Hi Community, I'm Eugenio Mercol from Argentina.
I'm designing an RF detector, using LTC5505 device.
Short project description and trouble.
It´s a device that can detect RF signal present in the air, once the signal is detected, and the RSSI value exceed a defined value, the device generate a vibratoring advising, sonoric advising an luminic advising.
This device will be carried by the people like a wereable device, and will be carried all the time.
I´m stucked in the antenna design.
I already download the AN91445 Antenna Design and RF Layout Guidelines.pdf document, (that is a really very good document, Thanks to Tapan Pattnayak!!) but I can't see how calculate the MIFA or IFA length for the frecuencies beetwen 300 to 450 Mhz.
Project Details.
PCB type and Size: two sides, 30mm x 35mm (keychain type)
Device Size: 30mm, x 45mm
Kind of components used: SMD
Power Source: Alkaline 12V A23S cell
Operation Voltage: 3V
Space defined for the antenna in the PCB: 13mm x 22mm.
Range of detection needed: up to 20 meters
Frecuencies detected: beetwen 300 to 450 Mhz
Only for RF reception
Never will be an RF transmisor.
It will be carried by the people, inside the pants pocket.
Questions
1* - Based in the description about, antenna space available, place where the device will be carried by the persons, frequency range, and sensibility needed for up to 20 meters detection. What kind of antenna do you recommend to me, MIFA or IFA?
2* - Depending the anntena selected. How Can I calculate the shape kind and sizes of the antenna?
Thank you very much!
