Waveguide Fed Stripline Antenna Integration
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Solution Overview
Problem
Existing waveguide-to-stripline transitions require multiple costly adapters and are bulky, making them unsuitable for high-frequency applications due to their size and weight.
Innovation Solution
A low-loss waveguide fed stripline antenna apparatus is designed with a substrate assembly that includes a waveguide antenna element, reference ground planes, and stripline antenna element, where the microstrip line is proximity coupled to the waveguide antenna element and the stripline is electrically connected, with vias for impedance matching and ground plane overlap to reduce size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple adapters (waveguide-to-coax, coax-to-microstrip, microstrip-to-stripline) are used for transition, then signal transmission is achieved, but device size and weight increase significantly
Solution Approach 1:
The patent combines multiple transition functions (waveguide-to-coax, coax-to-microstrip, microstrip-to-stripline) into a single integrated substrate assembly. The waveguide antenna element, microstrip line, and stripline are all mounted on one substrate with direct electrical connections, eliminating the need for separate adapters and reducing overall weight.
Solution Approach 2:
The substrate assembly serves multiple functions simultaneously: it acts as the waveguide-to-stripline transition structure, provides mechanical support, establishes electrical connections between different transmission line types, and serves as the mounting platform for antenna elements. This multi-functionality eliminates the need for dedicated adapters for each transition.
2Reliability
If multiple adapters are used for waveguide-to-stripline transition, then signal transmission is achieved, but manufacturing cost increases due to high precision machining requirements
Solution Approach 1:
The patent consolidates multiple precision-machined adapters into a single substrate assembly that can be manufactured using standard PCB fabrication techniques. This reduces manufacturing complexity and cost by eliminating the need for high-precision machining of multiple separate components.
Solution Approach 2:
The patent replaces mechanical adapter assemblies (requiring precision machining and assembly) with an integrated substrate-based system where electrical connections are established through printed circuit board traces and mounting holes. This substitution of mechanical systems with PCB-based systems significantly reduces manufacturing cost and complexity.
3Reliability
If traditional waveguide-to-coax transitions are used, then signal transmission is achieved, but the apparatus size and weight become non-ideal for many applications
Solution Approach 1:
The patent merges the waveguide antenna element, transition structure, and stripline antenna element into a single compact substrate assembly. This integration dramatically reduces the volume required for the transition apparatus compared to traditional multi-component adapter systems.
Solution Approach 2:
The patent transitions from a three-dimensional multi-component adapter assembly to a planar two-dimensional substrate-based structure. By flattening the transition path and eliminating vertical stacking of multiple adapters, the apparatus achieves a lower profile and reduced overall volume.
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 apparatus achieves reduced size, weight, and cost compared to existing adapters, enabling efficient high-frequency signal transmission and reception with a lower profile, suitable for applications up to 20 GHz frequencies.
Implementation Method 1
the microstrip line is proximity coupled to the waveguide antenna element
Implementation Method 2
the stripline is electrically connected to the microstrip line
Implementation Method 3
one or more vias electrically shorting the first reference ground plane to the second reference ground plane
Data Source
AI summary
An apparatus may include a substrate assembly having a first side and a second side. The apparatus may further include a waveguide antenna element positioned on the first side of the substrate assembly. The apparatus may also include a first reference ground plane positioned on the first side of the substrate assembly. The apparatus may include a microstrip line positioned within the substrate assembly. The apparatus may further include a stripline positioned within the substrate assembly and electrically coupled to the microstrip line, the first reference ground plane overlapping the stripline. The apparatus may also include a second reference ground plane positioned on the second side of the substrate assembly and overlapping both the microstrip line and the stripline. The apparatus may include a stripline antenna element positioned on the second side of the substrate assembly and enclosed by the second reference ground plane.