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Sensing signals of a sensor in digestive tract
Raška, Marek ; Láčík, Jaroslav (referee) ; Raida, Zbyněk (advisor)
Wireless capsule endoscopy (WCE) is a system for capturing images of human digestive tract for medical purposes. The antenna is one of the most important parts of the system. In this report, I present a solution for a system operating in the 2.4 GHz and 915 MHz ISM band. The capsule transmitter contains a conformal loop antenna placed on its outer wall. The planar monopole with a partial ground is used as a receiver. The systems have been verified by numerical simulations with a phantom representing digestive tract. The transmitting modules have the bandwidth of several GHz according to simulations. This allows the antenna to tolerate various effects of living tissues. The receiving antennas have the bandwidth of hundreds of MHz. The path loss of the radio link between antennas operating in 2,4 GHz band is lower than 94 dB for any capsule orientation and location. This does not ensure a sufficient signal strength at the receiving antenna. In contrast, the system operating at 915 MHz ensures sufficient signal level at the receiver.
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S Band Antennas for Cubesat Satellites
Bekeč, Alexander ; Cupal, Miroslav (referee) ; Urbanec, Tomáš (advisor)
This bachelor’s thesis is dedicated to antennas designed for use onboard miniaturized satellites CubeSat. The main goal of the thesis was to examine suitable antennas working in the S-band for use onboard this type of satellites, create their models and simulate them in the software ANSYS HFSS together with the CubeSat frame to find out its impact on the characteristics of antennas. One of these antennas was constructed together with CubeSat frame and measured in the RF anechoic chamber. Besides these, different types of satellite attitude stabilisation were examined, along with their influence on communication with ground station. Minimal half power beamwidths of antennas were analysed for both studied types of single axis stabilisation with consideration of communication with ground station located in the city of Brno.
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Modeling non-conventional monopoles in COMSOL Multiphysics
Zmeškal, Vladimír ; Olivová, Jana (referee) ; Raida, Zbyněk (advisor)
The project deals with the computer simulation of non-conventional monopoles in the program COMSOL Multiphysics. First, the methodology for using COMSOL Multiphysics is described. Second, we concentrate on the design and modeling of three types of non-conventional monopoles: the conical one, the capacitively loaded one, and the drop-shaped one. For each monopole, directivity patterns are displayed. The influence of the variation of antenna dimensions to its parameters is discussed. Monopoles are mutually compared. Finally, models of monopoles are completed by global optimizations techniques: genetic algorithms and particle swarm optimization. That way, a design tool is developed in MATLAB.
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3D textile integrated monopole
Füll, David ; Kufa, Martin (referee) ; Cupal, Miroslav (advisor)
This thesis deals with the design of omnidirectional monopole antennas. Using the parabolic reflector and the directors, the directional characteristics of monopole antennas are modified. This directional antenna, together with the omnidirectional antenna, examines the effect of various materials, the emission characteristics and the input reflection factor, near the antennas. These antennas are made of 3D textile, measured in anechoic chamber and compared to the designed antennas. At the end of the thesis is the summary and evaluation of the result.
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S Band Antennas for Cubesat Satellites
Bekeč, Alexander ; Cupal, Miroslav (referee) ; Urbanec, Tomáš (advisor)
This bachelor’s thesis is dedicated to antennas designed for use onboard miniaturized satellites CubeSat. The main goal of the thesis was to examine suitable antennas working in the S-band for use onboard this type of satellites, create their models and simulate them in the software ANSYS HFSS together with the CubeSat frame to find out its impact on the characteristics of antennas. One of these antennas was constructed together with CubeSat frame and measured in the RF anechoic chamber. Besides these, different types of satellite attitude stabilisation were examined, along with their influence on communication with ground station. Minimal half power beamwidths of antennas were analysed for both studied types of single axis stabilisation with consideration of communication with ground station located in the city of Brno.
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Receiving Signals From A Sensor In The Digestive Tract
Raška, Marek
Wireless capsule endoscopy is a system for capturing images of human digestive tract for medical purposes. In this report, I present an antenna solution for a system operating in the 915 MHz ISM band. The capsule transmitter contains a conformal slot loop antenna placed on its outer wall. The planar monopole with a partial ground is used as a receiver. The system has been verified by numerical simulations with a phantom representing part of a human body. Low path loss of the radio link between antennas ensures sufficient signal strength at the receiver for any capsule orientation and location.
|
|
|
Sensing signals of a sensor in digestive tract
Raška, Marek ; Láčík, Jaroslav (referee) ; Raida, Zbyněk (advisor)
Wireless capsule endoscopy (WCE) is a system for capturing images of human digestive tract for medical purposes. The antenna is one of the most important parts of the system. In this report, I present a solution for a system operating in the 2.4 GHz and 915 MHz ISM band. The capsule transmitter contains a conformal loop antenna placed on its outer wall. The planar monopole with a partial ground is used as a receiver. The systems have been verified by numerical simulations with a phantom representing digestive tract. The transmitting modules have the bandwidth of several GHz according to simulations. This allows the antenna to tolerate various effects of living tissues. The receiving antennas have the bandwidth of hundreds of MHz. The path loss of the radio link between antennas operating in 2,4 GHz band is lower than 94 dB for any capsule orientation and location. This does not ensure a sufficient signal strength at the receiving antenna. In contrast, the system operating at 915 MHz ensures sufficient signal level at the receiver.
|
|
|
3D textile integrated monopole
Füll, David ; Kufa, Martin (referee) ; Cupal, Miroslav (advisor)
This thesis deals with the design of omnidirectional monopole antennas. Using the parabolic reflector and the directors, the directional characteristics of monopole antennas are modified. This directional antenna, together with the omnidirectional antenna, examines the effect of various materials, the emission characteristics and the input reflection factor, near the antennas. These antennas are made of 3D textile, measured in anechoic chamber and compared to the designed antennas. At the end of the thesis is the summary and evaluation of the result.
|
|
|
Modeling non-conventional monopoles in COMSOL Multiphysics
Zmeškal, Vladimír ; Olivová, Jana (referee) ; Raida, Zbyněk (advisor)
The project deals with the computer simulation of non-conventional monopoles in the program COMSOL Multiphysics. First, the methodology for using COMSOL Multiphysics is described. Second, we concentrate on the design and modeling of three types of non-conventional monopoles: the conical one, the capacitively loaded one, and the drop-shaped one. For each monopole, directivity patterns are displayed. The influence of the variation of antenna dimensions to its parameters is discussed. Monopoles are mutually compared. Finally, models of monopoles are completed by global optimizations techniques: genetic algorithms and particle swarm optimization. That way, a design tool is developed in MATLAB.
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