Integrated Band-Pass Filter Layout for High-Frequency Miniaturization
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Solution Overview
Problem
Existing filters, particularly LC filters, have low integration, large size, and poor filtering characteristics for high-frequency signals, hindering miniaturization and performance in communication systems, especially in the 5G era.
Innovation Solution
A filter design comprising multiple band-pass filter circuits with specific frequency ranges and connections between capacitors and inductors, including multilayer and single-turn inductors, and ultra-thin capacitors, to achieve low insertion loss, multiple transmission zeros, and improved out-of-band suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional LC filters are used, then the filtering function is achieved, but the device size is large and the degree of integration is low
Solution Approach 1:
The patent combines multiple band-pass filter circuits into a single integrated filter device, merging multiple filtering functions into one compact unit. This reduces the overall device volume while maintaining high integration, directly resolving the contradiction between small size and integration complexity.
Solution Approach 2:
The patent transitions from traditional planar LC filter layouts to a three-dimensional integrated structure with multiple stacked layers. This dimensional change enables higher integration density within a smaller volume, effectively resolving the size-integration contradiction.
2Reliability
If traditional LC filters are used, then the filtering function is achieved, but the filtering characteristics for high-frequency signals are poor
Solution Approach 1:
The patent changes the fundamental circuit parameters by using multiple band-pass filter circuits with different center frequencies and bandwidths instead of a single LC resonant circuit. This parameter diversification enables effective filtering across high-frequency ranges while maintaining reliable filtering characteristics, resolving the contradiction between reliability and high-frequency adaptability.
3Reliability
If multiple band-pass filter circuits are integrated, then the transmission zeros increase and out-of-band suppression improves, but the device complexity increases
Solution Approach 1:
The patent divides the filter into multiple independent band-pass filter circuit modules, each responsible for specific frequency ranges. This segmentation allows each module to be optimized independently for high out-of-band suppression while keeping individual module complexities manageable, resolving the contradiction between reliability and overall device complexity.
Solution Approach 2:
The patent designs the band-pass filter circuits with universal structural characteristics that can be replicated and stacked. Each circuit module serves multiple functions: filtering specific bands, creating transmission zeros, and providing out-of-band suppression. This multi-functionality reduces the complexity increase that would result from adding separate components for each function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The filter achieves miniaturization, high roll-off characteristics, and effective out-of-band suppression, supporting high-frequency signal filtering with reduced device size and improved performance.
Implementation Method 1
the first band-pass filter circuit is connected with the first port and configured to input a first signal with a frequency between a first frequency and a second frequency in an initial signal input from the first port to the second band-pass filter circuit
Implementation Method 2
the second band-pass filter circuit is connected with the first band-pass filter circuit and configured to: receive the first signal, and input a second signal with a frequency between a third frequency and a fourth frequency in the first signal to the third band-pass filter circuit
Implementation Method 3
the third band-pass filter circuit is connected with the second band-pass filter circuit and configured to: receive the second signal, and input a third signal with a frequency between a fifth frequency and a sixth frequency in the second signal to the second port
Data Source
AI summary
A filter, an integrated passive device and an electronic device are disclosed. The filter includes a first port, a second port, a first band-pass filter circuit, a second band-pass filter circuit, and a third band-pass filter circuit; the first band-pass filter circuit is configured to input a first signal with a frequency between a first frequency and a second frequency in an initial signal input from the first port to the second band-pass filter circuit; the second band-pass filter circuit is configured to receive the first signal, and input a second signal with a frequency between a third frequency and a fourth frequency in the first signal to third band-pass filter circuit; the third band-pass filter circuit is configured to receive the second signal, and input a third signal with a frequency between a fifth frequency and a sixth frequency in the second signal to the second port.