Antenna matching circuit

摘要

An antenna matching circuit includes at least two signal paths are connected to one antenna connection. The signal paths are designed to transmit and/or receive RF signals. A matching circuit includes a discrete line for phase shifting integrated at the antenna end in at least one of the signal paths. In this case, at least one of the capacitances contained in the discrete line is in the form of a micro-acoustic resonator, whose resonance is shifted sufficiently far that it is outside the pass band of the respective signal paths.

主权项

1. An antenna matching circuit comprising:
an antenna connection to be connected to an antenna; at least two signal paths coupled to the antenna connection, each of the at least two signal paths having one pass band for transmission and/or reception of an RF signal; a matching circuit comprising a discrete line for phase shifting of the RF signal in a segment of each of the at least two signal paths integrated at an antenna end, wherein the matching circuit is configured to perform an impedance transformation, wherein the discrete line forms a π circuit that comprises a serial inductance and parallel capacitances, wherein the parallel capacitances comprise micro-acoustic resonators whose resonance is outside the pass band of one of the at least two signal paths; and filter circuits in the at least two signal paths, wherein the filter circuits comprise filter resonators, wherein all the resonators in the filter circuits and all the micro-acoustic resonators in the matching circuit are disposed on a common chip, wherein the micro-acoustic resonators in the matching circuit have a design based on the design of the resonators in the filter circuits, and wherein at least one of the filter resonators and at least one of the micro-acoustic resonators are cascaded.