摘要:

AbstractA lattice‐matched InGaAs/InAlAs resonant tunnelling diode is studied as a video detector in the millimeter‐wave range. Tangential signal sensitivity and video resistance measurements are made as a function of bias and frequency. A tangential signal sensitivity of — 37 dBm (1 MHz amplifier bandwidth) with a corresponding video resistance of 350 Ω at 40 GHz has been measured. These results, to the best of our knowledge, are the first millimeter‐wave tangential signal sensitivity and video resistance results for a resonant tunnelli

ISSN:0895-2477    

DOI:10.1002/mop.4650030102

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

年代:1990

数据来源: WILEY

摘要:

AbstractAn efficient technique based on the quasi‐TEM spectral domain analysis is formulated to compute the characteristic parameters of multiconductor‐multilayered structures with finite thickness conductors having trapezoidal and rectangular cross sections. Computed results for typical single and coupled lines on alumina and GaAs substrates are presented and compared with results based on finite and boundary element techniques and measured data for the effective dielectric const

ISSN:0895-2477    

DOI:10.1002/mop.4650030103

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

年代:1990

数据来源: WILEY

摘要:

AbstractThe short‐circuit, match, and antenna components of RCS are examined for a thin‐wire dipole over a range of lengths and incidence angles. Resonances are identified and discussed in terms of current distributions and antenna patterns. The antenna component contains more resonant peaks than the short‐circuit component due to differences in current distribution. The results are useful for RCS understanding and co

ISSN:0895-2477    

DOI:10.1002/mop.4650030104

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

年代:1990

数据来源: WILEY

摘要:

AbstractDielectric constants of microwave subtrales are required in the design of superconducting microwave circuits at various temperatures. In this paper, we report the results of a study of the complex permittivity of the newly developed lanthanum aluminate (LaAIO3) substrate, in the 20 to 300 K temperature range at frequencies from 26.5 to 40.0 GHz. The value of the complex permittivity was obtained by measuring the sample scattering parameters using a microwave waveguide technique. It is observed that, while the dielectric constant did not change appreciably with frequency, its value decreased by approximately 14 percent from room temperature to 20 K.

ISSN:0895-2477    

DOI:10.1002/mop.4650030105

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

年代:1990

数据来源: WILEY

摘要:

AbstractThis paper shows a comparative study for two main different approaches of modified harmonic balance techniques. The first modification is based on a broadband sampling theorem and uses simple modifications to the DFT algorithm (called MDFT). The second method is based on a bandpass sampling theorem and is called the controlled aliasing technique.

ISSN:0895-2477    

DOI:10.1002/mop.4650030106

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

年代:1990

数据来源: WILEY

摘要:

AbstractA comparison between four designs of dual‐polarized microstrip arrays is reported. The measured coupling between ports, the cross polarization, and the gain are presented and discusse

ISSN:0895-2477    

DOI:10.1002/mop.4650030107

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

年代:1990

数据来源: WILEY

摘要:

AbstractIn this letter, a complete small‐signal analysis for frequency chirping in the semiconductor‐optical fiber ring laser is presented. It shows that chirp‐to‐power ratio (CPR) strongly depends on the junction phase shift, the optical coupling, and the phase detuning between two cavities, especially if the modulation frequency is below the gigahert

ISSN:0895-2477    

DOI:10.1002/mop.4650030108

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

年代:1990

数据来源: WILEY

摘要:

AbstractThe Bimodal Optical Computer (BOC) is considered for Adaptive Phase Array Radar (APAR) data processing. The effect of the errors in the BOC and the number of iterations on the optimum weight calculations for the interference cancelling are studied. Computer simulations for five‐and nine‐element APARs are presen

ISSN:0895-2477    

DOI:10.1002/mop.4650030109

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

年代:1990

数据来源: WILEY

摘要:

AbstractIn this paper we shall show that blurred photographic images due to linear motion can be restored with a joint transform processor (JTP). The deconvolution function for the image deblurring can be directly implemented at the input plane of a JTP. The bipolarity of the deconvolution function can be accomplished by encoding with a ±‐shifted grating structure. Computer simulations to test the feasibility of the scheme are giv

ISSN:0895-2477    

DOI:10.1002/mop.4650030110

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

年代:1990

数据来源: WILEY

摘要:

AbstractIn this paper a theoretical model of a mechanical displacement sensor based on the theory of the optical Gaussian beam emerging from an optical single mode and the recoupling through a multimode optical fiber is presented. The developed model presents a dynamic region of measurements from 0 to 130 μm

ISSN:0895-2477    

DOI:10.1002/mop.4650030111

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

年代:1990

数据来源: WILEY