Microstrip reflectarray antenna with offset feed
Abstract
Theoretical analysis and experiment are employed to study focusing by planar patch array with schematically distributed phase delay provided by a microstrip delay line. The concept of a microstrip reflectarray antenna uses a feed antenna located so that it effectively illuminates all the patches. Fraunhofer aperture integration is used to derive the equations for the far-field pattern and the beam-focusing direction. A circular patch array with 2828 linearly polarized elements is tested in terms of phase variation in the aperture plane, co- and cross-polarization in the E and H planes, antenna gain, and overall efficiency. Antenna efficiency can be maximized by optimizing the placement of patch elements, and beam scanning permits the construction of multiple beams by multiple feeds. The concept is shown to be effective for focusing by means of planar patch array with a schematically distributed phase delay based on the use of a microstrip delay line.
- Publication:
-
Electronics Letters
- Pub Date:
- July 1992
- DOI:
- 10.1049/el:19920946
- Bibcode:
- 1992ElL....28.1489C
- Keywords:
-
- Antenna Arrays;
- Antenna Feeds;
- Microstrip Antennas;
- Phase Shift;
- Reflector Antennas;
- Cross Polarization;
- Transmission Lines;
- Communications and Radar