摘要:

AbstractA two‐grid approach for quasioptical bandpass filter design is presented. In this design, an inductive/capacitive grid on one side of a dielectric substrate is transformed to an effective capacitive/inductive reactance at the other grid plate, producing a parallel resonant circuit. Two bandpass filters for use in the millimeter region have been fabricated. Low‐loss power transmission at the design frequencies has been achieved with good quantitative agreement with theory. © 1992 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650051102

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

年代:1992

数据来源: WILEY

摘要:

AbstractA novel electrical noise source is proposed, based on lightwave components and internal shot‐noise calibration, which offers an attractive alternative to conventional 50‐Ω noise sources. This report describes the principle, and the experimental verification of various quality aspects like linearity, absolute accuracy, and impedance robustness. © 1992 John Wiley&Sons

ISSN:0895-2477    

DOI:10.1002/mop.4650051103

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

年代:1992

数据来源: WILEY

摘要:

AbstractVarious coaxial line structures having a cross section in which an equiarmed cross is concentric with an external square are analyzed by means of numerical inversion of the Schwarz‐Christoffel conformal transformation, considering angular offset between conductors and electric or magnetic side walls. Geometries with rectangular outer conductor and off‐centered inner cross conductors are considered. Previous works by Riblet [1] and Lin [2–4]are generalized or completed. © 1992 John Wiley&Son

ISSN:0895-2477    

DOI:10.1002/mop.4650051104

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

年代:1992

数据来源: WILEY

摘要:

AbstractReduction of radar cross‐section of dihedral corner reflectors using simulated corrugated surface (SCS) is reported. This technique is found to be more effective in the reduction of RCS or corner reflectors for normal incidence. A typical reduction of 40–50 dB is achieved using this method. © 1992 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650051105

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

年代:1992

数据来源: WILEY

摘要:

AbstractThe article presents a methodology to generalize the branching synthesis method for synthesizing symmetrical ring structures with transmission‐line section branches of any electrical length. The procedure is applied to a five‐port junction which, in connection with a directional coupler, forms a six‐port for measurement applications. © 1992 John Wiley&Son

ISSN:0895-2477    

DOI:10.1002/mop.4650051106

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

年代:1992

数据来源: WILEY

摘要:

AbstractA novel tuning structure for the identical three‐guide coupler is proposed to obtain high power transfer efficiency without waveguide bending. The basic principles of three‐guide couplers with a symmetric tuning are analyzed by applying the exact slab theory. Based on numerical calculations, novel coupling characteristics of the tuning structure, compared with those of the identical three‐guide coupler, are demonstrated, and their possible applications are discussed. © 1992 John Wiley&Son

ISSN:0895-2477    

DOI:10.1002/mop.4650051107

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

年代:1992

数据来源: WILEY

摘要:

AbstractIn this article the Green's function of the transverse scalar potential V is studied extensively. For a grounded single‐layered substrate the analytical expressions are derived and a detailed discussion of the quadrature of the Sommerfeld integral is given. The singularity due to the surface wave is examined by means of a Taylor expansion and constitutes the correct evaluation of the integral. By separating the function into a regular and a singular part the Green's function is calculated exactly. The results are compared with the static approximation in the space domain. © 1992 John Wiley&Sons. I

ISSN:0895-2477    

DOI:10.1002/mop.4650051108

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

年代:1992

数据来源: WILEY

摘要:

AbstractA comprehensive study of the mutual coupling between two rectangular microstrip patch antennas is presented. Using the cavity model, numerical results for both mutual impedance and mutual coupling parameter are given for the E‐plane, H‐plane, diagonal, and perpendicular orientations. The effects of substrate thickness, substrate permittivity, and feed positions are discussed. © 1992 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650051109

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

年代:1992

数据来源: WILEY

摘要:

AbstractIn this article calculations of power components transmitted and reflected at the step discontinuities in dielectric‐slab and dielectric‐loaded waveguides are presented using the geometric‐optics approach. Step discontinuities regarding the dielectric slab thickness and refractive index are considered. Numerical results are shown to be in good agreement with those of other rigorous methods. The computation involved in this approach is efficient since the associated mathematical formulation can be analytically expressed from the geometric optics point of view. © 1992 John Wiley&Son

ISSN:0895-2477    

DOI:10.1002/mop.4650051110

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

年代:1992

数据来源: WILEY

摘要:

AbstractThis article presents a method of transistor parameter extraction using multiharmonic Load‐Pull (MHLP) measurements completed with modified harmonic balance calculations. An advantage of this approach is that the parameters of the nonlinear elements of the transistor are obtained solely from large‐signal measurements at the fundamental and the generated harmonic frequencies. The calculated parameters of the nonlinear model of a commercial MESFET (NE 71083), are found suitable for large‐signal operating mode at different impedance loading. © 1992 John Wiley&Son

ISSN:0895-2477    

DOI:10.1002/mop.4650051111

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

年代:1992

数据来源: WILEY