Results 241 to 250 of about 85,977 (300)

Microwave Radiation Hazards around Large Microwave Antenna

American Industrial Hygiene Association Journal, 1973
The microwave radiation hazards associated with the use of large antennas become increasingly more dangerous to personnel as the transmitters go to ever higher powers. The near field area is of the greatest concern,, It has spill over from sub-reflector and reflections from nearby objects. Centimeter waves meeting in phase will reenforce each other and
openaire   +2 more sources

Microwave Antenna Technology

16th European Microwave Conference, 1986, 1986
Recent microwave antenna technologies which are developed in Japan are reviewed. Main antennas which are practically used in various fields are described. The trends of antenna research works are also shown.
openaire   +1 more source

A microwave antenna lead

Instruments and Experimental Techniques, 2013
A microwave antenna lead for feeding signals to high-voltage electrodes is described. The unit includes the receiving and transmitting microwave antennas, separated by a high-voltage insulator. The antennas are made as two symmetrical parts of a cut-across half-wavelength coaxial closely coupled resonator, and the insulator is made as a ceramic disk ...
A. M. Barnyakov, V. I. Ivannikov, A. E. Levichev, V. M. Pavlov, Yu. D. Chernousov, I. V. Shebolaev   +5 more
openaire   +1 more source

Microwave ferroelectric antenna arrays

Proceedings of the 2001 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference. (Cat. No.01TH8568), 2002
In this paper, theoretical investigation of ferroelectric antenna arrays without phase shifters and attenuators has been presented. This concept is based on utilizing a voltage-controlled ferroelectric array, where the variable pattern of each antenna element is used to shape the array pattern.
J. Modelski, Y. Yashchyshyn
openaire   +1 more source

Deployable microwave lens antennas

Proceedings, IEEE Aerospace Conference, 2003
Because of their large mass, waveguide lens antennas have not been widely used in space, in spite of their established superiority to reflector antennas for many aerospace applications. This paper introduces the concept of fabrication of lightweight waveguide lenses using thin, metallized polymer sheets.
M. Hamidi, J. Withington, E. Wiswell
openaire   +1 more source

Microwave Omnidirectional Antennas

Proceedings of the IRE, 1947
This paper describes briefly a number of radiating elements which have proved useful in the design of high- and low-gain omnidirectional antennas at wavelengths of 3 and 10 centimeters.
openaire   +1 more source

Microwave Antennas and Dielectric Surfaces

Journal of Applied Physics, 1949
For a plane dielectric sheet near a receiving antenna the power varies sinusoidally with distance, having a half-wave period and an average proportional to the transmission coefficient. This is explained by assuming an equivalent antenna reflection, an assumption checked by special experiments.
openaire   +2 more sources

Microwave Antenna Analysis

Proceedings of the IRE, 1947
The diffraction theory of Stratton and Chu is applied to a calculation of the vertical polar diagram and the gain of a parabolic cylindrical antenna. This antenna is fed by a line source having a known energy distribution and polarization. A numerical calculation for a particular profile is carried out, and the results are compared with those obtained ...
openaire   +1 more source

Sonic microwave-antenna simulator

IEEE Transactions on Antennas and Propagation, 1986
A simulator is described which generates and transmits beams of audible sound energy which are mathematically similar to those generated in a microwave system. The simulator's transmitting elements form a phased array that electronically focuses and steers coherent sonic beams allowing microwave antenna pattern generation to be studied acoustically in ...
J. Ott, J. Rice
openaire   +1 more source

Intraoperative Triple Antenna Hepatic Microwave Ablation

American Journal of Roentgenology, 2006
Microwave ablation is emerging as a new treatment option for patients with unresectable hepatic malignancies. This two-center study shows the results of a phase 1 clinical trial of patients with known hepatic masses who underwent synchronous triple antenna microwave ablation before elective hepatic resection.Intraoperative microwave ablation was ...
Caroline J, Simon, Damian E, Dupuy, David A, Iannitti, David S K, Lu, Nam C, Yu, Bassam I, Aswad, Ronald W, Busuttil, Charles, Lassman   +7 more
openaire   +2 more sources