Radar Detector Antenna Using Stubs for Single Power Supply
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Solution Overview
Problem
Radar detectors face challenges in accommodating multiple frequency bands with a single power supply unit, leading to increased size and complexity, while existing antennas either lack high gain and large bandwidth or are limited in size reduction.
Innovation Solution
The design includes multiple patch antennas connected through branches and stubs, allowing each antenna to operate independently with a single power supply unit, utilizing stubs to control signal progression and impedance, enabling operation across various frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas responding to different frequency bands are embedded, then the radar detector can detect various frequencies, but the size of the radar detector is increased and the number of power supply units is increased
Solution Approach 1:
The patent implements a single power supply unit that serves multiple patch antennas operating at different frequency bands (X-band, Ku-band, K-band, Ka-band). The power supply unit provides power to all antennas through a shared ground connection and impedance matching network, eliminating the need for separate power supply circuits for each antenna while maintaining full frequency band coverage
Solution Approach 2:
The patent combines multiple impedance matching networks into a unified structure where stubs are strategically placed to provide impedance matching for multiple frequency bands simultaneously. The ground connection structure is merged to serve all antennas, reducing the overall circuit complexity while maintaining individual antenna performance
2Reliability
If a horn antenna is used for high frequency radar detector, then high gain and large bandwidth are achieved, but the size and thickness of the radar detector cannot be minimized
Solution Approach 1:
The patent changes the antenna type from horn antenna to patch antenna, which has different physical characteristics. Patch antennas offer a smaller form factor and can be integrated into compact devices while maintaining adequate gain and bandwidth through proper design of the patch dimensions and substrate properties
Solution Approach 2:
The patent optimizes specific parameters of the patch antenna such as patch length, width, and substrate thickness to achieve the desired gain and bandwidth performance. By carefully controlling these local dimensions, the antenna achieves high frequency performance without requiring the large size of a horn antenna
3Volume of moving object
If a microstrip patch antenna is used to reduce size and thickness, then small size and small thickness are achieved, but gain and bandwidth are reduced
Solution Approach 1:
The patent divides the antenna system into multiple patch antennas, each optimized for a specific frequency band. By segmenting the frequency coverage across multiple specialized patches rather than using a single broadband antenna, each patch can be optimized for high gain in its specific band while maintaining compact size
Solution Approach 2:
The patent uses impedance matching stubs that extend in the vertical dimension to improve the gain and bandwidth of the patch antennas without increasing the horizontal footprint. The stubs provide additional degrees of freedom for impedance control and resonance enhancement while maintaining the compact planar structure
Data Source
AI summary
An antenna for a radar detector according to the present invention comprises: a power supply unit; first and second branches branched from the power supply unit; a first band patch antenna connected to the first branch and having first band properties; a second band patch antenna connected to the second branch and having second band properties; a second band stub placed between the power supply unit and the first band patch antenna on the first branch; and a first band stub placed between the power supply unit and the second band patch antenna on the second branch. The antenna for the radar detector according to the present invention may match one power supply unit without damaging the properties of a plurality of antennas that have different frequency properties.