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Appendix D Wireless LANs
P-2601HN(L)-F1 Series User’s Guide
313
Antenna Overview
An antenna couples RF signals onto air. A transmitter within a wireless device
sends an RF signal to the antenna, which propagates the signal through the air.
The antenna also operates in reverse by capturing RF signals from the air.
Positioning the antennas properly increases the range and coverage area of a
wireless LAN.
Antenna Characteristics
Frequency
An antenna in the frequency of 2.4GHz (IEEE 802.11b and IEEE 802.11g) or 5GHz
(IEEE 802.11a) is needed to communicate efficiently in a wireless LAN
Radiation Pattern
A radiation pattern is a diagram that allows you to visualize the shape of the
antenna’s coverage area.
Antenna Gain
Antenna gain, measured in dB (decibel), is the increase in coverage within the RF
beam width. Higher antenna gain improves the range of the signal for better
communications.
For an indoor site, each 1 dB increase in antenna gain results in a range increase
of approximately 2.5%. For an unobstructed outdoor site, each 1dB increase in
gain results in a range increase of approximately 5%. Actual results may vary
depending on the network environment.
Antenna gain is sometimes specified in dBi, which is how much the antenna
increases the signal power compared to using an isotropic antenna. An isotropic
antenna is a theoretical perfect antenna that sends out radio signals equally well
in all directions. dBi represents the true gain that the antenna provides.
Types of Antennas for WLAN
There are two types of antennas used for wireless LAN applications.
Содержание P-2601HN(L)-F1 Series
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Страница 8: ...Safety Warnings P 2601HN L F1 Series User s Guide 8 ...
Страница 10: ...Contents Overview P 2601HN L F1 Series User s Guide 10 ...
Страница 19: ...19 PART I User s Guide ...
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Страница 59: ...59 PART II Technical Reference ...
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Страница 110: ...Chapter 6 Wireless P 2601HN L F1 Series User s Guide 110 ...
Страница 130: ...Chapter 8 Routing P 2601HN L F1 Series User s Guide 130 ...
Страница 134: ...Chapter 9 DNS Route P 2601HN L F1 Series User s Guide 134 ...
Страница 178: ...Chapter 16 VoIP P 2601HN L F1 Series User s Guide 178 Figure 81 VoIP SIP SIP Service Provider ...
Страница 202: ...Chapter 16 VoIP P 2601HN L F1 Series User s Guide 202 ...
Страница 206: ...Chapter 17 Logs P 2601HN L F1 Series User s Guide 206 ...
Страница 212: ...Chapter 18 System Monitor P 2601HN L F1 Series User s Guide 212 ...
Страница 220: ...Chapter 21 SNMP P 2601HN L F1 Series User s Guide 220 ...
Страница 232: ...Chapter 26 Backup Restore P 2601HN L F1 Series User s Guide 232 ...
Страница 290: ...Appendix B Setting Up Your Computer s IP Address P 2601HN L F1 Series User s Guide 290 ...
Страница 298: ...Appendix C Pop up Windows JavaScript and Java Permissions P 2601HN L F1 Series User s Guide 298 ...
Страница 322: ...Appendix D Wireless LANs P 2601HN L F1 Series User s Guide 322 ...
Страница 332: ...Appendix F Open Software Announcements P 2601HN L F1 Series User s Guide 332 ...
Страница 344: ...Index P 2601HN L F1 Series User s Guide 344 ...