FUNDAMENTAL CHARACTERISTICS USING HIGH PERMITTIVITY Kazunori Takeuchi OF A SLOT-COUPLED MICROSTRIP ANTENNA FEED SUBSTRATE Wataru Chujo Masayuki Fujise ABSTRACT A slot-coupled microstrip antenna with high permittivity feed substrate and low permittivity antenna substrate has been investigated. Both measured and calculated results of input resistance and resonant frequency of the antenna on the d

Millimeter-Wave MIC and MMIC Amplifiers using Pseudomorphic HEMT Kiyoyasu SHIBATA*, Hiroyuki YOSHINAGA*, Toshio SHINO* and Shigekazu HOR 1* Abstract This paper reviews the recent works at Toshiba millimeter-wave amplifiers based on the pseudomorphic HEMTs. The HEMT devices used is 0.1 µm-gate planar doped pseudomorphic HEMT with a gate of 43 been noise chips width of 50 or 100 µm. Structures, perf

OVERVIEW OF JAPANESE PROPAGATION STUDIES FOR FUTURE SATELLITE COMMUNICATIONS Matsuichi YAMADA * and Yoshio KARAS AWA* ABSTRACT Recent activities of propagation studies for satellite communications in Japan are summarized. The results of such studies for mobile-satellite systems and fixedsatellite systems, and countermeasures for propagation impairments are described. Finally, some plans of propaga

LOW CONVERSION LOSS Ka-BAND GaAs MONOLITHIC DIODE MIXERS 1, RJ. Lana1, SS. Bhumbra SJ. Niahtinaale2 & MG. McDermotr ABSTRACT The design and test of two 35GHz low-loss GaAs monolithic balanced diode mixers are reported. A proprietary harmonic balance simulator was used to design the mixers which were fabricated at the Alpha Industries foundry. A first-pass design success was achieved. Measurem

S-BAND MONOLITHIC ACTIVE RESONATOR TECHNIQUE FILTER USING ACTIVELY-COUPLED M.R. Moazzam., J.D. Robertson., A.H. Aghvami. and M. Guglielmi" ABSTRACT A highly-selective bandpass active filter design technique is presented which uses a monolithic actively-coupled resonator cell combined with additional transmission zeros implemented with off-chip microstrip line resonators. The technique giv

A 12-36 GHz MMIC 3dB COPLANAR WAVEGUIDE DIRECTIONAL COUPLER MATTHEW GILLICK*, IAN D. ROBERTSON*, JAI S. JOSHI** ABSTRACT For the first time, a multilayer coplanar waveguide (CPW) coupled-line 3dB directional coupler has been realised, 'by using two metal layers on an MMIC substrate. In the frequency range 12-36 GHz, the coupler has an equal power imbalance of less than 1 dB. The coupler design inc

K- and C-Band Low Phase Noise MMIC Using a Linear Varactor Masahiro Muraguchi* and Hideki Kamitsuna** ABSTRACT VCOs A new circuit configuration is proposed for low phase noise YCOs. A linear varactor consisting of an FET varistor and an MIM capacitor eliminates 1/f noise up-conversion of the frequency tuning element. The measured results of the fabricated 20 GHz- and 6 GHz-band MMIC YCOs indicat

OPTICAL CONTROL OF MMIC BASED PHASED ARRAY AT C-BAND A. S. Daryoush+, R. Saedi+, N. Samant+, P. R. Herczfeld* and M. Belaga* ABSTRACf Experiments performed on a 2x4 active MMIC based phased array antenna system are described. The active MMICs operating at C-band are controlled and fed via fiber optic links. The TIR level data mixing scheme for up-conversion (down-conversion) of the IF (RF) to RF

HIGH-EFFICIENCY RADIATION KU-BAND SSB MODULATOR FOR PULSED IR LASER C. Forst-, P. Kalkert-, H.J. Schmitt-Abstract We present an electrooptical modulator with a large cross-section (~ 6.2 mm) used for the 55B modulation of IR-laser radiation at frequencies in the KU-band. The development of a new laser coupler enables the simple coupling of laser radiation into the waveguide system which contain

INDIRECT OPTICALLY CONTROLLED PSEUDOMORPHIC HEMT BASED MMIC OSCILLATOR A. Bangert*, W. Benz, M. Berroth, A. HUlsmann, V. Hunn, G. Kaufel, K. Kl>hler,J. Rosenzweig, Jo. Schneider ABSTRACT For the ftrst time an indirect optically controlled monolithic integrated oscillator was fabricated and examined experimentally. The oscillator was designed for a frequency of about 7 GHz. By illuminating a 60