摘要:

AbstractThe potential use of planar periodic gratings, consisting of thin conducting strips, as frequency scanned gratings is investigated. The analysis is based on a modal expansion method, Floquet's theorem, and the method of moments. Experimental and theoretical results are presented. © 1992 John Wiley&Sons, Inc

ISSN:0895-2477    

DOI:10.1002/mop.4650051402

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

年代:1992

数据来源: WILEY

摘要:

AbstractThe cylindrical dielectric waveguide with a periodically varying radius has been analyzed numerically. Leakage characteristics of the mode are investigated for the various waveguide parameters. It is shown that the direction of the radiative leakage can be adjusted by varying the periodicity. © 1992 John Wiley&Sons, Inc

ISSN:0895-2477    

DOI:10.1002/mop.4650051404

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

年代:1992

数据来源: WILEY

摘要:

AbstractAn analogue frequency divider implemented with a new GaAs high electron mobility transistor (HEMT) MMIC technology is presented. This frequency divider is based on the frequency regeneration principle. The circuit operates in a frequency division bandwidth of 700 MHz at — I dBm incident input power level around 12.8 GHz. © 1992 John Wiley&Sons, I

ISSN:0895-2477    

DOI:10.1002/mop.4650051405

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

年代:1992

数据来源: WILEY

摘要:

AbstractWe describe a monolithic phase shifter which combines the low loss of high‐temperature superconductivity (HTS) with the variable dielectric properties of a ferroelectric material SrTiO3. Phase shifts greater than 28 degrees per wavelength were observed around 30° K. The compatibility of YBa2Cu3O7‐xand other ferroelectric materials is discussed. © 1992 John Wiley&Sons

ISSN:0895-2477    

DOI:10.1002/mop.4650051406

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

年代:1992

数据来源: WILEY

摘要:

AbstractThe effective dielectric constant and the characteristic impedance of a stripline filled with a number of dielectrics has been investigated. Their dependence on some of the geometric parameters is presented. © 1992 John Wiley&Sons, Inc

ISSN:0895-2477    

DOI:10.1002/mop.4650051407

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

年代:1992

数据来源: WILEY

摘要:

AbstractDetermination of the material parameters for a general bi‐isotropic medium with a waveguide technique is considered. The bi‐isotropic medium is in general nonreciprocal; the amount of nonreciprocity can be determined by measuring the frequency difference between an empty cavity resonator and a cavity resonator with a small bi‐isotropic sample. The chirality of the medium cannot be determined with such a method. Also, the method based on measuring the propagation factor of a perfectly conducting waveguide with a bi‐isotropic rod gives no information about the chirality parameter. It can, however, be determined by measuring the change of the propagation factor in a corrugated waveguide with and without a bi‐isotropic rod by using two different modes propagating in a corrugated waveguide. © 1992 John Wiley

ISSN:0895-2477    

DOI:10.1002/mop.4650051408

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

年代:1992

数据来源: WILEY

摘要:

AbstractThe lines of reasoning on the maximum numbers of independent adjustable parameters, peaks, and valleys in an arbitrarily shaped linear factor are clearly stated and the corresponding characteristics table is also completely constructed in this article. The array factor may be either unsymmetrical or symmetrical, and with arbitrary odd or even number of exciting currents. So far as the author knows, this table appears for the first time in the open literature, and it is believed to be of much help to the designers of equispaced linear antenna arrays when numerically optimizing the differently specified peak and valley levels of the array factor by adjusting the available independent parameters related to the exciting currents in the element antennas. When the formulas tabulated in the array factor characteristics table are used to compare with the synthesized results using the well‐known numerical method for optimizing the synthesis of an arbitrary shaped array factor by Orchard, Elliott, and Stern [1] and Elliott [2], they show exact agreement. © 1992 John Wiley&Sons, I

ISSN:0895-2477    

DOI:10.1002/mop.4650051409

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

年代:1992

数据来源: WILEY

摘要:

AbstractA new method is developed to analyze electromagnetic coupling to an angled two‐wire transmission line. It consists of solving the cylindrical transmission line equations analytically, and then adjusting the involved parameters to support the cylindrical TEM mode along its equivalent model of the angled two‐plate transmission line. The validity of the derived solution is assured by showing its convergence to the numerical value obtained by using the circuit concept approach. © 1992 John Wiley&Sons,

ISSN:0895-2477    

DOI:10.1002/mop.4650051410

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

年代:1992

数据来源: WILEY

摘要:

AbstractOptical digital pulse position modulation (DPPM) is an effective modulation format for both free space and fiber communications. However, for the latter, system synchronization has not been considered. Here, we address this issue and present an original expression, supported by practical results, for evaluating the frame spectral properties of optical fiber DPPM. We use the established properties to optimize frame synchronization while using a dispersed DPPM pulse shape which is representative of optical fiber systems © 1992 John Wiley&Sons, Inc

ISSN:0895-2477    

DOI:10.1002/mop.4650051411

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

年代:1992

数据来源: WILEY

摘要:

AbstractThe normalized longitudinal and transverse current distributions of a microstrip line on a ferrite substrate are obtained using the spectral domain approach for vertical magnetization. The dispersive properties of the line [characteristic impedance and effective permeability μeff(f)] are accurately evaluated. The new current distributions speed up the numerical computation of the parameters at different frequencies. © 1992 John Wiley&Sons, In

ISSN:0895-2477    

DOI:10.1002/mop.4650051412

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

年代:1992

数据来源: WILEY