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This paper presents novel designs, analyses, and simulations of two miniaturised pyramidal double-ridged horn (PDRH) microwave antennas for medical imaging systems. The PDRH antennas have been optimised to operate within a ceramic material filling with permittivity of 41 (which approximately is the permittivity of the human skin in the intended frequency range), in order to make the compact antennas,...
This paper presents our primary work on a THz beam-scanned imager working at 220 GHz. An offset Dragonian dual-reflector antenna is designed to achieve better beam performance during the scanning of the target area. The simulation results show that electrical field amplitude peak values decrease less than 1 dB in the area of 0.4m∗0.4m. And the proposed beam-scanned imaging method is also simulated...
In this paper, the photoconductivity of silicon is characterized in measurement in two mm-wave bands: 110GHz – 170GHz and 220GHz – 325GHz. It is shown that in the mm-wave bands the silicon has a low loss under dark condition but becomes almost opaque under light illumination.
This paper presents our initial study on a novel reconfigurable MIMO slot antenna to achieve pattern diversity and therefore improve the system performance. The MIMO antenna consists of two identical reconfigurable slot antennas which are separated by a distance of less than quarter wavelength designed at the frequency of 5.2 GHz suitable for WLAN applications. Each of the slots can be reconfigured...
We have presented a numerical investigation of a wideband coaxial-based helical antenna for deep-seated cancer treatment. The proposed antenna with a diameter of 1.79mm and the total length of 20mm, which is thin and small enough for invasive cancer treatment. Numerical simulations indicate that the antenna exhibits an acceptable return loss (5.6dB) over a wide frequency range from 2.82 to 11 GHz...
In this paper, the miniaturization of a printed circular disc monopole antenna is investigated. It is shown that by halving the original antenna and adjusting the coplanar ground plane width, an even wider impedance bandwidth at the lower end can be obtained. Furthermore, a clear physical explanation is provided to illustrate the mechanism of this type of half circular disc antenna.
This paper presents an investigation of cross ring/disc antenna for UWB applications. A coaxial cable fed cross the ring antenna with satisfactory -10 dB return loss bandwidth is firstly designed. In order to minimize the radiation pattern distortion at 9 GHz, an extended ground plane is then introduced. A comparison of performance of four different kinds of cross ring/disc antennas is also illustrated.
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