摘要:

AbstractThree designs, a single‐stage, a parallel‐stage, and a two‐stage amplifier, for medium power monolithic GaAs MESFET amplifiers at Ka‐band are presented. The results obtained are consistent with other performances reported at these freq

ISSN:0895-2477    

DOI:10.1002/mop.4650030802

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractA differential operator describes the influence of space‐variant aberrations on a diffraction‐limited image, formed under coherent illumination. To illustrate our general treatment, the Talbot effect for space‐variant defocus is discussed in terms of the eigenfunctions of the differential ope

ISSN:0895-2477    

DOI:10.1002/mop.4650030803

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractThe intensity of second harmonic light beams generated in potassium dihydrogen phosphate (KDP) crystals immersed in the optically denser fluid I‐bromonaphthalene has been observed as a function of the incident angle of the fundamental beam of the neodymium‐glass laser. The laser pulses are polarized in the [110] direction with respect to the KDP crystallographic axes. We observed for the first time that there is no transmitted second harmonic light at normal incidence when the nonlinear polarization PNLS(2w) lies in the direction [001] along the crystal face normal. Furthermore, the noncollinear phase‐matching condition where the two incident fundamental beams are on the opposite side of the face normal is demonstrated. The results agree well with the theory of Bloembergen and Pe

ISSN:0895-2477    

DOI:10.1002/mop.4650030804

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractIn this paper a fast and straightforward waveguide measurement technique is described for the determination of the dielectric constant and loss tangent of many commercially available materials. These dielectric materials include Cuflon, Teflon, Arlon's polyimides, Lockheed's ceramic foams, and Rogers Duroid materials. The effective dielectric constant and loss tangent of Hexsel's honeycomb material is also measured by this method and is compared to the predicted data obtained using the volume averaging theory. The accuracy and other features of this measurement technique are also discussed.

ISSN:0895-2477    

DOI:10.1002/mop.4650030805

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractHybrid‐mode feeds exhibit good axisymmetric copolar radiation patterns and low cross polarization. Practical design often relies on an empirical cut‐and‐try approach and is therefore time consuming and costly. A new computer‐aided design, based on an optimization routine, is proposed and presented in this paper. The analysis employs the mode matching technique at approximated step junctions, and the optimization procedure uses the minimax algorithm. Validation of this approach is supported by the excellent agreement between computed and measur

ISSN:0895-2477    

DOI:10.1002/mop.4650030806

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractThe insertion loss contribution of concatenated connectors in fiber‐optic links is analyzed. A statistical approach based on the loss distribution of single connectors with a method for numerical convolution is developed. The predicted insertion loss is less than the sum of the “worst case” connector loss values. An avionics short‐haul fiber‐optic example illustrates the new

ISSN:0895-2477    

DOI:10.1002/mop.4650030807

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractA new approach for finding the cutoff frequencies of a dielectric waveguide based on the multifdament current model is presented. In this approach, the boundary conditions on the fields are taken in the cutoff limit. The method is applied to an elliptic dielectric waveguide.

ISSN:0895-2477    

DOI:10.1002/mop.4650030808

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractWe review the various forms of the coupled‐mode theory for optical waveguides. One subtle distinction between two different formulations of the conventional coupled‐mode theory is pointed out. Comparison of accuracy between them and the recently formulated new theory is conducted for the two‐ and three‐slab waveguide str

ISSN:0895-2477    

DOI:10.1002/mop.4650030809

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

摘要:

AbstractThe propagation of nonlinear TE, guided waves is simulated numerically using a new algorithm based on variational and finite‐difference methods, and their stability properties are investigated. The results indicate that portions of the solutions are not only unstable but may follow a route to chaos through period doubling as the guided‐wave power increa

ISSN:0895-2477    

DOI:10.1002/mop.4650030810

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY

ISSN:0895-2477    

DOI:10.1002/mop.4650030801

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1990

数据来源: WILEY