Curved Microstrip Resonator Bandpass Filter for Compact Mobile Integration
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Solution Overview
Problem
Conventional bandpass filters occupy a large area, which is a challenge for integration into slim and lightweight mobile electronic devices.
Innovation Solution
A micro bandpass filter design featuring a substrate with L-shaped and linear microstrip lines and resonators, which are curved to reduce the overall area while maintaining signal transmission and filtering functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional bandpass filter design with straight resonators is used, then signal transmission and filtering functionality are achieved, but the filter occupies a large area
Solution Approach 1:
The patent applies curvature by replacing straight resonator lines with meandering (curved) microstrip lines. The first and second resonators use meandering microstrip lines that extend in a curved path between the input and output ports, reducing the linear footprint while maintaining the electrical length required for resonance. This allows the filter to achieve the desired frequency response in a compact area.
Solution Approach 2:
The patent utilizes the planar two-dimensional space more efficiently by arranging resonators in a layered configuration with different orientations. The first resonator extends primarily in one direction while the second resonator extends in a different direction, allowing both resonators to coexist in a compact area without significant interference, thus reducing the overall filter footprint.
2Reliability
If resonator width is increased to improve signal transmission, then filtering performance is enhanced, but the filter area increases
Solution Approach 1:
By using meandering microstrip lines with optimized curvature and spacing, the patent achieves the required electrical length and resonance characteristics without increasing the linear width of the resonators. The curved path provides sufficient electrical length for filtering performance while keeping the physical width compact.
Solution Approach 2:
The patent optimizes parameters such as microstrip line width, spacing between lines, and meander pattern geometry to achieve the desired filtering performance. By carefully adjusting these parameters, the filter maintains effective signal transmission and noise rejection while minimizing the overall area occupied by the resonators.
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 micro bandpass filter achieves the desired central frequency and bandwidth in a smaller area, allowing for compact integration in mobile devices, with adjustable dimensions to optimize frequency and bandwidth performance.
Implementation Method 1
a first resonator, a second resonator, a third resonator and a fourth resonator. A signal received by the first resonator is transmitted along the following two paths: in a first path, the signal is resonated by the first resonator and the second resonator
Data Source
AI summary
A micro bandpass filter comprises a substrate, a first signal transmission member, a second signal transmission member and a resonator structure. The resonator structure includes a plurality of microstrip lines. The present invention realizes the function of a bandpass filter in a smaller area via curving the first signal transmission member, the second signal transmission member and the resonator structure.