Microstrip Band-Pass Filter with Nested Trapezoidal Coupling
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Solution Overview
Problem
Designing a band-pass filter with a small footprint while maintaining performance is challenging for developers, particularly in the context of 5 GHz mobile communication technology.
Innovation Solution
A band-pass filter configuration on a printed circuit board featuring a first and second terminal, first and second coupling portions, and a connection portion, where the terminals are partly accommodated in grooves within the coupling portions, allowing for efficient signal coupling and transmission, and occupying a small area of 4.7 mm by 4.7 mm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the band-pass filter uses conventional design structures, then the signal transmission performance can be maintained, but the occupied area will be large
Solution Approach 1:
The terminal structures are nested within grooves formed by the coupling portions, with the first terminal partially accommodated in the first coupling portion groove and the second terminal partially accommodated in the second coupling portion groove. This nesting arrangement allows the filter to achieve a compact 4.7mm x 4.7mm footprint while maintaining proper signal coupling and transmission performance through the trapezoidal-shaped coupling structures.
2Area of stationary object
If the band-pass filter is miniaturized to reduce occupied area, then the footprint is reduced, but the signal coupling performance may deteriorate
Solution Approach 1:
The coupling portions are designed with specific trapezoidal shapes that concentrate the coupling function in localized regions. The first coupling portion and second coupling portion each have grooves with specific geometries that optimize signal coupling locally, allowing the overall filter to be miniaturized to 4.7mm x 4.7mm while maintaining effective signal transmission through these specialized local coupling structures.
Data Source
AI summary
A band-PASS filter disposed on a printed circuit board comprises a first terminal, a second terminal, a first coupling portion, a second coupling portion and a connection portion. The first terminal and the second terminal are used to receive or output electromagnetic signals respectively. The first coupling portion and the second coupling portion are disposed between the first terminal and the second terminal to couple the electromagnetic signals. The connection portion is connected to the first coupling portion and the second coupling portion. The first terminal partly accommodates in a first coupling portion groove. The second terminal partly accommodates in a second coupling portion groove.