Antenna Standards
Frequency (MHz) | Category | Maximum beamwidth to 3 dB points1 (included angle in degrees) | Minimum antenna gain (dbi) | Minimum radiation suppression to angle in degrees from centerline of main beam in decibels | ||||||
5° to10° | 10° to 15° | 15° to 20° | 20° to 30° | 30° to 100° | 100° to 140° | 140° to 180° | ||||
932.5 to 935 | A | 14.0 | n/a | n/a | 6 | 11 | 14 | 17 | 20 | 24 |
B | 20.0 | n/a | n/a | n/a | 6 | 10 | 13 | 15 | 20 | |
941.5 to 944 | A | 14.0 | n/a | n/a | 6 | 11 | 14 | 17 | 20 | 24 |
B | 20.0 | n/a | n/a | n/a | 6 | 10 | 13 | 15 | 20 | |
952 to 9602 3 | A | 14.0 | n/a | n/a | 6 | 11 | 14 | 17 | 20 | 24 |
B | 20.0 | n/a | n/a | n/a | 6 | 10 | 13 | 15 | 20 | |
1,850 to 2,5004 | A | 5.0 | n/a | 12 | 18 | 22 | 25 | 29 | 33 | 39 |
B | 8.0 | n/a | 5 | 18 | 20 | 20 | 25 | 28 | 36 | |
3,700 to 4,200 | A | 2.7 | 36 | 23 | 29 | 33 | 36 | 42 | 55 | 55 |
B | 2.7 | 36 | 20 | 24 | 28 | 32 | 32 | 32 | 32 | |
B | 2.2 | 38 | 21 | 25 | 29 | 32 | 35 | 39 | 45 | |
5,925 to 6,4255 | A | 2.2 | 38 | 25 | 29 | 33 | 36 | 42 | 55 | 55 |
B1 | 2.2 | 38 | 21 | 25 | 29 | 32 | 35 | 39 | 45 | |
B2 | 4.1 | 32 | 15 | 20 | 23 | 28 | 29 | 60 | 60 | |
6,525 to 6,8755 | A | 2.2 | 38 | 25 | 29 | 33 | 36 | 42 | 55 | 55 |
B1 | 2.2 | 38 | 21 | 25 | 29 | 32 | 35 | 39 | 45 | |
B2 | 4.1 | 32 | 15 | 20 | 23 | 28 | 29 | 60 | 60 | |
6,875 to 7,125 | A | 2.2 | 38 | 25 | 29 | 33 | 36 | 42 | 55 | 55 |
B1 | 2.2 | 38 | 21 | 25 | 29 | 32 | 35 | 39 | 45 | |
B2 | 4.1 | 32 | 15 | 20 | 23 | 28 | 29 | 60 | 60 | |
10,550 to 10,6807 | A | 3.5 | 33.5 | 18 | 24 | 28 | 32 | 35 | 55 | 55 |
B | 3.5 | 33.5 | 17 | 24 | 28 | 32 | 35 | 40 | 45 | |
10,565 to 10,615 | n/a | 360 | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a |
10,630 to 10,6808 | n/a | 3.5 | 34 | 20 | 24 | 28 | 32 | 35 | 36 | 36 |
10,700-11,7005 | A | 2.2 | 38 | 25 | 29 | 33 | 36 | 42 | 55 | 55 |
B | 3.5 | 33.5 | 17 | 24 | 28 | 32 | 35 | 40 | 45 | |
12,200 to 13,2509 | A | 1.0 | n/a | 23 | 28 | 35 | 39 | 41 | 42 | 50 |
B | 2.0 | n/a | 20 | 25 | 28 | 30 | 32 | 37 | 47 | |
17,700 to 18,820 | A | 2.2 | 38 | 25 | 29 | 33 | 36 | 42 | 55 | 55 |
B1 | 2.2 | 38 | 20 | 24 | 28 | 32 | 35 | 36 | 36 | |
B2 | 3.3 | 33.5 | 18 | 22 | 29 | 31 | 35 | 55 | 55 | |
18,920 to 19,70010 | A | 2.2 | 38 | 25 | 29 | 33 | 36 | 42 | 55 | 55 |
B1 | 2.2 | 38 | 20 | 24 | 28 | 32 | 35 | 36 | 36 | |
B2 | 3.3 | 33.5 | 18 | 22 | 29 | 31 | 35 | 55 | 55 | |
21,200 to 23,6007 11 | A | 3.3 | 33.5 | 18 | 26 | 26 | 33 | 33 | 55 | 55 |
B1 | 3.3 | 33.5 | 17 | 24 | 24 | 29 | 29 | 40 | 50 | |
B2 | 4.5 | 30.5 | 14 | 19 | 22 | 24 | 29 | 52 | 52 | |
24,250 to 25,25010 | A | 2.8 | 38 | 25 | 29 | 33 | 36 | 42 | 55 | 60 |
B | 2.8 | 38 | 20 | 24 | 28 | 32 | 35 | 36 | 45 | |
31,000 to 31,30012 13 | n/a | 4.0 | 38 | n/a | n/a | n/a | n/a | n/a | n/a | n/a |
B | n/a | 38 | 20 | 24 | 28 | 32 | 35 | 36 | 36 | |
71,000 to 76,000 (co-polar) 14 | N/A | 2.2 | 38 | 22 | 28 | 32 | 35 | 37 | 55 | 55 |
71,000 to 76,000 (cross-polar) 14 | N/A | 2.2 | 38 | 35 | 35 | 40 | 42 | 47 | 55 | 55 |
