Omnidirectional GPS antenna
Omnidirectional GPS antenna. The antenna operates in band 1575.42 MHz. In combination with integrated amplifier, this active antenna achieves gain of up to 24 dBi in GPS band. It is suitable for use in cars and other vehicles.
A patch antenna is composed of a dielectric or semiconductor substrate and a conductive microstrip. It is produced similarly to printed circuits. The main disadvantages of these antennas are their narrow bandwidth, lower gain and limited power load bearing capacity. One of the possibilities to achieve better performance of this antenna is a variant with a lower (conductive) continuously plated layer. This improvement partially functions as a reflector, so by limiting the radiation from the bottom side we increase the directivity of the antenna and at the same time its gain in the desired direction. The efficiency of the antennas ranges roughly from 35 to 90 %. The operating frequency (of oscillation) ranges from hundreds of MHz to tens of GHz, generally not exceeding 30 GHz. It is used in mobile phones, RFID readers and anywhere where an antenna needs to be placed in a very small device. Some of the advantages are a relatively high efficiency and low impedance, miniature size and the possibility of mass production. The antennas are thin, lightweight and relatively easy to construct, and because they can withstand extreme conditions and are manufactured in any shape, they can be mounted on the outside of cars or aircraft. This type of directional antenna is also suitable for small single-storey office buildings, shops and many other indoor locations where a central access point is not available. The patch antenna can be also used as an external antenna to increase signal reception and for data transmission from wireless devices such as GPS systems.
More information can be found in the attached datasheet.