A polishing composition of the present invention includes alumina, colloidal silica, citric acid, an organic acid other than citric acid, an oxidizing agent, and water. The lobe structure is made of a ceramic matrix composite material and further comprises a stiffener ring that forms a connection between at least some of the lobes of said structure. Furthermore, the third port is connected both to a power detection port at the radio unit and to the wake-up unit, such that during a first mode of operation, a part of a signal that is transmitted from the radio unit to the antenna is coupled from the second port to the third port and further fed to the power detection port. The conditioning apparatuses are placed in the second portion.