User’s and Service Guide
11667A
DC to 18 GHz Power Splitter
Part Number 11667-90003 Print Date: June 2001
Supersedes: November 1999 Printed in USA
Notice
The information contained i n this document is subject to change without noti ce.
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Agilent Technologies
Santa Rosa Systems Division
1400 Fountaingrove Parkway
Santa Rosa, CA 95403-1799, U.S.A.
© Copyright 1974, 1999, 2001 Agilent Technologies, Inc
2 User’s and Service Guide 11667- 90003
General Information
The 11667A power splitter is a two-resistor type power splitter for use in network
measurements where one arm of the power splitter is used for leveling or to supply a
reference signal for a ratio measurement.
Specifications
The specifications are listed in Table 1. These specifications are the performance standards or
limits, against which the power splitter may be tested. The typical operating characteristics
are provided in Table 2, “Typical Operating Characteristics,” on page 4. They are included as
additional information only; they are not specifications.
Table 1 11667A Specifications
Frequency (GHz)
DC to 4 4 to 8 8 to 18
Input SWR
Equivalent Output SWR (Leveling or
ratio measurement)
Output Tracking (between out p ut
arms)
1.≤ 1.38 for Option 002
1.15
≤
1.10
≤
0.15 dB 0.20 dB 0.25 dB
1.25
≤
1.20
≤
≤
1.33
≤
1.45
1
Frequency Range: DC to 18 GHz
Maximum Input Power: +27 dBm
Connectors:
Type-N Female on all ports
Option 001: Type-N Male on the Input and Type-N Female on the Output Ports
Option 002: Type-N Female on the Input and APC-7 on the Output Ports
Dimensions: 52mm wide x 46mm high x 21.3mm deep (2.06 in. x 1.82 in. x 0.84 in.)
Shipping Weight: 0.22 kg (8 oz.)
User’s and Service Guide 11667-90003 3
Table 2 Typical Operating Characteristics
DC to 4 4 to 8 8 to 18
Frequency (GHz)
Phase Tracking (between output
arms), typically:
Insertion Loss: 6 dB nominal (input to
either output)
0.5°
≤
0.2,
≤−
+0.6 dB
1.5°
≤
0.2,
≤−
+1.0 dB
3.0°
≤
0.2,
≤−
+1.8 dB
Figure 1 Leveling or Ratio Measurement Source Match Graph
CAUTION Applying a signal greater than +27 dBm (0.5 Watts) may result in damage to the
power splitter.
Options
The standard 11667A power splitter is supplied with a female type-N on all three ports. The
Option 001 provides a type-N male connector on the input and two type-N female connector s
on the output ports. The Option 002 is supplied with a type- N female connector on the input
and APC-7 connectors on the output ports.
Description
The 11667A is a two-resistor power splitter for use in measurement systems where one arm is
an active arm. The active arm may be a leveling loop, or a reference channel of the network
analyzer for making a ratio measurement.
Power splitters used for wide-frequency coverage are usually of the resistive type. The
generalized form of a pow er splitter is shown in Figure 2, on page 5.
4 User’s and Service Guide 11667- 90003
Figure 2 Typical Power Splitter Diagram
For simple power-dividing, a resistance value of 16 2/3 Ω in each arm will give an output
impedance of 50 Ω on any port, provided that all other ports are terminated in the
characteristic impedance of 50 Ω.
A network analyzer measurement system, as shown in Figure 3, uses the recommended
two-resistor type power splitter. Here R2 = R3 = 50 Ω, and R1 = 0 Ω. The two-resistor power
splitter, such as model 11667A, provides a better output SWR when used in leveling or in
ratio measurement applications.
Figure 3 Simplified Diagram of a Network Analyzer System
When a power splitter is used in a network analyzer system, the node at the fork of the power
splitter is kept at a fixed voltage by the AGC action of the network analyzer’s reference
channel. Since this action forces the node to be held at a constant voltage, a virtual ground is
present.
