| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a 90-degree phase shifter and/or an orthogonal oscillator or the like for orthogonalizing I-axis and Q-axis to simplify a circuit while providing high precision and high-speed transmission. SOLUTION: In a transmission apparatus, a baseband signal Si is modulated into a modulated signal Sa by a BPSK modulation part 212. The modulated signal Sa is multiplied with a carrier signal Sc by a mixer 214, up-converted, and supplied to an input point 218. A baseband signal Sq is modulated into a modulated signal Sb by a BPSK modulation part 213. The modulated signal Sb is multiplied with the carrier signal Sc by a mixer 215, up-converted, and supplied to an input point 219. The input point 218 and input point 219 are set deviating each other by a distance of L1=(1/4+N)λ wavelength in carrier direction of a waveguide 220. This will cause a phase difference between the modulated signals Sa, Sb received by an output point 258 to deviate by λ/4 wavelength to provide an IQ orthogonal axis. COPYRIGHT: (C)2011,JPO&INPIT
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