This letter introduces the compact design of triple-band circularly polarized quadrifilar helix antennas (QHAs) possessing the characteristics of wide beam, high gain at the low elevation, and high stability of the phase center. The available triple-band operation is achieved through the incorporation of a UHF-band QHA and an L/S-band QHA, which are assembled in a “piggyback” fashion. The UHF-band QHA is fed by a compact microstrip feed network, while the L/S-band QHA is fed by a split coax balun. The measured results coincide well with the simulated ones, which verified the effectiveness of the proposed compact design .