Multiband Antenna Array Layout for Gain and Scan Angle
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Solution Overview
Problem
Conventional multiband antenna arrays face issues with lower realized array gain and reduced scan angle due to uniform spacing, which leads to coupling between low and high band antenna members, compromising performance.
Innovation Solution
A multiband antenna array design with hybrid-distance spacing between high and low band antenna elements, where distances are tailored to be 0.3-0.8 times the wavelength of respective band signals, allowing for improved low-band realized array gain and high-band scan angle, while minimizing array size and reducing filter losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform spacing is used between multi-band antenna units, then the array structure is simple and easy to manufacture, but the realized array gain is reduced due to coupling between low band antenna members
Solution Approach 1:
The patent applies local quality by setting different spacing distances for different antenna members. Specifically, the distance between low band antenna members is set to 0.3-0.8 wavelengths of the low band signal, while the distance between high band antenna members is set to 0.3-0.8 wavelengths of the high band signal. This localized optimization of spacing for each band resolves the coupling issue between low band antennas while maintaining high band performance, thereby improving realized array gain without significantly complicating the overall array structure.
Solution Approach 2:
The patent changes the spacing parameter from a uniform value to band-specific values. By setting the spacing between antenna members to 0.3-0.8 wavelengths specific to each band's operating frequency, the patent optimizes the electrical characteristics for both low and high bands simultaneously. This parameter change eliminates the harmful coupling effects while maintaining the desired radiation patterns and array gain for both bands.
2Ease of manufacture
If uniform spacing is used between multi-band antenna units, then the manufacturing process is simplified, but the scan angle for high band signals is reduced
Solution Approach 1:
The patent applies local quality by implementing different spacing configurations for low band and high band antenna members. The high band antenna members are spaced at 0.3-0.8 wavelengths of the high band signal, which is optimized to provide wider scan angles for high band operations. This localized spacing optimization allows the array to achieve broader beam steering capabilities in the high band without compromising the low band performance or significantly increasing manufacturing complexity.
Solution Approach 2:
The patent changes the spacing parameter to be frequency-band dependent, setting it to 0.3-0.8 wavelengths of the respective band signal. For high band signals, this spacing configuration enables wider scan angles by reducing element coupling and improving phase distribution across the array. This parameter optimization allows the system to achieve enhanced adaptability for high band signal scanning while maintaining a relatively simple overall structure.
3Volume of moving object
If the distance between antenna members is reduced to minimize array size, then the compactness is improved, but the coupling between antenna members increases reducing performance
Solution Approach 1:
The patent changes the spacing parameter to a specific range of 0.3-0.8 wavelengths for each band, which optimizes the balance between compactness and performance. This parameter selection is based on electromagnetic theory that identifies this range as optimal for minimizing coupling effects while maintaining reasonable array size. By setting the distance within this specific range, the patent achieves both compact dimensions and acceptable signal transmission performance without excessive element spacing.
Data Source
AI summary
A multiband antenna array is provided. The multiband antenna array includes a first multi-band antenna unit, a first high band antenna member, and a first low band antenna member. The first multi-band antenna unit includes a first high band antenna element and a first low band antenna element. A first distance is formed between the center of the first multi-band antenna unit and the center of the first high band antenna member. The first distance is 0.3˜0.8 times the wavelength of a high band signal. A second distance is formed between the center of the first multi-band antenna unit and the center of the first low band antenna member. The second distance is 0.3˜0.8 times the wavelength of a low band signal.