If a three-resistor power splitter, as shown in Figure 4, is used in leveling or ratio
measurement applications, each port will have an output impedance of 16 2/3 Ω to ground.
This would be a 3:1 mismatch which could cause significant measurement errors.
Figure 4 Three-Resistor Power Splitter
However, the 11667A power splitter uses two 50 Ω resistors, as shown in Figure 5, on page 6.
The network analyzer creates a virtual ground at the fork, enabling the resistance in each
output arm of the power splitter to be a matched 50 ohms .
User’s and Service Guide 11667-90003 5
Figure 5 11667A Power Splitter Schematic
Although optimized for leveling or ratio measurements when used as a coupler, the power
splitter still provides excellent frequency response tracking for direct power splitting
applications with typically <1.8:1 SWR.
6 User’s and Service Guide 11667- 90003
Installation
Initial Inspection
Inspect the shipping container for damage . If the shipp ing container or cushioning material is
damaged, it should be kept until the contents of the shipment have been checked
mechanically and electrically. If the contents are incomplete , or i f there i s mechanical da mage
or defects, or if the device does not meet specifications, notify the nearest Agilent office. If the
shipping container is damaged, or the cushioning material shows signs of stress, notify the
carrier as well as the Agilent office. Keep the shipping materials for the carrier’s inspection.
The office will arrange for repair or replacement without waiting for claim settlement.
Figure 6 Device Features
User’s and Service Guide 11667-90003 7
Storage and Shipment
Environment.
The splitter should be stored in a clean, dry environment. The following environmental
limitations apply to storage and shipment:
Temperature: −40 °C to +75 °C
Humidity: <95% relative
Altitude: <25,000 feet
Original Packaging.
If you need to ship the splitter for any reason, be sure to use the original (or comparable)
packaging materials. If the device is being returned to Hewlett-Packard for servicing, attach a
tag indicating the type of service required, return address, model number , and full serial
number. Also mark the container FRAGILE to assure careful handling. In any
correspondence, refer to the instr ument model number and full serial number.
8 User’s and Service Guide 11667- 90003
Operation
Environment
The operating environment should be within the following limits:
Temperature: 0 °C to +55 °C
Humidity: <95% relative
Altitude: <15,000 feet
Adjustments
The 11667A power splitter requires no electrical or mechanica l adjustme nts.
User’s and Service Guide 11667-90003 9
Service
Replacing the APC-7 Center Contact (Option 002 Only)
This contact is a small, four-pronged, sp ring-action contact which snaps into a recess in the
center conductor. It is normally held in place by the spring-action of the four prongs. With a
magnifying glass, examine the contact to determine if it needs replacement.
CAUTION Do not remove this contact for inspection. It may be damaged by removal.
The contact should be free of burrs or wear and the prongs should be equally spaced. Push the
contact in with your fingernail and note the spring action. If the contact needs replacing,
proceed as follows:
1. Place the power splitter so that the connector face is down.
2. Tap the pin connector lightly and the contact should protrude slightly. Insert the centering
pin of the contact extractor (Part Number 5060-0236) with the jaws open. If this tool is not
available, an ordinary draftsman’s mechanical pencil may be used. (The end of the jaws
may have to be filed to get a good grasp at the very end.)
3. Allow the jaws of the tool to close and pull straight away fr om the connector without
twisting. The contact should come o ut with t he tool. If not, r epe at the p rocess. Do not reuse
the contact.
4. Insert a new contact (Part Number 1250-0907) with the fingernail.
Troubleshooting
Troubleshooting the 11667A power splitter usually takes advantage of the fact that the circuit
elements are split into two channels. Malfun ctions will usually occur in only one channel at a
time. Therefore, malfunctions can be confirmed by reversing connections to the splitter.
Since the power splitter works to DC, an ohmmeter can be used to check the inner conductor
connections. The resistanc e from either output center conduc tor to the input center conductor
should be 50 Ω ±±2
Ω.
Ordering Information
To obtain rep lacement parts , contact the nearest Agilent T echnolo gies. T able 3 on page 11 lists
the replaceable parts. Do not try to replace any parts not listed.
