Vivaldi-antenna

Vivaldi-antenna

A Vivaldi-antenna is a co-planar broadband-antenna, which is made from a on both sides metallized dielectric plate.The feeding line excites a circular space via a microstrip line, terminated with a sector-shaped area.From the circular resonant area the energy reaches an exponential pattern via a symmetric slot line.

Vivaldi antennas can be made for linear polarizated waves or - using two devices arranged in orthogonal direction - for transmitting / receiving both polarization orientations.

If feeded with 90deg phase shifted signals orthogonal devices can transmit / receive circular oriented electromagnetic waves.

Vivaldi antennas are useful for very high frequencies exceeding 3GHz.

Advantages of Vivaldi antennas are their broadband characteristics (suitable for ultra-wideband signals), their easy manufacturing process using common methods for PCB production, and their easy impedance matching to the feeding line using microstrip line modelling methods.

The MWEE collection of EM simulation benchmarks includes a Vivaldi antenna [http://www.cst.com/Content/Applications/Article/15] [http://www.mwee.com/magazine/2000/cad_benchmark.html] .


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