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Current distribution on linear antennas
Dvořák, Zdeněk ; Puskely, Jan (referee) ; Nováček, Zdeněk (advisor)
Bachelor’s thesis of Current distribution on linear antennas is concerned about possibilities of measuring current distribution on antenna. There is also close peak on measuring principles with help of measuring loop. Current in the loop is inducted in continual proportion to magnetic induction, which is inducted by the current distributed on antenna conductor in proximity of measuring loop. There are also described important parameters of antenna, which can be got from current distribution. This thesis discusses about the method of measure with the sonde in more detail. The expanded program DISTRIB helps to process measured values. This program is modified specially for short and long antennas. There is enclosed the projected submission of laboratory exercise, an exemplary protocol and sinusoidal regression calculation, which is used by the computer program.
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Circularly polarized superstrate antenna for CubeSat
Kratochvíl, Dušan ; Olivová, Jana (referee) ; Raida, Zbyněk (advisor)
The thesis is focused on parameter verification of a circularly polarized antenna with a superstrate, which was designed for CubeSat and presented in the research paper [1]. The frequency band of the designed antenna is from 8.35 to 8.95 GHz. First, the antenna is analyzed without the superstrate layer. Varying the feed position and antenna element dimensions, the changes of reflection coefficient at the input is matched. Second, an overall simulation with a superstrate layer is performed. The antenna substrate was replaced with ARLON 25N microwave substrate available in the laboratory, and the antenna was optimized for this substrate. Finally, such an antenna is fabricated, and its measured parameters are compared with the simulation results.
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Current distribution on linear antennas
Dvořák, Zdeněk ; Puskely, Jan (referee) ; Nováček, Zdeněk (advisor)
Bachelor’s thesis of Current distribution on linear antennas is concerned about possibilities of measuring current distribution on antenna. There is also close peak on measuring principles with help of measuring loop. Current in the loop is inducted in continual proportion to magnetic induction, which is inducted by the current distributed on antenna conductor in proximity of measuring loop. There are also described important parameters of antenna, which can be got from current distribution. This thesis discusses about the method of measure with the sonde in more detail. The expanded program DISTRIB helps to process measured values. This program is modified specially for short and long antennas. There is enclosed the projected submission of laboratory exercise, an exemplary protocol and sinusoidal regression calculation, which is used by the computer program.
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