10 User’ s and Serv ice Guide 11667-900 03
Table 3 Replaceable Parts
Part Number Qty Description
2200-0165 6 Screw: machine 4-40 x 0.312-inch Pozidriv
flat head
Standard 11667A and Type-N Female
on Option 002
1250-0549 3 Connector Type-N
1250-0915 3 Contact: center conductor Female
5040-0306 3 Insulator
5020-9108 3 Conductor: center
5020-9107 3 Conductor: outer
Model 11667A Option 001 (Male
Type-N Input)
1250-2184 1 Retaining Ring
5021-1746 1 Connector Flange
1250-0916 1 Connector Body Type-N
1250-0917 1 Male Pin Type-N
1250-0918 1 Connector Nut Type-N
5020-9778 1 Center Conductor Extension
Model 11667A Option 002 (APC-7
Connectors Only)
1250-0909 2 Connector Assembly: APC-7
5021-1746 2 Connector Flange
85130-20002 2 Contact holder: center conductor
85050-20001 2 Contact: center conductor
User’s and Service Guide 11667-90003 11
Repair
CAU TION Do not open the 11667A power split ter. Opening the 11667A power splitter voids
the warranty.
Replace only the parts shown in Table 3. To replace these parts, proceed as follows:
Standard Model 11667A and Type-N Connectors on Options 001 and 002
1. Loosen and remove the two Pozidriv screws on the faulty connector. Remove the flange.
2. With a rotating motion, pull the center conductor assembly loose.
3. Use a pin vise to unscrew the two pins.
4. Replace the defective part.
5. Apply a small amount of Locktite to the threads of the contact and screw the center
conductor assembly together.
6. Push the end of the conductor assembly into the connector hole while rotating the
assembly. Do not force it on. It should slide on.
7. Complete the remainder of the assembly in reverse order of disassembly.
Option 002 (APC-7 Connectors)
1. With a thin 1/2-inch open wrench, remove the outer connector assembly on the faulty
connector.
2. Loosen and remove the two Pozidriv screws. Remove the flange.
3. With a rotating motion, pull the center conductor assembly loose.
4. Use a pin vise to unscrew the two pins.
5. Replace the defective part.
6. Apply a small amount of Locktite to the threads of the contact and screw the center
conductor assembly together.
7. Push the end of the center conductor assembly into the connector hole while rotating the
assembly. Do not force it on: it should slide on.
8. Complete the remainder of the assembly in reverse order of disassembly.
12 User’ s and Serv ice Guide 11667-900 03
Contacting Agilent
By internet, phone, or fax, get assistance with all your test and measurement needs.
Online assistance: www.agilent.com/find/assist
United States
(tel) 1 800 452 4844
New Zealand
(tel) 0 800 738 378
(fax) (+64) 4 495 8950
Country Phone Number Fax Number
Singapore 1-800-375-8100 (65) 836-0252
Malaysia 1-800-828-848 1-800-801664
Philippines (632) 8426802
Thailand (088) 226-008 (outside Bangkok)
Hong Kong 800-930-871 (852) 2506 9233
Latin America
(tel) (305) 269 7500
(fax) (305) 269 7599
Japan
(tel) (+81) 426 56 7832
(fax) (+81) 426 56 7840
Asia Call Center Numbers
1-800-16510170 (PLDT
Subscriber Only)
(662) 661-3999 (within Bangkok)
Canada
(tel) 1 877 894 4414
(fax) (905) 282-6495
Australia
(tel) 1 800 629 485
(fax) (+61) 3 9210 5947
(632) 8426809
1-800-16510288 (PLDT
Subscriber Only)
(66) 1-661-3714
Europe
(tel) (+31) 20 547 2323
(fax) (+31) 20 547 2390
Taiwan 0800-047-866 (886) 2 25456723
People’s Republic
of China
India 1-600-11-2929 000-800-650-1101
800-810-0189 (preferred)
10800-650-0021
10800-650-0121
User’s and Service Guide 11667-90003 13
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