Agilent N1810/1/2
Coaxial Switches
High Quality Electromechanical Switches for
Microwave and RF Manufacturing Test Systems
Product Overview
• High isolation - > 120 dB @ 4 GHz
• High repeatability - < 0.03 dB typical
• Low SWR - < 1.10 @ 4 GHz
• Low-insertion loss - < 0.27 dB @ 4 GHz
• Long life - > 5 million cycles
The solution for
high-volume wireless
communications test
• dc to 2 GHz
• dc to 4 GHz
• dc to 20 GHz
• dc to 26.5 GHz
In today’s fast moving technical
industries, test engineers need
components they can count on.
Agilent now offers a new line of
latching coaxial switches that
combine legendary reliability with
the widest range of performance
options available today.
Increase flexibility
For test systems that require
extra functionality or increased
performance, the N181x family of
switches has a solution that fits
your need. The options include:
• Reduced SWR
• Increased isolation
• Standard or TTL drive
• 5, 15, 24 volt drive
• Position indicators
• Current interrupts
Increase productivity
When you buy your switches from
Agilent, you notice a difference.
Your test platforms run smoother,
longer and faster, while yielding more
viable and valuable measurements.
Reduce downtime
Agilent Technologies is the world
leader in innovating and developing
microwave accessories for
communications and aerospace
applications. Our innovative design
and strict adherence to quality
process control ensure that each
switch is guaranteed to perform
within warranted specifications
for its entire lifetime. With fewer
breakdowns and less need to
recalibrate, your test system moves
quicker with less downtime, creating
more throughput and revenue.
Raise your standards
All Agilent switches offer excellent
repeatability and long life – up to
five times the lifecycles of the
competition. Add to this aggressive
specs for isolation, SWR, and
insertion loss, and you have a
switch that impresses even the
most demanding engineer with its
precision and durability.
Description
N1810UL
Unterminated latching
The Agilent N1810UL is a single-pole
double-throw switch available in
the frequency range from dc to
26.5 GHz. In precision measurements
and monitoring applications where
insertion loss repeatability is
crucial, these switches operate
in excess of 5 million cycles with
better than .03 dB of insertion loss
repeatability at 25°C.
N1810TL
Terminated latching
The Agilent N1810TL is a single-pole
double-throw switch available
in the frequency range from dc
to 26.5 GHz. The unused port is
terminated 50 ohms, making it ideal
for applications where port matching
is required.
N1811TL
Terminated latching
The N1811TL is a terminated bypass
switch available in the frequency
range from dc to 26.5 GHz. The
switch’s internal load can terminate
the device under test when in the
bypass mode (up to 1 watt). Because
of its compact design, it is ideal for
drop-in, drop-out applications.
N1812UL
Unterminated latching
The N1812UL is a versatile,
unterminated 5-port switch available
in the frequency range from dc
to 26.5 GHz. In transfer switch
applications, the fifth port can be
terminated externally with a highpower termination. It can also be
utilized for signal path reversal or
as a calibration port.
Technology
Agilent Technologies switches are
designed with a rectangular coaxial
structure similar to edge-line.
This transmission line structure
provides for movement of the
edge-line center conductor between
two fixed, continuous ground
planes. The main advantage of
this innovation is that the moving
contacts can be easily activated,
yet maintain high-isolation and
low-insertion loss.
The RF contact configuration is
designed for controlled wiping action.
Since the outer conductor is not
part of the switching function,
repeatability and life are improved.
The switching action occurs typically
within 15 milliseconds, after which
permanent magnets latch the
contacts to retain the new switch
position.
Operation
All switches are “break before make”:
the switched ports are not connected
to each other. This prevents
damage to sensitive circuits and
enhances test simplicity.
Driving
There are two positions for the
N181x family of switches. Standard
switching is accomplished by
applying the supply voltage to
pin 5 (+V) and grounding either
pin 4 (A) or pin 3 (B) to actuate the
mechanism to the desired state.
See page 5, pin-out diagram.
Warning minimum switch spacing
is 6.0 mm (0.25 inch).
When option 403 is added, the
drive current is automatically
disconnected after the switch is
fully latched (15ms). Without
option 403, the switches MUST
be actuated using a pulse drive —
the switches are not designed to
withstand continuous current. In
this case, the pulse duration must
be at least 15ms to ensure that
the switch will fully latch.
Option 401 drives the switch with
TTL/5V CMOS compatible logic,
which controls the DC power supply
to drive the switch.
Option 402 provides electronic
indication of switch state. The
circuitry consists of two independent
commons, which can be connected
to outputs corresponding to either
position A or B. Because the
commons are electrically isolated
from each other as well as the drive
circuit, this option allows two
position signals to be obtained.
