c-band-qtrm.pdf

C-Band QTRM Product Capability
QTRM - Quad Transmit Receive Module (4-Channel T/R Module)
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Gallium Nitride Power Amplifier Technology
1GHz Bandwidth
Low Noise Figure (<4.5dB)
6-Bit Phase Control
6-Bit Attenuator Control
Single +28V Supply
BITE and PSU Supervisory
Built in Tx and Rx Power BITE Detectors
Factory Calibrated
Accessible memory for External Calibration data
Cooling interface
Designed to fit Typical Antenna Aperture Spacing
Line Replaceable Unit
European Manufacture.
Description
The C-Band Module contains four Transmit/Receive (T/R) channels providing four RF ports which can be
connected to individual antenna elements to form part of a phased array active antenna unit.
The module is fitted with blind mate RF connectors and its height and antenna port spacing dimensions
are specifically designed to allow direct connection to the back of antenna aperture face. Alternatively, RF
cable assemblies may be used to connect to the individual antenna elements.
The power amplifier section of each channel incorporates Gallium Nitride technology, this along with
provision for liquid cooling allows high power levels, long pulse widths and high duty cycles to be realised.
The Module is supplied from a single 28 volt DC supply and contains the necessary supply conditioning to
power the four channels. Built in power supply sequencing and built in test equipment (BITE) functions are
included to allow individual channel monitoring and shut-down in the presence of a fault condition.
Module communication for control and monitoring is provided by a half-duplex, asynchronous serial
EIA485 bus.
The serial data takes the form of a number of messages assigned to either control the individual T/R
channels or to retrieve information about the module’s settings or health status. RF2M have developed
a Graphical User Interface (GUI) to control and monitor the module which can be run from a laptop or
desktop computer.
Each module has a unique address which may be interrogated by an external controller; this allows the
external controller to address and individual module within an array.
The QTRM’s are factory calibrated to minimise amplitude and phase variations over temperature and
frequency, making them line-replaceable units. Additional calibration constants that are User system
related (such as the interface between the radiating element to T/R channel and any associated antenna
taper requirements) can be uploaded to the module via the EIA485 serial data link.
The QTRM supports ‘scaleable’ AESA Radar thus providing flexibility for different platforms applications.
Mechanical
Approximate Size: 150 mm(L) x 128 mm(W) x 28 mm(H) excluding connectors
Approximate Mass: 1.2 Kg
RF Connectors: Male SMP
DC Connectors : 37-way Micro-D (Power Supply & Control) and 15-way Micro-D (Factory Use Only) plugs
Hydraulic Connectors : Staubli non-spill CGO 03 type or Similar
Cooling Fluid : Glycol Mix
Inlet Temperature: +48°C max.
Fluid Flow Rate : 1Litre/min Typ
Pressure Drop : < 0.2 bar with a fluid flow rate of 1L/min
Environmental
Operating Ambient: -40 to +70°C Dependent upon Transmit Pulse Width, Duty Cycle and Inlet Cooling Fluid Temperature.
Storage: -40 to +85°C
NOTES
(1) Up to 3dB reduction in useable attenuation range due to factory Calibration
(2) Gallium Nitride Power Amplifier technology enables long pulse durations
(3) Figure given for Ref Attenuator state, Ref Phase State
Electrical Performance
Over TOP Unless Otherwise stated. Limits & Conditions are indicated values. Indicated
values given per channel unless otherwise stated.
Parameter
Min.
Typ.
Max.
Units
Conditions
Parameters: Common
Centre Frequency
5
GHz
Operating BW
1
GHz
Input Return Loss
12
dB
Common RF In/Out port
Output Return Loss
12
dB
Individual Antenna ports
Differential
RS485 Serial Data Bus
Data Control Rate
5.0
TX PA Gating Pulse
Differential
Beam Steering Pulse
Differential
Asynchronous UART, half-duplex
Mbps
Asynchronous UART RS485 Bus.
Triggers Beam Direction change
No. of Stored Beam Settings
16
Beam Steers Data Transfer Time
350
Scheduler Mode
μS
Time taken to re-load Scheduler register
Supply Voltage
+28
Volts
Supply Current
7.5
Amps
Average current @ 28v. 50% duty
DC Input Consumption
210
Watts
Average power @ 28v. 50% duty
31.5
dB
6-Bits, LSB = 0.5dB, See Note 1
dB
Reference Phase State
deg
6-Bits, LSB = 5.62°
deg
Reference Attenuation State
Amplitude Control
Attenuation Range
RMS Attenuation Error
1.5
Phase Control
Phase Shift Range
355
RMS Phase Error
Parameter
4.5
Min.
Typ.
Max.
Units
Conditions
Parameters: Transmit
TX Psat
8.5
TX Input Power Level
+18
dBm
Spurious
-60
dBc
Pulse Droop
0.2
dB
100 μS, 10% Duty Cycle
Pulse Droop (Long Pulse)
0.4
dB
40 mS, 80% Duty Cycle, See Note 2
Harmonics
-30
dBc
TX Insertion Phase Balance
±15
deg
±1.25
dB
TX Power Balance
Watts(pk) Per Channel
For Saturated Power
Parameters: Receive
RX Output P1dB
+6
dBm
RX Gain
15.5
dB
RX Noise Figure
4.5
dB
Receiver Protection per Channel
100
dB
RX Insetion Phase Balance
±15
dB
±1.25
dB
RX Gain Balance
See Note 3
300 μS Pulse
Functional Block Diagram
Single TRM Element Block diagram
QTRM Block diagram
Whilst every effort is made to ensure the accuracy of the information contained in this brochure, no responsibility can be accepted for any errors and/or omissions.
Descriptions and specifications of products are subject to change without notice.
+44 (0) 1908.574.200
[email protected]
micro.apitech.com
+1 855.294.3800
www.apitech.com
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