Patent ID: 7948358

Claim:
A vehicle anti-theft system including an immobilizer system and a keyless entry system provided adjacent to a key cylinder, said anti-theft system comprising: an annular member mounted around a key opening of the key cylinder; a housing integrally connected to the annular member and retaining a printed circuit board containing circuitry for both the immobilizer system and keyless entry system; an immobilizer system antenna incorporated in and extending around the annular member and connected to an electric circuit in the printed circuit board; and a keyless entry system antenna provided in the housing and connected to an electric circuit in the printed circuit board; wherein the housing is mounted on the key cylinder and includes a bottom wall extending along a side of the key cylinder, and a portion of the keyless entry system antenna extends in parallel with the bottom wall and wherein the immobilizer system antenna and the position keyless entry system antenna are spaced apart from one another and are arranged in a non-parallel configuration; wherein the housing further includes a side wall extending perpendicularly from the bottom wall; wherein the keyless entry system antenna includes a portion extending in parallel with the side wall.