Vivaldi Antenna Amplifier Assembly for High-Frequency Loss Reduction
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Solution Overview
Problem
Conventional spatial power combining devices using finline antennas face issues such as increased lossiness at higher frequencies and the difficulty of ensuring proper RF grounding, leading to output power dropouts and amplifier instability.
Innovation Solution
The use of Vivaldi antennas with a circular backstub and tapered slot portion in the amplifier assembly simplifies manufacturing, eliminates the need for attachment to adjacent assemblies, and reduces losses, particularly at frequencies above 15 GHz, by incorporating a printed circuit board assembly with transmission lines coupled to the antennas and an amplifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If finline antennas are used in amplifier assemblies, then the spatial power combining device can be constructed with a standardized design, but the device becomes increasingly lossy at higher frequencies and requires complex RF grounding attachments
Solution Approach 1:
The patent changes the antenna type parameter from finline to Vivaldi, which fundamentally alters the frequency response characteristics. Vivaldi antennas maintain low loss at high frequencies (15 GHz and above) due to their tapered slot geometry that supports broadband operation, whereas finline antennas exhibit increasing losses as frequency increases. This parameter change resolves the contradiction by selecting an antenna type whose inherent characteristics match the high-frequency operational requirements.
2Device complexity
If finline antennas are used, then the amplifier assembly can be designed with integrated grounding, but proper RF grounding attachment between adjacent assemblies becomes difficult to ensure, leading to output power dropouts and amplifier instability
Solution Approach 1:
The patent extracts the grounding requirement from the antenna design itself. Vivaldi antennas do not require RF grounding along their main axis like finline antennas do. This eliminates the need for solder-attachment between adjacent amplifier assemblies for grounding purposes. The extraction of this problematic requirement resolves the contradiction by removing the source of reliability issues while maintaining the integrated design benefits.
3Device complexity
If finline antennas are used, then the amplifier assembly structure is established, but the top layer metal of each finline antenna requires precise solder-attachment to adjacent amplifier assemblies, increasing assembly difficulty
Solution Approach 1:
The patent removes the solder-attachment requirement for the antenna top layer metal by selecting Vivaldi antennas that do not require RF grounding. This eliminates the need for precise alignment and soldering operations between adjacent assemblies that are mandatory for finline antennas. The manufacturing process is simplified while the amplifier assembly structure remains intact.
4Device complexity
If conventional finline antenna designs are used, then the amplifier assembly can be constructed, but loss reduction is particularly needed at frequencies of 15 GHz or greater
Solution Approach 1:
The patent changes the antenna geometry parameters from finline configuration to Vivaldi configuration with its characteristic tapered slot and exponential curve. This parameter change enables broadband operation with low loss at high frequencies (15 GHz and above). The Vivaldi antenna's gradual tapering allows for better impedance matching and reduced reflections, directly addressing the high-frequency loss issue while maintaining constructability.
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 the reliability and efficiency of spatial power combining devices by reducing losses and simplifying assembly, thereby improving output power stability and performance at high frequencies.
Implementation Method 1
Each individual amplifier assembly includes an input antipodal finline antenna, an amplifier, and an output antipodal finline antenna... an electromagnetic signal is passed through an input port and an input coaxial waveguide section
Implementation Method 2
Each amplifier amplifies the received signal portion of the electromagnetic signal, and outputs an amplified signal portion via an output antipodal finline antenna
Implementation Method 3
Spatial power combining devices (SPCDs), such as a Qorvo® Spatium® spatial power combining device, utilize a plurality of amplifier assemblies that form a coaxial waveguide to amplify an electromagnetic signal
Data Source
AI summary
An amplifier assembly for a spatial power combining device. The amplifier assembly includes a body that forms a first antenna, wherein the first antenna is a first Vivaldi antenna including a first circular backstub and a first tapered slot portion. The amplifier assembly further includes a second antenna, and a printed circuit board (PCB) assembly fixed to the body. The PCB assembly includes a PCB, an amplifier mounted on the PCB, a first transmission line coupled to the first antenna and to the amplifier, and a second transmission line coupled to the second antenna and to the amplifier.