Zobrazeno 1 - 10
of 73
pro vyhledávání: '"D.P. Andrews"'
Autor:
C.S. Aitchison, D.P. Andrews
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 48:2424-2431
A design procedure for wide-band quadrature 3-dB couplers at microwave frequencies is presented in this paper, wherein lumped elements are incorporated into a microstrip circuit. Design examples for an octave-band coupler and a one-and-one-half octav
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c2894f0699ae13903d3338ee1fd28b36
https://doi.org/10.1109/22.898993
https://doi.org/10.1109/22.898993
Publikováno v:
Chemical Physics Letters. 293:343-351
The charge separation and recombination rate constants for electron transfer between the first excited singlet state of methylene blue and either aniline or N,N-dimethylaniline have been measured over a range of temperature so that the solvent's long
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a99a68ca1381bc4b854b68399546dc38
https://doi.org/10.1016/s0009-2614(98)00793-3
https://doi.org/10.1016/s0009-2614(98)00793-3
Autor:
C.S. Aitchison, D.P. Andrews
Publikováno v:
2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017).
The design of microwave octave-band lumped element quadrature couplers is presented, including a 1-2 GHz microstrip implementation example. The design offers a more convenient and cost effective solution to tight coupling problems currently solved us
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1c9e2819e88620ddaaa051bb82d3ac95
https://doi.org/10.1109/mwsym.2000.861758
https://doi.org/10.1109/mwsym.2000.861758
Autor:
C.S. Aitchison, D.P. Andrews
Publikováno v:
IEE Proceedings - Microwaves, Antennas and Propagation. 148:275
Methods to implement lumped element quadrature hybrids using a cascade of simpler hybrids are described. Both first and second order cascades are considered in detail, the former requiring an ideal inverting transformer to give an optimum equi-ripple
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bf9db76752fde686192e91431809e895
https://doi.org/10.1049/ip-map:20010703
https://doi.org/10.1049/ip-map:20010703
Autor:
D.P. Andrews, C.S. Aitchison
Publikováno v:
IEE Proceedings - Microwaves, Antennas and Propagation. 148:269
The synthesis of a class of lumped element quadrature hybrids is described. The circuits are applicable to RF systems, and have wide operating band potential. The circuits possess symmetry in both horizontal and vertical planes. Two examples have bee
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::17bdc2e9f046115bc47b09e3e7ac4259
https://doi.org/10.1049/ip-map:20010670
https://doi.org/10.1049/ip-map:20010670
Autor:
D.P. Andrews, C.S. Aitchison
Publikováno v:
IEE Proceedings - Circuits, Devices and Systems. 148:135
Analytic solutions to the transfer functions required for lumped element quadrature hybrids are derived. These transfer functions are necessary for the synthesis of circuits with optimum Chebychev responses to the through and coupled ports. It is fou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2533a61d3cf5a9fb91164cea19b07f09
https://doi.org/10.1049/ip-cds:20010346
https://doi.org/10.1049/ip-cds:20010346
Autor:
D.P. Andrews, C.S. Aitchison
Publikováno v:
IEE Proceedings - Circuits, Devices and Systems. 148:5
The theory of a class of rational Chebychev functions is presented, forming the basis of optimum approximation functions that determine the response of lumped element quadrature hybrids of suitable design. Analytical solutions are presented, allowing
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9b80d0900f855df44f53722666e28bf1
https://doi.org/10.1049/ip-cds:20010126
https://doi.org/10.1049/ip-cds:20010126
Autor:
C.S. Aitchison, D.P. Andrews
Publikováno v:
IEE Proceedings - Microwaves, Antennas and Propagation. 147:267
The design of a 3 dB lumped-element quadrature coupler suitable for a microstrip environment is described in the paper. The circuit exhibits ideal quadrature, return loss and isolation performance, with a coupling characteristic making it suitable fo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2161447bd0d37d4d424904c9d0cf758b
https://doi.org/10.1049/ip-map:20000569
https://doi.org/10.1049/ip-map:20000569
Publikováno v:
Journal of Petroleum Technology. 29:873-885
Carbonate reservoirs are characterized by extreme heterogeneity of porosity, and permeability. This is related to the complexities of the porosity, and permeability. This is related to the complexities of the original depositional environment and the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8f4f0e4874e9bf8b45ee1fb1882b1320
https://doi.org/10.2118/6139-pa
https://doi.org/10.2118/6139-pa
Autor:
E. Survila, D.P. Andrews
Publikováno v:
Transactions of the IMF. 54:163-173
The paper discusses the latest practices in assessment of sealing tests for anodic oxidation coatings on aluminium, i e dye spot test, admittance test, and heir correlation with destructive tests b...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cf5e8175447de531ed17a1937d671a2b
https://doi.org/10.1080/00202967.1976.11870393
https://doi.org/10.1080/00202967.1976.11870393