2
Specifications
3
General
Input power (into load) 1 W, 7 V dc, 50 W pk, 10 µs max pulse duration, not to
exceed 1 W avg
Input power (into thru) 2 W, 7 V dc, 50 W pk, 10 µs max pulse duration, not to
exceed 2 W avg
Coil voltage 5, 15, 24 VDC
Standard performance specifications - N181x series
Isolation (dB) = , where F is specified in GHz
dc 4 GHz 12.4 GHz 20 GHz 26.5 GHz
90 85 76 67 60
Insertion loss (dB) = , where F is specified in GHz
dc 4 GHz 12.4 GHz 20 GHz 26.5 GHz
0.35 0.42 0.56 0.69 0.80
SWR dc-4 GHz 4-12.4 GHz 12.4-20 GHz 20-26.5 GHz
1.15 1.25 1.30 1.60
Optional high-performance specifications - N181x series
Isolation (dB) = , where F is specified in GHz
dc 4 GHz 12.4 GHz 20 GHz 26.5 GHz
Option 3011125 120 109 99 90
Insertion loss (dB) = , where F is specified in GHz
dc 4 GHz 12.4 GHz 20 GHz 26.5 GHz
Option 302 0.15 0.27 0.41 0.53 0.65
SWR dc-4 GHz 4-12.4 GHz 12.4-20 GHz 20-26.5 GHz
Option 302 1.10 1.20 1.23 1.45
Specifications describe the instrument’s warranted performance. Supplemental and
typical characteristics are intended to provide information useful in applying the
instrument by giving typical, but not warranted performance parameters.
.45
0.35+
(–)
F
26.5
35
125-(–)F
26.5
.45
0.20+
(–)
F
26.5
30
90-
(–)
F
26.5
1. Option 301:
Environmental: storage and cycling temperature: -55C to +65 C
Environmental: operating temperature: -25C to +65C
4
N1810UL
8.35
.329
4.35
.171
3.15
.124
10.65
.419
15.65
.616
13.15
.518
18.15
.714
20.65
.813
28.15
1.108
8.35
.329
4.35
.171
4.39
.173
11.89
.468
8.35
.329
16.89
.665
21.89
.862
19.39
.763
29.39
1.157
4.32
.170
2.36
.093
1.79
.071
11.39
.448
30.20
1.189
11.00
.433
12.70
.500
6.35
.250
5.89
.232
33.78
1.330
11.00
.433
8.16
.321
48.67
1.916
44.74
1.761
53.41
2.103
16.89
.665
6.35
.250
16.89
.665
6.35
.250
Option 202
Option 401
Option 201
Option 401
Option 201
Option 202
Option 201
Typical
Typical
Option 202
3.05
.120
2.40
.094
2X2XØ
Ø
5
N1810UL
RF Circuits
Position "A" Position "B"
N1810UL
RF CKT STATE "A" RF CKT STATE "B"
A A B B
A A B B
1 C
2
1 C
2
INDICATOR STATE "A" INDICATOR STATE "B"
12.0V
3.0V
1.0V
0V
TTL Control
Voltage States
REFERENCED
TO "GND" PIN
DRIVE
INDICATORS
DRIVE
INDICATORS
+V A B GND
A A B B
+V A B GND
A A B B
Pin out diagram
5 4 3 2 1
9 8 7 6
Switch drive specifications N1810UL
Option Parameter Conditions min nominal max Units
105 Supply voltage 4.5 5 7.0 V
supply current Supply voltage = 5 V 300 mA
115
1
Supply voltage 12.0 15 20.0 V
Supply current Supply voltage = 15 V 125 mA
124
2
Supply voltage 20.0 24 32.0 V
Supply current Supply voltage = 24 V 75 mA
Driving the switch*
TTL drive
STD drive Connect GND to RF State INDICATOR State
ground
A B A B
GND OPEN Hi Lo “A” “A”
OPEN GND Lo Hi “B” “B”
GND GND Hi Hi Switching Disabled ** NA
OPEN OPEN Lo Lo Switching Disabled ** NA
TTL Drive specifications
Option Parameter Conditions min nominal max Units
401 High level input 3.0 12.0 V
Low level input 0.0 1.0 V
Max input current input voltage = 12.0 V 1.0 mA
input voltage = 3.85 V 0.25 0.5 mA
GND: +V - Vsupply (see switch drive specification table, this page)
OPEN* +V to +v - 1.5 volts
Hi 3.0 V to 12.0 V
Lo 0.0 V to 1.0 V Warning Drive level below -.25 V will damage TTL drive circuit!
* WARNING! Use adapter cable 11764-60011 with 87130A switch driver
** WARNING! Driving both select lines will disable switch (see troubleshoot guide)
WARNING! Minimum switch spacing 6.0 mm (0.25 inch)
1. Option 115: Characteristic Life: 5 million cycles minimum, except 1 million cycles minimum
when driven at voltages 18-20 Vdc.
2. Option 124: Characteristic Life: 5 million cycles minimum, except 1 million cycles minium
when driven at voltages 28-32 Vdc.
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