4-x-plank-demonstrator.pdf

X-Band 4 x QTRM Plank Product Capability
MA-100002
Description
The X-band Plank described below contains four Quad Transmit Receive Modules providing sixteen ports
which can be connected to individual antenna elements to form a 1-D phased array active antenna unit.
Three M2 threaded holes in the end of each QTRM facilitates the attachment of a quad antenna module.
Alternatively, equal length, low loss microwave cables can be used to connect to individual antenna
elements in which case the holes could be used to attach a plate fitted with four cables.
Provision for liquid cooling allows continuous transmission of long pulse widths at high duty cycles
through all sixteen elements simultaneously, thus creating a high power transmitter pulse at X-band.
A closed loop cooling system comprising of a fluid reservoir, pump and heat exchanger can be used to
pump the coolant through the Plank.
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QTRM
Common module ‘Building Block’
4-Channel integrated assembly comprising of DC, Logic CTRL/Interface & T/R Module
Designed for high volume manufacture
Minimal alignment, custom ATE for factory ‘calibration’
Description
The Plank is supplied from a single 28 volt DC supply and contains the necessary supply conditioning
to power the four QTRM’s. A power-up sequence ensures that the input current surge is managed both
within the individual QTRM’s and within the Plank so as to avoid overloading the primary 28 volt supply on
switch-on.
In addition, a half-duplex, asynchronous, RS485 bus allows communication to and from an external
Beam Steering Computer (BSC) that provides control and monitoring of the Plank and its QTRM’s. The
serial data takes the form of a number of messages assigned to either control the individual T-R elements
or to retrieve information about their settings or health status. RF2M have developed a Graphical User
Interface (GUI) to control and monitor the behaviour of the Plank and can be run from a laptop or desktop
computer.
Timing is provided by either an internal or external 100MHz clock and is selected via the micro-D
connector.
A transmitter power amplifier gating pulse must be provided to activate the PA power supplies just before
the RF pulse arrives at the common RF I/O port. This is to ensure that any amplitude and phase transients
caused by the PA’s turning on do not interfere with the integrity of the RF pulse. All subsequent timing
within the plank is derived from this TX PA gating pulse leading edge. The plank may be driven with a CW
signal for test purposes as internal modulation is provided.
A scheduler mode can be selected which rapidly stores a maximum of sixteen, pre-determined beam
steering coordinates. An external Beam Steer pulse must be provided by the BSC to step through the
schedule to allow very fast beam switching.
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 can be uploaded to the QTRM’s via the RS485 serial data link.
This product offering from RF2M Microwave provides the means to experiment with X-band phased array
radar and to further develop a 2-D radar by stacking Planks up to eight deep. This product significantly
reduces development time allowing customers to focus their valuable resources on radar signal
processing and beam control.
RF2M Microwave would welcome the opportunity to work with customers during their product
development by providing technical support to customise an active antenna array solution.
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: Transmit
Centre Frequency
9.5
GHz
See Note 1
Operating BW
1
GHz
See Note 1
Input Return Loss
10
dB
Common RF In/Out port
Output Return Loss
10
dB
Individual Antenna ports
Pulse Width
3
100
μS
80μS at 30% Duty max.
Duty Cycle
5
30
%
80μS at 30% Duty max.
RS485 Serial Data bus
Differential
Asynchronous UART, half-duplex
Data Control Rate
5.0
Mbps
TX PA Gating Pulse
Differential
Gate TX PA on 2.6 μS before RF pulse,
target 1 μS
Beam Steering Pulse
Differential
Triggers Beam Direction change
No. of Stored Beam Settings
16
Beam Steer Data Transfer Time
350
μS
30
Volts
Plank Input Voltage Range
26
+28
Scheduler Mode
Time taken to re-load the Scheduler
register
Plank Input Current
8.5
Amps
Average current @ 28v, 30% duty
DC Input Consumption
238
Watts
Average power @ 28v, 30% duty
Beam former Insertion Loss
13
dB
Selectable Int. or Ext. Clock
100
MHz
To be confirmed
±20ppm LVDS
Parameters: Transmit
TX Psat
8.5
TX Input Power Level
+20
Spurious
-60
dBc
TX Phase Variation across pulse
4.0
deg
Across 80μS Pulse at 30% Duty
TX Amplitude Variation across pulse
0.5
dB
Across 80μS Pulse at 30% Duty
Harmonics
-20
dBc
TX Insertion Phase Balance
±15
deg
Between any two channels. Target ±10
±2.0
dB
Between any two channels. Target ±1
TX Power Balance
Watts(pk) 8.5Watts output per antenna port at Fo
+23
dBm
For Psat Out.
