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This work presents design of Microstrip Frequency Selective Surface (MFSS)s to be fixed into the apertures of horn antennas for pre-filtering unwanted signals at 4GHz, 9 GHz. Thus integration of the antenna and band-pass filter is achieved into a single module so that a pre-filtering process can be carried out when signal is received by the antenna that makes the entire system be more compact and...
This paper presents impulse generator for ground penetrating radar (GPR) transmitter based on multiplication effect of avalanche transistor. Different impulse generators are designed using single and multiple avalanche transistors. Circuits with multiple transistors used both serial and parallel connections of transistors. 100 kHz signal with 2.2 V and 3 ns pulse width was used as a trigger signal...
In this paper, designs of Dielectric Lens Loaded Double Ridged Horn Antenna for Millimetre Wave Applications is investigated. Firstly a double ridged horn antenna is designed and simulated in CST environment. After that, 2 dielectric lens architecture are designed and placed at the aperture of the antenna. It is seen that by placing spherical shaped dielectric lens, it is possible to achieve improvement...
In this paper, it is presented that quasi TEM-Horn antenna array to rescue buried victims under rubble. Designed antenna array, which consists of 4 elements, is operated between 400 MHz and 2 GHz. In order to penetrate electromagnetic wave into rubble, lower frequencies like 400–500 MHz should be used, because of attenuation of the concrete. Besides, it is required that ultra-wide band operation for...
Ultra wide band (UWB) antennas are of huge demand and Vivaldi antennas as well as the TEM Horn antennas are good candidates for UWB applications as they both have relatively simple geometry and high gain over a wide bandwidth. The aim of this study was to design such an antenna that achieves the maximum antenna gain over a bandwidth between 1 GHz to 10 GHz while minimizing the size of the antenna...
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