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This paper demonstrates a design of dual-polarized Vivaldi array to feed high-gain broadband Luneburg lens. The proposed conformal Vivaldi array, placed around the lens surface, is composed of 8 × 4 horizontal polarized elements and 7 × 3 vertical polarized elements. The performance of the entire 3-D graded index Luneburg lens antenna (30 cm diameter) has been evaluated based on simulated radiation...
This paper presents a design of an electrically-small helical antenna for long distance communications at HF-band (i.e., 3–30 MHz). Two different matching circuits (i.e., a passive reconfigurable LC network and an active non-Foster circuit) are designed, fabricated and tested to achieve wideband coverage of the designated HF-band. Field-test measurements were carried out to investigate the performance...
A novel metamaterial-FSS (frequency selective surface) is designed in this paper based on the theory of tightly coupled resonators for radome applications. The proposed metamaterial unit cell consists of a Swastika-shaped conductor on each side of the substrate which is shorted at the edges by introducing shorting strips. The structure exhibits negative permittivity and permeability behavior at distinct...
This paper presents the design and analysis of a novel filter configuration offering infinite attenuation at finite frequencies. The proposed filter has a cut-off frequency of 2 GHz with passband ripple of 0.1dB and a minimum stopband insertion loss greater than 40dB at 3.05GHz. The two infinite attenuation poles occur at 2.4GHz and 2.76GHz. In order to further enhance the filter performance, the...
This paper presents a novel Swastika-shaped metamaterial structure which exhibits metamaterial behavior (μ- and ε-negative) in distinct frequency ranges. The EM analysis of metamaterial (MTM) structure is carried out using transmission line transfer matrix method and validated with full-wave method based software package. The proposed structure is observed to exhibit bandpass frequency selective characteristics...
Double layered printed antenna possessing air gap coupling is showcased in this paper with enhanced bandwidth for Wi-MAX and WLAN implementation. The patch antenna is popularly accepted because of its economical cost, portability, planar and compact structure and feeding process. The graphical representation of reflection coefficient with frequency lies below −10dB from 4.05 GHz to 5.47 GHz with impedance...
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