Lumped-parameter wideband 180-degree coupler with harmonic suppression function

Abstract

The invention relates to a lumped-parameter wideband 180-degree coupler with a harmonic suppression function. The lumped-parameter wideband 180-degree coupler comprises seven capacitors and four inductors, wherein the seven capacitors are connected with three inductors so as to form double loops. Capacitor-inductor pairs are adopted to form resonance units so as to provide transmission zeros, such that the harmonic suppression function can be realized; a first connection point is connected with a first port; a second connection point is connected with a second port; a fourth connection point is connected with a third port; and a third connection point is grounded through one inductor, and therefore, secondary inductive coupling can be realized, and the operating bandwidth of the coupler can be expanded. The lumped-parameter wideband 180-degree coupler of the invention is advantageous in fewer used components, small occupied area and low implementation cost; and the lumped-parameter wideband 180-degree coupler can keep excellent output amplitude balance and phase balance in a very wide frequency range, and has factorable harmonic suppression ability, and is suitable for being used in existing handheld mobile radio frequency wireless communication systems.

Description

technical field [0001] The invention relates to the technical field of communication circuit components, in particular to a broadband 180-degree coupler with a lumped parameter and a harmonic suppression function. Background technique [0002] In modern communication systems, 180-degree couplers are often used in radio frequency and microwave millimeter wave circuits, such as balanced amplifiers, image rejection mixers, balanced frequency multipliers, etc. Especially in today's mobile electronic communication market, with the development of multi-band and multi-mode technology, radio frequency transceivers that can simultaneously meet various frequency bands and communication standards have become the current development direction . [0003] As an important device in the transceiver system, the demand for broadband 180-degree couplers is constantly increasing. Most of the traditional 180-degree couplers currently popular use microstrip structures, such as Marchand baluns, ...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a broadband 180-degree coupler with a harmonic suppression function of lumped parameters, which uses a small number of components, occupies a small area, has a wide operating frequency band, and has harmonic suppression capabilities, thereby solving the current 180-degree coupler. High-degree coupler footprint, poor bandwidth and harmonic suppression performance, and high price technical issues

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