X-Band 1024-Channel 2D Active Phased Array Antenna: AiP Architecture and Radar System Integration

Modern tactical radar networks, fire-control tracking systems, and airborne surveillance platforms require high angular resolution and rapid electronic beam steering without compromising SWaP-C (Size, Weight, Power, and Cost). Achieving high Effective Isotropically Radiated Power (EIRP) and low receiver noise figure performance in X-band tracking radar applications traditionally required bulky waveguide distribution networks, external beamformers, and dedicated power supply units.

The X-Band 1024-Channel 2D Active Phased Array Antenna addresses these integration constraints through an advanced Antenna-in-Package (AiP) design topology. Featuring a 32×32 element active electronically scanned array (AESA) matrix integrated into a chassis with a thickness of just 65 mm and a total system weight of ≤ 14 kg, this active array generates an EIRP of ≥ 92 dBm across the entire 9.2 GHz to 9.8 GHz operational bandwidth. The assembly integrates the monopulse sum-and-difference network, power supply wave controller, and frequency synthesizer directly within the array enclosure.

In short, this monolithic design consolidates the entire RF front-end and beamforming hardware into a single plug-and-play panel, significantly streamlining radar system assembly.

1. System Architecture: 32×32 AiP Matrix and Integrated RF Front-End

Managing 1,024 active T/R channels within a 600 × 630 × 65 mm form factor requires high component density and optimized thermal-electrical routing.

Antenna-in-Package (AiP) Topology

Legacy active electronically scanned arrays rely on discrete T/R modules cabled to separate radiating patches. By contrast, this array utilizes an integrated AiP architecture:

• High EIRP Density: Achieving ≥ 92 dBm system EIRP across all operational bands and temperatures ensured by 1,024 coordinated active radiating elements.
• Low-Noise Receiver Architecture: Integrates active channel gain of ≥ 15 dB (adjustable) with a system noise figure of < 3.5 dB, yielding a figure of merit (G/T) sensitivity of ≥ 6.5 dB/K.
• Compact Depth: Consolidates the monopulse sum-and-difference matrix, beamforming wave controller, and internal local oscillator (LO) frequency synthesizer into a single 65 mm-deep enclosure.

System Signal Flow Architecture:

1. System Exciter Input: Delivers Tx/Rx excitation (25 ± 2 dBm) into the array’s SMA-K interface.
2. Unified AiP Chassis (65 mm depth): RF signals are processed through the integrated 32×32 active matrix with internal beam-control and frequency-management functions before transmission through the radome.
3. Monopulse Sum-and-Difference Network: Processes incoming signals to generate Azimuth Difference (FWC) and Elevation Difference (FYC) outputs via dedicated SMA-K interfaces.
4. Power Supply & Wave Controller: Receives beam steering commands and power via the J30J-15ZK synchronous RS422 control interface.

By eliminating external coaxial interconnects between T/R modules and the beamformer, internal transmission losses are kept to an absolute minimum.

2. RF Performance & Monopulse Tracking Specifications

The active array provides precise electronic beam steering and deep null monopulse tracking capabilities suitable for target acquisition and precision tracking radar networks.

Electronic Scan Range and Pointing Precision

The array achieves wide-angle electronic scanning across both Azimuth and Elevation axes:

• Electronic Scan Range: ±45° Azimuth / ±45° Elevation.
• Scan Gain Roll-Off: ≤ 3 dB at extreme scan angles (±45°).
• High-Precision Angular Pointing: Achieves an angular pointing error of ≤ 0.15° within a ±20° primary tracking cone, and ≤ 0.3° across the full ±45° scan volume.
• Rapid Beam Switching: Executes full-array phase recalculation and beam repositioning in ≤ 70 µs, enabling multi-target tracking and interleaved search-and-track radar modes.

Monopulse Sum-and-Difference Beam Pattern

To support high-accuracy angle tracking, the internal feed network generates sum (Σ) and difference (Δ) beams:

• Transmit Beamwidth: 2.8° ± 0.3° at center frequency.
• Receive Beamwidth: 3.6° ± 0.4° at center frequency.
• Sidelobe Suppression: Receive 1st sidelobe level is maintained at ≤ -22 dB in the normal direction.
• Monopulse Null Depth: Difference beam null depth reaches -22 dB (typical) in both Azimuth and Elevation planes, providing accurate angular error estimation for precision tracking.

These tight beam characteristics ensure stable angle measurement even under heavy electronic countermeasure or clutter environments.

