Results 161 to 170 of about 4,061 (210)

Stacked dielectric resonator antenna for multifrequency operation

Microwave and Optical Technology Letters, 1998
A stacked dielectric resonator antenna (DRA), composed of an annular ring excited by a coaxial probe and two cylindrical dielectric resonators (CDRs), is studied experimentally for three‐frequency band operation. A maximum frequency ratio of 1.75 is achieved between higher and lower frequencies, and quite similar radiation patterns are obtained at two ...
Sangiovanni, A., Dauvignac, Jean-Yves, Pichot, Christian   +2 more
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Multifrequency Spaceborne Deployable Radiometer Antenna Designs

IEEE Aerospace and Electronic Systems Magazine, 2020
As part of overall ocean dynamic satellite research, the atmospheric correction microwave radiometer (ACMR) used to correct atmospheric path delay in the radar altimeter has been developed recently. The ACMR, composed of an observing antenna (OA) and calibration antenna, operates at 18.7, 23.8, and 37 GHz for improving atmospheric retrieval accuracy ...
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Multifrequency loop slot antenna with omnidirectional pattern

Electronics and Communications in Japan (Part I: Communications), 2006
AbstractIn this paper, we study multifrequency antennas with planar omnidirectionality for application to mobile base stations. A method for frequency sharing is implemented by connecting the antenna elements resonating at their respective frequencies by microstrip lines so that they become an open terminal at the resonance frequencies of the other ...
Yuji Yokoo, Hiroyuki Arai
openaire   +1 more source

Experimental results of a multifrequency array antenna

IEEE Transactions on Antennas and Propagation, 1972
An array antenna containing three arrays of interlaced radiating elements with operating frequencies in L, S , and C bands are described. Measured results include radiation patterns, crosspolarization data, gain, impedance, and mutual coupling measurements.
J. Boyns, J. Provencher
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U‐patch antenna loaded by complex substrates for multifrequency operation

Microwave and Optical Technology Letters, 2001
AbstractIn this paper, the analysis of patch antennas with U‐shaped metalization loaded by bianisotropic media is developed. A theoretical study is performed to obtain transmission‐line equations for bianisotropic materials, and then a method‐of‐lines (MoL) procedure is applied to obtain the radiative characteristics.
BILOTTI, FILIBERTO, Vegni L, Alu A.
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Researching horn antenna properties in multifrequency measurements

Proceedings, 6th International Conference on Actual Problems of Electronic Instrument Engineering, 2003
The report summarises the results of researching properties of horn antennas included in a multifrequency microwave reflectometer within frequency range 8-26 GHz and gives the estimation of their fitness as a probe. For a microwave reflectometer, the key is fact of using the antenna at the same time for irradiation of tested structure and reception of ...
O.O. Drobakhin, Y.V. Kondratyev
openaire   +1 more source

Multifrequency microstrip patch antenna using multiple stacked elements

IEEE Microwave and Wireless Components Letters, 2003
A multifrequency microstrip patch antenna comprised of a driven patch and a plurality of parasitic elements placed underneath a driven patch is proposed. The antenna features a multifrequency behavior (five operating band) with similar gain.
J. Anguera, G. Font, C. Puente, C. Borja, J. Soler   +4 more
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Multifrequency dipole antenna with closed‐spaced parasitic elements

Electronics and Communications in Japan (Part I: Communications), 1989
AbstractIt is shown theoretically and experimentally that a multifrequency dipole antenna can be realized by placing parasitic elements close to an excited element. Numerical data for two‐frequency and five‐frequency operations are presented. In the theoretical analysis, current distribution along both the excited and parasitic elements are calculated,
Yoshio Ebine, Kenichi Kagoshima
openaire   +1 more source

Multifrequency operation technique for aperture coupled microstrip antennas

Proceedings of IEEE Antennas and Propagation Society International Symposium and URSI National Radio Science Meeting, 2002
A multiple frequency operation technique is proposed for a microstrip antenna, in which the structure is fed by a microstrip line through an aperture coupling. The technique is general and can also be applied to microstrip antennas with other feed types. It allows the antenna to operate at several discrete frequencies over a wide frequency band. >
X.H. Yang, L. Shafai
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Multifrequency characteristics of sinc shaped microstrip patch antenna

Microwave and Optical Technology Letters, 2007
AbstractCharacteristics of a single‐layer, multi‐frequency microstrip patch antenna, which uses a Sinc shaped microstrip patch configuration, are studied. This antenna is capable of providing good impedance matching at all frequencies without tuning the feed position and other design parameters. A parametric study is conducted using commercial software
Nisha Gupta, Mrinal Mishra, Suneel Chandra Kotha, Yalamanchili Kiran   +3 more
openaire   +1 more source