Abstract: A receiving device of a dual polarization transmission system includes: a receiver that receives an RF signal that is transmitted with the use of two orthogonal polarizations; two reception local oscillators that include PPL circuits to convert the received RF signal of each of the polarizations into an IF signal; and a demodulator that demodulates an IF signal of one polarization, which is obtained by the conversion, into a baseband signal. The reception local oscillators control a loop band of the PLL circuits in response to a signal from the demodulator.

Abstract: A receiving device of a dual polarization transmission system includes: a receiver that receives an RF signal that is transmitted with the use of two orthogonal polarizations; two reception local oscillators that include PPL circuits to convert the received RF signal of each of the polarizations into an IF signal; and a demodulator that demodulates an IF signal of one polarization, which is obtained by the conversion, into a baseband signal. The reception local oscillators control a loop band of the PLL circuits in response to a signal from the demodulator.

Abstract: A transducer is connected between a wave-guide tube and a microstrip line, has an antenna probe formed on a multi-layered insulating structure over the opening of the wave-guide tube and connected between the microstrip line and a ground plane, and an inter-level conductive pattern is formed around the zone over the opening so that the zone propagates electromagnetic wave between the wave-guide tube and the microstrip line without undesirable electromagnetic influences from a semiconductor bare chip mounted on the multi-layered insulating structure.