Results 231 to 240 of about 839,323 (288)
Some of the next articles are maybe not open access.
Proceedings of MILCOM '95, 2002
Multiband operation of planar and phased array antennas is becoming increasingly important in both military and commercial communications due to the need for flexibility in meeting a number of operational SATCOM requirements. With today's technology, multiband operation requires changing antenna feed components and so hinders rapid changeover to ...
G.H. Aicklen, L.S. Tamil
openaire +1 more source
Multiband operation of planar and phased array antennas is becoming increasingly important in both military and commercial communications due to the need for flexibility in meeting a number of operational SATCOM requirements. With today's technology, multiband operation requires changing antenna feed components and so hinders rapid changeover to ...
G.H. Aicklen, L.S. Tamil
openaire +1 more source
Thinning planar array antennas with ring arrays
Proceedings of the IEEE, 1963A study has been made of thinning planar arrays by removing a large fraction of the elements, but keeping the main lobe width relatively unchanged and maintaining reasonably good sidelobe levels. The amplitude of the signal at each element is assumed constant (no amplitude taper). Peak sidelobes of the order of -25 db are obtained with a 10,000 element
J. Sherman, M. Skolnik
openaire +1 more source
Ultrawideband planar antennas and antenna arrays
2012 6th International Conference on Ultrawideband and Ultrashort Impulse Signals, 2012The paper presents analysis of signals and planar monopole pulse antennas and antenna arrays designed for work in ultrawideband (UWB) frequency band 3.1–10.6GHz. A complex approach to design, synthesis and optimization of UWB antennas is proposed. Frequency and time characteristics of UWB signals, designed single and two-element antennas, results of ...
openaire +1 more source
IETE Journal of Research, 1981
Planar antennas employing printed circuit techniques are ideally suited for aircraft, spacecraft and mobile-land applications. Keeping these in view, a 12×4-element planar array antenna has been developed. The antenna has a power gain of 19 dB. It has a half power beamwidth of 6° in the H-plane and 20° in the E-plane.
openaire +1 more source
Planar antennas employing printed circuit techniques are ideally suited for aircraft, spacecraft and mobile-land applications. Keeping these in view, a 12×4-element planar array antenna has been developed. The antenna has a power gain of 19 dB. It has a half power beamwidth of 6° in the H-plane and 20° in the E-plane.
openaire +1 more source
Light Focusing by Planar Array of Antennas
Frontiers in Optics 2011/Laser Science XXVII, 2011Utilizing concentric loops as the scatterers of a transmitarray, subwavelength light localization in a desired distance is achieved. The flexibility of the elements makes it a convenient structure to engineer a high performance system.
Babak Memarzadeh, Hossein Mosallaei
openaire +1 more source
A planar tri-band array antenna
The 8th European Conference on Antennas and Propagation (EuCAP 2014), 2014A planar tri-band array antenna design is presented. The antenna has three equally tuned resonant bands and also maintains consistent radiation patterns in all the operational subbands. The antenna architecture is simple and measures only 0.33λ × 0.33λ (unit cell), at the lowest frequency of operation, making it suitable for array applications.
S. E. Valavan, D. Tran, A. G. Yarovoy
openaire +1 more source
Design and development of planar antenna array for mimo application
Wireless Networks, 2020Multi-Input Multi-Output (MIMO) is the need for recent communication system for the enhancement of channel capacity. While the number of antenna array elements increased, the spacing between the array elements and size of the antenna reduced. Hence high coupling between the elements occur, and thus the channel capacity reduced.
T. Prabhu, S. Chenthur Pandian
openaire +1 more source
Evaluation of directivity for planar antenna arrays
IEEE Antennas and Propagation Magazine, 2000In this paper, the directivity, including phase shift factors, for several types of uniformly excited planar arrays is obtained. Four types of dipole arrays are considered: arrays of collinear short dipoles, and of parallel short dipoles; and broadside and end-fire arrays of crosses of short dipoles.
null Min Joon Lee +3 more
openaire +1 more source
Development of a large planar array antenna
Proceedings of IEEE. AFRICON '96, 2002This paper describes a planar array antenna developed for use with a 3D (i.e. height detection) long range mobile search radar. The radiating aperture consists of 576 individual L-band dipole radiators, grouped together in 18 identical horizontal linear arrays, which are spaced vertically. The antenna contains distributed transmit (TX) and receive (RX)
A.E. Graham +2 more
openaire +1 more source
Foldable multifunctional planar antenna array
2012 Asia Pacific Microwave Conference Proceedings, 2012In this paper, a novel foldable multifunctional planar antenna array is proposed. It provides two modes; diversity and directivity modes. Each mode is switched by folding and unfolding the proposed antenna array. For the diversity mode, four antenna elements are placed for MIMO applications.
Hyeonhyeong Choe, Sungjoon Lim
openaire +1 more source