A radio frequency transmitting circuit, bidirectional coupler and directional coupler

Abstract

The invention discloses a radio frequency transmitting circuit, comprising a radio frequency transmitter, an antenna switch and an antenna. A bidirectional coupler and an antenna tuner are arranged between the antenna switch and the antenna. The bidirectional coupler comprises a directional coupler and a switch, and forward or reverse transmission power is detected by switching the switch. The directional coupler is provided with a plurality of connected coupling lines, which are respectively located at any one or more positions of the upper side, the lower side, the outer side and the inner side of a main signal line. The bidirectional coupler is both used for detecting the transmitting power and is used for detecting the reflected power and outputting a detection value to the radio frequency transmitter. The radio frequency transmitter is both used for calibrating the transmitting power and is used for adjusting the input impedance of the antenna to realize the impedance matching of the antenna. The invention further discloses a bidirectional coupler, which has the advantages of simple structure, small volume, low cost, and easy integration with the manufacturing process of integrated circuits. The invention further discloses a directional coupler, which has high coupling degree and low insertion loss.

Description

technical field [0001] The present application relates to a radio frequency transmitting circuit, a bidirectional coupler constituting the radio frequency transmitting circuit, and a directional coupler constituting the bidirectional coupler. Background technique [0002] see figure 1 , which is a simplified schematic diagram of the existing RF transceiver circuit in mobile terminals such as mobile phones, which can be split into Figure 1a The RF transmitter circuit shown and Figure 1b The RF receiving circuit shown. Wherein, the radio frequency transceiver (transceiver) 11 can be replaced by an independent radio frequency transmitter (transmitter) 11a and radio frequency receiver (receiver) 11b, and the combination of radio frequency transmitter 11a and radio frequency receiver 11b can also be replaced by radio frequency transceiver 11. [0003] see Figure 1a , the signal direction of the radio frequency transmission circuit is: the radio frequency transmitter 11a ou...

AI Technical Summary

Problems solved by technology

[0019] The structure of the existing bidirectional coupler is relatively complex, which is not conducive to the manufacture and realization of semiconductor wafers (wafers) using integrated circuit manufacturing processes.

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