Patch-Helix Hybrid Antenna

[Admin 2425]

The helical antenna is a hybrid of two simple radiating elements, the dipole and loop antennas. A helix becomes a linear antenna when its diameter approaches zero or pitch angle goes to 90º. On the other hand, a helix of fixed diameter can be seen as a loop antenna when the spacing between the turns vanishes (α = 0º ) . Helical antennas have been widely used as simple and practical radiators over the last five decades due to their remarkable and unique properties. The rigorous analysis of a helix is extremely complicated for Circularly Polarized Patch-Helix Hybrid Antenna with Small Ground.

 

 

Helical antenna calculator...http://jcoppens.com/ant/helix/calc.en.php

[Admin 2425]

A new design of circularly polarized (CP) patch-helix hybrid antenna with small ground is presented. The proposed antenna consists of a driven patch, a parasitic patch, and a helix connected with the parasitic patch. The hybrid antenna has a relatively small ground, making the overall antenna compact. The proposed antenna can be packaged in a thin cylinder and can be easily mounted in the space-limited systems. Good impedance matching was achieved by capacitive coupling between the driven patch and the parasitic patch, while high gain was obtained with a small ground due to relatively uniform current along the helix.