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In this paper, linearly and circularly polarized reflectarray antennas with 4-arm Archimedean spiral lattice (LP-RAASL and CP-RAASL) have been designed and simulated. A perforated unit-cell element for the reflectarray is developed to cover about 360o phase variation range. The designed element has same phase response for vertical, horizontal and circular polarizations depending on the polarization...
In this paper, circularly polarized rectifying reflectarray antenna has been proposed. Cylindrical dielectric resonator (CDRA) antenna is used to exhibit left-hand and right-hand circular polarizations. As well, the antenna operates in a linear polarization mode on the basis of the bias states of two PIN diodes. The antenna is used to feed the reflectarray to increase its gain in a certain direction...
This paper investigates the radiation characteristics of on-chip microstrip patch reflectarray for 60 GHz system. The proposed reflectarray is fed using on-chip cylindrical dielectric resonator antenna, CDRA placed at a distance 42.5 mm from the array aperture. The antenna introduces good impedance matching at 61 GHz. The impedance bandwidth is 1.35 GHz. The reflectarray consists of 289 unit-cell...
This paper demonstrates the comparison between two on-chip antennas, circular microstrip patch antenna (CMPA), and cylindrical dielectric resonator antenna (CDRA), planned for operation at 60 GHz and integrated into 0.18-µm CMOS integrated circuits. The antennas are fed with similar feeding networks. The bandwidth for a return loss below −10 dB is 17.9 % for CMPA and 21 % for CDRA. The simulated radiation...
In this paper, rhombic nanoantenna for infrared (IR) detection in frequency band from 10 to 60 THz is proposed. The nanoantenna consists of square aperture etched within a gold metal plate with rhombic patch placed inside the aperture. A parametric study on the nanoantenna dimensions has been carried out for maximum electric field at ƒ= 28 THz. Different types of metals are used for nanoantenna as...
In this paper, low profile perforated folded transmitarray for polarization diversity is proposed for modern communications systems. A high-gain 17 × 17 unit-cell elements folded transmitarray antenna is designed using perforated dielectric substrate at 2.45 GHz. The waveguide simulator is used to calculate the required compensation phase shift for the transmitarray design through the variation of...
This paper introduces different designs of graphene based geometrical diodes coupled with nanoantennas for infrared (IR) energy harvesting. The geometrical diode is an electronic device in which the current flow through it is controlled by its geometry. The I–V characteristics of the graphene based geometrical diodes are calculated by the Monte Carlo simulation. Different shapes of graphene geometrical...
A multi-objective plasmareflectarray/transmitarray antenna which reflects/transmits the incident fields radiating from a feed antenna in different directions have been introduced using a single structure. An electronic beam steering is achived using a DC applied voltage on the array elements. A 13×13 unit-cell reflectarray/transmittarray antenna covering an area 13.52×13.52 cm2 is proposed. The dimensions...
A dielectric resonator antenna reflectarray and transmitarray integrated with solar cell for small satellite and clean energy is proposed. The combination between the antenna and the solar cell serve as a cover protection for the solar cell from the environment. Three array configurations have been presented. In the first one, the reflectarray unit-cell consists of a transparent hemispherical DRA...
In this paper, two transmitarrays are designed, analyzed, and simulated for satellite applications. The first transmitarray is designed for dual linear polarization at a center frequency of 12 GHz. The second transmitarray is designed for two frequency bands: 17.15 GHz to 17.9 GHz for vertical polarization and 11.5 GHz to 12.4 GHz for horizontal polarization. The dual polarization is obtained by an...
The paper presents the radiation characterization of 2×2 sub-array DRA antennas combined with the transmitarray to form directive beam system. Using the transmitarray increases the size of the radiating aperture and enhances the directivity of the 2×2 sub-array DRA antenna. The advantages of using the transmitarray is observed to be 6 dBi extra gain. The antenna array design is optimized by full-wave...
A neural network architecture is applied to the problem of direction of arrival (DOA) and state of polarization estimation using a uniform circular cross and tri-crossed-dipoles antenna array. A three layer radial basis function network (RBFN) is trained with input output pairs. The network is then capable of estimating DOA not included in the training set through generalization and the corresponding...
Numerical solution of complex electromagnetic problems using hybrid techniques is presented in this paper. By combining the desirable features of the method of moments (MoM) and wavelet packet transform (WPT) to analyze large-scale electromagnetic problems. The computational domain is divided into smaller and manageable sub-domains, with coupling between these sub-domains is taken into account. As...
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