S820E UG PN: 10580-00343 Rev. H 6-3
VNA Mode 6-1 Introduction
Chapter Overview
The S820E Site Master is a Vector Network Analyzer that can measure the
magnitude and phase characteristics of 1-port or 2-port networks, including
cables, antennas, filters, isolators, and attenuators.
VNA mode provides advantages over Cable-Antenna Analyzer Mode via more
advanced measurements, more flexibility, and more calibration choices. The
main advantages are scattering parameter (S-parameter) choices, graph type
choices, and domain choices. In VNA mode, these three measurement choices
can be mixed and matched to provide users with more freedom and flexibility.
For simplicity in Cable-Antenna Analyzer mode, the choices are more fixed
and limited.
Advanced graph types allow you to look at the same device measurements in
many different ways. The ability to display four traces provides you with the
flexibility of comparing various measurements to obtain the results you need
more efficiently.
Advanced graph types such as Group Delay, Real, Imaginary, inverted Smith
Chart, Real Impedance, and Imaginary Impedance are available in the S820E
in addition to the standard graph types, Log Mag, SWR, Phase, and Smith
Chart. The S820E gives you the ability to display four traces overlaid, or they
can be displayed in individual graphs.
In Cable-Antenna Analyzer Mode, the S820E is a two-port, 1-path
instrument. In VNA Mode, the S820E is a full-reversing VNA that is capable
of measuring all S-parameters (S
11
, S
21
, S
22
, and S
12
) of a 2-port device with
a single connection. Being able to measure both forward and reverse
S-parameters allows you to use more advanced calibration methods and to
make more accurate measurements of a 2-port device.
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