. Both antenna specifications are compatible …
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