3. Comprehensive RF Specifications Table

The key electrical, RF, and beam-steering metrics for the 1024-channel 2D active phased array antennas are detailed below:

Technical Parameter	Specification / Requirement
Operating Frequency Band	9.2 GHz ~ 9.8 GHz (Frequency tuning step: 30 MHz)
Array Topology	32 (Azimuth) × 32 (Elevation) = 1,024 Elements
Polarization Method	Vertical (Horizontal customization available)
System EIRP (Normal)	≥ 92 dBm (Across all bands/temps)
G/T Sensitivity (Normal)	≥ 6.5 dB/K (Across all bands/temps)
Electronic Scan Range	Azimuth ±45° / Elevation ±45°
Scan Gain Roll-Off	≤ 3 dB (within ±45° scan range)
Pointing Accuracy	≤ 0.3° (±45° scan) / ≤ 0.15° (±20° scan)
Tx Normal Beam Width	2.8° ± 0.3° (@ center frequency)
Rx Normal Beam Width	3.6° ± 0.4° (@ center frequency)
Difference Beam Null Depth	-22 dB (Typical, Azimuth & Elevation)
Receive 1st Sidelobe Level	≤ -22 dB (Normal direction)
Rx Active Channel Gain	≥ 15 dB (Design guarantee; adjustable)
Receiver Noise Figure	< 3.5 dB (Across all bands/temps)
Transmitter Excitation Power	25 ± 2 dBm
Beam Switching Speed	≤ 70 µs

4. Mechanical, Thermal, and Power Management Specifications

Integrating 1,024 active T/R channels requires robust thermal management and a wide-input DC power supply architecture.

SWaP-C Parameters & Environmental Limits

• Physical Dimensions: ≤ 600 × 630 × 65 mm (excluding connectors).
• System Weight: ≤ 14 kg, facilitating installation on mobile vehicles, naval masts, and airborne pods.
• Power Supply Input: Wide DC input range of 18V ~ 36V (nominal +24V DC).
• Maximum Power Consumption: ≤ 1000 W at a 20% transmission duty cycle.
• Operating Temperature Range: -40°C to +70°C.
• Surface Coating: Conductive oxide coating on inner cavities; white protective primer on the radome exterior.

Parameter	Specification
Dimensions (L × W × H)	≤ 600 × 630 × 65 mm
System Weight	≤ 14 kg
Power Supply Input	DC 18V ~ 36V
Max Power Consumption	≤ 1000 W (At 20% transmission duty cycle)
Operating Temperature	-40°C to +70°C
Surface Finish	Conductive oxide coating (Cavity) / White primer (Radome)

Overall, the panel’s low 14 kg weight and 65 mm depth allow integrators to mount the array directly onto lightweight gimbals or flat vehicle surfaces.

5. Hardware Interfaces & Pinout Configurations

The array provides military-grade J30J Micro-D connectors and SMA coaxial interfaces for high-reliability radar back-end integration:

Connector Matrix

1. RF Interface (SMA-K):
   • H Pin: Tx/Rx Excitation Input (25 ± 2 dBm).
   • FWC Pin: Azimuth Difference Beam Output.
   • FYC Pin: Pitch/Elevation Difference Beam Output.
2. Control & Communications (J30J-15ZK):
   • High-speed Synchronous RS422 differential lines (RXD±, TXD±, CLK±).
   • Real-time transmit/receive switching control (TRT/TRR±).
   • Lock detect (LD±) and beamforming status (BF±).
3. Main Power Supply (J30J04P040 – 4 Sets):
   • Pins A/B: +24V DC line.
   • Pins C/D: System Power Ground (GND).
4. Fan Control (PHB 2.0):
   • Supports up to 4 external fan groups with PWM speed regulation directly managed by internal thermal telemetry.

6. RS422 Communication Protocol & Real-Time Telemetry

For seamless integration into proprietary radar processing back-ends, the array features a transparent synchronous RS422 control interface running at clock speeds ≥ 10 MHz.

Packet Structure Overview

• Data Link Format: Synchronous RS422 (Clock ≥ 10 MHz, 1 Start Bit + Payload + 1 Stop Bit).
• Beam Control Tx Packet (Signal → Array): 16-byte payload (0x10) containing Message Type (0x13), Frequency Encoding, Tx/Rx Switching Control, Azimuth/Pitch Beam Angle Encoding (0.05° quantization), and 1024-channel switch control matrix settings.
• Status Monitor Rx Packet (Array → Signal): 36-byte status monitoring structure (0x24) returning Message Type (0x32), 16-byte array localized temperature data, 16-byte sub-array current telemetry, and PWM fan speed feedback.

This continuous status stream gives system controllers real-time insight into the operational health and thermal margins of all sub-arrays.

Custom OEM/ODM Integration for X-Band Radar Systems

Do your tracking, counter-UAS, or airborne AESA radar platforms require custom frequency sub-bands within 8.0 GHz ~ 12.0 GHz, horizontal or dual-circular polarization, or custom mechanical mounting footprints?

Contact our engineering team to request detailed protocol documentation, ICD drawings, and custom prototype development for X-band monopulse tracking arrays and high-EIRP active phased array modules.

Frequently Asked Questions

Q1: What is the primary advantage of integrating the monopulse network inside the 65mm chassis?

Integrating the monopulse sum-and-difference network directly into the AiP chassis eliminates external RF cabling losses, reduces system noise figures (< 3.5 dB), and ensures consistent difference beam null depths (≤ -22 dB) across temperature extremes.

Q2: How fast can the AESA antenna module switch beam positions across the ±45° scan envelope?

The array executes complete beam repositioning in ≤ 70 µs, driven by the high-speed synchronous RS422 control interface running at clock frequencies ≥ 10 MHz.

Q3: What excitation power is required from the system transmitter?

The array requires a nominal input drive level of 25 ± 2 dBm at the SMA-K excitation port. The internal active T/R modules amplify this input to generate the final system EIRP of ≥ 92 dBm.