Zobrazeno 1 - 10
of 183
pro vyhledávání: '"B. Schiek"'
Publikováno v:
Advances in Radio Science, Vol 6, Pp 9-17 (2008)
This contribution deals with guided radar level measurements of liquid materials in large metal tubes, so-called stilling wells, bypass or still pipes. In the RF domain these tubes function as overmoded circular waveguides and mode-matched excitation
Externí odkaz:
https://doaj.org/article/d2467dce043543bbb79ed2f3bbc6d12b
Publikováno v:
Advances in Radio Science, Vol 6, Pp 1-4 (2008)
Microwave techniques for the measurement of the permittivity of soils including the water content of soils and other materials, especially TDR (time domain reflectometry), have become accepted as routine measurement techniques. This summary deals wit
Externí odkaz:
https://doaj.org/article/25320874a0264e67a4464008d9926f57
Publikováno v:
Advances in Radio Science, Vol 6, Pp 27-30 (2008)
With the availability of multi-port vector network analyzers, the need for automated, calibrated measurement facilities increases. In this contribution, a calibration-measurement unit is presented which realizes a repeatable automated calibration of
Externí odkaz:
https://doaj.org/article/49118bca0e1943f197aae6a948a1aa46
Publikováno v:
Advances in Radio Science, Vol 5, Pp 13-17 (2007)
The measurement of the scattering matrices of n-port networks is an important task. For this purpose two ports of the n-port network are connected with the network analyzer and the remaining ports are connected to reflecting terminations. In order to
Externí odkaz:
https://doaj.org/article/d626b256d6ee4c489573312be366490f
Publikováno v:
Advances in Radio Science, Vol 5, Pp 439-445 (2007)
In this article, the error-corrected determination of complex scattering parameters of multi-port devices by means of a 2-port vector network analyzer is presented. As only two ports of the device under test can be connected to the analyzer ports at
Externí odkaz:
https://doaj.org/article/e4b470fa870747e4a4f6f025a831d2fc
Publikováno v:
Advances in Radio Science, Vol 3, Pp 59-64 (2005)
The multi-port method for the measurement of the scattering parameters of multi-ports with the help of a vector network analyzer (VNA) with only two measurement ports is presented. For the measurements only two ports of the N-port device can be conne
Externí odkaz:
https://doaj.org/article/97e86f316a93489c8d781b43ac7aeb8f
Autor:
M. Gerding, B. Schiek
Publikováno v:
Advances in Radio Science, Vol 3, Pp 69-73 (2005)
This paper deals with the basic electrical properties of dual networks and with their application in broadband matched filter structures. Starting with the main characteristics and different realization methods of dual networks, a filter structure is
Externí odkaz:
https://doaj.org/article/456074283564420c95c868dc198fa1af
Publikováno v:
Advances in Radio Science, Vol 3, Pp 65-68 (2005)
A fast four channel network analyzer is introduced to measure S-parameters in a frequency range from 10MHz to 3GHz. The signal generation for this kind of analyzer is based on pulse generators, which are realized with bipolar transistors. The output
Externí odkaz:
https://doaj.org/article/4869efaf73d349fdac66c531bb0c94d9
Publikováno v:
Advances in Radio Science, Vol 3, Pp 75-81 (2005)
Concepts for the generation and the measurement of highly linear frequency ramps are presented. The fractional ramp synthesiser concept shown here is able to generate frequency ramps with a very low phase noise level, a very good frequency linearity
Externí odkaz:
https://doaj.org/article/c2f267369cc14eb092ec2856aa1e5340
Publikováno v:
Advances in Radio Science, Vol 2, Pp 19-25 (2004)
In this article calibration methods for the precise, contact-less measurement of the permittivity, permeability or humidity of materials are presented. The free space measurement system principally consists of a pair of focusing horn-lens antennas co
Externí odkaz:
https://doaj.org/article/4eb5fb1822004cdf81a70eba99bd1736