Antenna pattern beam squint and sector power ratio

This page covers antenna pattern beam squint and sector power ratio. It mentions comparison between horizontal pattern beam squint and sector power ratio.

Refer mechanical tilt vs electrical tilt which describes how electrical tilt takes care of issues such as pattern blooming, squint resulted due to mechanical tilt.

Antenna Beam Squint

beam squint

Beam squint is defined as the difference between the mechanical boresite and the electrical boresite of an antenna. The same has been depicted in the figure-1.

The mechanical boresite is defined as being perpendicular to the antenna's back tray while electrical boresite is defined as the mid-point of the 3 dB beamwidth.

Antenna sector power ratio

sector power ratio

Sector Power Ratio (SPR) is another measure of an antenna's ability to minimize interference. SPR is an expression of the RF power radiated outside the sector versus the RF power radiated and retained within the sector.

sector power ratio equation

The best performing antenna designs provide SPRs of 3% to 4% while typical designs using dipole or patch elements yield an SPR of about 8%. The sector power ratio equation is also mentioned above.

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