Modern tactical radar architectures operating on airborne gimbals, light ground vehicles, and compact surveillance masts face demanding constraints in size, weight, power, and cost (SWaP-C). Delivering sufficient target acquisition range and electronic counter-countermeasures (ECCM) capabilities without overburdening system thermal or electrical budgets requires an optimized array configuration.
The 64-channel X-band 2D active phased array antenna addresses these requirements by integrating 64 radiating elements into a compact 8×8 planar array layout. Operating across the 9.2 GHz to 10.0 GHz frequency band, the panel generates a specified system EIRP of ≥ 68 dBm with a specified maximum power consumption of ≤ 75 W at a 20% transmit duty cycle. Featuring a built-in 125 MHz intermediate frequency (IF) transceiver network, fast < 60 µs frequency hopping, and ≤ 7 µs beam handover, the array provides a complete front-end solution for medium-scale tactical radar systems.
Technical Specs & Engineering Support
Need complete electrical parameters, S-parameter data, or custom RF design support for this series?
1. 8×8 Array Topology and Architectural Overview
The antenna utilizes an 8×8 planar grid layout designed for high spatial resolution within a compact enclosure. The core hardware integrates the 64-element radiating aperture, T/R phase and amplitude control networks, a monopulse sum-and-difference feed matrix, and a frequency synthesizer directly within a single enclosure featuring a conductive oxide coating inside the RF cavity.
| Functional Subsystem | Integrated Hardware Component |
| Radiating Aperture | 64-Element Active Array (8×8 Grid Layout) |
| RF Subsystems | T/R Phase & Amplitude Control; Monopulse Sum/Diff Feed Matrix |
| Transceiver & Clock | 125 MHz IF Transceiver Chain; Frequency Synthesizer & Clock Generator |
| Power & Control | DC Power Distribution; Synchronous RS-422 Control Bus |
- Physical Footprint: Weighing ≤ 3.0 kg with dimensions of ≤ 220 × 220 × 65 mm, the assembly integrates easily into volume-restricted payload bays and optical/radar gimbals.
- Power Management: Operating off a DC 18V–36V primary bus (nominal +24V DC), the array limits maximum power draw to ≤ 75 W during active transmission at a 20% duty cycle.
- Thermal & Environmental Design: The conductive oxide cavity finish and environmental white primer radome support continuous operation across an ambient temperature range of -40°C to +70°C, subject to system-level thermal design.
2. 125 MHz High-Fidelity IF Transceiver and Reference Clock Dynamics
Unlike conventional phased arrays that require external RF mixing networks, this architecture incorporates a 125 MHz intermediate frequency (IF) transceiver chain that interfaces directly with baseband analog-to-digital converters (ADCs) and digital-to-analog converters (DACs).
- IF Channel Characteristics: The receive path translates incoming X-band signals down to a 125 MHz center frequency with a 30 MHz Linear Frequency Modulated (LFM) signal format. Active Rx channel gain is specified at 35 ± 1 dB with an IF passband flatness of ±0.5 dB over 125 ± 15 MHz. Out-of-band suppression exceeds 25 dB, while mirror and harmonic rejection are maintained at ≥ 60 dB.
- Signal Dynamic Range: The receive path has a channel noise figure of ≤ 12 dB, with an input P1dB of > -5 dBm and an output P1dB of 8 to 10 dBm. Channel isolation across all 64 paths is ≥ 50 dB.
- Phase Noise Profiles:
- Reference Clock Phase Noise: An onboard crystal-stabilized oscillator supplies a 100 MHz sine wave reference clock output (+13 ± 0.5 dBm) to synchronize host baseband processors, exhibiting phase noise of ≤ -150 dBc/Hz at a 1 kHz offset and ≤ -160 dBc/Hz at a 10 kHz offset.
- Transmit/Upconversion Phase Noise: The transmit/upconversion path phase noise is specified at ≤ -94 dBc/Hz at a 1 kHz offset.
3. Beam Steering Agility, Frequency Hopping, and Tracking Performance
Electronic scanning covers a wide two-dimensional field of view, supported by fast T/R phase-latching and frequency agility:
- Azimuth Electronic Scan Envelope: ±50° (Continuous electronic steering)
- Elevation Electronic Scan Envelope: ±30° (Continuous electronic steering)
Steering Agility and Pointing Precision
- Beam Handover Time: Specified at ≤ 7 µs, allowing rapid beam repositioning during interleaved search and multi-target tracking modes.
- Frequency Hopping Time: < 60 µs for a 25 MHz frequency step in the Tx path, enabling effective operation in contested electromagnetic environments.
- Timing Parameter Separation: Beam handover and frequency hopping are specified as separate timing parameters; the ≤ 7 µs beam-handover figure refers specifically to electronic beam steering rather than total frequency-reconfiguration latency.
- Angular Pointing Accuracy: Specified at ≤ 0.15° within the primary ±20° steering cone, and ≤ 0.3° across the full ±50° scan envelope.
- Scan Gain Roll-Off: Azimuth scan loss is ≤ 4.5 dB at ±50°, while elevation scan loss is ≤ 1.75 dB at ±30°.
Beamwidth and Monopulse Characteristics
- Transmit Beamwidth: 11.3° ± 0.6° at center frequency (Azimuth and Elevation).
- Receive Beamwidth: 13.4° ± 0.8° at center frequency (Azimuth and Elevation).
- Receive First Sidelobe Level: < -22 dB at boresight.
- Difference Beam Null Depth: -22 dB typical across both azimuth and elevation channels, supporting monopulse angular-error extraction in both axes.
