The solutions to the Rotman lens design equations constrain the minimum size of the device. Here we use
Transformation Optics to compress a transmission line based Rotman lens by 27 percent along the optical axis
while maintaining the beam steering range, gain and side lobe amplitudes over the full frequency range of the
original lens. The transformation applied requires an anisotropic magnetic response, which is achieved in the
transmission line context using complementary electric dipole structures patterned into the top conductor of
the lens. The non-resonant complementary metamaterial elements provide an anisotropic, eective magnetic
permeability with values that can be varied across a spatial region by varying the geometry of each element.
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