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In a communication satellite, multiple frequency bands are used for transmitting and receiving communication, data and tracking signals. In this paper we present design, analysis and test results of a dual-aperture coaxial multiband feed horn. The coaxial configuration is particularly useful for the frequency bands that are widely separated. Our design goal was to operate at S-, Ku-, K- and Ka- bands...
Microstrip patch antennas with inset feed have been studied extensively over the past two decades because of its practical advantage when used in mobile wireless systems. The length of MPA, however, is comparable to a half wavelength with single resonant frequency and bandwidth around 2%. In this paper, we describe a novel approach to reduce the antenna size and provide multiband operation. Electromagnetic...
The radiation properties of a circular patch antenna with u-slot designed on glass epoxy FR-4 substrate are obtained and compared with that of a normal circular patch antenna designed under identical conditions. The modified antenna not only resonates at two different frequencies allotted by IEEE 802.16 working group for lower band (2.495-2.695 GHz) operation for WiMax systems but also presents marked...
In this paper, a hybrid antenna that will excite a dual linear polarization radiation via two very different feeding mechanisms that exhibit low cross polarization and high isolation is proposed and studied.
This paper presents some results of a numerical modeling study of a focal plane array (FPA) comprising of 144 Vivaldi antenna elements, and complements the results which were earlier reported in. In the present study, we consider two EM-problems of different complexity, namely, (i) the free-standing FPA with a finite ground plane that was modeled to evaluate the accuracy of the simulated patterns...
A dual-band element that operates in two separate industrial, scientific, and medical (ISM) bands is presented that provides dual-linear or dual-circular polarization in each band. The element is ideal for wireless communication applications utilizing multiple protocol and/or Bluetooth technology. This design is realizable in cost effective printed circuit board technology making it an attractive...
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