Layered RF Module With Curved Waveguides for Low-Sidelobe Arrays
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Solution Overview
Problem
Designing high-frequency antenna arrays is challenging due to the need for close spacing of radiating elements to reduce secondary lobes, which conflicts with the size requirements of polarizers and electronic amplification circuits, leading to undesirable side lobes and limited flexibility in element positioning.
Innovation Solution
A passive radiofrequency module with a layered structure, where waveguides interposed between radiating elements and ports allow independent spacing, enabling reduced radiating element spacing to minimize side lobes and accommodating larger polarizers and electronic circuits, while also allowing for variable spacing and different arrangements of radiating elements and ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If radiating elements are placed close together to reduce secondary lobes, then the amplitude of secondary lobes is reduced, but the minimum spacing is incompatible with the size of polarizers and electronic amplification circuits
Solution Approach 1:
The patent introduces a vertical dimension by stacking radiating elements at different heights (first layer and second layer) with different polarizations. This 3D arrangement allows horizontal spacing to be increased while maintaining effective array performance, as elements in different layers can be positioned without interfering with polarizers and electronic circuits that are arranged in the horizontal plane.
Solution Approach 2:
The antenna array is segmented into multiple layers with different functions: first layer radiating elements with first polarization, second layer radiating elements with second polarization, polarizers positioned between layers, and electronic amplification circuits positioned at the bottom. This segmentation allows each component to be optimally sized and positioned independently, resolving the spacing conflict.
2Reliability
If polarizers and electronic amplification circuits are given sufficient size for proper operation, then their performance is improved, but the spacing between radiating elements must be increased which gives rise to undesirable secondary lobes
Solution Approach 1:
By utilizing the vertical dimension for stacking radiating elements and positioning polarizers and electronic circuits in different vertical planes, the patent allows these components to have sufficient horizontal size for proper operation without increasing the horizontal spacing between radiating elements. The vertical separation eliminates the conflict between component size and element spacing.
3Ease of manufacture
If radiating elements are spaced widely to accommodate polarizers and electronic circuits, then component placement is facilitated, but the amplitude of secondary transmission or reception lobes increases
Solution Approach 1:
The patent resolves this contradiction by moving the array structure into the vertical dimension, stacking radiating elements at different heights. This allows wide horizontal spacing for easy placement of polarizers and electronic circuits while maintaining effective array performance through the vertical arrangement, preventing the formation of strong secondary lobes that would result from wide horizontal spacing.
4Object-generated harmful factors
If the spacing between radiating elements is reduced to improve array performance, then secondary lobe amplitude is reduced, but the overall dimensions of electronic amplification and phase-shifting circuits must be reduced which complicates their design
Solution Approach 1:
By stacking radiating elements vertically in multiple layers, the patent allows electronic amplification and phase-shifting circuits to maintain standard, larger dimensions in the horizontal plane without being constrained by reduced element spacing. The vertical layering decouples the spacing requirement from the electronic circuit dimensions, simplifying circuit design while maintaining array performance.
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 configuration reduces the amplitude of secondary lobes, allows for closer placement of electronic components, and enables flexible positioning of radiating elements and polarizers, improving the performance and design flexibility of high-frequency antenna arrays.
Implementation Method 1
each waveguide being intended to transmit a radiofrequency signal in one or other direction between a port of the fourth layer and a radiating element
Data Source
AI summary
Radiofrequency module, including: a first layer including an array of radiating elements, each radiating element having a cross section for supporting at least one wave propagation mode, a second layer forming an array of waveguides; a fourth layer forming an array of ports; the second layer being interposed between the first and the fourth layer; each waveguide being connected to a port on the one hand and to a radiating element on the other hand for transmitting a radiofrequency signal between this port and this radiating element; the spacing between two ports being different from the spacing between the radiating elements, so that the surface area of the first layer is different from the surface area of the fourth layer; the waveguides being curved.