Parameters: Receive
RX Output P1dB
-4
dBm
RX Gain
14
dB
RX Input IP3
-8
dBm
RX Noise Figure
4
Receiver Protection per Channel
15
dB
See Note (2) & (3)
See Note (4). Target <3.5dB
Watts PK Protection from reflected TX Power
RX Insetion Phase Balance
±15
deg
Between any two channels. Target ±10
RX Gain Balance
±2.0
dB
Between any two channels. Target ±1
Product Features
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RS485 Half-Duplex, 5.0 Mbps serial data bus for control and monitoring.
Plank operating current and power supply health monitored and reported on request along
with health status of each QTRM
Automatic shut-down of individual QTRM’s if their internal temperature reaches a critical limit
where damage could occur. Hysteresis applies.
Positive supplies inhibited (with the exception of the digital control circuits) if negative supply
is lost
Direction cosines used for beam steering
QTRM’s respond to individual address or broadcast messages.
Module position assignment
Sequenced QTRM power-up timing based on module position address
Ability to schedule up to 16 phase & amplitude settings for rapid beam switching
Ability to disable internal modulation and apply externally
Array CAL allows end-user to add additional TRU phase & amplitude calibration.
Read-back of CAL phase & amplitude values for each TRU.
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Selection of internal/external Clock source to allow synchronisation of multiple QTRM’s.
European Manufacture.
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Mechanical
Approximate Size: 203mm(L) x 270mm(W) x 20mm(D) excluding connectors. See Note (5)
Approximate Mass: 1.2 Kg
RF Connectors: Male SMP shroud
DC Connector : 37-way Micro-D plug
Hydraulic Connectors : Staubli CGO 03 type, non-spill
Cooling Fluid : Glycol mix
Inlet Temperature : +48°C max.
Fluid Flow Rate : 1Litre/min
Outlet Temperature : approximately +58°C for an inlet temperature of +48°C
Pressure Drop : < 0.2 bar with a fluid flow rate of 1L/min
Environmental
Operating Ambient: -30 to +70°C.
Assumes Plank Fluid Inlet Temperature is in the range +10 °C to +48 °C
Storage: -40 to +85°C
MTBF : TBD
NOTES
(1) Limited by circulator specification and physical dimensions of the QTRM
(2) Up to 3dB reduction in useable attenuation range due to Calibration.
(3) Figure given for Ref Attenuator state, Ref Phase State and includes Beam former losses.
(4) N.F. given for Ref Attenuator state, Ref Phase State and includes Beam former losses.
(5) Dimension “D” is for Demo Unit only. Potential to reduce to 14.1mm for a practical AESA
configuration. See outline diagram in section 8 below.
Functional Block Diagram
Tx PA Gate
+v
e
-ve
Beam Steer
+v
e
-ve
RS485 ASYNC
Bus
Bus to
QTRM's
Bus to
QTRM's
+v
e
-ve
Antenna Port 1
QTRM A
Bus to
QTRM's
Antenna Port 2
Antenna Port 3
Antenna Port 4
Antenna Port 5
QTRM B
RF
In/Out
+28v
Input
Converters
& LDO's
+28v
+6.0v
+3.3v
+5.0v
-6.0v
Antenna Port 7
Antenna Port 8
Antenna Port 9
Converter Sync
Switch
Logic
DRVR
Antenna Port 6
QTRM C
Antenna Port 10
Antenna Port 11
Antenna Port 12
Monostable
Antenna Port 13
100MHz
Clock
Antenna Port 14
Div 100
QTRM D
Antenna Port 15
Antenna Port 16
Int Clk Enable
Ext. 100MHz Clock
+
+
Bus to
QTRM's
DC Pin-Out Connection’s (37-way Mirco-D)
Pin No.
Description
Pin No.
Description
Pin No.
Description
Pin No.
Description
1
+28V
Ext_CLK +ve
21
+28V
31
Spare
2
+28V
11(1)
12
Signal GND
22
PSU GND
32
Spare
3
PSU GND
13
Spare
23
PSU GND
33
-6V Flag
4
PSU GND
14
+28V Flag
24
ADDR_1
34
Pmon Flag
5
ADDR_0
15
+6V1 Flag
25
Tx PA Gate +ve
35
ICC_Mon
6
ADDR_2
16
+6V2 Flag
26
Signal GND
36
Spare
7
Tx PA Gate -ve
17
+5V Flag
27
RS485 -ve
37
Spare
8
RS485 +ve
18
Spare
28
Beam Steer +ve
9
Signal Gnd
19
Int_CLK Enable
29
Signal GND
Beam Steer -ve
20
+28V
30
Ext_CLK -ve
10
Notes
(1) External Clock (if used) 100MHz LVDS ±20ppm max.
Preliminary Outline 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
info.rf2m@apitech.com
micro.apitech.com
+1 855.294.3800
www.apitech.com