Low Profile Integrated GPS and Cellular Antenna
In recent years, the rapid decrease in size of personal communication devices has lead to the need for more compact antennas. At the same time, expansion of wireless systems has increased the applications for multi-functional antennas that operate over broad frequency bands or multiple independent b...
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Virginia Tech
2014
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| Online Access: | http://hdl.handle.net/10919/35683 http://scholar.lib.vt.edu/theses/available/etd-11132001-145613/ |
| Summary: | In recent years, the rapid decrease in size of personal communication
devices has lead to the need for more compact antennas. At the same
time, expansion of wireless systems has increased the applications for
multi-functional antennas that operate over broad frequency bands or
multiple independent bands. The civilian GPS system is quickly
becoming the standard for personal and commercial navigation and
position location. The difficulty with GPS is that there is no return
link. That is, a GPS terminal determines its position, but that
position is known only to the terminal user. A return link enables
positional information derived from GPS to be communicated to a remote
location. This is especially desirable for unmanned terminals. The
next wide scale technology area for GPS is the integration of a GPS
receiver with some type of wireless service to provide communication
of the GPS - derived position as well as messaging. One of the most
popular uses for this service is tracking of mobile cargo.
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This paper presents a design for a compact, low-profile antenna that
operates at both the conventional cellular telephone band of 824 to
894 MHz and the civilian GPS L1 frequency of 1575 MHz. The combined
antenna unit has a lateral diameter of less than 4 inches (10 cm) and
its height is less than 2 inches (5 cm). The integrated unit is a
hybrid design of two collocated antennas that operate at the two
different bands. The planar inverted F antenna, PIFA, meets the
specifications which are required in a reduced size environment. The
PIFA is capable of achieving a bandwidth of 8% in the cellular band.
The GPS portion of the hybrid unit consists of a dielectrically loaded
patch located in a "piggyback" configuration on top of the top PIFA
element.
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Computer simulation and design were performed using a combination of
IE3D, a 2.5 dimensional commercial moment method code, and Fidelity, a
commercial full 3D finite difference time domain code. Results will be
presented from these calculations along with measurements on prototype
antennas using both the Virginia Tech outdoor antenna range and the
Virginia Tech near-field antenna range. === Master of Science |
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