CST – Computer Simulation Technology

Cavity-Backed Annular Slot Antenna

Image of the cavity-backed annular slot antenna. Image of the cavity-backed annular slot antenna.

The cavity-backed annular slot antenna is often used in airplane applications, as it can be flush-mounted so that it has little impact on the aerodynamic performance of the platform. The structure has an air-filled cavity backing (designed to support the dominant TE010 mode), while a shorting strip (bridging the slot separating the central disc and remaining ground plane) can increase the impedance bandwidth of the structure to beyond 10%.

The S11 figure highlights the effect which the short and short angular position has on the impedance response. When angle alpha is smaller than 90 degrees a single resonance is present, whereas when the angle is increased beyond 90 degrees, a dual resonance occurs which dramatically increases the bandwidth.

is smaller than 90 degrees a single resonance is present, whereas when the angle is increased beyond 90 degrees, a dual resonance occurs which dramatically increases the bandwidth.

Typical radiation pattern at the center frequency. Typical radiation pattern at the center frequency. Typical S11 performance of the antenna. Typical S11 performance of the antenna.

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