Results 171 to 180 of about 31,794 (223)
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Small‐meandered coplanar antenna in UHF bands
Microwave and Optical Technology Letters, 2010AbstractA low profile, electrically small coplanar antenna with omnidirectionnal radiation is presented. The antenna is less than λ0/400 in height and λ0/14 in lateral dimension. It is matched to 50 Ω without the need for external matching. The antenna's geometry and concept design using short‐circuiting and line‐meandering techniques are presented in ...
Boucher, Solène, Sharaiha, Ala
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Proceedings 2000 IEEE International Conference on Phased Array Systems and Technology (Cat. No.00TH8510), 2002
This UHF wideband antenna was developed for DARPA's synthetic aperture radar (SAR) applications. The small array could be mounted at the belly of an aircraft. The operating frequency covers a 4:1 bandwidth. The antenna including the feed and a contoured ground plane was designed to fit in a shallow radome (50 cm/spl times/100 cm/spl times/100 cm).
J.J. Lee +3 more
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This UHF wideband antenna was developed for DARPA's synthetic aperture radar (SAR) applications. The small array could be mounted at the belly of an aircraft. The operating frequency covers a 4:1 bandwidth. The antenna including the feed and a contoured ground plane was designed to fit in a shallow radome (50 cm/spl times/100 cm/spl times/100 cm).
J.J. Lee +3 more
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Compact Proton Accelerator in UHF Band At KAHVELab
202231st International Linear Accelerator Conference, LINAC 2022 -- 28 August 2022 through 2 September 2022 ...
Esen, Seyma +13 more
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Factorized Geometrical Autofocus at UHF-band
2019 International Radar Conference (RADAR), 2019This paper describes an autofocus experiment at UHF-band. That is within the scope of factorized geometrical autofocus (FGA). The FGA algorithm is a base-2 fast factorized back-projection (FFBP) formulation with six free geometry parameters (per sub-aperture pair). These are tuned step-by step until a sharp image is obtained.
Jan Torgrimsson +2 more
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A dual-band monopole antenna for UHF-band applications
Microwave and Optical Technology Letters, 2014A dual-band monopole antenna for UHF-band applications has been demonstrated in this work. The dual-band characteristics are achieved using several strip monopole radiators. In addition, a small planar inverted-F monopole antenna is connected to the ground plane.
Chien-Jen Wang, Yun-Lin Lee
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Ultrawide-band noise radar in the VHF/UHF band
IEEE Transactions on Antennas and Propagation, 1999A radar that transmits continuous band-limited random noise is considered. The target impulse response is constructed from the cross correlation of the received signal with the transmitted noise signal. The system uses a fixed-length delay line and relies on the target movement through the range gate.
I.P. Theron +3 more
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Propagation in the UHF-TV band
IRE International Convention Record, 2005The Central Radio Propagation Laboratory of the National Bureau of Standards has been conducting a program of research at frequencies of 418 and 1,046 mc in conjunction with an extensive 100 and 200 mc program of measurements throughout the United States.
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Ionospheric Phase Distortion at UHF Band
IETE Journal of Research, 1971In the present communication the author has presented the calculated results of net relative phase dispersion, which is made up of the phase path delay and group path delay, in the wide band (100 MHz) communication at UHF band (790–890 MHz), suffered by the radio waves while propagating through the ionosphere.
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Balun transformer in VHF and UHF band
APMC 2001. 2001 Asia-Pacific Microwave Conference (Cat. No.01TH8577), 2002Two kind of balun transformers are composed of a balun transition and an impedance matching circuit. Both of them have good performance and compact size. Chemical etching compatible with the common microwave circuit manufacturing process is employed to make them.
null Dow-Chih Niu +3 more
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A Wide Stop Band UHF Coaxial Band-Pass Filter (Correspondence)
IEEE Transactions on Microwave Theory and Techniques, 1963A narrow-band coaxial filter is described which has a stop band fourteen times the fundamental frequency, and is relatively simple to design. Since the well-known multiresonator coaxial band-pass filter having quarter-wavelength resonators is probably the most commonly used coaxial filter for narrow-band frequency selection, the design to be described ...
J.F. Lally, R.R. Ciehoski
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