Co-located Antenna Isolation

Enhanced isolation between co-located antennas is obtained by using FWT Group antenna technology. The dielectrically engineered FWT antennas have a curved and conformal surface. The curved dielectric serves to reject energy, from other antennas, for angles exceeding the Brewster angle. FWT antennas provide 3- 9 dB more isolation than un-treated antennas.
A set of varying diameter FWT dipoles were tested for directivity and gain for polarized and cross polarized pairs of antennas. The calculated values for dipole coupling (From Kraus, Antennas) are shown for a baseline.
The smallest diameter FWT, highest isolation antennas are shown as the blue “X”, the medium diameter FWT antenna is shown as the “Yellow Triangle”
The FWT treated antennas consistently provided a higher level of performance by increasing isolation to over (40 dB) for antennas spaced 7.5 inches @ 2.45 GHz test frequency. This level of performance is about 6 dB (4:1 in higher isolation).

The FWT antennas have a significantly smaller footprint and higher isolation than un-treated traditional antennas. FWT antennas are the perfect choice for repeaters and highly populated radio towers. Active electronics, ASICS, and electronic modules can be directly connect ed to the antenna substrate and antenna elements.