Forward and Reflected Powers. What Do They （向前,反映了权力。）.pdfVIP

WHITEPAPER By Richard A. Scholl of Advanced Energy Industries, Inc. FORWARD AND REFLECTED POWERS. Measurements made in the RF domain are steeped in tradition. Like most WHAT DO THEY MEAN? traditions, RF concepts are passed on by word of mouth as well as by written legend. Also like most traditions, the concepts are imperfectly understood by many who need to know better. In particular, the concept of reflected power is often misunderstood. Most users have the impression that its presence is bad and so it should be minimized. This paper is intended to help understanding and to dispel myths surrounding RF measurements and practice. ORIGINS directional wattmeter, The use of radio frequencies in the first half and more of which he can place at this century was centered on radio communication, as the any convenient point in very name implies. In a radio station, power is generated by the cable. This device a transmitter, usually housed comfortably in a shack, and the measures the voltage, RF power is led to the (usually) remote antenna by a cable, or current, and their relative transmission line, which in short wave stations can be several phase. It reports on its dials wavelengths long. An antenna tuner is generally placed at quantities called forward power the antenna end of this line. The function of this circuit and reflected power. Where do is to match the antenna, which means that t