Octave Bandwidth Pyramidal Horn Antenna - ETS
Contents
1. Secure the mount onto the 4 TR by tightening the1 4 20 UNC mount knob 19 Mount to 7 TR and Mast Following is an option for mounting the Model 3161 Series onto an ETS Lindgren 7 TR Tripod or mast Contact the ETS Lindgren Sales Department for information on ordering optional mounting hardware Mast refers to 2070 Series 2075 and 2175 Antenna Towers 7 TR refers to 109042 106328 and 108197 booms 109042 boom Straight boom for general antenna mounting on a 7 TR 106328 boom Offset boom for general antenna mounting on a 7 TR with pneumatic or manual polarization e 108197 boom Center rotate boom for rear mount stinger type antennas only 7 TR Mast To antenna mounting hole 104169 Boom Antenna Through boom on 7 TR Mast 20 Mount to 2x2 Boom Following are options for mounting the Model 3161 Series onto a 2x2 boom Contact the ETS Lindgren Sales Department for information on ordering optional mounting hardware 2x2 boom refers to a typical 2 inch by 2 inch boom 2x2 Boom To OR To antenna antenna mounting mounting hole 101913 SES 101937 Fixed Tu n Swivel Antenna Antenna Mount gn k Mount Insert boom through Insert boom through 21 This page intentionally left blank 22 5 0 Typical Data Following is typical electromagnetic performance data for the Model 3161 Series Octave Bandwidth Pyramidal Horn Antenna using Model 3161 01 data as representative of the series Typi2. to dB UV for voltage the overall constant becomes 30 120 10log 50 107 28 EQUATION 2 dB mW m2 dB uV m 115 8 The constant in this equation is obtained by considering the Poynting vector which relates the power density in Wim to the electric field strength in V m by El pae 1 Where n is the free space characteristic impedance equal to 1207 O Transforming the previous questions to decibels and using the appropriate conversion factors to convert dB W m to dB mW m for power density and dB V m to dB uV m for the electric field the constant becomes 30 120 1010g 120 7 115 8 QUATION 3 dB uV m dB uV AF EQUATION 4 dB u V m 120 V m 10 20 EQUATION 5 dB uA m dB uV m 51 5 The magnetic field strength is related to the electric field strength via the characteristic impedance of free space When the transformation is made to decibels the constant becomes 2010g 1207 51 5 29 QUATION 6 dB u A m 120 A m 10 20 EQUATION 7 dB W m 10 log V m A m EQUATION 8 dB mW m2 dB W m2 30 0 EQUATION 9 dB pT dB uA m 2 0 The magnetic flux density B in T is related to the magnetic field strength H in A m by the permeability of the medium in H m For free space the permeability is Uo 47 10 H m Converting from T to pT and from A m to uA m and taking the log the constant becomes 240 120 2010g 47x107 2 0 30 A
3. 7 99 112 41 16 33 102 05 8 55 7 31 6 35 5 60 4 99 4 50 4 08 3 75 3 46 3 22 11 22 44 89 101 00 a 19 95 124 69 9 18 8 43 7 78 25 EI E eee B EI EI Ea 16 TABLE 5 MODEL 3161 03 POWER REQUIREMENTS AT 1 METER Field Strength AF Seem em 100 V m 200 V m 500 V m 15 38 96 12 17 TABLE 6 MODEL 3161 03POWER REQUIREMENTS AT 3 AND 10 METERS Field Strength at 3 Meters Field Strength at 10 Meters eee eee IEEE Pom m me ee eee eee Cas fur e ue fes ue jeje GIORIO eee 65 34 60 71 86 15 38 96 12 E 7 EA E EA ES ES EA 18 4 0 Mounting Instructions Before connecting any components follow the safety information in the ETS Lindgren Product Information Bulletin included with your shipment CAUTION The Model 3161 Series antennas are precision measurement devices Handle your antenna with care gt Horizontal and vertical polarizations can be achieved by rotating the antenna from one mount to the other The Model 3161 Series Octave Bandwidth Pyramidal Horn Antenna is equipped with a standard 1 4 20 mount The mount is placed so as not to interfere with incoming electromagnetic energy Once mounted remove the red cover from the Type N connector and attach a cable between the antenna and a transmitting receiving RF device Mount to 4 TR Model 3161 Series antennas mount directly to an ETS Lindgren 4 TR Tripod no additional hardware is required
4. Model 3161 Series Octave Bandwidth Pyramidal Horn Antenna User Manual SETS LINDGREN An ESCO Technologies Company ETS Lindgren L P reserves the right to make changes to any product described herein in order to improve function design or for any other reason Nothing contained herein shall constitute ETS Lindgren L P assuming any liability whatsoever arising out of the application or use of any product or circuit described herein ETS Lindgren L P does not convey any license under its patent rights or the rights of others Copyright 1992 2010 by ETS Lindgren L P All Rights Reserved No part of this document may be copied by any means without written permission from ETS Lindgren L P Trademarks used in this document The ETS Lindgren logo is a trademark of ETS Lindgren L P Revision Record MANUAL MODEL 3161 Part 399193 Rev D Initial Release September 1992 Edits updates March 2002 September 1092 ES Edits updates February 2001 March e Table of Contents Notes Cautions and Warnings V B Ta pi goe Te i Le HHT 7 ETS Lindgren Product Information Bulletin sse eee eee 7 2 0 MaintenanG r steed ten ne du auda ad at dala a saal 9 Ann al Calib ratings do le de la na ia ata alta 9 Service PFOCCAUISS rammen iat sata aaa adina uta qualit eat ati alia aria 9 3 0 Specifications 11 Electrical SpeCITICANONS clericali ne wide e So la ei 11 Physical Spe
