Slot Array Antenna Waveguide Design for Side-Lobe Control
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Solution Overview
Problem
Existing slot array antennas lack control over electromagnetic wave intensity, leading to suboptimal directivity and side-lobe control, and are not capable of efficiently handling various polarized waves, limiting their gain and efficiency.
Innovation Solution
A slot array antenna design featuring a radiation waveguide with a two-dimensionally arrayed slot array, where slots are arranged to excite high-order modes and polarize electromagnetic waves, allowing for intensity control and side-lobe suppression, and incorporating slot pairs that radiate circularly polarized waves by adjusting slot lengths and phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If slots are arrayed in conventional slot array antennas, then electromagnetic waves are radiated, but control over wave intensity is lost and directivity cannot be optimized
Solution Approach 1:
The patent changes the geometric parameters of slots (width, length, orientation) to control electromagnetic wave intensity distribution. By adjusting slot width and length, the radiation intensity from each slot can be independently controlled, enabling directivity optimization without adding complex control mechanisms.
Solution Approach 2:
The patent applies different slot configurations at different positions within the antenna array. Slots are designed with varying dimensions and orientations according to their specific positions, creating local variations in radiation characteristics that achieve overall directivity control and side-lobe suppression.
2Manufacturing precision
If conventional slot arrays are used, then radiation is achieved, but side-lobe control is suboptimal
Solution Approach 1:
The patent employs systematic variations in slot parameters (width, length, spacing) to control the amplitude distribution across the antenna array. This enables precise side-lobe level control by optimizing the aperture distribution, achieving lower side-lobes through carefully designed parameter gradients.
Solution Approach 2:
The patent introduces adjustability in slot configurations, allowing the antenna to adapt its radiation pattern. By making slot dimensions and positions variable rather than fixed, the system can dynamically optimize performance for different operating conditions and achieve better side-lobe control.
3Power
If simple slot arrays are implemented, then structural simplicity is maintained, but gain and efficiency are limited
Solution Approach 1:
The patent optimizes slot dimensions (width, length, depth) and spacing to maximize radiation efficiency and gain. By carefully selecting these parameters based on the operating wavelength and desired radiation pattern, the antenna achieves high gain without requiring complex active components or multiple stages.
Solution Approach 2:
The patent divides the antenna into multiple independently optimized slot elements within the waveguide structure. Each slot segment can be designed to contribute optimally to the overall radiation, with individual parameter optimization leading to cumulative gains in total antenna performance.
4Adaptability or versatility
If fixed slot configurations are used, then manufacturing is simplified, but adaptability to various polarized waves is reduced
Solution Approach 1:
The patent designs the slot array to handle multiple polarization modes (horizontal, vertical, circular) through a unified structure. By configuring slots with specific orientations and combinations, the same antenna structure can radiate and receive various polarized waves, making it universally applicable without requiring separate antennas for different polarizations.
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 design enhances gain and efficiency, enables effective side-lobe control, and supports various polarized waves, while maintaining structural simplicity and lightweight construction.
Implementation Method 1
each slot of the slot array formed in the introduction waveguide is provided at every 1/2 wavelength or integer multiple of 1/2 wavelength of the electromagnetic waves inside the introduction waveguide in the direction propagating the electromagnetic waves in the introduction waveguide, and electromagnetic waves of a high-order mode are excited in the radiation waveguide where a plurality of magnetic loops are arranged in the direction of propagating the electromagnetic waves in the introduction waveguide
Implementation Method 2
the slot array formed in the first conductor plane of the radiation waveguide is formed such that primary wave polarizing planes of radiated electric fields are oriented to the same direction by coupling to the electromagnetic waves of the high-order mode, and polarized wave components perpendicular to the primary wave polarizing planes cancel out for each other
Data Source
AI summary
A slot array antenna is provided. In one embodiment, the slot array antenna includes a radiation waveguide having a first conductor plane in which a slot array is two-dimensionally arrayed and a second conductor plane in parallel thereto, and an introduction waveguide formed with a slot array, for introducing electromagnetic waves in a waveguide space of the radiation waveguide. Each slot of the slot array of the introduction waveguide is provided at an ½ wavelength or odd-number multiple of ½ wavelength of a wavelength inside the waveguide with respect to a direction of propagating the electromagnetic waves in the introduction waveguide, and the slots are tilted in the same direction, and thereby exciting electromagnetic waves in a high-order mode of a TE-mode in the radiation waveguide 30.