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Surface electromagnetic wave coupling efficiencies for several excitation techniques.

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|February 20, 2010

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This study experimentally determined the best methods for coupling surface electromagnetic waves onto aluminum at microwave frequencies. Standard rectangular waveguides achieved the highest excitation efficiency at 92%.

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Area of Science:

Electromagnetics
Surface Waves
Microwave Engineering

Background:

Surface electromagnetic waves are crucial for various microwave applications.
Efficiently coupling these waves onto metallic surfaces is a key challenge.
Understanding excitation efficiencies of different techniques is vital for optimizing device performance.

Purpose of the Study:

To experimentally investigate and compare the excitation efficiencies of various techniques for coupling surface electromagnetic waves onto aluminum at microwave frequencies.
To evaluate both standard and novel coupling methods, including optical techniques adapted for microwave frequencies.

Main Methods:

Experimental measurements of excitation efficiencies were conducted at a microwave frequency of 8.445 GHz.
Standard techniques like rectangular waveguides and horn antennas were tested.
Optical techniques (prism, grating) and novel methods (hump, valley) were adapted and evaluated.
Efficiency was analyzed as a function of gap height, orientation, diffraction modes, and material properties.

Main Results:

The standard rectangular waveguide yielded the highest peak efficiency (92%).
Horn antennas achieved 73% efficiency, while prism coupling reached 60%.
Novel hump and valley techniques showed lower efficiencies (35% and 12%, respectively).
Grating techniques varied, with thin strips at 30% and gapped bars at 26% efficiency.
Coupling efficiency strongly depended on gap height, especially for prism and grating couplers.

Conclusions:

Standard rectangular waveguides are the most efficient method for coupling surface electromagnetic waves onto aluminum at the studied microwave frequency.
Prism and grating coupling efficiencies are sensitive to gap height and configuration.
Dielectric grating bars are less efficient than metallic alternatives.
Optimal prism coupling occurred at a gap distance of approximately one wavelength.