CST – Computer Simulation Technology

Wire Quadrifilar Helix Self Phased Backfire

Image of the Wire Quadrifilar Helix self phased backfire. Image of the Wire Quadrifilar Helix self phased backfire.

The self-phased backfire QHA has typical application in areas such as satellite communications, as it radiates a cardioid-shaped beam – something very desirable for ground-based GPS receivers. The antenna is similar in structure to the standard self-phased QHA already available in Antenna Magus, but is designed to achieve a backfire radiation pattern.

This backfire QHA is often mounted on top of a supporting post - which may be formed by the outside of a rigid coaxial feed cable. The feed point is at the top of the structure, with all arms spiraling downward and shorted to the supporting post. Backfire radiation is achieved by the correct phasing between arms.

By careful choice of the length of the spiral arms, a double resonance resulting in a wide impedance bandwidth is possible....

Typical circular gain pattern at the center frequency and detail of the feed connection.< Typical circular gain pattern at the center frequency and detail of the feed connection.

Rate this Article

0 of 5 Stars
5 Stars
0%
4 Stars
0%
3 Stars
0%
2 Stars
0%
1 Stars
0%
contact support

Your session has expired. Redirecting you to the login page...

We use cookie to operate this website, improve its usability, personalize your experience, and track visits. By continuing to use this site, you are consenting to use of cookies. You have the possibility to manage the parameters and choose whether to accept certain cookies while on the site. For more information, please read our updated privacy policy


Cookie Management

When you browse our website, cookies are enabled by default and data may be read or stored locally on your device. You can set your preferences below:


Functional cookies

These cookies enable additional functionality like saving preferences, allowing social interactions and analyzing usage for site optimization.


Advertising cookies

These cookies enable us and third parties to serve ads that are relevant to your interests.