winding at l � 0.5 � and � � 45 � at 3.64 GHz. ����� � LHCP of the QHA with parasitic strips, ����� � LHCP of the QHA without parasitic strips, � � RHCP of the QHA with parasitic strips, —— RHCP of the QHA without parasitic strips use of a parasitic copper strip QHA is still under investigation. 4. CONCLUSIONS A novel QHA with a second parasitic QHA is proposed and intensively studied. It is found that the return loss can be reduced from �28 to �47 dB, and the impedance bandwidth Ž with SWR � 2. can be broadened to 39%. The bandwidth with circular polarization can also be significantly increased. The HPBW of the radiation pattern can be increased from 53 to 68�. This compact antenna is ready for use in mobile satellite communications
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