In modern wireless communication systems, the transmission of 5G signals is substantially attenuated by obstacles, resulting in indoor receivers not receiving signals at all. To overcome this thorny problem, a novel Zn0.97Co0.03Mo0.92W0.08O4 ceramic material with excellent microwave dielectric properties (εr = 8.432, Q × f = 64096 GHz, τf = -41.9 ppm/°C) sintered at 850 °C is developed by the solid-state reaction method. For the first time, an all-ceramic array patch for 5G signal enhancement is designed and demonstrated using this ceramic. This all-ceramic-based device not only effectively avoids the problem of matching co-fire between metal electrodes and ceramics, but also compensates for the attenuation loss of 5G signals in the wall. The intensity of the 5G signal is greatly improved from 0.02 to 1.62 by the focusing effect of the device. This function is verified by the intensity and phase of the near-field electric field. This work provides a new idea for the design of all-ceramic-based LTCC devices and broadens the application of microwave dielectric ceramics.