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a-130


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         FAR-FIELD
 ANTENNA MEASUREMENTS
         WITH THE
HP 8510 NETWORK ANALYZER



                    John W. Boyles
             Network Measurements Division
             1400 Fountain Grove Parkway
                Santa Rosa, CA 95401




 RF & Microwave
 Measurement
 Symposium
 and
 Exhibition


 r/ifl'l   HEWLETT
 ~~ PACKARD




                 www.HPARCHIVE.com
ABSTRACT:

This paper describes the application of the HP 8510 network analyzer to far-field
antenna measurements. Several hardware configurations are described, including a
newly developed configuration for making antenna measurements using harmonic
mixers. Short-distance, long-distance, and radar cross-section ranges are described,
and measurement examples are given for each category.

In addition, the paper discusses the use of time domain gating as a means of
eliminating the effects of ground path reflection, which is one of the major prob-
lem areas encountered in far-field antenna measurements. Several measurement
examples are given that show the improvements that can occur using gating.




Author: John W. Boyles, Applications Engineer, Hewlett-Packard Network Measure-
ment Division, Santa Rosa, CA.      He received a BS degree from North Carolina
State University in 1978 and a MS degree from the Georgia Institute of Technology
in 1979, both in electrical engineering. With HP since 1979, he joined as a R&D
engineer doing microwave and analog circuit design, and was one of the designers
of the HP 8340A synthesized sweeper. In 1984, he became an applications engineer
for the high performance network analyzers, specializing in the areas of time do-
main network measurements, and antenna and radar cross-section measurements.




                                      www.HPARCHIVE.com
                                                      This paper describes the application of the
                                                      HP 8510 Network Analyzer to far-field
                                                      antenna measurements.


          FAR-FIELD
  ANTENNA MEASUREMENTS
          WITH THE
 HP 8510 NETWORK ANALYZER




                                             4445

                                                      The HP 8510 network analyzer is a high
                                                      performance stimulus/response measurement
                                                      system that consists of a microwave
                                                      source, a test set, and the HP 8510A as
                                                      receiver and system controller. There are
                                                      several different measurement configura-
                                                      tions available that can be customized to
                                                      specific applica tions. Shown in this pic-
                                                      ture are the HP 8510A network analyzer,
                                                      HP 8511A Frequency Converter, and HP
                                                      8340A Synthesized Sweeper.




                                             4446

                                                      The HP 8510 can be configured as a 4-
                                                      input phase locked receiver that is capable
     HP 8510 CAPABILITY                               of measuring magnitude and phase. For
    FOR ANTENNA TESTING                               antenna testing, its broadband performance
                                                      and wide dynamic range make it applicable



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