In radar tracking and communications applications requiring agile beam repositioning across two dimensions, active two-dimensional beam steering reduces reliance on mechanical beam repositioning by using planar phase control. The Ku-band 256-channel two-dimensional phased array antenna incorporates an active 2D scanning architecture across 15 GHz to 17 GHz, combining integrated T/R channels, an antenna-in-package (AIP) module, and an internal power divider network to provide dual-axis beam positioning and a normal system EIRP of ≥79 dBm within a compact ≤3 kg form factor.
16 × 16 Aperture Topology: Active 2D Scanning Architecture
Unlike 1D phased arrays that combine electronic elevation scanning with a fixed azimuthal baseline, this front-end provides active electronic scanning across both azimuth and elevation axes:
Technical Specs & Engineering Support
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- Aperture Grid Configuration: The planar radiating aperture integrates 256 antenna elements arranged in a symmetric grid of Nx = 16 in azimuth and Ny = 16 in pitch (elevation), yielding 256 total radiating units.
- Integrated Hardware Modules: The assembly integrates the antenna structure, AIP module, internal power divider module, and sum/difference network within a single enclosure.
- RF Distribution and Channel Compensation: During transmission, the array divides, phase-compensates, and amplifies the input drive signal across the 256 active channels to support electronic beam steering in both azimuth and elevation.
- Polarization Baseline: The radiating aperture operates with vertical polarization as its standard configuration, with horizontal polarization available as an option.
Dual-Axis Electronic Beam Steering Across Azimuth and Pitch
The 2D active topology supports electronic beam steering across both angular axes:
- Azimuth Electronic Scanning (±45°): The array supports an electrical sweep range of ±45° across the azimuthal plane.
- Elevation Electronic Scanning (±40°): Along the pitch axis, active electronic steering covers a sector of ±40°.
- Beam-Pointing Accuracy: The specified typical beam-pointing error is ≤0.2° within the ±45° azimuth scan range.
Transmit Signal Path: From 20 dBm Excitation to ≥79 dBm System EIRP
The transmit architecture scales an external exciter input into high directional radiated power across the 15 GHz to 17 GHz band:
- RF Input Excitation: The front-end accepts an input RF drive level of 20 dBm ± 1 dBm.
- Internal Distribution and Amplification: The internal power divider network routes this drive signal to the active T/R module stages, where channel-level amplification and phase/amplitude adjustment take place.
- Channel and Array Output Power: Each active channel delivers a peak output power of ≥27 dBm, while the specified full-array peak output power is ≥51 dBm across the operating band.
- Normal System EIRP: The array provides a normal system EIRP of ≥79 dBm at room temperature.
- Pulsed Duty Handling: The front-end supports transmitting duty cycles of up to 25%, with DC power consumption rated at ≤200 W at a 20% transmitting duty cycle.
Platform Integration and Electrical Constraints
The active 256-channel front-end is configured for platform integration with defined physical, thermal, and electrical interfaces:
- Dimensions and Enclosure Mass: The unit measures 220 mm × 310 mm × 54 mm (±0.5 mm) with a total mass of ≤3 kg, providing a compact mechanical form factor.
- DC Power Input & Consumption: The subsystem operates over a DC input voltage range of 18 V to 36 V via a dedicated J30J_04P04P000C00000 power connector, drawing ≤200 W at a 20% transmitting duty cycle.
- RF and Control Interfaces: The SMA-J connector provides the Ku-band RF drive and output interface, while a J30J_15ZK connector provides the control interface.
- Environmental Ratings: The assembly is specified for an operating temperature range of -40 °C to +70 °C and a non-operating storage range of -50 °C to +70 °C.
- Cavity Surface Treatment: The metal cavity features a colored conductive oxide finish, while the external antenna face uses a white primer.
Frequently Asked Questions (2D Array Architecture & Transmit Path)
Q: How does the 256-channel 2D scanning architecture differ from a 1D phased array?
A: In a 1D phased array, electronic phase control is applied along a single dimension (typically elevation), leaving the orthogonal axis fixed and non-scanning. This 256-channel array uses an active 16 × 16 aperture with 256 radiating units, enabling electronic beam steering across both azimuth (±45°) and pitch (±40°).
Q: What is the relationship between the 20 dBm ± 1 dBm excitation and the full-array peak power?
A: The 20 dBm ± 1 dBm input excitation is the specified RF drive condition at the array input. Internally, the RF signal is distributed and amplified across the active channels; the specified full-array peak output power is ≥51 dBm, with ≥27 dBm per channel.
Q: What thermal considerations apply when operating at extended duty cycles?
A: The system specifies a power consumption of ≤200 W at a 20% transmit duty cycle and supports duty cycles of up to 25%. System designers should provide appropriate thermal management to keep the unit within its specified operating temperature range of -40 °C to +70 °C.