@article{PATENT,
      recid = {8490},
      title = {Millimeter wave sensor for on-line inspection of thin  sheet dielectrics},
      number = {PATENT},
      month = {Mar},
      year = {1999},
      abstract = {A millimeter wave sensor is provided for non-destructive  inspection of thin sheet dielectric materials. The  millimeter wave sensor includes a Gunn diode oscillator  (GDO) source generating a mill meter wave electromagnetic  energy signal having a single frequency. A heater is  coupled to the GDO source for stabilizing the single  frequency. A small size antenna is coupled to the GDO  source for transmitting the millimeter wave electromagnetic  energy signal to a sample material and for receiving a  reflected millimeter wave electromagnetic energy signal  from the sample material. Ferrite circulator isolators  coupled between the GDO source and the antenna separate the  millimeter wave electromagnetic energy signal into  transmitted and received electromagnetic energy signal  components and a detector detects change in both amplitude  and phase of the transmitted and received electromagnetic  energy signal components.},
      url = {http://knowledge.uchicago.edu/record/8490},
}