High-selectivity broadband LTCC filtering power divider integrated chip

Abstract

The invention discloses a high-selectivity broadband LTCC (Low Temperature Co-Fired Ceramic) filtering power divider integrated chip which integrates a band-pass filtering function and a power distribution function and solves many negative problems brought by a traditional scheme of cascading a filter and a power divider. The filtering power divider is composed of capacitors C1, C2, C3 and C4, inductors L1, L2, L3 and L4 and an isolation resistor R. The improved n-type impedance conversion circuit is composed of a grounding capacitor C1, a series inductor L1 and a parallel L2C2 resonator. The series-parallel capacitance inductance resonator is composed of C3, C4, L3 and L4. The high-selectivity broadband LTCC filtering power divider integrated chip provided by the invention has the advantages of wide passband, high selectivity, ultra-wide higher harmonic suppression, full-band isolation and ultra-low insertion loss in the aspect of circuit performance, and is an ultra-miniaturized broadband high-selectivity filtering power divider integrated chip suitable for a 5G communication system.

Description

technical field [0001] The invention belongs to the technical field of microwave transmission and integrated circuits, and relates to a passive radio frequency filter power divider chip, in particular to a high-selectivity broadband LTCC filter power divider integrated chip. Background technique [0002] With the explosive development of the fifth-generation mobile communication system (referred to as "5G"), the RF front-end module in the communication system is developing in the direction of miniaturization, high integration, broadband, and functional integration. [0003] As a power divider (hereinafter referred to as a power divider) widely used in RF front-end modules, its function is to divide the power of an input signal into two (or multiple) signal outputs through the power divider. The application scenarios of the power divider are very rich, for example, the signal power generated by the signal generator is sent to multiple radiation units of the transceiver antenn...

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Problems solved by technology

[0004] Filters are also widely used as frequency selective devices. In traditional radio frequency circuits, power dividers cannot effectively filter power signals according to frequency. Therefore, power dividers and filters are often cascaded in a 50-ohm microstrip line. Realize the selection of power distribution signals. However, this method has many disadvantages such as large circuit size, low integration, large insertion loss, poor port matching and poor frequency selectivity.

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