Integration Instructions

ManualsBrandsForesight Sports ManualsElectronicsWLAN/Bluetooth host-based multiradio module JODY-W2

Document Information Page 16 of 31

FSS JODY-W263 Integration Instructions Rev 02.docx

www.foresightsports.com

Manufacturer

Series

Remarks

Hirose

U.FL® Ultra Small Surface Mount

Coaxial Connector

Recommended

I-PEX

MHF® Micro Coaxial Connector

Tyco

UMCC® Ultra-Miniature Coax

Connector

Amphenol RF

AMC® Amphenol Micro Coaxial

Lighthorse Technologies, Inc.

IPX ultra micro-miniature RF

connector

Table 9: U.FL compatible plug connector

Typically, the RF plug is available as a cable assembly. Different types of cable assembly are

available; the user should select the cable assembly best suited to the application. The key

characteristics are:

• RF plug type: select U.FL or equivalent

• Nominal impedance: 50 Ω

• Cable thickness: Typically, from 0.8 mm to 1.37 mm. Thicker cables minimize insertion

loss.

• Cable length: Standard length is typically 100 mm or 200 mm; custom lengths may be

available on request. Select shorter cables to minimize insertion loss.

• RF connector on the other side of the cable: for example, another U.FL (for board-to-

board connection) or SMA (for panel mounting)

SMT connectors are typically rated for a limited number of insertion cycles. In addition, the RF

coaxial cable may be relatively fragile compared to other types of cables. To increase application

ruggedness, connect U.FL connector to a more robust connector such as SMA fixed on panel.

☞ A de-facto standard for SMA connectors implies the usage of reverse polarity connectors (RP-

SMA) on end-user accessible Wi-Fi and Bluetooth interfaces to increase the difficulty to replace

the antenna with higher gain versions and exceed regulatory limits.

The following recommendations apply for proper layout of the connector:

• Strictly follow the connector manufacturer’s recommended layout. Some examples are

provided below:

o SMA Pin-Through-Hole connectors require GND keep-out (clearance or void

area) on all the layers around the central pin up to annular pins of the four GND

posts.

o U.FL surface mounted connectors require no conductive traces (that is, clearance,

a void area) in the area below the connector between the GND land pins.

• If the RF pin size on the connector is wider than the microstrip, remove the GND layer

beneath the RF connector to minimize the stray capacitance thus keeping the RF line 50

Ω. For example, the active pin of U.FL connector must have a GND keep-out at least on

the first inner layer to reduce parasitic capacitance to ground.