A dielectric waveguide for propagating electromagnetic signals comprises a cladding member (102) extending a length between two ends (104). The cladding member is formed of an intermediate dielectric material. The cladding member defines a core region (114) that extends through the cladding member along the length of the cladding member. The core region is filled with a central dielectric material having a dielectric constant value that is less than a dielectric constant value of the intermediate dielectric material. A jacket member (126) engages and surrounds the cladding member along the length of the cladding member. The jacket member is formed of an outer dielectric material having a dielectric constant value that is less than the dielectric constant value of the intermediate dielectric material.