Coupling reduction of coupled double loop GPS antennas using split ring resonators

We utilize broadside coupled split ring resonators (BC-SRRs) for reducing the mutual coupling between two closely spaced miniature coupled double loop (CDL) antennas to improve their performance when employed in miniature anti-jam GPS arrays. The CDL GPS antenna elements have a physical size of 1.1" × 1.1" and operate in the L₂ and L₁ bands with measured 5.8dB and 2.8dB gains, respectively. The BC-SRRs were designed to suppress their L₂ band mutual coupling by effectively realizing a homogenous medium that could be characterized with negative permeability. Stacks of BC-SRRs were strategically placed between the 1.1" (i.e. ~λ₀/9) separated CDL antennas to maximize their interaction with the L₂ band magnetic field distribution. Preliminary computational studies demonstrate that the approach can provide >;5dB reduction in L₂ band coupling.