Photo: Aditya Mukherjee
In an application it was required to use 6 different antennas at 6 nearby locations one at a time as the Bluetooth/WiFi antenna for an Asus Tinker Board or any similar single board computer with a detachable RF front end (also a modified Raspberry Pi). To serve that purpose this 6 way switch was designed and built. It has one common port which is connected to the RF port on the Tinker board and 6 selectable ports to connect the antennas. To power the device and select the port it has a 10 pin FRC connector which plugs into the GPIO strip of the Tinker board through a FRC to female header converter. One among the 6 selectable ports is selected by setting a particular bit pattern in its 3 bit control channel (excluding 000 & 111). The response time for RF switching is around 5 microseconds.
A single monolithic component is used for the switching purpose which greatly reduced the BOM, PCB area, dev time and design complexity – RFSW6062 by Qorvo.
Entire board is matched to 50 Ohm
Features:
- 5 MHz to 3000 MHz operation
- Excellent insertion loss and decent isolation performance
- Compatible with 3.3V logic
- No DC blocking
- 2000V HBM ESD Rating on All Ports
- 3V to 5V operation
- Low power device (≈100μA current draw)
- Source: LINK
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