Abstract
As the width of short-wave broadcasting bands increases the problem of matching arrays is becoming more important. It is desirable to match the array to the transmission line over the whole band in order that the line voltage will not be excessive, and also that the transmitter output circuit may be correctly adjusted at any operating frequency. This report describes a possible modification of existing matching technique which has this object in view.
Instead of modifying the line characteristic impedance over a short length near to the array, both the length of the modified section and the distance from the array are increased by an integral number of half wavelengths. Matching at two different frequencies in the band is thereby achieved, and hence approximately over the whole frequency band. The matching may be considerably simplified in some cases by the use of a subsidiary matching section of conventional design.
It is proposed to carry out a practical test of the method at a short wave transmitting station.
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