Knowledge Centre
Find a document written by the best international scientists in our secure database.
24776 documents found.
ACTIVE X-BAND PHASED ARRAY MODULES AND THEIR PHASE STABILITY
ACTIVE X-BAND PHASED ARRAY MODULES AND THEIR PHASE STABILITY H. Steyskal Sr. ABSTRACT MIC-transmit-receive units wlih 1 W CW output each were. formodule.. Ga.As IMPATT diode power amplifiers and ferrite. phase. shifters were. used This type. of components produced phase tracking of about 0.8 phase degrees/°C in CW operation, thereby setting limits for uncontrolled temperature differences in lar
A HIGH-CAPACITY SATELLITE UTILIZING FIXED AND SCANNING SPOT ANTENNA BEAMS
A HIGH-CAPACITY SATELLITE UTILIZING FIXED AND SCANNING SPOT ANTENNA BEAMS D. O. Reudink and Y. S. Yeh* ABSTRACT We discuss one possible implementation of a satellite which has the advantage of providing high EIRP, high capacity and universal service. The approach employs Satellite Switched Time Division Multiple Access (TDMA) where one of the spotbeams is a scanning beam. The transponder for t
AN ACCURATE BROADBAND DESKTOP COMPUTER MODELING FOR RADIAL MICROWAVE CIRCUITS
AN ACCURATE CIRCUITS BROADBAND DESKTOP COMPUTER MODELING FOR RADIAL MICROWAVE A.C. DERYCKE . ~ , L. DUPONT, M. Del GUIDICE ~~ and G. SALMER . ABSTRACT An efficient and accurate desktop computer model for radial integrated microwave circuits is presented. This model uses the near field approximation encountered in the antenna theory by considering the particular mode spectrum of the
ANALYSIS OF SOME THREE-DIMENSIONAL MICROSTRIP DISCONTINUITIES IN TERMS OF FREQUENCY.
ANALYSIS FREQUENCY. OF SOME THREE-DIMENSIONAL MICROSTRIP DISCONTINUITIES IN TERMS OF By A. ROS, T. JARKAS and D. POMPEI Abstract: In the earty seventies, JOHNS introduced the Transmission Line Matrix (T.L.M.) Method. More recently AKHTARZAD applied this technics to some resonant cavities problems. Using this method, we have studied microstrip discontinuities such as the transition between
NEW MICROSTRIP TRANSMISSION LINES FOR MICROWAVE INTEGRATED CIRCUITS
NEW MICROSTRIP TRANSMISSION LINES FOR MICROWAVE INTEGRATED CIRCUITS K. Sachse, A. Sawicki ABSTRACT The paper discusses the properties of new microstrip transmission lines using a slot in the ground-plane. These lines have high characteristic impedance and their attenuation and frequency dispersion as well are small. A very tightly coupled cross-section of microstrip lines may be constructe
FIELD DESCRIPTION FOR MULTI-SLOT FIN-LINE STRUCTURES
FIELD DESORIPTION FOR MULTI-SLOT FIN-LINE STRUOTURES Abdel Megid Kamal Saad and Klaus Schunemann Abstract: A generalized fin-line structure is analyzed, which shows several slots in the metal coating of the substrate. Possible applications of such a structure are e.g. directional couplers and 3 dB hybrids. Out-off frequencies, phase constants, and electric and magnetic field patterns are calcu
GUIDING CHARACTERISTICS AND RADIATION CHARACTERISTICS OF PLANAR WAVEGUIDES
GUIDING CHARACTERISTICS AND RADIATION CHARACTERISTICS OF PLANAR WAVEGUIDES Helmut Ermert ABSTRACT Planar waveguides like microstrip and microslot have been used not only as waveguides but also for radiation purposes (microstrip antenna). Therefore, the paper tries to give a clear description of waveguide characteristics as well as radiation characteristics of planar waveguides. The difference
CONTINUOUS EIGENVALUE MODE SPECTRUM ANALYSIS OF MICROSTRIP OPEN-CIRCUIT TERMINATIONS
CONTINUOUS EIGENVALUE TERMINATIONS A. Henderson and J.R. MODE SPECTRUM ANALYSIS OF MICROSTRIP OPEN-CIRCUIT James ABSTRACT A new analysis of the open-circuit microstrip termination is described which enables all of the reflection, transmission, radiation and surface wave effects to be calculated. The formulation is based on a continuous eigenvalue mode spectrum and provides the most complete t
COUPLED-COMBLINE STRUCTURES FOR USE IN M.I.C. 'S.
CQUPLED-COMBLINE STRUCTURES FOR USE IN M.I.C. 'So Vittorio Rizzoli (1) - Alessandro Lipparini (1) Abstract. were built Passive M.I.C. components available made of coupled-comb line sections approach for desig~ Making use of coupled-tran~ strucand is optiin the present assumption The analysis when by empirical techniques optimization, and but a theoretical so far. formalism ing suc
COUPLED-LINE DIRECTIONAL COUPLERS FOR M.I.C.
COUPLED-LINE DIRECTIONAL COUPLERS FOR M.I.C. M. HOUDART * ABSTRACT --- Following a general consideration of the concept of directional couplers in an inhomogeneous medium and physically asymmetrical couplers, this paper reviews various new types of MIC couplers carring, sometimes simultaneously, different propagation modes (microstrip, coplanar line, slot 1ine). Experimental results are pres