LOW-NOISE, LOW DC POWER LINEAR FET Pertti K. IldiHiinen. , Larry C. Witkowski*, and Yung-Chung Kao* ABSTRACT A two-tone third-order output intercept point (OIP3) of 45 dBm has been achieved at 10 GHz with a 280-µm GaAs MBE FET using only 248 mW of DC bias giving an OIP3/Pdc ratio of 128. Noise figure at that bias and tuning was 3.23 dB. Minimum noise figure of the same device was 1.43 dB. 

A I&:-BAND LOW-NOISE HEMT AMPLIFIER MMIC FOR RECEIVER . APrLICATIONS J. Wenger1, ABSTRACf A. Klaassen2, andP. Narozny1 A three stage monolithic low-noise HEMT amplifier has been designed and fabricated for Ku-band receiver applications. The key element for the ultra low noise figure of the amplifier is an AlGaAs/GaAs HEMT with 0.3 µm gate length and a gate width of 12 µim. Single devices hav

ELECTROMAGNETIC MODEL OF CIRCULAR-RECTANGULAR OMT1 Gaetano Francesco Cazzatell02, Vito Daniele3 ABSTRACT The junction shown in fig. I is the most important part of the ortomode transducer (OMT) in the antenna feed. Until now such junctions are experimentally designed because theoretical method of analysis is not available. This approach let's design GMT with bandwidth of 10% but we are develop

SCATTERING BY MAGNETIZED PARTIAL HEIGHT FERRITES IN RECTANGULAR WAVEGUIDES A. Prieto, M. A. Solano and A. Vegas ABSTRACT This comunication analyzes multiple discontinuities produced by magnetized partial height ferrite material in rectangular waveguides; each piece of ferrite can present discontinuities in the three directions of the coordinate system (3D). Each uniform waveguide is studied by S

THE SOLUTION OF WAVEGUIDES EIGENVALUES WITH ARBITRARY SHAPES BY FD-FD ALGORITHM. IN CURVILINEAR CO-ORDINATES L ZHAO* R G CARTER** ABSTRACT A finite-difference frequency-domain algorithm has been developed in non-orthogonal curvilinear co-ordinates. The full vector Maxwell's equations are discretized on boundaryfitted meshes. Because the algorithm is formulated in a non-orthogonal co-ordinate syst

PERIODIC CIRCULAR WAVEGUIDES CONTAINING AZIMUTHALLY MAGNETIZED FERRITE ROD A J F Orlando ABSTRACT Theoretical analysis and numerical results of the dispersion characteristic of a periodic circular waveguide loaded by an azimuthally magnetized ferrite rod are presented. Higher order modes are included in the slot region such that circularly non-symmetric quasi-TE modes that are affected by the co

FIELD DESIGN OF T E0l1-MODE WAVEGUIDE PASSBAND Fll...TERS Andrea Melloni1, Marco Politil, G. Guido Gentili2, Giuseppe Macchiarellal ABSTRACf A modified mode-matching technique for the analysis of waveguide bandpass filters employing circular TE011 resonators, coupled by rectangular apertures, is presented. The technique rigorously takes into account both the thickness of the coupling irises and t

RECONSTRUCTION OF THE EXCITATION OF ARRAY ANTENNAS MEASURED NEAR-FIELD INTENSITY USING rHASE RETRIEVAL J.A.Lord, G.G.Cook and A.P.Andersonl ABSTRACT FROM THE A technique is described to reconstruct the source distribution on an array antenna from the measured radiated intensity and the configuration of the elements. The reconstruction algorithm has been evaluated with measured data from a near-f

Determining Measurement Accuracy in Antenna Test .Johll W. Boyles Hewlett-Packard Company ]400 Fount.aillf,(I'OVC Parkway Santa Rosa, ct\ 9540a ABSTRACT The task of making accurate antenna measurements is, complicated by the numerous sources of measurement error in the antenna test range. In addition to the test system performance, the overall measurement uncertainty depends strongly upon th