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Badanie i optymalizacja szerokopasmowego transformatora dwukierunkowego

Krzemieniecki D.

Kwartalnik Elektroniki i Telekomunikacji

2005

Vol. 51, z. 3

387--419

W pracy zamieszczono analizę teoretyczną, wyniki pomiarów i metody optymalizacji szerokopasmowego transformatora dwukierunkowego. Przedstawiono dwie możliwe konfiguracje transformatora, oraz zbadano wpływy takich czynników jak: przenikalność początkowa, rezystancja balastowa, pojemności międzyzwojowe i montażowe. Do badań posłużono się transformatorem symetrycznym 15-decybelowym.

Object of present elaboration is complex analysis of symmetrical two-directional transformer (two-directional coupler). This is a new construction which may be use as a device of cable television (CATV), most often as tap. Executed they are on base of little, line 3x3 mm ferrite cores joined, on which wound are windings of the transformer. Examined transformer can exist in two usable configurations named here: basic and inverse. Work contains theoretical analysis and results of measurements and calculations of parameters of the transformer like: insertion losses of main and coupled line, isolation of output and tap, isolation of taps and return losses on input, output and tap in function of frequency in range 5 - 1000 MHz. In work examined influence of initial permeability (in range 100-10000), on parameters of the transformer, and such factors as ballast-resistor, zero-resistor considering of obtainment of optimum parameters and its influence on winding and assembly capability of the transformer and its parameters for high frequencies. Besides one examined possibilities of use of corrective arrangements having in view improvement of parameters of the transformer for low and high frequencies. One introduced also effects of such optimization for two possible configuration of the transformer. Taking into account optimization and influences of ballast and zero resistors one examined courses parameters of the transformer for its extreme frequencies of work: 5 and 862 MHz. General analysis of the transformer passed in regard on broadband its use, but results of researches can also be use for more particular arrangements. Work addressed is mostly to constructors and has in view help in projecting of arrangements taps. To researches used 15-dB symmetrical transformer with use of cores of initial permeability 1400 and 2500 produced by Taiwan.