Multi-band Waveguide Antenna Feed with Metamaterial Tubes
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Solution Overview
Problem
Current antennas fail to provide the desired level of performance for modern communications systems that require multiple frequency bands, leading to increased cost, size, and weight due to the need for multiple antennas, and are inefficient with complex diplexers or manually-swapped feeds.
Innovation Solution
A multi-band waveguide reflector antenna feed is created using concentric tubes with metamaterial structures on their surfaces, where the relative radial positioning and structural interconnection via loading materials or support structures maintain radial separation to achieve desired frequency characteristics, forming a compact, cost-effective, and robust antenna configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are used to cover multiple frequency bands, then frequency band coverage is improved, but device complexity, size, and weight increase
Solution Approach 1:
The patent combines multiple waveguide feeds operating at different frequency bands into a single integrated antenna structure. The concentric tube configuration allows multiple feeds to coexist in one physical assembly, eliminating the need for separate antennas and reducing overall system complexity while maintaining multi-band capability.
Solution Approach 2:
The patent employs a nested configuration where inner tubes are positioned within outer tubes in a concentric arrangement. Each tube serves as a waveguide feed for different frequency bands, with the innermost tube handling higher frequencies and outer tubes handling lower frequencies. This nesting approach maximizes space utilization and reduces the overall footprint of the antenna system.
2Adaptability or versatility
If manual feed swapping or complex diplexers are used, then frequency band switching is achieved, but reliability and ease of operation deteriorate
Solution Approach 1:
The patent implements a dynamic feed selection mechanism where the system can automatically switch between different waveguide feeds based on the required frequency band. The concentric tube structure allows any of the nested feeds to be activated as needed, providing flexible and reliable frequency band switching without manual intervention or complex diplexer assemblies.
3Adaptability or versatility
If concentric tube configuration with radial separation is used, then multi-band performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies different metamaterial structures to different surfaces of the concentric tubes, with each surface having locally optimized properties for its specific frequency band. The inner tube surface has metamaterials optimized for higher frequencies, while outer tube surfaces have metamaterials optimized for lower frequencies. This local quality approach allows each band to be independently optimized without requiring perfect precision across the entire structure.
Data Source
AI summary
The present disclosure includes a method for producing a multi-band waveguide reflector antenna feed. The antenna feed includes a first tube and a second tube. The first and second tubes are connected to form a concentric multi-band waveguide feed array. The first tube includes a surface(s) which is/are at least partially covered by metamaterial(s), thereby forming a first waveguide feed. The second tube also includes a surface(s) which is/are at least partially covered by metamaterial(s). A radial separation is established between the first tube and the second tube, thereby forming a second waveguide feed. The radial separation may be maintained between the first tube and the second tube by one or more of: a loading material, support structures, strings, and wires. The loading material, support columns, strings, and/or wires also structurally interconnect the first tube and the second tube.