4. Comprehensive Technical Performance Specifications
The following table summarizes the RF, IF, electrical, and mechanical specifications for system-level evaluation of X-band monopulse tracking arrays:
| Technical Parameter | Specification / Requirement |
| Operating Frequency Band | 9.2 GHz ~ 10.0 GHz (Customizable 25 MHz steps) |
| Array Topology | 64 Elements (8×8 Matrix) |
| Polarization Method | Vertical (Horizontal available upon request) |
| System EIRP (Normal) | ≥ 68 dBm |
| System G/T | ≥ -6.5 dB/K |
| Electronic Scan Range | Azimuth ±50° / Elevation ±30° |
| Angular Pointing Accuracy | ≤ 0.15° (within ±20°) / ≤ 0.3° (within ±50°) |
| Scan Gain Roll-Off | Azimuth: ≤ 4.5 dB / Elevation: ≤ 1.75 dB |
| Tx Normal Beamwidth | 11.3° ± 0.6° (@ center frequency) |
| Rx Normal Beamwidth | 13.4° ± 0.8° (@ center frequency) |
| Difference Beam Null Depth | -22 dB (Typical, Azimuth & Elevation) |
| First Sidelobe Level (Rx) | < -22 dB (At boresight) |
| Transmission Peak Power | ≥ 27 dBm (Single-channel input, design guarantee) |
| Beam Handover Time | ≤ 7 µs |
| Frequency Hopping Time | < 60 µs (Tx path, 25 MHz frequency step) |
| Intermediate Frequency (IF) | 125 MHz (Input / Output) |
| Signal Format & Bandwidth | Linear Frequency Modulated (LFM) / 30 MHz |
| Transmit/Upconversion Phase Noise | ≤ -94 dBc/Hz @ 1 kHz |
| Rx Path Noise Figure | ≤ 12 dB |
| Rx Channel Gain & Flatness | 35 ± 1 dB / Flatness ± 0.5 dB (@ 125 ± 15 MHz) |
| Input / Output P1dB | Input: > -5 dBm / Output: 8 ~ 10 dBm |
| Channel Isolation | ≥ 50 dB |
| Mirror & Harmonic Suppression | ≥ 60 dB |
| Reference Clock Output | 100 MHz Sine Wave / Power: 13 ± 0.5 dBm |
| Reference Clock Phase Noise | ≤ -150 dBc/Hz @ 1 kHz / ≤ -160 dBc/Hz @ 10 kHz |
5. Physical, Electrical, and Control Interfaces
All power, digital control, and IF signals connect via rear chassis interfaces engineered for field integration:
| Rear Interface Type | Port / Connector Details | Primary Function |
| Control & Power | 1 × J30J-31ZK Connector | Synchronous RS-422 bus & DC 18V–36V power input |
| IF Signal Outputs | 5 × SMA Coaxial Ports | Routing front-end IF and monopulse signals to host receiver/ADC subsystem |
| Reference Clock | 1 × SMA Coaxial Port | 100 MHz Sine wave reference clock output |
| Mechanical & Environmental Parameter | Specification / Requirement |
| Chassis Dimensions (L × W × H) | ≤ 220 × 220 × 65 mm (Excluding connectors) |
| System Weight | ≤ 3.0 kg |
| Power Supply Input | DC 18V–36V (Nominal +24V DC) |
| Max Power Consumption | ≤ 75 W (At 20% transmission duty cycle) |
| Operating Temperature | -40°C to +70°C |
| Surface Finish | Conductive oxide coating (Cavity) / White primer (Radome) |
6. Synchronous RS-422 Digital Control Architecture
Digital beam control utilizes a synchronous serial interface over differential RS-422 signaling via the J30J-31ZK connector.
Note: The following frame structures and message type assignments (e.g., 0x13, 0x31, 0x32) represent illustrative integration examples. Exact protocol definitions must be verified against the applicable interface-control document (ICD).
- Command Frame Structure (Host → Array): Accepts 16-byte steering and mode control frames (e.g.,
0x13message type for beam steering,0x31for frequency/channel control) carrying frequency codes, Tx/Rx mode switches, azimuth/elevation angles, and attenuation settings. - Telemetry Frame Structure (Array → Host): Returns a 36-byte status telemetry frame (e.g.,
0x32message type) supplying array temperature readings, sub-array current draw, and power supply stability flags for real-time thermal and electrical health monitoring.
7. OEM/ODM Customization Scope
The standard panel operates from 9.2 GHz to 10.0 GHz with vertical polarization. For specialized platform deployments of high-EIRP active phased array modules or the 64-channel X-band 2D active phased array antenna, available OEM/ODM customization options include:
- Custom frequency sub-band tuning and LFM bandwidth adjustments
- Alternate polarization configurations (Horizontal polarization available upon request)
- Modified mechanical mounting footprints and custom connector arrangements
- Custom control-interface and protocol adaptation
Frequently Asked Questions
Q1: What is the primary advantage of the internal 125 MHz IF transceiver architecture?
Integrating a 125 MHz IF transceiver directly within the array chassis reduces the need for external X-band downconversion stages and simplifies RF cabling. The panel outputs analog IF signals directly to host ADCs, simplifying baseband hardware design and reducing RF interconnect losses.
Q2: How fast can the array hop frequencies and switch beam positions?
The array executes frequency hopping across 25 MHz step intervals in < 60 µs and completes electronic beam switching in ≤ 7 µs. Beam handover and frequency hopping are specified separately, supporting agile tracking and ECCM routines.
Q3: What power supply and thermal conditions are required for integration?
The array operates off a DC 18V–36V power input (nominal +24V DC) and consumes ≤ 75 W at a 20% transmission duty cycle. Weighing ≤ 3.0 kg with dimensions of ≤ 220 × 220 × 65 mm, the compact enclosure supports conduction-cooled integration across an operating temperature range of -40°C to +70°C, subject to system-level thermal design.