Intensity measurement based temperature independent strain sensor using a highly birefringent photonic crystal fiber loop mirror, Opt Commun 283 (2010), 5250-5254. 13. C.-L. Zhao, L. Xiao, J. Ju, M.S. Demokan, and W. Jin, Strain and temperature characteristics of a LPG written in a photonic crystal fiber and its application as a temperature-insensitive strain sensor, J Lightwave Technol 26 (2008), 220-227.ABSTRACT: The use of E 11 x mode in an insulated image guide is proposed. This mode has much lower conductor loss than the fundamental, E 11 y mode. The electric field of the mode is primarily parallel to the metal ground-plane; therefore, the mode can be efficiently excited with a compact dipole structure oriented parallel to the ground-plane. When the insulating layer is of low permittivity and relatively thick, the E 11x mode exhibits the highest effective permittivity (largest propagation constant) of all modes. This reduces unwanted mode coupling at discontinuities. Two example structures, a straight line and a double-bended line are measured at frequencies around 8 GHz. The excitation of the waveguide causes insertion loss of less than 0.4 dB, and the radiation loss of the bends and the waveguide itself appears to be negligible.