Radar Apparatus Frequency-Selective Filter Scanning
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Solution Overview
Problem
Existing radar apparatuses using electronic scanning with variable impedance adjustment require multiple antennas, increasing the size of the apparatus.
Innovation Solution
A radar apparatus with a filter portion that includes multiple band transmission portions arranged along a scanning direction, allowing radio waves to be transmitted within specific frequency bands and changing frequencies to achieve scanning while reducing the number of antennas needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple antennas are used for electronic scanning with variable impedance adjustment, then high-speed beam scanning is enabled, but the radar apparatus size increases
Solution Approach 1:
The filter portion is segmented into multiple band transmission portions arranged along the scanning direction, each handling different frequency bands. This segmentation allows electronic scanning to be achieved through frequency selection rather than physical antenna switching, reducing the number of antennas needed while maintaining scanning capability
Solution Approach 2:
The invention changes the operating frequency parameter to achieve scanning. By sequentially changing the frequency of radio waves to match different band transmission portions, electronic scanning is accomplished without requiring multiple antennas, thus reducing apparatus size while maintaining scanning speed
2Adaptability or versatility
If multiple antennas are used for electronic scanning, then beam scanning capability is achieved, but the number of components increases
Solution Approach 1:
A single antenna is used to radiate radio waves across multiple frequency bands. The filter portion acts as a frequency-selective element that directs different frequency bands in different directions, making the single antenna perform the function that would otherwise require multiple antennas
Solution Approach 2:
The filter portion serves as an intermediary element between the single antenna and the scanning function. It receives radio waves from the antenna and selectively transmits different frequency bands in different directions, thereby enabling beam scanning without multiple antennas
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
Enables scanning with reduced antenna count by sequentially changing the frequency of radio waves, enhancing directional gain and reducing the size of the radar apparatus.
Implementation Method 1
a filter portion that is provided to the dielectric member and includes a plurality of band transmission portions arranged along a scanning direction, the plurality of band transmission portions being configured to respectively transmit radio waves within different specific transmission frequency bands
Implementation Method 2
an antenna section that is configured to radiate radio waves based on fed electrical power
Data Source
AI summary
A radar apparatus is provided which includes an antenna section that is configured to radiate radio waves based on fed electrical power, a plate dielectric member that is provided so as to transmit the radio waves radiated from the antenna section, a filter portion that is provided to the dielectric member and includes a plurality of band transmission portions arranged along a scanning direction, the plurality of band transmission portions being configured to respectively transmit radio waves within different specific transmission frequency bands, and a power feeding section that is configured to feed the electrical power to the antenna section and is configured to set specific frequency bands included in the respective specific transmission frequency bands to set radiation bands and sequentially change a frequency of the radio waves radiated from the antenna section to frequencies within the respective set radiation bands.