This contribution describes the design of a multibeam parabolic reflectarray to produce two adjacent beams per feed in orthogonal circular polarization (CP) simultaneously at transmission (Tx) and reception (Rx) frequencies Ka-band. The variable rotation technique (VRT) has been applied cells based on types resonant elements, which makes it possible provide Tx Rx, as well implement an in-band o...

This paper presents two designs of high-efficiency polarizer reflectarray antennas able to generate a collimated beam in dual-circular polarization using linearly polarized feed, with application high-gain for data transmission links from Cubesat. First, an 18 cm × operating the 17.2–22.7 GHz band has been designed, fabricated, and tested. The measurements prototype show aperture efficiency 52....

A multi-polarization series-fed antenna working at 10 GHz is presented in this paper. The patch elements are built by eccentric rings which can realize the performance of circular polarization. dual-port feeding allows us to switch polarization antenna. right-hand (RHCP), left-hand (LHCP), and Linear (LP) be realized properly form. changing without controlling. Owing array arrangement, form a c...

This work presents a compact (125 mm diameter) wideband 4-element antenna array with high isolation level for global navigation satellite system (GNSS) applications. The consists of four right hand circularly polarized (RHCP) single feed rectangular patch antennas that can cover BeiDou B1 band (1561.098 MHz), GPS L1 (1575.42 Galileo E1 MHz) and GLONASS G1 (1602 the GNSS upper L-band (1559 -1610...

A circularly-polarized-reconfigurable patch antenna based on fluidic control method is proposed in this paper. liquid dielectric, ethyl acetate, introduced to change the substrate of a from homogeneous inhomogeneous. Two orthogonal fundamental transverse magnetic (TM) modes are excited with 90° phase difference order produce circularly polarized (CP) radiation. Then, polarization switchable bet...

In this communication, we present a theoretical analysis, design, and fabrication of limited-diffractive planar Bessel beam launcher, that exhibits zeroth-order profile in the transverse electric field component with respect to z-propagation axis. The launcher is designed by synthesizing finite zeroth-order, first kind Hankel aperture distribution, polarized along fixed polarization unit vector...

This article presents a novel dielectric resonator antenna (DRA) with an eight-port feeding system offering gain and polarization diversity. The single-antenna unit is defined by square arrangement of four aperture coupled slots (ACSs), hybridized the radiation resonator. Basically, atypical layout, realized two microstrip transmission lines driving each ACSs (thus requiring total eight feed li...

A reflected GPS signal is normally considered as noise (multipath). However, we believe that a reflected signal contains information about the reflecting object. Though, this information may not be useful for accurate position computation, it may help us to identify the reflecting object itself, which is a type of remote sensing. Besides, by measuring the time delay of the reflected signal, it ...

Active antennas (AAs) are a class of radiation system that integrates an antenna and backing active circuits which results in considerable reduction in complexity of the matching networks and filters [1]. This is done by carefully designing the radiating element to provide proper load for active elements. Hummer and Chang have investigated active antenna elements using a microstrip patch antenn...

We study the stability of orientationally disordered crystal phases in a suspension of colloidal hard dumbbells using Monte Carlo simulations. For dumbbell bond length L/σ < 0.4 with L the separation of the two spheres of the dumbbell and σ the diameter of the spheres, we determine the difference in Helmholtz free energy of a plastic crystal with a hexagonal-close-packed (hcp) and a face-center...