As shown in figure 5, a handset with monopole type of helix antenna
model was simulated by using CST software.
An electrically small spherical helix antenna
is presented in , which boasts efficiencies of 90% plus; however, the antenna is mounted over an infinite Perfect Electric Conductor (PEC) ground plane and as such cannot truly be considered an ESA.
Each element is a quadrifilar helix antenna
of radius 0.1A and turn spacing 0.2A with two turns and axis parallel to the y-axis.
Round out the list with a high-sensitivity GPS receiver, a quad helix antenna
, a built-in barometric altimeter and 3-axis compass and a glove-friendly color touchscreen.
The use of Quadrifilar Helix Antenna
in space communications is a very suitable choice because of its many excellent characteristics such as front to back ratio, gain and axial ratio.
In addition, the Duo-Touch supports an (optional) integrated high-performance, 12-channel GPS receiver (featuring the same high performance quadrifilar Helix antenna
used on the GoBook III) to enable real-time, accurate location capture for applications such as automated vehicle location (AVL), vehicle routing and mapping, and field asset management.
The nine-buttom keypad gives instant access to nine useful navigation screens, while the WAAS-enabled, 12-channel GPS receiver and quadrifilar and quadtifilar helix antenna
provide superior satellite reception and reliable position fixes as accurate as three meters or better.
With keypad access to seven navigation screens and an easy-to-read display, it includes a 12 parallel-channel GPS receiver and a Quadifiler Helix antenna
. SporTrak Pro is waterproof, and it floats.
There are many CP antenna designs available in the literature with very good performance, such as helix antenna
, conical log spiral antenna or skew-planar wheel antenna.
Quadrifilar helix antenna
[2-4] has many advantages, such as cardioid shaped pattern with excellent CP coverage, good axial ratio, simple structure, light weight and low cost, which make it a very attractive candidate for global positioning system application.