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GPS Antenna Types: The GPS antenna is essentially a signal amplifier.
The antenna improves the received GPS signals for transmission
along a cable to a receiver for decoding. A Coax Cable is normally
used to transfer signal information between the GPS antenna and
receiver. These antennas can be provided in different shapes and
sizes. The general antennas being pole-mounted are dome shaped
antennas and small patch type antennas. The pole-mounting
antenna screws onto the threaded pole for mounting. Whereas the
patch type antenna is a small flat bottomed device ideal for
mounting on a windowsill.

The role of the antenna is to filter, amplify and down-convert the
incoming signals into an electric signal that can be processed by the
receiver electronics wintin the RF section. The basic functions of the
antenna preamplifier are to increase incoming signal power level to
overcome cable attenuation between antenna and receiver, reject
signal interference through appropriate filtering, convert the L-band
signals to an intermediate frequency to reduce cable signal losses.
There are a number of special considerations as far as GPS antenna
design is concerned:
* The antenna must be able to pick and discriminate very weak
signals (the signal strength is approximately the same as those
from geostationary TV satellites).
* The antenna may need to operate at just the L1 frequency, or at
both the L1 and L2 frequencies.
* As the signals are circularly polarised, the GPS antenna must also
be circularly polarised.
* The antenna gain pattern design typically is intended to enhance
the ability of the RF section to filter multipath and low elevation
signals.

gps antenna

* An essential requirement is a stable electrical centre which is
coincident with the geometric centre and insensitive to the rotation
and inclination of the antenna, and if this cannot be achieved then
the offset parameters should be known to a suitable accuracy (sub-
centimetre in the case of survey grade GPS antennas).
* The construction of the antenna consists of: (a) the omnidirectional
antenna element, (b) the antenna preamplifier electronics, and (c) a
groundplane (though not always present).

The U-Series antenna offers a new level of protection for magnetic
GPS antennas: IP67 waterproof compliance. These antennas remain
waterproof after 30 minutes in 1m of water. The U-Series is your
choice if you use GPS in a watery environment. These antennas are
available with gains from 12dB to 35dB. Some models offer 2.7V to
6V operating voltage and low current consumption from 2mA to
13mA. Stainless steel screws are used to prevent corrosion and a
foam cushion is provided to prevent scratching.

Magnetic antennas are one of the most versatile antennas used for
GPS applications. However, they are best suited for navigation and
tracking applications. These antennas can be placed on top of a
vehicle's roof, on the front or back dashboard, and even under the
dashboards. Some are even small enough for covert applications.
The M-Series GPS antennas can do this and more. With available
gains of 27dB, 20dB, or 12dB and operating voltage from 2.7V to 6V,
the M-Series antennas are suitable for a variety of applications and
a wide range of GPS receivers. These antennas can also be used for
portable or battery-powered applications since their current
consumption can be as low as 2mA. Higher gain antennas are also
available if you require a very long cable or if your receiver requires
a high gain antenna.

Combination antennas offer you the convenience of two antennas
in a single package. Therefore, you only need to install one antenna.
These antennas are well suited for mounting onto trucks, vans,
maintenance vehicles, etc.

GPS/Quadband Antennas, an antenna for your GPS, cellular, and
Wi-Fi applications. All this in one compact size. Four models with
three mounting options from which to choose: Magnetic, Roof-mount,
or Window-mount.

GPS/Triband Antennas - with triband antennas, one antenna
installation covers GPS, AMPS, CDMA, GSM, Mobitex, PCS, and GPRS
in a compact size.

Dualband Antennas - if you do not require a triband antenna, then
the dualband antenna is the choice for you. Depending on your
requirement, one antenna covers GPS and AMPS, CDMA, iDEN,
Mobitex or GSM.

Roof-mount GPS Antennas - made with a metal base, these antennas
are perfect for permanent installations. The antenna is only 0.5"
(13mm) after installation and the cable is hidden under the mounted
surface. This makes the antenna less likely to draw attention and
difficult to disable.

The low-cost GPS and cellular antenna bundled set is comprised of
the ACCTC dualband antenna with a magnetic GPS antenna. Separate
GPS and cellular antennas offer you flexibility in installation and allows
for optimum performance of both antennas. The GPS and cellular
antennas are smaller in size compared to a combination antenna.
Thus, there are more places for you to install the antennas within a
vehicle.

OEM antenna modules are used for embedded applications. These
antennas are placed within your plastic housing. Whether it is
another antenna housing or a box with your other electronics
components, we can supply you with an OEM antenna module right
for you. OEM antenna modules have specifications similar to the
magnetic and through-hole antennas, however, they are not as
simple to use. Various factors, such as frequency shift, must be
taken into consideration to ensure that the antenna will work
properly within your housing.

Passive GPS antennas are inexpensive ways to receive a GPS signal.
In years past, active GPS antennas were the antennas used for most
applications. With the development of very sensitive GPS receivers
for portable applications, the utilization of passive GPS antennas has
increased dramatically. These antennas are typically placed within a
housing and near a receiver. However, passive GPS antennas with
short cables can now be found for portable applications such as cell
phones.


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