Required Specification:
Transmit Frequency: 31.2-32.8GHz
Gain: 15 dBi
3 dB Beam width: E plane ±90°， H plane ±7.5°
Transceiver Channel Isolation： ＞40dB
1.Technical Specification Required
| Item | Parameter | Specification |
| 1 | Frequency | 31-33GHz |
| 2 | Antenna face diameter | 66mm*16mm*4mm |
| 3 | Antenna elevation angle | 65°±1° |
| 4 | Beam width | E plane ±95°, H plane 15°±1° |
| 5 | Gain | @±90 ＞8.5dBi |
| 6 | Side lobe | <-22dB |
| 7 | Transcevier isolation | >55dB |
2.Technical Solution
On the basis of keeping the physical structure of the original scheme unchanged, the receiving and transmitting are still designed with back-to-back dual antennas respectively. The coverage of a single antenna is ±100°, the minimum gain of a single antenna is 8.5dBi@90°, and the pitch angle between the antenna beam and the missile axis is 65°. The sub-antenna is a wave-guide slot antenna, and the feed network performs amplitude and phase weighting to meet the requirements of the side-lobe envelope and elevation angle.
Radiation Performance
The combined patterns of single antenna and dual antennas were simulated respectively. Due to the superposition of backward radiation, the combination of double antennas will cause irregular zero depth, while the single antenna has a smooth radiation pattern in the range of ±90° azimuth. The gain is the lowest at 100°C, but all are greater than 8.5dBi. The isolation between the transmitting and receiving antennas under the two excitation modes is greater than 60dB.
1.65 Degree Elevation Pattern (Gain)
31GHz, 32GHz, 33GHz dual antenna synthesis 65° elevation angle 360° azimuth pattern
31GHz, 32GHz, 33GHz single antenna 65°elevation angle 360°azimuth pattern
1.3D Pattern with 65 Degree Elevation Angle (Gain)
Synthesized 65° elevation pattern with dual antennas
Single antenna excitation 65° elevation pattern
Dual antenna synthesis 3D pattern
Single antenna excitation 3D pattern
1.Pitch Plane Pattern (Side Lobe) First Side Lobe<-22db
31GHz, 32GHz, 33GHz Single antenna 65° elevation angle pattern
Port standing wave and transceiver isolation
VSWR<1.2
Transceiver isolation<-55dB
