5G high-performance LTCC band-pass filter capable of inhibiting higher harmonics

Abstract

The invention discloses a LTCC band-pass filter, comprising a base body, an input end electrode, an output end electrode, a grounding end electrode and an internal circuit. The internal circuit comprises three parallel resonators, three coupling inductors, two connecting capacitors and a source-load coupling capacitor, and also comprises three grounding polar plates, and one grounding polar plateadopts a defected ground structure. Conductors of the inductors and the capacitor elements are printed on the surface of LTCC raw porcelain, and a filter is manufactured through the processes of punching, hole filling, screen printing, laminating and sintering. An internal circuit adopts an LTCC vertical interconnection structure, an inductor adopts a double-layer laminated structure, a capacitoradopts an MIM type capacitor, and the inductor and the capacitor are connected through a vertical through hole. The band-pass filter is small in size, low in production cost, capable of being producedin batches, high in performance reliability due to the fact that the passband reaches 1GHz, the in-band insertion loss is small, three transmission zero points are introduced, out-of-band rejection is high, and the low-stop-band sideband is steep, and a mirror symmetry structure is adopted.

Description

Technical field [0001] The invention relates to the technical field of filters, in particular to a 5G high-performance LTCC band-pass filter that suppresses higher harmonics. Background technique [0002] Microwave bandpass filter is a key component of microwave radio frequency system. With the development of microwave circuit design simulation technology and technology in recent years, the demand for miniaturization of radio frequency system is also increasing, and the miniaturization of filter is the first to bear the brunt. Therefore, how to reduce the size of the filter as much as possible while ensuring certain performance indicators has become an important problem that needs to be solved in miniaturized radio frequency systems. At the same time, with the rapid development of wireless communication systems, frequency resources are becoming increasingly tight. In order to suppress external signals and high-order harmonics generated by mixers, oscillators and other devices, an...

AI Technical Summary

Problems solved by technology

[0004] However, the frequency response of the traditional filter will produce a spurious passband when it is a certain distance away from the main passband (usually an integer multiple of the center frequency of the main passband), which is not suitable for applications that require harmonic suppression

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