The invention provides a small-size three-in-one multi-frequency
ceramic antenna which comprises a
ceramic substrate, wherein two ends of the
ceramic substrate are connected with a first
frequency band antenna part and a second
frequency band antenna part respectively, and the distance between the other end of the first
frequency band antenna part and the other end of the second frequency band antenna part is very small to enhance
coupling between the first frequency band antenna part and the second frequency band antenna part, produce good
resonance, and improve isolation. The first frequency band antenna part and the second frequency band antenna part are connected with a communication module to receive video signals of different frequency bands, and a third frequency band antenna part is arranged between the first frequency band antenna part or the second frequency band antenna part and the communication module to receive radio-frequency signals of a third frequency band. A
metal sheet and two grounding parts are arranged below vertical projections of the first frequency band antenna part and the second frequency band antenna part on the
ceramic substrate, one end of each grounding part is connected with the
metal sheet in a welded mode, the other end of each grounding part is grounded, the isolation is improved, and the
resonance is regulated. The small-size three-in-one multi-frequency ceramic antenna can be used in two or more than three frequency bands, and the isolation among all the frequency bands is good.