The sinuous microstrip antenna

Multioctave microstrip antennas recently developed by the authors (1990) for a spiral geometry have been extended to a sinuous geometry with good performance over a 5:1 bandwidth. The motivation for using the sinuous configuration is to achieve polarization diversity. Dual linear polarizations or dual circular polarizations can be obtained from a single sinuous antenna. Other desirable performance improvements over the loaded-cavity configuration of the sinous antenna, such as that of antenna gain, were also achieved. Measured results are presented which show that the sinuous microstrip antenna is capable of performance similar to that of the spiral microstrip antenna over a multioctave bandwidth with polarization diversity.<>