@article{
  author = {Heidari, A. A.},
  title = {Design and Implementation of a Circularly Polarized Microstrip Patch Antenna for GPS Application with Input VSWR Tuning Capability},
  journal = {Nashriyyah -i Muhandisi -i Barq va Muhandisi -i Kampyutar -i Iran},
  year = {2007},
  volume = {5},
  number = {3},
  pages = {168-172},
  doi = {}
}