7-4 Option 100 Fault Location and SRL
Characterizing and Verifying Antenna Systems
Antenna Feedline System
Evaluating the quality of the components within the antenna feedline
system is of utmost importance in today's communication systems. For
example, the attenuation of the transmission lines, along with the
insertion loss of the combiner, determines the majority of loss that occurs
in the transmitting portion of the antenna system. Any imperfections or
damage to this feedline can severely impact the transmission quality of
the entire system.
Figure 7-2 Antenna Feedline System
The antenna system assembly consists of:
• main feedline and jumper cables (coaxial or waveguide)
• connectors or flanges
• hangers
• antenna
It is important to understand the effect the feedline assembly has on the
entire system to help avoid intermittent problems and failures.
Knowing performance parameters such as feedline loss is especially
critical when operating in the 800 to 900 MHz and 1.8 to 2.0 GHz
frequency ranges. At these frequencies, the wavelength is very short and
suffers greater propagation attenuation than the longer wavelength
signals of lower frequencies. Thus, the system performance, in terms of
the power transferred from the transmitter to the antenna, and from the
antenna to the receiver, is characterized by the antenna feedline.
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