A STEERABLE ARRAY ANTENNA USING CONTROLLABLE 4-BIT DIELECTRIC SLAB PHASE SHIFTERS ON A COPLANAR WAVEGUIDE AT 24 GHz

摘要

A steerable antenna using a movable dielectric phase shifter is designed and developed. The change of the effective dielectric constant at different dielectric slab positions on a CPW is used as the phase shifter. The impedance matching and desired phase shift conditions are satisfied at two slab heights. Additionally, the reflection is designed to be minimized at these slab positions and at the designed frequency. A low-loss dielectric material is used as the dielectric slab and is placed close to a coplanar transmission line with an airgap. A tapered 8 × 7 steerable array antenna with phase shifters is designed and fabricated at 24 GHz. The E- and H-plane radiation patterns are measured at different phase shift positions and compared with the expected results.