3dB quadrature hybrid coupler, radio frequency front-end module and communication terminal

Abstract

The invention discloses a 3dB quadrature hybrid coupler, a radio frequency front-end module and a communication terminal. The 3dB quadrature hybrid coupler can be arranged on a substrate. A straight-through metal coil and a coupling metal coil adopt a laminated structure, a coplanar structure or a combined form of the laminated structure and the coplanar structure, so that the corresponding radiofrequency signal input port is connected with a first radio frequency signal output port, and an isolation port is connected with a second radio frequency signal output port. Meanwhile, according to the requirements of the working frequency and the port characteristic impedance of the 3dB quadrature hybrid coupler, the number of turns and the number of layers of the straight-through metal coil andthe coupling metal coil are adjusted, so that the insertion loss of the coupler is reduced, and the radio frequency performance such as the port reflection coefficient and the port isolation degree of the 3dB quadrature hybrid coupler is optimized. By utilizing the radio frequency front-end module, the chip area can be effectively saved, and the design cost of the radio frequency front-end moduleis reduced.

Description

technical field [0001] The invention relates to a 3dB quadrature hybrid coupler, and also relates to a radio frequency front-end module including the 3dB quadrature hybrid coupler and a corresponding communication terminal. Background technique [0002] The 3dB quadrature hybrid coupler is a commonly used four-port device that can equally divide the input signal while maintaining high isolation between the ports, and generate a 90° phase shift between the two output signals, or maintain a high isolation between the ports. Simultaneously combine two input signals with a phase difference of 90° with high isolation. [0003] Such as figure 1 As shown, a 3dB quadrature hybrid coupler in the prior art includes two crossed quarter-wavelength transmission lines. Ideally, when an RF signal is input to the RF signal input port, half of the RF signal (equivalent to 3dB) goes straight to the RF signal output 1 (phase is 0°) port, and the other half of the RF signal is coupled to the ...

AI Technical Summary

Problems solved by technology

If you want to achieve better radio frequency performance, 3dB quadrature hybrid couplers are generally implemented on chips, but limited by the low Q value of passive devices on the chip, the insertion loss of 3dB quadrature hybrid couplers is relatively large

In addition, because chips manufactured by some processes only provide a single layer or two layers of metal with different thicknesses, the ports of the 3dB quadrature hybrid coupler have problems of impedance mismatch and poor isolation.

In addition, designing a 3dB quadrature hybrid coupler on the chip will occupy a large chip area, thereby increasing the design cost of the RF front-end module

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