5. able of generating high electric field strengths using little power For a given electric field strength the required power can be computed using the transmission equation Field Strength Distance in meters 30 x Numeric Gain Power Transmitted IRP R 30g The typical power requirements in Watts for a given field strength computed from the transmission equation for the Model 3161 Series are shown in Table 1 through Table 6 Distance is measured from the aperture of the antenna 12 TABLE 1 MODEL 3161 01 POWER REQUIREMENTS AT 1 METER Field Strength AF dB 1 m JO KAL Cico pa pe Ea ca Kad ka Co EN NI EN N O I o CO EX D D 13 TABLE 2 MODEL 3161 01 POWER REQUIREMENTS AT 3 AND 10 METERS Field Strength at 3 Meters Field Strength at 10 Meters fe me mo oe me IEKE IEKE DO a om oe om fof IL ee e GG 637 2 ES 1 3 DOI Tel Tee DORE e etet E pete e ee FOGLI eee pe oe oe of EX 1703 2103 66 5 57 0 9 8 4 2 39 8 36 4 33 6 31 5 29 7 28 3 27 2 E EJ ES ES ES B 7 E E E 14 TABLE 3 MODEL 3161 02 POWER REQUIREMENTS AT 1 METER Field Strength AF dB 1 m 12 88 80 50 15 TABLE 4 MODEL 3161 02 POWER REQUIREMENTS AT 3 AND 10 METERS Field Strength at 3 Meters Field Strength at 10 Meters eee eee EEKE jeje eee 14 29 57 16 128 62 25 41 158 79 22 38 139 90 EE DE eee IEEE IEEE 1
6. cal VSWR The following plot of VSWR shows the antenna coax to waveguide adapter assembly KV 1 0 16 f GHz 14 23 Typical Measured and Theoretical Gain and Antenna Factor Following is a plot of computed and measured gain and antenna factor versus frequency The measured and computed results agree within 3 dB which is typical of pyramidal horns Differences are attributed to inevitable systematic measurement error The left vertical scale is for the gain measured in dBi and the right vertical scale is for the antenna factor in dB m Gain is computed from antenna factor using G dB 20 log fom AF p 30 22 f GHz Lea o O Lea SN N N q 16 14 12 10 u L ap av lapl NIVO 24 Typical Half Power Beamwidth Following is a plot of the half power beamwidth HPBW versus frequency The information provides the size of the Equipment Under Test EUT that can be illuminated without scanning The size of the EUT can be obtained as EUT 2 J Distance tan are Distance is the distance between the EUT and the aperture of the antenna f GHz SS 9 Z 9 D Ax E see1bep MAdH 25 This page intentionally left blank 26 6 0 Radiated Emissions Measurements Measure Ambient Field Strength Values 1 Install the antenna where measured field strength values are desired 2 Adjust the desired orientation of the antenna both bore site directio
7. cifications iaca tit ma tecuci d ut 12 Power Requirements esa rare ic aa ada pia aaa aaa 12 Table 1 Model 3161 01 Power Requirements at 1 Meter 13 Table 2 Model 3161 01 Power Requirements at 3 and 10 Meters 14 Table 3 Model 3161 02 Power Requirements at 1 Meter 15 Table 4 Model 3161 02 Power Requirements at 3 and 10 Meters 16 Table 5 Model 3161 03 Power Requirements at 1 Meter 17 Table 6 Model 3161 03Power Requirements at 3 and 10 Meters 18 4 0 Mounting Instructions 1rrrrrrrrriiiiiri iii 19 Mount 19 Mount to 7 TR and Mast eee 20 Mount 10 22 BOOM ase P o ata utd Calin ete 21 Oje ler Dal lana 23 tR STT Ke enceinte Daia 23 Typical Measured and Theoretical Gain and Antenna Factor 24 Typical Half Power Beamwidth onee ss 25 6 0 Radiated Emissions Measurements 27 Measure Ambient Field Strength Values nun e 27 GORVEISION Formula S werende autant a 28 BUSONI SSSR ee ill ii 28 Ebano 29 Sele Re PO ati 29 EON ASS ana en a ul Aa eat ol fl dati aan da 29 POUONO NN 29 FC AUIO IN Orson lille 30 QUATION AEN 30 QUATION On nd tee ee est eue ne 30 Selle rgart 30 Appendix A Warranty anna nananennenansenennnnenennnennennenene 31 Notes Cautions and Warnings CAUTION Note Denotes helpful information intended to provide tips for better use of the product Ca
8. n and polarization 3 Connect the output connector of the antenna to the input of the receiving system using a low VSWR low loss 50 Q coaxial cable 4 Set desired measurement frequency Make sure that the selected frequency is one that can be used with the antenna that is connected to the system 5 Measure the RF voltage Va referenced to the input port of the receiving system The units of the measurement should be in decibels referenced to 1 microvolt dB uV If the units of measurements are millivolts they should be converted to dB uV by V 20 log RF voltage in microvolts V 20 log Vi 6 Determine the field strength at the frequency of observation by adding the voltage reading on the receiving system in dB uV to the antenna factor in dB m RF Voltage dB uV Antenna Factor dB m Field Strength dB uV m Es Va AR The losses of the coaxial cable A should be included in the computations In this case the previous equation becomes RF Voltage dB uV Cable Loss dB Antenna Factor DB m Field Strength dB uV m Ea gt Va A AF 27 Conversion Formulas Following are some useful conversion formulas including how the constants are obtained QUATION 1 dBm dB uV 107 The power is related to the voltage and the system impedance as In a 50 Q system the previous equation becomes 10log P 201log Y 10log 50 Converting from dB to dBm for power and from dB V
