PCB Antenna Width

RE: PCB Antenna Width

mstrouse — Fri, 17 Apr 2015 19:40:47 GMT

Perhaps another way for you to look at the antenna is as an impedance matching device. Assume that the output impedance of the radio is 50ohm (this can really be any value), and that the input impedance to free space (air / atmosphere / whatever you want to call it) is about 377ohm (see en.wikipedia.org/.../Impedance_of_free_space). It's a matching device, and should not be considered a stripline. Discussions about the length of the antenna, "shape" of the antenna, etc are for another day.

RE: PCB Antenna Width

Asbjørn — Fri, 17 Apr 2015 09:40:44 GMT

The shape of the antenna used is decided by tuning the antenna on the board. So we start with a basic length at about 1/4 of a wavelength and the tune the antenna manually. We follow the steps shown in this white paper. So an antenna cannot be implemented as a transmission line.

RE: PCB Antenna Width

wemme — Wed, 15 Apr 2015 02:19:50 GMT

Hello, PCB antennas are not transmission lines. The impedance of the antenna can almost be anything and needs to be matched to the transmission line (normally 50ohms) from the balun (chip or discrete). sorry not the greatest answer.

Regards Bart

RE: PCB Antenna Width

Locky — Wed, 15 Apr 2015 02:03:47 GMT

You have a 4 - layer board:

how thick is your copper plating? 1oz?
What thickness is your dielectric material?
What style of transmission trace: Microstrip, Co-planar, Co-planar with Ground?