81,000 to 86,000 (co-polar) 14 | N/A | 2.2 | 38 | 22 | 28 | 32 | 35 | 37 | 55 | 55 |
81,000 to 86,000 (cross-polar) 14 | N/A | 2.2 | 38 | 35 | 35 | 40 | 42 | 47 | 55 | 55 |
92,000 to 95,000 | N/A | 0.6 | 50.0 | 36 | 40 | 45 | 50 | 55 | 55 | 55 |
1 If a licensee chooses to show compliance using maximum beamwidth to 3 dB points, the beamwidth limit shall apply in both the azimuth and the elevation planes.
2 Except for Multiple Address System frequencies listed in §§ 101.147(b)(1) through (b)(4) , where omnidirectional antennas may be used.
3 Antennas used at outlying stations as part of a central protection alarm system need conform to only the following 2 standards:
4 Omnidirectional antennas may be authorized in the band 2150-2160 MHz.
5 These antenna standards apply to all point-to-point stations authorized after June 1, 1997. Existing licensees and pending applicants on that date are grandfathered and need not comply with these standards.
6 These antenna standards apply to all point-to-point stations authorized on or before June 1, 1997.
7 For stations authorized or pending on April 1, 2003, the minimum radiation suppression for Category B is 35dB in the 10,550-10,680 MHz band and 36 dB in the 21,200-23,600 MHz band for discrimination angles from 100° to 180°.
8 These antenna standards apply only to DEMS User Stations licensed, in operation, or applied for prior to July 15, 1993.
9 Except for Temporary-fixed operations in the band 13200-13250 MHz with output powers less than 250 mW and as provided in § 101.147(q) , and except for antennas in the MVDDS service in the band 12.2-12.7 GHz.
10 DEMS User Station antennas in this band must meet performance Standard B and have a minimum antenna gain of 34 dBi. The maximum beamwidth requirement does not apply to DEMS User Stations. DEMS Nodal Stations need not comply with these standards. Stations authorized to operate in the 24,250-25,250 MHz band do not have to meet these standards, however, the Commission may require the use of higher performance antennas where interference problems can be resolved by the use of such antennas.
11 Except as provided in § 101.147(s) .
12 The minimum front-to-back ratio shall be 38 dBi.
13 Mobile, except aeronautical mobile, stations need not comply with these standards.
14 Antenna gain less than 50 dBi (but greater than or equal to 38 dBi) is permitted only with a proportional reduction in maximum authorized EIRP in a ratio of 2 dB of power per 1 dB of gain, so that the maximum allowable EIRP (in dBW) for antennas of less than 50 dBi gain becomes +55-2(50-G), where G is the antenna gain in dBi. In addition, antennas in these bands must meet the following additional standard for minimum radiation suppression: At angles of less than 5 degrees from the centerline of main beam, cross-polar discrimination must be at least 21 dB.
47 C.F.R. §101.115
For FEDERAL REGISTER citations affecting § 101.115, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.fdsys.gov.