9. ppendix A Warranty gt See the Product Information Bulletin included with your shipment for the complete ETS Lindgren warranty for your Model 3161 Series DURATION OF WARRANTIES FOR MODEL 3161 SERIES All product warranties except the warranty of title and all remedies for warranty failures are limited to two years Product Warranted Duration of Warranty Period Model 3161 Series 2 Years Octave Bandwidth Pyramidal Horn Antenna 31
10. rsion coated and painted for protection against corrosion and changes in the weather The Model 3161 Series can be used as transmit or receive antennas The 50 Q input impedance is matched to most standard coax cables In receiving applications the antennas are matched to the free space impedance 377 Q Typical performance data is provided beginning on page 23 Methodology for radiated emissions measurement is described on page 27 ETS Lindgren Product Information Bulletin See the ETS Lindgren Product Information Bulletin included with your shipment for the following e Warranty information Safety regulatory and other product marking information e Steps to receive your shipment e Steps to return a component for service ETS Lindgren calibration service ETS Lindgren contact information This page intentionally left blank 2 0 Maintenance Before performing any maintenance follow the safety information in the ETS Lindgren Product Information Bulletin included with your shipment Maintenance of the Model 3161 Series is limited to external components such as cables or connectors WARRANTY If you have any questions concerning maintenance contact ETS Lindgren Customer Service e When not in use the Model 3161 Series Octave Bandwidth Pyramidal Horn Antenna should be stored on a shelf face down to keep dust out of the feed areas e If the Model 3161 Series is used outdoors the antennas
11. should be checked for water accumulations Water has a high dielectric constant and can alter performance e If an antenna is dropped the feed horn joint should be checked for misalignment Annual Calibration See the Product Information Bulletin included with your shipment for information on ETS Lindgren calibration services Service Procedures For the steps to return a system or system component to ETS Lindgren for service see the Product Information Bulletin included with your shipment This page intentionally left blank 10 3 0 Specifications Electrical Specifications The VSWR indicated in the following table is that of the pyramidal horn antenna and coax to waveguide adapter The VSWR of the antenna by itself is of the order of 1 1 1 e The maximum continuous power indicated in the following table is mainly limited by the coax to waveguide adapter The antenna itself is capable of handling continuous power on the order of 10 Watts to 10 Watts 1 0 GHz 2 0 GHz 4 0 GHz to to to 2 0 GHz 4 0 GHz 8 0 GHz Antenna 15 40 dB 1 m 16 85 dB 1 m 20 60 dB 1 m Factor VSWR 2 1 6 1 5 1 3 With Feed Maximum Continuous 550 W 500 W 250 W Power Connector Type Type N female Type N female Type N female Frequency Range 11 Physical Specifications Waveguide Number Power Requirements The Model 3161 Series Octave Bandwidth Pyramidal Horn Antenna is an efficient transmitting antenna cap
12. ution Denotes a hazard Failure to follow instructions could result in minor personal injury and or property damage Included text gives proper procedures Warning Denotes a hazard Failure to follow instructions could result in SEVERE personal injury and or property damage Included text gives proper procedures gt See the ETS Lindgren Product Information Bulletin for safety regulatory and other product marking information This page intentionally left blank vi 1 0 Introduction The ETS Lindgren Model 3161 Series Octave Bandwidth Pyramidal Horn Antenna is designed specifically for emissions and immunity testing over the 1 GHZ to 8 GHZ frequency range Characteristics of the Model 3161 Series include linear polarization medium gain medium half power beamwidth in both the horizontal and vertical planes low VSWR over the recommended operating frequency range and antenna factors constant within 2 dB The wide bandwidth was selected to allow use with octave bandwidth traveling wave tube TWT amplifiers without the need to change antennas over the band Each Model 3161 is furnished with a high performance low VSWR Type N coax to waveguide adapter This adapter limits antenna power handling capacity and may be removed if a power source with waveguide output is available In such a configuration fields in excess of 10 000 V m at 10 meters are obtainable The Model 3161 Series is constructed of aluminum and then is conve
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