Wafer Scale Spatial Power Combiner Free Space Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current power combiner architectures face challenges in achieving low loss characteristics like waveguide-based approaches while maintaining the cost advantages of on-wafer or on-board solutions, particularly in thermal management and design complexity.
Innovation Solution
A spatial power combiner design featuring a semiconductor substrate with integrated power amplifiers and microwave substrates separated to transmit amplified RF signals in free space, allowing for combined RF signal propagation and reception, thereby avoiding substrate losses and simplifying heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If waveguide-based power combining is used, then insertion loss is reduced, but manufacturing cost and complexity increase
Solution Approach 1:
The system is divided into separate transmitting and receiving substrates, each performing specific functions. The transmitting substrate contains power amplifiers and transmitting antennas, while the receiving substrate contains receiving antennas and combining network, allowing independent optimization and manufacturing of each segment.
Solution Approach 2:
Free space serves as an intermediary medium for signal transmission between the transmitting and receiving substrates. This eliminates the need for complex waveguide structures while maintaining low loss characteristics through direct electromagnetic wave propagation in the separation region.
2Ease of manufacture
If on-wafer power combining is used, then manufacturing cost is reduced, but thermal management becomes difficult
Solution Approach 1:
The system separates the power amplifying function (heat-generating) on the transmitting substrate from the signal combining function on the receiving substrate. This physical separation allows independent thermal management strategies for each substrate, with the transmitting substrate can be designed with dedicated heat sinks and cooling structures.
Solution Approach 2:
The heat-generating power amplifiers are extracted from the receiving substrate and placed on a separate transmitting substrate. This removes the thermal management burden from the receiving substrate, allowing it to be optimized for signal combining without heat dissipation constraints.
3Power
If integrated power amplifiers are used, then output power is limited to hundreds of milliwatts, but device complexity is reduced
Solution Approach 1:
Multiple low-power integrated power amplifier signals are combined through spatial power combining to achieve high output power. The individual amplifier outputs are transmitted through antennas and combined in free space, merging multiple small-power signals into a single high-power signal without requiring a single complex high-power amplifier.
Solution Approach 2:
The system transitions from circuit-level power combining to spatial power combining by utilizing the third dimension (free space propagation). This allows power amplifiers to be distributed across a substrate plane with their signals combining in the separation region, enabling scalable power output by simply adding more amplifier elements.
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 approach achieves low insertion loss and cost-effectiveness by using a compact design with superior signal linearity and power distribution, enabling higher output powers without the expense and complexity of conventional waveguide-based methods.
Implementation Method 1
the amplified RF signal is transmitted by the first plurality of antennas to produce a combined RF signal in a separation between the first and second microwave substrates
Implementation Method 2
receiving the resulting combined RF signal at a plurality of second antennas, wherein each second antenna produces a received RF signal
Data Source
AI summary
A plurality of power amplifiers are integrated into a semiconductor substrate and coupled to a corresponding first plurality of antennas on an adjacent first microwave substrate. A second microwave substrate carries a second plurality of antennas coupled to a combining network. The second microwave substrate is separated from the first microwave substrate to allow a free space combination of RF energy propagated by the first plurality of antennas.