Open-Structure Microstrip Mixer for Compact Doppler Module
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Solution Overview
Problem
Conventional microwave-doppler detecting modules with integral microstrip mixers face challenges in miniaturization due to the rigid frame-shaped structure of the microstrip balanced mixer, which limits the flexibility in designing smaller circuits and increases design complexity.
Innovation Solution
A microstrip mixer with an open structure having three ports is introduced, allowing for flexible design and reduced size, featuring a shared port for feedback and local oscillator signals, and phase differences between ports to enhance sensitivity and reduce the length of the microstrip mixing line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional frame-shaped microstrip balanced mixer structure is used, then the mixer can achieve balanced mixing function, but the structure size is large and the design flexibility is limited
Solution Approach 1:
The conventional frame-shaped microstrip balanced mixer structure is segmented into two separate three-port microstrip mixers. Each mixer has an open structure with three ports instead of the rigid four-port frame structure. This segmentation allows each mixer to be independently designed and positioned, significantly increasing design flexibility while reducing the overall area occupied by the mixing circuitry.
Solution Approach 2:
The invention transitions from a two-dimensional frame structure to a three-dimensional spatial arrangement by using multiple three-port mixers positioned at different locations. The local oscillator signal is distributed to multiple mixers through microstrip lines, and the intermediate frequency signals are combined from these mixers. This dimensional change enables more flexible layout and reduces the area requirement compared to the conventional frame structure.
2Reliability
If the microstrip mixing line length is increased to achieve proper signal phase relationships, then the mixing function is improved, but the overall device size increases
Solution Approach 1:
Multiple three-port microstrip mixers are merged into a single functional unit that performs the balanced mixing function. By combining the output signals from multiple mixers, the invention achieves proper signal phase relationships and improves the mixing function without requiring excessively long microstrip lines within each individual mixer. The distributed architecture allows for more reasonable line length distribution.
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 open structure design enables a more compact and flexible microstrip mixer, reducing the size of the microwave-doppler detecting module while improving sensitivity by maximizing the amplitude of the intermediate-frequency signal.
Implementation Method 1
the mixer is utilized to receive the feedback signal and to output an intermediate-frequency signal corresponding to the frequency difference between the local oscillator signal and the feedback signal
Implementation Method 2
based on Doppler Effect, the intermediate-frequency signal is corresponding to the movement of the corresponding object that reflects the sounding wave beam and forms the echo
Data Source
AI summary
A microstrip mixer of a microwave-doppler detecting module has a shared port, a local oscillator signal input port and a mixing output port and includes two mixer tubes. The local oscillator signal input port is electrically connected with the shared port and is electrically connected with an end of one of the mixer tubes through the shared port. The local oscillator signal input port is also electrically connected with the mixing output port and is electrically connected with an end of the other mixer tube through the mixing output port. The other ends of the two mixer tubes are respectively grounded. Accordingly, the microstrip mixer is configured to have an open structure having three ports, which is more flexible and enhances the applicability thereof while reducing the size of the microwave-doppler detecting module utilizing the microstrip mixer.