Parallel Signal Line Filter Circuit for Millimeter-Wave Rejection
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Solution Overview
Problem
In mobile communication systems, particularly those using both sub-6 GHz and millimeter-wave bands, there is a challenge of mutual interference (self-interference) between communication units, leading to the need for a filter circuit that effectively rejects millimeter-wave signals without increasing device size, which is a constraint in small communication devices like smartphones.
Innovation Solution
A filter circuit configuration featuring a first signal line extending longitudinally and a second signal line extending in parallel, with one end connected and the other open, is used to block specific frequencies, allowing for effective frequency rejection while minimizing space occupancy by adjusting the length and width of the signal lines to achieve optimal electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter circuit is mounted to reject millimeter-wave band signals, then frequency rejection characteristic is improved, but device size increases
Solution Approach 1:
The filter circuit is integrated within the existing communication device structure by nesting the second signal line (filter element) alongside the first signal line (transmission line) in a compact arrangement. The filter circuit shares space with the transmission path, effectively nesting the filtering function within the existing signal transmission infrastructure, thereby achieving frequency rejection without proportionally increasing device size
Solution Approach 2:
The filter circuit utilizes the spatial dimension by arranging the second signal line in parallel with the first signal line in a planar configuration. By extending the filter element along the length of the transmission line rather than placing it as a separate component, the design transforms the filtering function into a distributed structure that occupies minimal additional area while maintaining effective frequency rejection
2Object-affected harmful factors
If conventional filter circuits are used to block millimeter-wave signals, then interference rejection is improved, but mounting space requirement increases
Solution Approach 1:
The filter circuit merges the filtering function with the transmission line structure itself. The second signal line is electrically connected to the first signal line at one end while remaining open at the other end, creating a combined structure that performs both signal transmission and frequency filtering in a single integrated configuration, thereby reducing the need for separate filter components and mounting space
Solution Approach 2:
The first signal line serves dual functions: it acts as both the transmission path for radio signals and as part of the filter circuit structure. The second signal line, when connected to the first, provides frequency rejection while the overall configuration maintains signal transmission capability, making the structure multi-functional and space-efficient
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 proposed filter circuit achieves a good frequency rejection characteristic in the millimeter-wave band, outperforming conventional filters and maintaining a compact size, suitable for small communication devices like smartphones.
Implementation Method 1
a length in the longitudinal direction that is determined according to a frequency of a signal to be blocked of signals transmitted through the first signal line
Data Source
AI summary
To achieve a filter circuit that is configured to have a good frequency rejection characteristic and suppress an increase in size due to mounting, in a more preferred aspect.A filter circuit includes a first signal line that is arranged to extend longitudinally, and a second signal line that is arranged to extend in parallel with the first signal line, in which the second signal line has one end that is electrically connected to the first signal line, and the other end that is open, in a longitudinal direction, and a length in the longitudinal direction that is determined according to a frequency of a signal to be blocked of signals transmitted through the first signal line.