Multiband Waveguide Structure for Ku/Ka Antenna Feeding
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Solution Overview
Problem
Existing antennas for satellite communication systems are limited to single commercial bands and struggle to efficiently manage multi-band frequencies, leading to mechanical complexity and excess loss due to unutilized waveguide length, especially when supporting both high and low frequency bands simultaneously.
Innovation Solution
The development of multiband guiding structures, including center-fed and edge-fed designs with tunable directional couplers, allows for dynamic reconfiguration of coupling coefficients to support both high and low frequency bands, enabling efficient propagation of feed waves across multiple frequency bands to RF radiating antenna elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-band waveguide structure is used, then the antenna supports one commercial band (Ku or Ka), but it cannot efficiently manage multi-band frequencies and requires separate antennas for different bands
Solution Approach 1:
The waveguide structure is designed to perform multiple functions by supporting both Ku-band and Ka-band frequencies through the same physical structure. The waveguide includes a bottom guide for lower frequencies and a top guide for higher frequencies, allowing a single antenna system to handle multiple commercial bands without requiring separate antennas for each band.
Solution Approach 2:
The waveguide is divided into segmented sections with different geometries to handle different frequency bands. The bottom waveguide section has dimensions optimized for Ku-band frequencies while the top waveguide section has dimensions optimized for Ka-band frequencies. This segmentation allows each section to efficiently guide its designated frequency range while maintaining a unified overall structure.
2Productivity
If a folded dual-layer waveguide structure is used, then signal can be propagated from center to edge and bent upward, but excess loss occurs due to unutilized waveguide length
Solution Approach 1:
The waveguide structure incorporates variable impedance sections that can be dynamically adjusted to match the specific frequency being transmitted. By changing the impedance characteristics along the waveguide path, the structure optimizes signal propagation for either Ku-band or Ka-band operations, ensuring that the full waveguide length is effectively utilized and minimizing reflections and energy loss.
3Reliability
If separate antennas are used for different frequency bands, then each band can be optimized independently, but the form factor increases and connectivity performance decreases
Solution Approach 1:
The patent merges the functionality of separate Ku-band and Ka-band antennas into a single integrated antenna structure. The combined waveguide system allows both frequency bands to be transmitted through one aperture, reducing the overall form factor and improving connectivity performance by eliminating the need for multiple separate antenna installations on mobile platforms.
4Productivity
If a center-fed guide structure is used for high frequency band, then efficient propagation is achieved, but low frequency band propagation requires edge-fed structure adding complexity
Solution Approach 1:
The waveguide structure is designed to perform multiple feeding functions through a unified structure. The bottom waveguide section operates as a center-fed guide for Ku-band frequencies while the top waveguide section operates as an edge-fed guide for Ka-band frequencies. This multi-functional design allows efficient propagation for both frequency bands without requiring completely separate feeding structures.
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 solution enhances aperture distribution and power transfer, reduces mechanical complexity, and eliminates excess loss by independently controlling high and low band apertures, effectively supporting both Ku and Ka bands within a single antenna system.
Implementation Method 1
a center-fed, multi-band wave guiding structure coupled to the antenna aperture to receive a feed wave in two different frequency bands and propagate the feed wave to the RF radiating antenna elements
Data Source
AI summary
Multiband guiding structures for antennas and methods for using the same are described. In one embodiment, an antenna comprises: an antenna aperture with radio-frequency (RF) radiating antenna elements; and a center-fed, multi-band wave guiding structure coupled to the antenna aperture to receive a feed wave in two different frequency bands and propagate the feed wave to the RF radiating antenna elements of the antenna aperture.