DIRECTIONAL COUPLER AND ANTENNA

The present description relates to the technical field of radio frequency. Provided are a directional coupler and an antenna. The directional coupler comprises: a first coupling line and a second coupling line, wherein the electrical length of a coupling section between the first coupling line and the second coupling line is greater than λc/4, λc being a wavelength corresponding to a central frequency. In the solution, by means of increasing the electrical length of coupling sections in existing parallel-line directional couplers, a mismatch of a circuit in a higher frequency band within an operating range occurs, such that the energy of a coupling port is reduced with frequency. The directional coupler is applied to a feeder network of a low-frequency 4T4R antenna and optimizes a horizontal-plane 3dB beamwidth to 60-69° from 65-86°, such that the horizontal-plane 3dB beamwidth can be effectively reduced and converged. The directional coupler provided in the present description achieves a variable power ratio