Directional Coupler Termination Layout for Multi-Frequency Coupling
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Solution Overview
Problem
Existing directional couplers face challenges in maintaining optimal coupling factors and minimizing insertion loss across multiple signal frequencies, leading to increased footprint and power consumption in multi-mode, multi-frequency applications.
Innovation Solution
The directional coupler employs multiple termination ports connected at different locations along the coupled transmission line, with adjustable impedances to optimize coupling factors for specific frequencies, maintaining constant power levels and minimizing insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single termination port is used in conventional directional couplers, then the device structure is simple, but the coupling factor cannot be optimized for multiple signal frequencies simultaneously, leading to increased insertion loss and variable power levels across frequencies
Solution Approach 1:
The coupled transmission line is divided into multiple sections, each with its own termination port and impedance element. Each section is optimized for specific frequency ranges, allowing the coupler to provide optimized coupling factors across multiple signal frequencies simultaneously while maintaining manageable structural complexity
Solution Approach 2:
The directional coupler with multiple termination ports serves multiple functions: it provides optimized coupling for different frequency bands, maintains constant power levels across frequencies, and reduces insertion loss for multi-mode operations, making it suitable for versatile multi-frequency applications
2Adaptability or versatility
If multiple termination ports with different impedances are used to optimize coupling for multiple frequencies, then coupling factor optimization across frequencies is achieved, but the device footprint increases
Solution Approach 1:
The multiple termination ports are arranged along the length of the coupled transmission line rather than requiring lateral expansion. By utilizing the longitudinal dimension of the transmission line, the design achieves multi-frequency optimization without proportionally increasing the device footprint
3Adaptability or versatility
If conventional single-frequency optimized couplers are used for multi-frequency applications, then the device structure is simple, but additional components like attenuators or frequency combiners are needed, increasing power consumption
Solution Approach 1:
The directional coupler is designed to inherently handle multiple frequencies through its multiple termination ports and impedance elements, eliminating the need for additional frequency-specific components like attenuators or combiners. This integrated multi-frequency capability reduces overall power consumption by removing the energy requirements of auxiliary components
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 configuration allows for efficient operation across a range of signal frequencies with reduced insertion loss and constant power levels, eliminating the need for additional components like attenuators or frequency combiners, thereby minimizing the coupler's footprint and improving power amplifier efficiency.
Implementation Method 1
a coupled transmission line electromagnetically coupled to the main transmission line
Data Source
AI summary
According to some aspects of this disclosure a radio frequency signal coupler is provided. The radio frequency coupler includes an input port, an output port, a main transmission line extending between the input port and the output port, a coupled transmission line electromagnetically coupled to the main transmission line, at least one coupled port coupled to the coupled transmission line, and a plurality of termination ports connected to the coupled transmission line, each termination port of the plurality of termination ports being connected to the coupled transmission line at a different location to provide a plurality of coupling factors corresponding to a plurality of signal frequencies.