H - Electricity – 01 – P
Patent
H - Electricity
01
P
333/4
H01P 5/16 (2006.01) H01P 1/18 (2006.01) H03H 7/48 (2006.01) H04N 5/38 (2006.01)
Patent
CA 1228898
ABSTRACT A television broadcast transmitter includes two power amplifiers or transmitters, a dummy load and an antenna. A noncontacting switching arrangement includes 3dB directional couplers or hybrids operated as controllable phase-shifters under the control of pairs of variable reactive terminations. The signals arriving at the antenna or load port by two paths are combined in-phase to couple signal to that port, or combined out-of-phase to cancel signal at that port. If the out-of-phase condition is not accurate, the cancellation may be incomplete, resulting in crosstalk. In order to avoid the need for highly accurate positioners to position the variable reactive termination at the particular position providing the desired phase-shift, a particular structure of the reactive termination is used. The reactive termination is a short-circuited coaxial line with an axial gap in the center conductor at a position less than one quarter wavelength from the short circuit. The center conductor is hollow in the region of the gap and lined with insulating material, and an elongated conductive slug is actuated to selectively occupy one of two positions within the hollow center conductor, one position remote from the gap whereby a minimum series capacitance results, and the second position straddling the gap, whereby the series capacitance increases. The slug is actuated by a dielectric rod passing through the short circuit. The rate of change of phase-shift as a function of actuator positions is very small near the extremes of actuation position, whereby small errors in actuator position do not materially affect the phase-shift.
479187
Clark Raymond N.
Schmitz Anthony N.
Borden Ladner Gervais Llp
Sola Basic Industries Inc.
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