Filters, integrated passive devices, electronic devices and display devices

By designing a combination of multiple bandpass filter circuits and utilizing high-Q inductors and ultra-thin capacitors, the problems of poor high-frequency signal filtering characteristics and low integration of traditional filters are solved. This achieves miniaturization and effective filtering of high-frequency signals, and features multiple transmission zeros, large bandwidth, and high out-of-band rejection characteristics.

CN119731938BActive Publication Date: 2026-06-30BOE TECHNOLOGY GROUP CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BOE TECHNOLOGY GROUP CO LTD
Filing Date
2023-02-17
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Traditional filters have poor filtering characteristics for high-frequency signals and low integration, making them unable to meet the requirements of miniaturization and high-frequency signals. In particular, they are difficult to achieve the characteristics of large bandwidth, low loss and high out-of-band rejection in 5G technology.

Method used

A filter comprising multiple bandpass filter circuits was designed. By combining inductors and capacitors, multiple transmission zeros are formed to improve out-of-band rejection. High-Q inductors and ultra-thin, small-sized capacitors are used to achieve low insertion loss in the passband and rapid attenuation at the band edge.

Benefits of technology

It achieves the goals of miniaturization and low cost of filters, and features multiple transmission zeros, large bandwidth, high roll-off characteristics and high out-of-band rejection, making it suitable for high-frequency signal filtering.

✦ Generated by Eureka AI based on patent content.

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Abstract

This disclosure provides a filter, an integrated passive device, an electronic device, and a display device. The filter includes: a first port, a second port, a first bandpass filter circuit, a second bandpass filter circuit, and a third bandpass filter circuit. The first bandpass filter circuit is configured to suppress a signal with a frequency between a first frequency and a second frequency in the initial signal input to the first port and output a first signal. The second bandpass filter circuit is configured to receive the first signal and output a second signal with a frequency between a third frequency and a fourth frequency in the first signal. The third bandpass filter circuit is configured to receive the second signal and output a third signal with a frequency between a fifth frequency and a sixth frequency in the second signal to the second port. The first frequency is less than the second frequency; the third frequency is between the first frequency and the second frequency; and the fifth frequency is between the third frequency and the second frequency.
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