Antenna Specifications

FCC ID: LDK102054E

Parts List/Tune Up Info

Download: PDF
FCCID_645499

9/08/2004 AIR-AP1131AG Antenna System Design Specification AIR-AP1131AG Antenna System Design Specification 1. Introduction The AIR-AP1131AG access point is a dual band, simultaneous AP supporting 802.11b and 802.11g in the 2.4 GHz band and 802.11a in all the available 5 GHz bands. As such, the product contains a total of 4 antennas. There are two antennas for the 2.4 GHz band and two antennas for the 5 GHz band. The design and operation of these antennas is covered in this document. 3. Antenna Design An inverted-F antenna will be used for both bands. This antenna type is shown in the Figure 1 below. It is formed by bending a monopole antenna down over a ground plane and then driving the resultant antenna away from the grounded end to achieve a 50 Ω driving point impedance. Typically, these antennas are built using a flat plate, rather than a wire, for VSWR bandwidth considerations. A printed version of this document is an uncontrolled copy. Cisco Systems, Inc. Page 1 of 4

9/08/2004 AIR-AP1131AG Antenna System Design Specification Figure 1. Basic Inverted-F antenna Geometry Figure 4 Photograph of the AIR-AP1131AG Antennas with “Break-away” Support Legs. A printed version of this document is an uncontrolled copy. Cisco Systems, Inc. Page 2 of 4

9/08/2004 AIR-AP1131AG Antenna System Design Specification 4. Antenna Specifications from Measurement Results. 5 GHz Inverted-F Antenna Specifications Minimum Typical Maximum Comments 13.7 mm Length (540 mils) 4 mm Width (157 mils) 5 mm Height (197 mils) C770 Material Nickel-Silver 12 mil thick Alloy Mounting Surface Antennas have break- Method Mount away support leg. 2:1 VSWR 5150 MHz - Covers UNII-1, 2, & 3 Bandwidth 5825 MHz Peak gain close to +/- Peak Gain 4 dBi 4.5 dBi 60 degrees from boresight. This spec is included to help describe the Front-to-Back radiation pattern as 10 dB Ratio mostly “away” from the front of the product. 28 dB is the 2.4 GHz-to-5 30 dB 40 dB requirement for radio GHz Isolation operation Table 1. Summary of 5 GHz Inverted-F Antenna Specs A printed version of this document is an uncontrolled copy. Cisco Systems, Inc. Page 3 of 4

9/08/2004 AIR-AP1131AG Antenna System Design Specification 2.4 GHz Inverted-F Antenna Specifications Minimum Typical Maximum Comments 25.4 mm Length (1 inch) 9 mm Width (350 mils) 7 mm Height (0.28 mils) C770 Material Nickel-Silver 12 mil thick Alloy Mounting Surface Antennas have break- Method Mount away support leg. 2:1 VSWR 2400 MHz - Useable for 802.11 Bandwidth 2500 MHz b/g Peak Gain close to Peak Gain 3 dBi +/-45 degrees from boresight. Front-to-Back 10 dB Ratio 30 dB is the 5 GHz-to-2.4 30 dB 40 dB requirement for radio GHz Isolation operation Table 2. Summary of 2.4 GHz Inverted-F Antenna Specifications A printed version of this document is an uncontrolled copy. Cisco Systems, Inc. Page 4 of 4


Document Created: 2006-04-10 09:30:31
Document Modified: 2006-04-10 09:30:31
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC