Spectroscopy at radio and microwave frequencies
نویسندگان
چکیده
منابع مشابه
Periodic and Guiding Structures at Microwave Frequencies
The paper reviews the properties of periodic and guiding structures which now play an important part in the operation of components, antennas, electron tubes and low-noise amplifiers. An account is first given of dispersive propagation in periodic-loaded lines, showing how the frequency characteristic breaks into pass and stop bands. The formation of forwardand backward-space harmonics and the ...
متن کاملHigh-Impedance Electromagnetic Surfaces with Forbidden Bands at Radio and Microwave Frequencies
A new type of metallic electromagnetic structure has been developed that is characterized by having high surface impedance. The geometry is analogous to a corrugated metal surface in which the corrugations have been folded up into lumped circuit elements, and distributed in a 2-D lattice. Although it is made of continuous metal, and conducts DC currents, it does not conduct AC currents within a...
متن کاملDielectric Properties of Materials at Microwave Frequencies
KŘIVÁNEK, I.: Dielectric properties of materials at microwave frequencies. Acta univ. agric. et silvic. Mendel. Brun., 2008, LVI, No. 5, pp. 125–132 The paper introduces the review of the present state of art in the measurement of the interaction of electromagnetic waves with diff erent kinds of materials. It is analysis of the possibilities of the measurement of the interaction of high frequen...
متن کاملGrating-coupled surface plasmons at microwave frequencies
This work presents a detailed investigation of electromagnetic coupling to the surface plasmon-polariton ~SPP! at microwave frequencies. We have recorded the wavelength-dependent reflectivity from a metallic sinusoidal diffraction grating of pitch 15 mm. In order to minimize the problems associated with nonplanar incident wavefronts, we have developed an apparatus that collimates the incident b...
متن کاملMetamaterial electromagnetic cloak at microwave frequencies.
A recently published theory has suggested that a cloak of invisibility is in principle possible, at least over a narrow frequency band. We describe here the first practical realization of such a cloak; in our demonstration, a copper cylinder was "hidden" inside a cloak constructed according to the previous theoretical prescription. The cloak was constructed with the use of artificially structur...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Chemical Education
سال: 1956
ISSN: 0021-9584,1938-1328
DOI: 10.1021/ed033pa344.1