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Standing Waves in a Cavity

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Tunable band-notched coplanar waveguide based on localized spoof surface plasmons.

Bingzheng Xu, Zhuo Li, Liangliang Liu

|October 16, 2015

Summary

This study introduces a novel band-notched coplanar waveguide (BNCPW) using spoof surface plasmon polaritons (SSPPs). This design enables flexible and independent control over stopband frequency and absorption for microwave and terahertz devices.

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Area of Science:

Electromagnetics
Metamaterials
Waveguide Technology

Background:

Coplanar waveguides (CPWs) are fundamental transmission lines.
Spoof surface plasmon polaritons (SSPPs) offer unique waveguiding properties at subwavelength scales.
Existing band-notch solutions can be complex and lack tunability.

Purpose of the Study:

To propose a simple and tunable band-notched coplanar waveguide (BNCPW) structure.
To demonstrate the generation of narrow stopbands using defect units in SSPP structures.
To enable flexible design of band-notched devices for microwave and terahertz applications.

Main Methods:

Integration of an ultra-thin periodic corrugated metallic strip supporting SSPPs with defect units.
Utilizing defect modes within the SSPP bandgap to create localized spoof surface plasmons (LSSPs).
Theoretical analysis and experimental validation of the proposed BNCPW design.

Main Results:

Successful generation of narrow stopbands by introducing defect units into the SSPP strip.
Independent tunability of stopband center frequency and absorption level by adjusting defect unit dimensions.
Demonstration of the BNCPW's effectiveness for band-notched functionality without external filters.

Conclusions:

The proposed BNCPW offers a simple, flexible, and efficient method for creating band-notched functionalities.
This approach facilitates the design of compact and reconfigurable antennas and devices in microwave and THz regimes.
The localized nature of SSPPs around defects allows for precise control over filtering characteristics.