Transmitter-receiver

Abstract

Abstract PURPOSE:To obtain a transmitter-receiver whose local oscillator source is simply constituted by providing a transmission frequency converter for transmission reception and a transmission frequency converter for reception respectively in duplicate, providing one local oscillator for a local oscillation source, and selecting the frequency of the local oscillation source to be a half the frequency difference between the transmission frequency and the reception frequency. CONSTITUTION:A 1st transmission IF signal (frequency FT) inputted to a signal input terminal 1 is frequency-converted into a 2nd transmission IF signal (frequency FL1) by a 1st transmission frequency converter 9 and a local oscillator 10 (frequency FL1). A multiplier 12 whose multiplier is N/M (output frequency fL2) frequency-converts the 2nd transmission IF signal into a transmission RF signal (frequency FT). A reception RF signal (frequency FR) is inputted to a 2nd reception frequency converter 13 via an antenna 5 and a circulator 4 and frequency-converted into a 2nd reception IF signal (frequency FR2). The local oscillation source of a 2nd reception frequency converter 13 is an output signal of the multiplier 12. Thus, the oscillation is used in common and the frequency of the oscillator is lowered, then the constitution of the oscillator is simplified, and easily realized and the entire transmitter-receiver is easily realized.

Inventors

• 👤 Hiroshi Saka
• 👤 阪　博

Bibliographic Details