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Compact Co-Planar Dual-Band Microstrip
Patch Antennas for Modernized GPS
October 2009
B. Rama Rao, The MITRE Corporation
E. N. Rosario, The MITRE Corporation
Mohamed S. Mahmoud, The MITRE Corporation
Jay I. Simon, The MITRE Corporation
ABSTRACT
A new navigational signal designated as L5 with a center
frequency of 1176 MHz and a bandwidth of 20 MHz has
been introduced as part of GPS Modernization. This new
signal is in the Aeronautical Radio Navigation Service
Band and will primarily benefit aviation users by allowing
precision navigation when used with the existing L1 signal
for ionospheric corrections. In addition, U.S. military
users will be primary beneficiaries of the new M code
signal with a bandwidth of 24 MHz introduced into the L1
and L2 bands. The unique feature of this code is its
spectral separation from the civil signals in these two
bands. New antennas will be needed to support both civil
and military users of a modernized GPS system when it
becomes fully operational. The L1/L5 antenna used in
avionics has to meet stringent size and performance
requirements imposed by the RTCA. Military antennas
also need to have adequate bandwidth and gain to allow
high fidelity reception of M code signals. This paper
describes two new microstrip antenna designs for very
compact, co-planar dual-band antennas suitable for
operation in either the L1/L5 bands for civil avionics
applications or in the L1/L2 bands for use in small CRPA
antenna arrays used for military applications. Both
antenna designs meet their expected performance
requirements and offer significant advantages over
conventional GPS microstrip antenna designs that are
currently being used.
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