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The design and fabrication of aperture coupled stacked microstrip patch antennas for TT&C uplink and downlink system in satellite is described in this paper. Two antennas are designed here of which one operates at an uplink frequency of 6.4GHz and the other antenna operating at a downlink frequency of 4.2 GHz. Stacking configuration is implemented in this design to enhance the gain the gain of...
Recently, the role of a BLDC (Brushless Direct Current) motor is favoring the designers due to its higher efficiency. Most of the applications are already using BLDC motors as a replacement for AC motors and this holds true for innumerous applications, and these motors also reduce the overall system weight. The commutation of BLDC motor is done electronically; hence it is quite simple to control the...
This paper presents a detailed study for realization of an optimized configuration of a 4.6 m diameter reflector antenna for ship-borne transportable terminal using axially displaced ellipsoid (ADE) configuration. Maximum gain achievable from the aperture coupled with system level parameters like G/T, accommodation of a feed capable of simultaneous uplink and downlink involving monopulse tracking...
In this paper, the design and the measured results of a compact active spherical phased array antenna (SPAA) are presented. Analysis is carried out including the effect of amplitude imbalances in the excitation in predicting the exact performance of the SPAA. The measured results are compared with the simulated results. Measured effective isotropic radiated power (EIRP) shows close match with the...
Ultra wide Band (UWB) technology is one of the most promising solutions for future communication systems due to its high-speed data rate and excellent immunity to multi-path interference. The frequency range for UWB systems approved by the FCC is between 3.1 and 10.6 GHz. The printed antenna is designed to cover the UWB in particular, the lower band of 3.1–5 GHz. It is a well known concept that the...
In this paper, design of a circularly polarized (CP) Quadrifilar Helix antenna (QFH) is discussed. QFH provides a circularly polarized cardioid-shaped radiation pattern with a high front-to-back ratio, better circular symmetry in the pattern and very good cross-polarization discrimination over wide coverage. Realization aspects and the measured results of the QFH are discussed here. This antenna is...
In this paper, design of a dual circularly polarized (CP) spherical phased array antenna (PAA) is discussed. Dual CP configuration is implemented to enable frequency reuse using polarization diversity. This is realized using a high performance dual CP radiating element. This antenna is capable to generate beams in both the polarizations at any specified direction over the hemisphere. Realization aspects...
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