摘要:

AbstractThe input impedance of a probe‐fed, annular‐ring‐loaded, circular‐disk microstrip antenna is analyzed using three methods of increasing complexity. The first method uses a new variational formula. The second method uses a mode‐matching method. The third method uses the mode‐matching method with a diaphragm at the coaxial aperture. The mode‐matching methods are identical to the variational formula under the single‐mode approximation. When a diaphragm is present, the singl‐mode approximation is insufficient, implying the variational formula is inaccurate when a diaphragm exists. The theory shows that the effect of the gap capacitance at the coaxial aperture on the input impedance of the microstrip antenna is important when the dielectric substrate is thick. The theories agree well with experiment data with

ISSN:0895-2477    

DOI:10.1002/mop.4650030302

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

年代:1990

数据来源: WILEY

摘要:

AbstractA high speed, integrated optical intensity modulator based on the application of an organic electrooptic active cladding to an otherwise inactive waveguide is proposed. Computer generated data supporting the proposed device configuration and material selections are presented. The future potential of such devices is discussed.

ISSN:0895-2477    

DOI:10.1002/mop.4650030303

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

年代:1990

数据来源: WILEY

摘要:

AbstractComputed results on the characteristic impedance of double‐sided slot‐lines on low‐permittivity substrates are presented. Curves for ϵr= 2.22, 3.0, and 3.8 are included. A spectral Galerkin method is employed to calculate the slotline wave number and the slot electric field. The characteristic impedance is then calculated in the spectral domain from the slot

ISSN:0895-2477    

DOI:10.1002/mop.4650030304

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

年代:1990

数据来源: WILEY

摘要:

AbstractA forward‐coupling microstrip hybrid with optimized coupling variation is described. The advantages of the new structure are its suitability for use at millimeter waves, high directivity, and relaxed fabrication tolerance. Experimental results from a 36‐GHz coupler are presen

ISSN:0895-2477    

DOI:10.1002/mop.4650030305

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

年代:1990

数据来源: WILEY

摘要:

AbstractNear field time‐average power distribution and radiation direction patterns are presented for a coaxial line flush‐mounted on an infinite ground plane and terminated with (a) an infinite homogeneous half space, (b) a hemispherical extended center conductor, (c) a hemispherical dielectric cover, and (d) a hemispherical extended center conductor with a dielectric coating. Expressions are given for the electric and magnetic fields and Green's functions for the dielectric coaled conducting hemisphere case, from which the fields and Green's functions for the other three cases can be constructed. Each of the four structures described here is either in use or has potential applications as an antenna or as a component in an external medium dielectric constant measurement sys

ISSN:0895-2477    

DOI:10.1002/mop.4650030306

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

年代:1990

数据来源: WILEY

摘要:

AbstractA theory of the cutoff attenuator for the azimuthally symmetric lowest order transverse electric mode in a cylindrical waveguide is developed. Illustrative numerical results of the insertion loss as well as the frequency response of the attenuator are presented.

ISSN:0895-2477    

DOI:10.1002/mop.4650030307

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

年代:1990

数据来源: WILEY

摘要:

AbstractA solution is given for reflection of a plane wave with TEM polarization from a planar surface with time varying properties. These properties are given in terms of the currents on the surface. The solution is obtained by numerically solving a system of differential‐delay equations in the time domai

ISSN:0895-2477    

DOI:10.1002/mop.4650030308

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

年代:1990

数据来源: WILEY

摘要:

AbstractAn object can always be subdivided into N subobjects. Hence, the scattering solution of an arbitrary‐shape inhomogeneous scatter can be formulated as a scattering solution of N scatterers, each of whose scattered field is approximated by M harmonics. This results in an NM unknown problem. A previously developed recursive operator algorithm, now adapted for wave scattering problems, can be used to solve this N scatterer problem. It is shown that the computational time of such an algorithm scales N2M2P where P is the number of harmonics used in the translation formulas. The scattered field from the same arbitrary shape scatterer can also be conventionally solved by the method of moments, casting it into an N linear algebraic equation. The solution of the linear algebraic equation via Gauss' elimination will involve order N3floating‐point operations. Hence, the complexity of the recursive operator algorithm is of lower order than the method of moments. It is shown that the recursive operator algorithm is more efficient than the method of moments when the number of unknowns is la

ISSN:0895-2477    

DOI:10.1002/mop.4650030309

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

年代:1990

数据来源: WILEY

摘要:

AbstractA method is proposed for using array element positions plus the element excitations in order to obtain both acceptable sum and difference patterns for a monopulse array with a two‐section feed network. Preliminary results are discusse

ISSN:0895-2477    

DOI:10.1002/mop.4650030310

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.4650030301

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

年代:1990

数据来源: WILEY