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A dual broadband flexible butterfly loop antenna is designed to be worn on a human body which covers several important bands for wearable applications including the MedRadio band 402–406 MHz and ISM bands (433–434, 902–928 and 2400–2483.5) MHz. This antenna offers two wide bands for the reflection coefficient S11 −10 dB from 430–1003 MHz and 2004–2700 MHz with bandwidths of 573 and 696 MHz respectively...
Many wideband antennas have been developed over the years in order to meet such as UWB and radar applications. In this paper, we first have compared a number of broadband dipole antennas. Based on the knowledge gained, a new broadband dipole antenna on top of a conducting ground plane (a reflector) is then proposed and investigated with the aid of a commercial electromagnetic simulation package. The...
Photoconductive antennas have been widely used to generate and detect THz waves in recent years. Because the thickness of the substrate is usually larger than the wavelength of THz waves, surface/substrate modes may be generated and the effect of the substrate cannot be ignored - this has not been properly investigated. This paper is therefore to investigate this problem using a numerical simulation...
Terahertz (THz) wave has attracted a lot of attention in recent years because of its huge potential applications. The most widely used structure for THz generation and detection is photoconductive dipole antenna which has an omni-directional radiation pattern, so how to generate THz wave efficiently in a desired direction is still a problem to be resolved. This paper introduces a new type of photoconductive...
Theoretical studies are carried out for the electromagnetic characteristics of single-walled carbon nanotube (SWCNT) bundle dipole antennas based on the distributed circuit model of a single SWCNT, where the cross section of bundles is in circular geometries. The current distribution is predicted with effects of cross-sectional size of bundle, nanotube length, and operating frequency all taken into...
This paper presents a balanced wideband dipole antenna fed by coplanar strips for ultra-wideband (UWB) applications. It can cover the frequency band of 3.1-4.8 GHz of the multi-band OFDM UWB with a bandwidth of 3-7 GHz for VSWR < 2 . Parametric studies have been carried out to further investigate the effect of the tuning elements W3 and R on the frequency of operation. Simulated current distributions,...
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