Abstract: A multibeam antenna reflector having a reflection surface expressed by a combination of at least first and second corrected surface functions which are individually corrected so that they can have a large beam deviation angle. The respective corrected surface functions are combined together by being weighted and averaged with each other.

Abstract: A signal level measuring apparatus measures a level of a satellite signal from a geostationary satellite as received by a receiving antenna and provides an output to determine whether the antenna is correctly directed to the satellite. The apparatus is disposed between a converter associated with the antenna for converting the satellite signal into an IF signal and a tuner for demodulating the IF signal. The apparatus distributes and divides the IF signal from an input terminal of the apparatus into two output signals. One of the output signals is coupled to an output terminal of the apparatus, which, in turn, is coupled to the tuner. The other output signal is applied to level detector. An output from the level detector is compared with a reference signal. Depending on the comparison output, the state of light emission of a light-emitting device varies.

Abstract: A device for rotating a parabolic antenna (10) by an actuator (20) to enable reception of electric waves transmitted from a plurality of satellites with the antenna (10). A data for rotating the antenna (10) to enable reception from each satellite at a predetermined receiving position is stored in a ROM (24). A CPU 22 sets the antenna (10) in a position corresponding to the data in the ROM (24) for each satellite different initial receiving from the former for each satellite. From this state, the antenna (10) is moved east and west to detect disappearance of a synchronizing signal which is part of a signal from a tuner (18) by a synchronizing signal detector (50), and the midpoint of the positions of disappearance of the synchronizing signal in the east and west is stored in a RAM (26) as a position of the best receiving condition. The data in the RAM (26) is read out by a control unit (36) and the position of the antenna (10) is changed correspondingly.

Abstract: A microstrip line antenna generally used for receiving an electric wave from an artificial satellite, which comprises a plane dielectric substrate and a plurality of crank-shaped microstrip lines arranged on the substrate. The improvement comprises a number of half wavelength waveguide elements arranged on a plane lying parallel to the substrate in front of the microstrip lines at a predetermined distance therefrom for improving the signal-to-noise ratio of the antenna and reducing the number of antenna elements.

Abstract: A high frequency coaxial line coupling device which is insertable along the length of a coaxial line such as that which connects a rotary antenna carried on a moving body such as vehicle or vessel to receive a signal from a communication or broadcast satellite, with a receiver component such as tuner fixed to the moving body, for the purpose of allowing free relative rotation of the two segments of the coaxial line separated by the coupling device and preventing twist or entanglement of the coaxial line caused by rotation of the antenna with turning movement of the moving body. The device structure provides for a low transmission loss characteristic over a wide frequency range.

Abstract: An improved high frequency signal changeover switch is provided for use especially as a horizontal-vertical selection switch in an artificial satellite broadcast receiving system for the purpose of selectively delivering either vertical or horizontal polarization signals received at its two inputs, respectively, from its single output. This inventive switch has such a significant feature over the prior art switches in that no mismatch occurs among all of these terminals.

Abstract: A transmission line device for coupling two radio waves, such as horizontal and vertical polarized waves such as satellite transmissions, which are traveling in a particular direction along a pair of main transmission lines, selectively to a branch line without problem of mismatch, wherein the branch line is composed of a single feeder and selection of the two waves is effected simply by applying a positive or negative voltage to the feeder.

Abstract: A satellite broadcast signal receiving system for receiving a plurality of signals of individual transmission bands, which are mutually different in frequency and/or polarization angle, transmitted through an artificial satellite, wherein the signals picked up by an antenna or antennas are first applied to a plurality of outdoor units each corresponding to one transmission band and comprising a convertor for converting the incoming signal into an IF signal, and the converted IF signals are then applied through a change-over switch to a common indoor unit including a demodulator to be demodulated for application to a conventional television set or the like.