Short notes for Helical antenna?

A helical antenna is an antenna consisting of a conducting wire wound in the form of a helix. In most cases, helical antennas are mounted over a ground plane. The feed line is connected between the bottom of the helix and the ground plane. Helical antennas can operate in one of two principal modes — normal mode or axial mode.

                                          Fig:Helical  antenna
                                 

The most popular helical antenna (helix) is a travelling wave antenna in the shape of a corkscrew that produces radiation along the axis of the helix antenna. These helix antennas are referred to as axial-mode helical antennas. The benefits of this helix antenna is it has a wide bandwidth, is easily constructed, has a real input impedance,
Helix antennas for satellite communications

We offer a unique set of helix antennas for satellite communications. Our helix antennas operate across several satellite networks including GPS, Iridium and GLONASS. We also offer several antennas that work across multiple networks.

The antennas are available in different sizes and form factors. We produce both external antennas that come in a range of plastic housings, as well as embedded antennas. Our embedded antennas are custom built to sit perfectly in the devices own housing. 
Helical broadcasting antennas
Specialized normal-mode helical antennas are used for FM radio and television broadcasting on the VHF and UHF bands.




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