A NOVEL WIDEBAND MMIC ACTIVE BALUN I. D. Robertson and A. H. Aghvami * ABSTRACT A new technique for realising active baluns has been demonstrated in MMIC circuit uses distributed matching techniques and is capable of covering an wide frequency range. An MMIC prototype has been designed and tested, operation over 1 to 12 GHz has been achieved. This paper describes the circuit design and mea

A MINIATURIZED, BROADBAND MMIC BALANCED MIXER MODULE Tsutomu TAKENAKA Tsuneo TOKUMITSU* ABSTRACT This paper describes a miniaturized MMIC balanced mixer module composed of a 4-gate GaAs FET and slotline series T junction, where the combiner and dividers, in phase and out of phase, are unified in the electrode locations of the 4-gate GaAs FET to provide all of the fundamental functions requ

A RADIOFREQUENCY DEMODULATOR WITH AN BLBCTRICALLY QUADRATURB PHASE TUNING FOR M-QAM DIGITAL RADIO LINKS. X. LE POLOZEC (IEEE member), J. C. GUILLARD, D. FAYOL ABSTRACT This paper describes the design of a M-QAM radio-frequency demodulator, where a phase shifter is placed in one of the two channels (I or Q) to minimize the quadrature phase error between them by means of an automatic cont

ON THE DESIGN OF A 16QAM MODULATOR RADIO LINK SYSTEMS F.-E. Mueller * ABSTRACT IN THE MICROWAVE RANGE FOR The design of a 16QAM modulator as a simple planar microstrip structure for the 6.7 GHz range is described. Results gained by simulation and measurements are presented and give courage to make use of direct modulating the rf carrier signal to be transmitted. 

I NTERACTI ON BET'+i'EEN CONTROL LOOPS CARRI ER IN M-QAM RECOVERY DIGITAL AND RADIO AUTOMA TI C SYSTEMS GAI N J Kovat..s * ABSTRACT In the carrier analyzed. carrier t.he AGC paper the interaction between recvovery and the automatic As it.. will be shown this syntetizator failures. loop gain should be properly the decision-feedback gain control loops nteration may To avoid this problem. c

THE REDUNDANT IF 1 PREDISTORTER FOR 140 Mb/s 64-QAM RADIO Vilmos Geleji ABSTRACT A new arrangement, nonlinear AM-AM and the transmitter stages predistorter operates providing independent reduction AM-PM distortion components produced of a QAM radio link is given. without a variable phase-shifter. of by The 

A MICROWAVE AMPLITUDE SPACE DIVERSITY RECEIVER AND PHASE ALIGNEMENT SYSTEM FOR xavier LE POLOZEC & Jean Christophe GUILLARD ABSTRACT This paper describes the design of a space diversity microwave combiner which is used in a direct demodulation microwave link (16 QAM 140 Mbits/s) in the 6.4-7.1 GHz band. The space diversity microwave combiner consists of two variable gain low noise amplifiers

Angle Diversity Performance Links on Different Radio H.-G. Giloi, K. Metzger and R. Valentin Deutsche Bundespost TELEKOM Forschungsinstitut, Postf. 100005 D-6100 Darmstadt, Fed. Rep. of Germany Abstract The paper describes on two with whereas given that bending propagation different the second by the radius at ground-based digital radio responses. test experiments links. One difference Fresne

PERFORMANCE 110 GHz AND OF ABSORBERS 183 GHz AND ANECHOIC CHAMBERS AT J. Tuovinen, A. Lehto, A. Raisanen * ABSTRACT Three anechoic chambers and several different types of absorber panels have been measured at 110 and 183 GHz. Typical sidewall reflectivity levels of anechoic chambers are about -60 dB at 110 GHz and -50 dB at 183 GHz measured with 20 dB horns. Backwall reflectivity levels a

SIMPLE METHODS FOR TESTING THE TEMPERATURE DEPENDENCE OF MICROSTRIP ANTENNA ARRAYS . . Ferenc MERNYEI , Ferenc VOLGYI ABSTRACT This paper presents methods that can be used to determine the temperature dependence of microstrip antennas (MSA). The input reflection of the MSA array and the Radar Cross Section (RCS) was measured without special equipment in laboratory conditions. These experiments