摘要:

AbstractTwo novel quasioptical mixers using patch antennas and compact local oscillator (LO) ports are described: a fundamentally pumped mixer with a waveguide LO and a subharmonically pumped mixer with a planar LO. The angular dependence of the antenna patterns, the isotropic conversion loss, and the mixer noise figure are presented. A 7.5‐dB noise figure has been measured at 35 GHz for the subharmonically pumped design. The importance of the effective antenna temperature and its effect on the mixer noise figure are discusse

ISSN:0895-2477    

DOI:10.1002/mop.4650010102

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

年代:1988

数据来源: WILEY

摘要:

AbstractWe have compared theoretical and experimental performance of microwave radial‐line filters using air or teflon dielectrics. We found good agreement, with errors in the calculation of the resonance frequency of less than 1% for impedances in the range 10‐8

ISSN:0895-2477    

DOI:10.1002/mop.4650010103

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

年代:1988

数据来源: WILEY

摘要:

AbstractActive antenna elements have been fabricated using Gunn diodes and microstrip patch antennas. The power outputs from two of these elements have been successfully combined in space. Frequency coherency was achieved by injection locking using either the spatial locking technique or the mutual coupling locking technique.

ISSN:0895-2477    

DOI:10.1002/mop.4650010104

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

年代:1988

数据来源: WILEY

摘要:

AbstractThe output power and operating (bias) point for 80‐100‐GHz GaAs TED oscillators have been investigated for temperatures between 300 and 40d̀ K. It is shown experimentally that the power can be increased by as much as nearly four times by cooling the oscillator. The thermal design of the oscillator was studied for GaAs and InP TED oscilla

ISSN:0895-2477    

DOI:10.1002/mop.4650010105

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

年代:1988

数据来源: WILEY

摘要:

AbstractThis paper reports on experimental results of an optical gain control of a GaAs microwave monolithic integrated circuit (MMIC) distributed amplifier. The amplifier gain was varied by 15 dB and was controlled by a LED (250 μW) over the frequency range of 5‐8 GHz. The key to this investigation is the development of a simple inexpensive optical control mechanism that is compatible with MMIC fabrication metho

ISSN:0895-2477    

DOI:10.1002/mop.4650010106

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

年代:1988

数据来源: WILEY

摘要:

AbstractAn analytical method for estimating the transmission characteristics of a composite circular planar circuit is presented. The impedance matrix of the circuit is calculated from the circular harmonic expansion of fields. The calculated values of the transmission parameters are compared with experimental results.

ISSN:0895-2477    

DOI:10.1002/mop.4650010107

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

年代:1988

数据来源: WILEY

摘要:

AbstractDesign of a fully monolithically integrable active circulator without any externally added circuit components is described in this paper. Two different configurations for active circulators using power dividers and Lange couplers are investigated. The circuit using Lange couplers indicates superior performance and is capable of providing O‐dB loss and return loss and isolation better than 16 dB and 23 dB, respectively, over an octave or higher bandwidt

ISSN:0895-2477    

DOI:10.1002/mop.4650010108

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

年代:1988

数据来源: WILEY

摘要:

AbstractA novel surface‐emitting laser design that utilizes leaky mode emission is proposed. Power is coupled out of the active layer in a narrow beam by monolithically integrating a prism‐like structure with a conventional semiconductor laser. Threshold current densities and external efficiencies approximately 1 kA / cm2and 0.3, respectively, are estima

ISSN:0895-2477    

DOI:10.1002/mop.4650010109

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

年代:1988

数据来源: WILEY

摘要:

AbstractThe definition of frequency dependent strip characteristic impedance for multiconductor transmission lines in inhomogeneous dielectric media is discussed. The considerations are based on orthogonality properties for the eigencurrent and eigenvoltage vectors of propagation modes that have been presented by Marx and Nagai for the TEM case and are now extended to general hybrid‐mode structures. The definition adopted takes care of the reciprocity of transmission line structures and is essential to get consistent simulation results in the CAD of MICs and MMIC

ISSN:0895-2477    

DOI:10.1002/mop.4650010110

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

年代:1988

数据来源: WILEY

摘要:

AbstractA feed network comprised of a combination of coplanar waveguide and slot transmission line is described for use in an array module of four microstrip elements. Examples of the module incorporating such networks are presented as well as experimentally obtained impedance and radiation characteristics.

ISSN:0895-2477    

DOI:10.1002/mop.4650010111

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

年代:1988

数据来源: WILEY