Portable low profile antenna at X-band

An antenna which has been conceived as a portable system for satellite communications based on the recommendations ITU-R S.580-6 and ITU-R S.465-5 for small antennas, i.e., with a diameter lower than 50 wavelengths, is introduced. It is a planar and a compact structure with a size of 40×40×2 cm. The antenna is formed by an array of 256 printed elements covering a large bandwidth (14.7%) at X-Band with a VSWR of 1.4:1. The specification includes transmission (Tx) and reception (Rx) bands simultaneously. The printed antenna has a radiation pattern with a 3dB beamwidth of 5°, over a 31dBi gain, and a dual and an interchangeable circular polarization

Mutual Coupling Reduction Techniques in Electronic Steering Antennas in X Band

This work provides the development of an antenna for satellite communications onboard systems based on the recommendations ITU-R S.580-6 [1] and ITU-R S.465-5 [2]. The antenna consists of printed elements grouped in an array, working in a frequency band from 7.25 up to 8.4 GHz (15% of bandwidth). In this working band, transmission and reception are included simultaneously. The antenna reaches a gain about 31 dBi, has a radiation pattern with a beam width smaller than 10oand dual circular polarization. It has the capability to steer in elevation through a Butler matrix to 4

Low losses power distribution network at X band in stripline

An asymmetric stripline is proposed in this paper. The main aim of this line is to distribute the power among subarrays in an array with minimum losses. Several vertical transitions to subarrays are shown besides some network designs at X band for a square array for satellite communications

Modular Planar Antenna at X-band for satellite communications

An antenna which has been conceived as a portable system for satellite communications based on the recommendations ITU-R S.580-6 [1] and ITU-R S.465-5 [2] for small antennas, i.e., with a diameter lower than 50 wavelengths, is introduced. It is a planar and a compact structure with a size of 40×40×2 cm. The antenna is formed by an array of 256 printed elements covering a large bandwidth (14.7%) at X-Band. The specification includes transmission (Tx) and reception (Rx) bands simultaneously. The printed antenna has a radiation pattern with a 3dB beamwidth of 5°, over a 31dBi gain, and a dual and an interchangeable circular polarizatio

Caracterización de una lente zurda plana para la excitación de antenas planas de ranuras

“Metamaterials” are artificially engineered structured materials exhibiting novel properties due to their special architecture and not because of the constituent homogeneous materials used to manufacture them. This enables to design new materials with characteristics not available in conventional materials, as a negative refractive index. A new form of excitation for parallel plate slot antennas based in a planar “left handed” lens is proposed in [1]. This excitation allows enhancing the efficiency of these kinds of antennas. The lens is constructed using the well known “mushroom” structure. Here the characterization of the left handed lens with the mushroom structure in terms of their geometrical parameters (lattice constant, diameter of via, height of substrate) is presented using the dispersion diagram of the unit cell. Some simulations results are shown

Printed antenna for satellite communications

2010 Proceedings of the Fourth European Conference on Antennas and Propagation (EuCAP

Study of materials and manufacturing technologies for an antenna distribution network in Ka band

A study for selecting the technology and material manufacturing for the distribution network of a low profile antenna in Ka band in order to provide Internet connection in commercial aircrafts through satellite link. It is presented the general structure of the network focused in new printed technologies for high frequencies such as Substrate Integrated Waveguide or Ridge Gap Waveguide. Simulated results for different dielectric materials in terms of transmission losses are provided

Design proposal for ridge waveguide and comparison with other technologies in Ka to W bands

A design procedure of Ridge Gap Waveguide technology is proposed. The simulated results for Ka-band and above are compared with other technologies like Substrate Integrated Waveguide, microstrip or classical waveguide in terms of transmission losses

EBG structures as PMC sidewalls in parallel plate slot antennas

Electromagnetic BandGap (EBG) structures have unique properties in controlling the propagation of electromagnetic waves, which enable them to be implemented in a number of applications. In this work we analyse the effect of EBG sidewalls, first in a parallel plate waveguide and as practical application in parallel plate slot antennas. These structures present some interesting properties that may overcome some of the problems of conventional technologies. Recently, several EBG struc tures have been proposed and demonstrated to be useful in enhancing performances of microwave circuits or antennas. We use these novel structures to realize a perfect magnetic conductor (PMC) surface artificially. The results of the effect using PMC in comparison with perfect electric conductor (PEC) in the sidewalls of the parallel plate slot antennas is presented as examples of application. Using PMC sidewalls in this kind of antennas, relatively uniform field distributions are improved, so it allows to increase the directivity to enhance the efficiency of these antennas

Analysis of the effect of EBG sidewalls in paralllel plate slot antennas

In this work we analyse the effect of EBG sidewalls in parallel plate slot antennas. Electromagnetic BandGap (EBG) structures present some interesting prope rties that may overcome some of the problems of conventional technologies. Recently, several EBG structures have been proposed and demonstrated to be useful in enhancing performances of microwave circuits or antennas. We use these novel structures to realize a perfect magnetic conductor (PMC) surface artificially. The results of the effect using PMC in comparison with perfect electric conductor (PEC) in the sidewalls of the parallel plate slot antennas is presented as examples of application. Using PMC sidewalls in this kind of antennas, relatively uniform field distributions are improved, so it allows to increase the directivity getting to enhance the efficiency of these antennas