Precision Polarization Measurements of Circular Polarized Global Horn Satellite AntennasAntenna Polarization MeasurementsDirective Gain MeasurementsSpacecraft Global Horn AntennasWaveguide Quarter Wave PolarizersThis paper will describe the measurement series performed on Global Horn flight antennas to be used on ...
A particularly interesting multiple feed antenna is a torus antenna. The reflector has a circular contour in the scan plane and a parabolic contour in the orthogonal plane. The scan plane must be carefully aligned with the orbital arc plane. However, once aligned, that antenna is capable of ...
circular polarizationquadrifilar helical antennas (QHAA circularly polarized quadrifilar helical antenna, operated at 2.4 GHz and intended for applications in satellite mobile communications, is designed using genetic algorithms (GA). The antenna was firstly considered as a test on an infinite ground ...
The size of the layer II circular ring changes similarly. As the size decreases, η increases from 0.8 to 1.0, the resonance frequency point in the low-frequency band is shifted to a lower frequency range, and the reflection amplitude increases. However, this change had little effect on the...
In addition, the circular-polarized antenna in Ka-band has become the focus of attention because of its flexibility in polarization matching for satellite communication [9], [10], [11], [12]. The shared-aperture technology has significant effect on achieving the multi-function antennas, reducing...
Dual Circular PolarizedSteering Antenna for Satellite Communications In X Band. G. Exposito-Dominguez,J. M. Fernandez-Gonzalez,P. Padilla, et al. Progress In ElectromagneticsResearch . 2012Exposito-Dominguez, G., J. M. Fernandez-Gonzalez, P. Padilla de la Torre, and M. Sierra-Castner, "...
TRI-BAND CIRCULARLY-POLARIZED ANTENNA FOR A SATELLITE COMMUNICATIONS GROUND TERMINALA system for and method of receiving and transmitting signals to and from one or more satellites is provided. In particular, the system and method allow for transmitting and receiving signals in, for example, Ka, K...
In this paper, we present a dual-band dual-circular-polarized planar spiral-slot CNSS antenna. This antenna works at L Band (1616??5 MHz, left-handed circular polarization, LHCP) and S Band (2492??5 MHz, right-handed circular polarization, RHCP). Numerical results show that the impedance...
The offset hemi/zone antenna feeds are clusters of square horns with excitation in amplitude and phase producing the required shaped beams. Hemispherical and zone coverages are simultaneously obtained with opposite-sense circular polarizations. Feed characteristics, reflector size, and focal length are ...
In the preferred embodiment, a circular polarized antenna 2 receives the signals transmitted by one or more GPS satellites, which signals are bandpass filtered by a radio frequency bandpass filter 4 tuned to the frequencies of interest and producing the spread spectrum positional signals of interest ...