Design Goals:

-  Compact Phased Array System
-  Multibeam Capabilities
-  Independent Polarization Control
-  Ease of Integration
-  Robust and Low Cost
-  Broadband, 34 to 40 GHz
-  High Resolution Imaging

System Configuration for Receiver:

-  Individual circuitry for the vertical and horizontal polarizations allow for independent control.
-  Dual polarized horn antennas with orthogonal fed waveguides to discriminate the polarization.
-  Rotman lens serves as phase shifting network.
-  Beam control circuitry consisting of switches and LNA.
















Phased Array Architecture:

-  Low profile tray configuration.
-  Independent control of horizontal and vertical polarizations through the top and bottom of the trays.
-  Double sided tray architecture.
-  1x10 linear array of horn antennas is connected to the 10 array ports of the Rotman lens.
-  Attenuating absorbing ports on sides of lens.
-  Eight beam ports are connected to the SP8T PIN diode switch with LNA.





















Miniature Horn Antenna Design with Waveguide Feeds:

-  Waveguide and horn sections fabriacted through stereolithography.
-  L-shaped waveguide for vertical polarization.
-  Straight waveguide for horizontal polarization.
















Radar Detection Processing:

-  Concurrent communication to/from the microcontroller, PC, and the network analyzer.
-  Microcontroller provides the necessary TTL voltages to the comparators for the beam controlling circuitry.
-  High resolution due to the broadband capabilities of the phased array.
-  Through electronically controlled beam steering, the responses for each beam are processed to form a two dimensional image.
-  Additional phase information from each tray allows for the formation of a three dimensional image.
















Real Time Scanning of Scene:

-  Targets of different radar cross sectional areas placed at various locations.
-  Image is updated after sweeping through all beam angles.