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Compact 2 x 2 Coupled Double Loop GPS Antenna Array Loaded With Broadside Coupled Split Ring Resonators

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3 Author(s)
Gheethan, A.A. ; Dept. of Electr. Eng., Univ. of South Florida, Tampa, FL, USA ; Herzig, P.A. ; Mumcu, G.

The design and nulling capability of a compact 2 × 2 dual-band coupled double loop (CDL) GPS antenna array loaded with broadside coupled split ring resonators (BC-SRR) are presented. The high level of L2 band mutual coupling is reduced by utilizing -negative (MNG) BC-SRR metamaterial within the array volume. This metamaterial loading is possible due to the small L2 band electrical size (λo / 8.5 × λo / 8.5) of the CDL antenna elements. Different than the existing work on coupling reduction of linearly polarized antenna arrays, mutual coupling mechanism within the circularly polarized GPS array is considered and MNG metamaterials are shown to reduce the mutual coupling if they are placed between the antennas in a particular alignment. Specifically, a 2 × 2 array with inter-element spacing is designed to be loaded with BC-SRRs and experimentally verified to exhibit a 10 dB L2 band mutual coupling reduction. Through simulations and experiments, it is also demonstrated that the reduction in L2 band mutual coupling improves the L2 band array nulling capability in terms of accuracy and null depth without affecting the already well-behaved L1 band performance. The presented array has an overall footprint size 4.3" × 4.3" of and can be potentially miniaturized further for different inter-element spacing.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:61 ,  Issue: 6 )

Date of Publication:

June 2013

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