How to choose a 2.4GHz embedded antenna for FTTH terminal

Model FOT FTTH series 2.4GHz Embedded Antenna

  Using airgain’s patented technology, the FOT FTTH equipment antenna provides a high gain, on-board antenna solution for Wi-Fi and ISM band applications. As embedded antenna solutions become the focus of next generation wireless product design, the Model provides the flexibility of an embedded antenna without sacrificing performance.

FOT Model embedded antenna

FOT Model embedded antenna

  The FOT FTTH equipment 2.4GHz antenna was designed to accommodate most WLAN access point applications, such as routers and gateways, with a low-cost, low profile, and enhanced performance PCB component design.

Case study: PCB Mounting

  FOT Blog is sharing a recommended layout of a design implementation for antenna and PCB broad. Embedded antenna performance is fairly independent of its location on the PCB, if close to a PCB edge. Place the Embedded antenna parallel to, and centered 3.0 mm away from the edge of the PCB. Performance is improved if Pin 1 is placed no closer than 15 mm from the nearest orthogonal edge of the PCB. 

Embedded Antenna: Top view of a design layout

Embedded Antenna: Top view of a design layout

  A larger distance between Pin 1 and the orthogonal edge of the PCB is often better. When Pin 2 is the closest pin to the nearest orthogonal edge of the PCB, Pin 1 should be placed no closer than 35 mm from that same orthogonal edge of the PCB. Performance tests have had the Embedded antenna mounted onto a 1 mm, 4 layer, FR4 PCB. Pin 1 through hole is designed to be 50 ohms. Pin 2 through hole is a direct connection to RF ground (recommended).

  The important mounting constraints on a PCB are shown above.

Features

  The Model N2430GNS is defined by the following features:

  • IEEE 802.11 b/g/n compatible
  • PCB mounting, low profile design
  • 5dBi @2.44 GHz, Peak Gain
  • Low Cost, High performance
  • Reliable Through-Hole mounting

Specification and Interface

StandardIEEE 802.11n and 802.11 b/g
Frequency Range2.4 to 2.49 GHz
Peak Gain5dBi @2.44 GHz
VSWR0.084027777777778
Feed Impedance50 Ohms
Power Handling30 dBm
InterfaceTwo, 1 mm x 2.4 mm, Through hole pins for 50 ohm microstripline trace
Antenna Dimensions (LxWxH)34.0 x 5 x 12.2 (mm)
Weight1.5 g (0.053 oz)
TemperatureOperating: -40°to +75°C Storage:: -40°to +85°C
Humidity0 to 95%, non-condensing

Radiation Patterns

FOT 2.4GHz Embedded Antenna axis orientation for radiation pattern

FOT 2.4GHz Embedded Antenna axis orientation for radiation pattern

  Data shown is a Model 2.4GHz Embedded Antenna Reference (designed to be mounted on PCB), covered with a 2.5mm thick ABS plastic sheet.

2.4GHz Radiation Patterns

2.4GHz Radiation Patterns

ROHS

  Model FOT FTTH equipment Antennas are RoHS compliant.

Application

  1.   New PCB designs
  2.   IEEE 802.11a/b/g and n applications

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