Sub-6 GHz microwave antennas are those used for medium and long-haul point to point connectivity. These antennas are tuned for operation in the 5.7 to 5.8 GHz frequency range which is the primary unlicensed band for outdoor PTP and PTMP data connections.
One thing you may notice is that microwave band antennas have their electrical specifications displayed differently. Good microwave antenna design aims to facilitate high speed data connectivity in noisy RF environments. This means we’re often dealing with very strict single-band antennas with tight radiation patterns to reject external noise. These antennas have high front-to-back ratios, high inter-port isolation, and high cross-polar discrimination.
Even though in Australia and New Zealand we have strict limits on EIRP, most Sub-6 GHz microwave antennas are very high gain. Limited to +36 dBm (+53 dBm with special licencing) it’s not uncommon for a PTP link to use dishes with gains beyond 30 dBi. This is because while we’re forced to turn down our transmission power the tighter half-power beamwidth and improved side-lobe suppression means we’re able to reject more noise and establish a cleaner signal-to-noise ratio.
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