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This antenna has been designed for the synthetic aperture radar (SAR) application. It radiates fan-like radiation pattern with specified beamwidth in principal planes in order to achieve optimal parameters for SAR resolution. The feature of this antenna is the combination of slotted waveguide and the E-plane horn. The antenna has been also optimized for low sidelobes. 
Fig. 1. X-band slotted waveguide antenna
Antenna Characteristics
| Operating bandwidth, GHz | 0.4 (in X-band) |
| Beam type | fan |
| 3dB beam width (E-plane x H-plane), deg | 40 x 10 |
| Polarization | Linear/Vertical |
| Side lobes level, dB | <-20 dB |
| Gain, dBi | >19.5 |
| VSWR | <1.2 |
| Dimensions (Aperture), mm | 200 x 60 |
| Height, mm | 57 |
| Weight, kg | 1 |
Another modification of X-band slotted-waveguide fed horn antenna is available. It has a twice narrower beamwidth in H-plane. Appearance of the antenna is shown in Fig.2. The antenna can be equipped with the radome that provides slots protection from the environment (see Fig.3). Output connectors as WR-90 waveguide or SMA caxial connector are optionally available for this antenna.
Fig. 2. X-band slotted waveguide antenna without radome
Fig. 3. X-band slotted waveguide antenna with radome
Specification of the antenna are given in the Table below.
Antenna Characteristics
| Operating bandwidth, GHz | 0.2 (in X-band) |
| Beam type | fan |
| 3dB beam width (E-plane x H-plane), deg | 40 x 5 |
| Polarization | Linear/Vertical |
| Side lobes level, dB | <-20 dB |
| Gain, dBi | >21.5 |
| VSWR | <1.2 |
| Dimensions (Aperture), mm | 380 x 70 |
| Height, mm | 60 (for the waveguide connector) |
| Weight, kg | 2 |