Integrated Directional Coupler and Power Combiner Coil Layout

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Solution Overview

Problem

Existing radio communication and radar sensor devices face challenges in achieving target output transmit powers within semiconductor technology constraints due to separate implementations of power combiners and directional couplers, which result in increased circuit footprint and power loss.

Innovation Solution

Integration of power combiners and directional couplers on different metal layers of an integrated circuit die, with overlapping coil areas, eliminating the need for a separate connection and reducing power loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If power combiners and directional couplers are implemented separately, then each component can be optimized independently, but the overall circuit footprint increases and power loss increases

Engineering Contradiction:

Improvepower lossVSAvoidseparate implementation

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent combines the power combiner and directional coupler into a single integrated circuit structure where the same coil system performs both power combining and directional coupling functions. This merging eliminates the need for separate components, reducing overall power loss and simplifying the device architecture while maintaining independent optimization capabilities through shared magnetic coupling paths.

Inventive Principle:

Principle #5Merging (Combining)

2Area of stationary object

If power combiners and directional couplers are implemented separately, then design and manufacturing are simpler, but the circuit footprint area increases

Engineering Contradiction:

Improvecircuit footprintVSAvoidseparate implementation

Core Design Contradiction:

Area of stationary objectVSEase of manufacture

Solution Approach 1:

The patent utilizes multiple metal layers in the integrated circuit structure, placing the power combiner and directional coupler coils on different layers. This three-dimensional arrangement allows the components to overlap spatially, significantly reducing the circuit footprint area while maintaining separate manufacturing processes for each layer, thus preserving ease of manufacture.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Loss of energy

If separate connection between power combiner and directional coupler is used, then implementation is straightforward, but power loss increases due to connection losses

Engineering Contradiction:

Improvepower lossVSAvoidintegration structure

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent merges the power combiner and directional coupler into a unified structure where the secondary coil of the power combiner directly magnetically couples with the primary coil of the directional coupler through shared magnetic fields. This eliminates separate physical connections and associated power losses, reducing energy loss while the integrated coil design maintains manageable structural complexity.

Inventive Principle:

Principle #5Merging (Combining)

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 integration leads to a more compact layout, lower power losses, and improved energy efficiency, enabling higher output power and reduced heat generation compared to traditional designs.

Implementation Method 1

a secondary coil coupled to the combined power output, configured to magnetically couple to the first primary coil, and configured to magnetically couple to the second primary coil

Methodology Applied

Scientific EffectMagnetic coupling: Electromagnetic Induction

Implementation Method 2

a tertiary coil configured to magnetically couple to the secondary coil and including a first end coupled to the first directional coupler output, and a second end coupled to the second directional coupler output

Methodology Applied

Scientific EffectMagnetic coupling: Electromagnetic Induction

Data Source

PatentUS20260018774A1Integration of directional couplers with power combiners

Publication Date: 2026.01.15 TEXAS INSTRUMENTS INC

AI summary

An example device includes a first primary coil, a second primary coil, a combined power output, a first directional coupler output, a second directional coupler output. The example device also includes a secondary coil coupled to the combined power output, configured to magnetically couple to the first primary coil, and configured to magnetically couple to the second primary coil. The example device further includes a tertiary coil configured to magnetically couple to the secondary coil and including a first end coupled to the first directional coupler output, and a second end coupled to the second directional coupler output.