CRLH Metamaterial Power Combiners for Multi-Band RF Systems
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Solution Overview
Problem
Conventional materials struggle to efficiently combine and divide electromagnetic signals across multiple frequency bands, leading to large device sizes and limited spectral capabilities.
Innovation Solution
The use of composite left and right handed (CRLH) metamaterial structures, which include specific electrical lengths for unit cells and transmission lines to achieve phase matching at different frequencies, allowing for compact devices that can operate across dual or multi-band frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional materials are used for power combiners and dividers, then the devices can operate at single frequency, but the device size becomes large and spectral capabilities are limited
Solution Approach 1:
The patent employs composite right-handed/left-handed (CRLH) metamaterial structures that combine both right-handed and left-handed transmission line units within a single device. This composite material approach enables the power combiner/divider to operate across multiple frequency bands (dual-band or multi-band) simultaneously, achieving broad spectral capabilities while maintaining a compact physical footprint. The CRLH structure allows the device to handle both conventional right-handed waves and left-handed backward waves, providing enhanced frequency adaptability.
Solution Approach 2:
The device is segmented into multiple transmission line units, each with specific electrical lengths designed to provide phase matching at different frequency bands. By dividing the structure into discrete CRLH unit cells with tailored electrical characteristics, the patent achieves compact dimensions while maintaining multi-frequency operation capability. Each segment contributes to the overall phase compensation needed for different bands.
2Adaptability or versatility
If conventional transmission lines are used, then the structure is simple, but phase matching across multiple frequencies cannot be achieved
Solution Approach 1:
The patent utilizes parameter changes by designing transmission line units with specific electrical lengths that vary to achieve phase matching at different frequencies. The CRLH structure allows independent control of phase characteristics at different frequency bands by adjusting the electrical lengths of individual unit cells. This parameter optimization enables precise phase matching across dual-band or multi-band frequencies while managing structural complexity through systematic design.
Solution Approach 2:
The patent incorporates left-handed transmission line units that exhibit inverted phase characteristics compared to conventional right-handed lines. This inversion allows the structure to compensate for phase delays in a unique way, enabling phase matching across wide frequency ranges. The left-handed units provide negative phase progression that counteracts the positive phase progression of right-handed units, creating flexible phase control for multi-frequency operation.
3Reliability
If electrical lengths are optimized for one frequency, then performance is good at that frequency, but the device cannot operate efficiently at other frequencies
Solution Approach 1:
The power combiner/divider is designed with universal CRLH transmission line units that can simultaneously provide phase matching and signal combining/splitting functions across multiple frequency bands. Each transmission line unit is engineered to maintain proper electrical length relationships at different frequencies, allowing the same structure to deliver reliable signal integrity at both fundamental and harmonic frequencies or across different communication bands, achieving multi-functionality in a single device.
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
Enables the creation of compact RF power combiners and dividers that can efficiently operate across multiple frequency bands, reducing physical dimensions while maintaining signal integrity and spectral capabilities.
Implementation Method 1
The propagation of electromagnetic waves in most materials obeys the right handed rule for the (E,H,β) vector fields
Implementation Method 2
a metamaterial can have a structure to exhibit a negative refractive index where the phase velocity direction is opposite to the direction of the signal energy propagation
Implementation Method 3
CRLH metamaterials can be structured and engineered to exhibit electromagnetic properties that are tailored for specific applications
Implementation Method 4
Each CRLH unit cell in the main transmission line is structured to have a first electrical length that corresponds to a phase of zero degree, 180 degrees or a multiple of 180 degrees at a first signal frequency and a second, different electrical length that corresponds to a phase of zero degree, 180 degrees or a multiple of 180 degrees at a second, different signal frequency
Implementation Method 5
a main CRLH transmission line comprising CRLH unit cells coupled in series and a plurality of branch CRLH transmission lines each comprising of CRLH unit cells coupled in series
Data Source
AI summary
Techniques, apparatus and systems that use composite left and right handed (CRLH) metamaterial structures to combine and divide electromagnetic signals at multiple frequencies. The metamaterial properties permit significant size reduction over a conventional N-way radial power combiner or divider. Dual-band serial power combiners and dividers and single-band and dual-band radial power combiners and dividers are described.