3 dB, 90°, DC BLOCK DIRECTIONAL COUPLER C. Buoli (*) ABSTRACT The circuit equivalence between coupled-line structures and single-line structures is used to represent the four branches of the branchline directional coupler by means of coupled lines. A new type of directional coupler results (**), in which all the four ports show DC isolation between them. It can be utilized, with no design i

BROADBAND NON-UNIFORM FIN-LINE COUPLERS FREQUENCIES AT MILLIMETRE-WAVE E. KPODZO*, G.B. GAJDA* and R. TOMAR* ABSTRACT Analysis and design of broadband fin-line non-uniform slot spacing is described. Preliminary both analytical and experimental, show the viability types of couplers at millimetre-wave frequencies. couplers using results, of these 

S BAND HIGH POWER C CLASS OPERATIN} AMPLIFIER WITH A :L<:N} PULSE V. Alleva *, L. Chiappe * ABSTRACT This paper concerns the realization of a high power S band amplifier for an ATC radar System Transmitter. Such an amplifier, for its design approach, may be considered ing block of a Solid State Transmitter. driver a build- 

MONOLITHIC TRANSMIT MODULES FOR A MULTIBEAM Ku -BAND PHASED-ARRAY ANTENNA R. C. Mott,* J. R. Potukuchi,* R. K. Gupta,* A. I. Zaghloul,* S. Siddiqi,** and S. E. Gourley* ABSTRACT This paper presents the design and performance of Ku-band transmit modules that were developed for insertion in a multibeam active phased array. The design considerations and performance of the transmit module's monolithi

A CELL-BASED WIDEBAND MONOLITHIC UPCONVERTER Fazal AIi, Sanjay Moghe, ABSTRACT A fully monolithic wideband upconverter has been developed and tested using a cellbased design approach. This upconverter consists of an RF amplifier cell, a broadband diode mixer cell, and an LO buffer amplifier cell. The chip (48 x 96 mils) has been tested at different LO frequencies between 9 and 14 GHz with a swept

LP/OO\N MIXERS Fffi St\TELLITE CXMvtNICATIQ\E UTILIZIt\G RAT-RACE CII\UJITS MAKOTO HASEGAWA, KauEI MISAIZU, HARUYOSHI ENDO, AND MITSUO MAKlfI'OTO * [ .ABSTRICT ] A new design for up and down mixers, utilizing rat-race circuits for microwave-band transmitters and receivers, has been introduced. These MIC mixers provide the advantages of small size, low cost and ease of producibility. Additiona

ERROR PERIODIC CORRECTED WAVEFORM MICROWAVE VOLTAGE MEASUREMENTS AND CURRENT Markku SipiUi, Kari Lehtinen, Veikko Porra ABSTRACT A system is described to measure the periodic time domain voltages and currents of a nonlinear microwave device. A vector error correction algorithm is used to take into account and correct the errors caused by imperfect microwave hardware. The system can also

THE ABSOLUTE FREE SPACE D G Moss, DETERMINATION OF NEAR MILLIMETRE WAVE POWER IN J R Birch, D H Martin and G W Poulson. ABSTRACT An absolute power measuring facility for the calibration of free-field power meters at near millimetre wavelengths, is described. Accuracy is two percent at the one milliwatt level, a tenfold improvement over present free field methods. The measuring principle

BROADBAND FREQUENCY DOMAIN SCREENING MEASUREMENTS ON RF-CABLES B. Eicher*, H. Fahrni**, C. staeger*, B. Szentkuti* ABSTRACT The measurement of screening effectiveness on cable assemblies is very difficult to perform over broad frequency ranges (e.g. from several kHz to more than 3 GHz). A new type of test set-up has been developed and tested with a transmission type wire injection princi

MICROWAVE PROPERTIES OF HIGH-T c SUPERCONDUCTORS H . Ch a 1oup k a, ABSTRACT The line 2) M . H em. . 1) . U . Kl em. 3) 1) .. G . 1 UII er. M . 1) H . P Ie 1 rf surface impedance and of bulk was and electrophoretically at 3.5 and results to term below the deposited 21.5 cavities of GHz as 92 via a polycristalperturbation function the fall at strongly passive of Y Ba Cu O sample