Double Slot Array Antenna Inclined Beam Design
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Solution Overview
Problem
Designing a double slot array antenna with a desired azimuth beam pattern and elevation angle beam pattern is challenging due to the complexity of variables involved, particularly for corner radar applications where an inclined wide-angle beam is required for effective target detection.
Innovation Solution
A method involving setting the number of radiation elements, modeling simulation models, adjusting offset distances and lengths of slots, selecting similar azimuth beam patterns, and calculating radiated power ratios to determine design values for each radiation element, ensuring a desired beam pattern with low side lobe levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single slot shape is used for the radiation element, then the azimuth beam pattern uniformly radiates electromagnetic waves in the observation angle range, but it cannot produce an inclined wide-angle beam for effective target detection in corner radar applications
Solution Approach 1:
The radiation element is divided into two separate slots (first slot and second slot) with different orientations. The first slot extends in a first direction and the second slot extends in a second direction, allowing each slot to contribute differently to the overall beam pattern. This segmentation enables the antenna to achieve both uniform radiation and inclined wide-angle beam characteristics that a single slot cannot provide.
Solution Approach 2:
The double slot structure introduces asymmetry in the radiation element design. The slots have different orientations and dimensions, creating an asymmetric current distribution that generates the desired inclined beam pattern. This asymmetry allows the antenna to radiate electromagnetic waves in a wide angle range while maintaining effectiveness for corner radar applications.
2Measurement precision
If the antenna is mounted in an inclined state at the corner of the vehicle, then the beam can radiate further away and detect targets at greater distance, but the design becomes more complex due to multiple variables
Solution Approach 1:
The inclined beam pattern is built into the antenna structure itself through the double slot configuration, rather than relying solely on the mounting orientation. By pre-designing the radiation element to produce an inclined wide-angle beam, the system achieves extended detection range while simplifying the overall design process. The slots are configured with specific dimensions and orientations that inherently create the desired beam characteristics.
Solution Approach 2:
The invention changes the fundamental parameters of the radiation element by using a double slot structure with specific dimensional relationships. The first slot has a length L1 and width W1, while the second slot has a length L2 and width W2, with specific ratios between these dimensions. This parameter optimization allows the antenna to achieve inclined wide-angle radiation without requiring complex mounting arrangements.
3Adaptability or versatility
If a double slot shape is used for the radiation element, then an inclined azimuth beam pattern can be achieved, but the design becomes difficult due to various variables involved in achieving the desired beam pattern
Solution Approach 1:
The invention applies local quality by optimizing specific regions of the double slot structure. The first slot and second slot have different local characteristics (different lengths, widths, and orientations) that are specifically tailored to produce the desired inclined beam pattern. This localized optimization reduces the number of variables that need to be adjusted globally, simplifying the design process.
Solution Approach 2:
The double slot structure can be considered as a composite radiation element where two different slot configurations work together. By combining the radiation characteristics of two differently oriented slots, the invention achieves an inclined wide-angle beam pattern that neither slot could produce alone, while maintaining a manageable design through their coordinated configuration.
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
This method enables the effective design of double slot array antennas with beam patterns similar to target designs, achieving low side lobe levels in elevation angle beams, thereby improving detection capabilities and reducing clutter signals.
Implementation Method 1
A radar for a vehicle is a device that radiates an electromagnetic wave signal from an antenna
Data Source
AI summary
A method for designing a double slot array antenna and a double slot array antenna designed thereby are disclosed. The method for designing the double slot array antenna, includes the steps of: (a) setting the number of radiation elements of a double slot structure arranged in a waveguide of an array antenna to be designed, and setting a radiated power ratio required for each of the radiation elements; (b) modeling a simulation model for each of the radiation elements; (c) setting an offset distance of a main slot of each of the radiation elements applied to the simulation model; (d) deriving azimuth beam patterns for cases in which an offset distance and a length of a sub-slot of each of the radiation elements applied to the simulation model are changed; (e) selecting a similar azimuth beam pattern similar to a target azimuth beam pattern among the derived azimuth beam patterns; (f) calculating a radiated power ratio for the case corresponding to the similar azimuth beam pattern; and (g) comparing the calculated radiated power ratio with the set radiated power ratio to determine a design value of each of the radiation elements.