High isolation dual-frequency patch antenna integrated with cascade defected microstrip structure
This article presents a high-isolation dual-frequency rectangular patch antenna utilizing microstrip feed line integrated with a cascade defected microstrip structure (CDMS). Two types of CDMS are added, T-shaped CDMS and Dumbbell-T-shaped CDMS. Simulation results show using these structures improve isolation up to 70 dB and reduce harmonic signals from transmitter.  2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2011.
high isolation cascade defected microstrip structure dual frequency patch microstrip antenna