Title :
A compact single layer injection-locked linear scanning array
Author :
Ip, Kenneth H Y ; Eleftheriades, George V.
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada
Abstract :
A compact, single layer, CPW-fed, patch scanning array architecture using injection locking at 9.83 GHz is presented. The patch antennas are printed on the front side of the substrate while the electronics are situated at the back side leading to a simple and compact design. The unit element for the array is a self oscillating active patch antenna with a GaAs FET centered behind the patch for tight packing. The feedback for the oscillator is provided through electromagnetic coupling using a twin-slot arrangement behind the patch. A low power control signal is injected through parasitic coupling at the CPW side of the circuit. Phase shifting of the elements is achieved by electronically adjusting the gate voltage of the GaAs FETs. A scan range of -12/spl deg/- +9.5/spl deg/ is obtained for a four element prototype array.
Keywords :
active antenna arrays; antenna feeds; antenna phased arrays; antenna radiation patterns; coplanar waveguide components; electromagnetic coupling; field effect transistors; gallium arsenide; linear antenna arrays; microstrip antenna arrays; scanning antennas; 9.83 GHz; CPW-fed patch array; EM coupling; GaAs; GaAs FET; beam scanning array architecture; compact patch scanning array architecture; element phase shifting; feedback; four element prototype array; gate voltage adjustment; injection locking; low power control signal injection; parasitic coupling; phased arrays; self oscillating active patch antenna; single layer patch scanning array; twin-slot arrangement; Antenna arrays; Coupling circuits; Electromagnetic coupling; FETs; Feedback; Gallium arsenide; Injection-locked oscillators; Linear antenna arrays; Patch antennas; Power control;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/7260.975720
