Compact UWB Bandpass Filter Layout for Shorter Installation Length
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Solution Overview
Problem
Existing UWB band pass filters are unsuitable for certain applications due to their long and narrow design, which results in an excessive installation length.
Innovation Solution
The first line sections and stubs are arranged in parallel, with a 90° rotation, and the stubs branch off in alternating directions, while the second line sections extend at a right angle, embedded between dielectric layers with ground layers connected via feedthroughs for enhanced irradiation and radiation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter structure uses traditional microstrip technology with line sections and stubs arranged in series, then the filter achieves the required bandpass characteristic, but the circuit board becomes long and narrow with excessive installation length
Solution Approach 1:
The patent transforms the traditional series arrangement of line sections and stubs into a parallel configuration. The first and second line sections are arranged parallel to each other, with stubs branching off in alternating directions (first direction and second direction). This dimensional reorganization converts the long narrow layout into a more compact form factor while preserving the filter's electrical characteristics
Solution Approach 2:
The patent employs asymmetric arrangement where stubs branch off in alternating first and second directions from the parallel line sections. This asymmetric configuration optimizes the filter performance while achieving compactness, breaking the symmetry of traditional microstrip designs to resolve the contradiction between filter characteristic and installation length
2Object-generated harmful factors
If the stubs branch off in alternating directions from the line sections, then parasitic coupling is reduced, but the filter structure complexity increases
Solution Approach 1:
The patent divides the filter structure into distinct segments: first line sections, second line sections, and multiple stubs arranged in alternating directions. This segmentation allows each component to be optimized independently for reducing parasitic coupling while maintaining overall structural manageability. The alternating direction arrangement of stubs creates spatial separation that minimizes parasitic effects
Data Source
AI summary
A UWB band pass filter that is formed by a circuit board. The circuit board includes a first dielectric layer made of a dielectric substrate, a filter structure made of electrically conductive material, on a first side of the first dielectric layer, a first ground layer made of electrically conductive material, on a second side of the first dielectric layer. The filter structure has an input terminal and an output terminal between which a line extends that includes multiple first line sections and second line sections, and wherein the filter structure has multiple stubs that are situated between the first line sections and that branch off from the second line sections. The first line sections and the stubs are situated in parallel. The longitudinal line of the middle first line sections is inserted, from which two open stubs that are rotationally symmetrical about the middle first line sections branch off.