Millimeter wave quadrature coupler with arbitrary coupling factor and its design method

Abstract

The invention discloses a millimeter-wave orthocoupler based on chip units and with arbitrary coupling factors and a design method thereof. The millimeter-wave orthocoupler comprises four 90-degree sector microstrip chip units linked with one another, four port lines, a plurality of metalized vias distributed in the edges of the chip units, a dielectric substrate and a metal ground. Four 90-degree sector microstrip chip units with the edges loaded of metalized vias, four pore lines, the dielectric substrates and the metal ground are used to form the dielectric integrated waveguide coupler based on the chip units; opposite sectors of the 90-degee sector microstrip chip units are equal in radius, adjacent sectors are unequal in radius, the different radius ratios lead to different coupling factors; the positions of the port lines 90 degrees spaced along the centers of the chip units are used to implement the phase orthogonal function of the orthocoupler. The millimeter-wave orthocoupler is widely applicable to systems such as modems, power amplifiers, balance mixers, system power detection, and amplitude control circuits of multi-beam antenna arrays.

Description

technical field [0001] The invention relates to a coupler used in microwave and millimeter-wave communications, in particular to a millimeter-wave orthogonal coupler with arbitrary coupling factors between output ports based on a chip unit, and a design method of the coupler. Background technique [0002] The coupler is a directional power distribution element, which can distribute the power to the coupling end in different proportions from the forward wave of the main transmission system. Couplers are used in power gain control devices, balanced amplifiers, modulation and demodulation circuits, and feeder networks for phased array radar systems. For a long time, there have been extensive researches on how to improve the 3dB operating bandwidth of the coupler and how to reduce the circuit size, but there are relatively few studies on the quadrature coupler with arbitrary coupling coefficients operating in the mm-wave band . [0003] In fact, quadrature couplers with arbitr...

AI Technical Summary

Problems solved by technology

Traditional metal waveguide devices are expensive and difficult to maintain due to their large size and complex processing and debugging processes.

Due to the serious leakage and radiation of electromagnetic waves in the microstrip circuit and early integrated circuits, the insertion loss of the circuit is large, Q The value is relatively low, and its circuit size is also small, which requires high processing accuracy and high cost

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