摘要:

AbstractThis article derives a Lindell formulation based on a generalized variational principle. A complex dielectric constant measurement of a small‐loss dielectric rod using the Rayleigh—Ritz method gives accurate variational analysis. The concept of complex frequency ω is introduced in general, and the stability of the solution is discussed. When compared with the results of perturbation, it is concluded that the deviation of the algorithm is worthy of more atten

ISSN:0895-2477    

DOI:10.1002/mop.4650050502

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

年代:1992

数据来源: WILEY

摘要:

AbstractThe design process and experimental results are presented for a compact microwave injection wave pulse generator using high‐speed optical switches. This device generates a few cycles of 12‐GHz radiation, and has dimensions of 2.1 × 2.2 millime

ISSN:0895-2477    

DOI:10.1002/mop.4650050503

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

年代:1992

数据来源: WILEY

摘要:

AbstractIndustrial photoconductors are doped for large quantum yields. The resulting improvement in resistive dynamic range is accompanied by photocarrier traps. These traps enhance device hysterisis (or memory). The reduction in response speed mimics electrical reactance effects. This light history may be exploited in the construction of low‐frequency filters and oscillator

ISSN:0895-2477    

DOI:10.1002/mop.4650050504

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

年代:1992

数据来源: WILEY

摘要:

AbstractCharacteristics of traveling‐wave phase modulators fabricated with indium tinoxide (ITO) and silicon dioxide (SiO2) as buffer layers on Z‐cut LiNbO3substrate are compared at the wavelength 0.6328 μm. For those with an ITO buffer layer, a half‐wave voltage of 8.1 V and a bandwidth of 10 GHz are obtained, whereas for those with an SiO2buffer layer, a half‐wave voltage of 9.6 V and bandwidth 11 GHz are obtained. Hence the use of an ITO buffer layer may cause a reduction of the driving voltage and be capable of broadband o

ISSN:0895-2477    

DOI:10.1002/mop.4650050505

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

年代:1992

数据来源: WILEY

摘要:

AbstractA theoretical development for the analysis of a circular microstrip antenna on a spherical surface is described here. It consists of using the cavity model with magnetic side walls and the dyadic Green's function formulation. Expressions for calculating the resonant frequency and input impedance are given. A particular example with the antenna operating in its fundamental mode is examined. The characteristics of this antenna, including its radiation pattern, are presented.

ISSN:0895-2477    

DOI:10.1002/mop.4650050506

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

年代:1992

数据来源: WILEY

摘要:

AbstractA closed‐form multidimensional free‐space Green's function for the Helmholtz equation is obtained by the path‐integral method. The path‐integral method is novel and the general closed‐form free‐space Green's function is a useful expression which is not w

ISSN:0895-2477    

DOI:10.1002/mop.4650050507

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

年代:1992

数据来源: WILEY

摘要:

AbstractThe theoretically derived far‐field components of a circular ferrite microstrip antenna (FMA), biased axially by a steady magnetic field, are reported in this letter. The circular polarization, obtained theoretically, is compared with the measured resul

ISSN:0895-2477    

DOI:10.1002/mop.4650050508

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

年代:1992

数据来源: WILEY

摘要:

AbstractA linearly polarized traveling‐wave microstrip array antenna is parallel and series fed by microstrip transmission lines. Excellent antenna efficiency is achieved by having proper impedance matching throughout the array and by properly utilizing the reflected power from the end of the array. Very low cross‐polarization radiation is achieved by exciting the patches and transmission lines with antiphase techni

ISSN:0895-2477    

DOI:10.1002/mop.4650050509

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

年代:1992

数据来源: WILEY

摘要:

AbstractWe have fabricated and tested several 8.8‐GHz coplanar waveguide resonators made from laser ablated YBa2Cu3O7‐bthin films on LaAlO3substrates. A quality factor of 1250 at 77 K was measured. A correlation between the microwave performance of the resonators and the critical temperature and morphology of the films was obser

ISSN:0895-2477    

DOI:10.1002/mop.4650050510

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

年代:1992

数据来源: WILEY

摘要:

AbstractSequentially rotated feeding improves the axial ratio and input VSWR bandwidths of circularly polarized arrays. However, when dual polarization is wanted, the method is shown not to improve isolation, as is the case for dual linearly polarized arrays. This deficiency is overcome by squinting the beam. Measured results for a small array confirm this and computations for large arrays indicate performance capabilities.

ISSN:0895-2477    

DOI:10.1002/mop.4650050511

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

年代:1992

数据来源: WILEY