[time-nuts] Smaller, and smaller antennas

[jimlux]

On 3/5/19 9:33 AM, Gregory Beat via time-nuts wrote:
> No, this is not an “L-band”, GNSS antenna ... BUT it demonstrates the shrinking size.
> 
> NEW Molex 206513 Antenna for 2.4 GHz, 3x3x4 mm in size.
> Less than $1.00 for quantity 1, both Mouser and Digi-Key now stocking.
> https://www.digikey.com/en/product-highlight/m/molex/2-4-ghz-ceramic-antenna
> 
> Molex’s 206513 series is a 2.4 GHz embedded ceramic antenna with high efficiency over 55% on all frequency bands. This miniature SMT ceramic component requires a very small (4 mm x 4 mm) keep-out area and is designed to be mounted directly at the corner of the main device PCB. It has a frequency range of 2.4 GHz - 2.5 GHz, return loss of <-6 dB, and peak gain (max) 3.6 dBi. It features an omnidirectional radiation pattern.
> 

One needs to carefully look at the 55% claim with these kinds of things. 
  Are they including that in the gain, 50% efficiency is a gain hit of 
3dB? Peak gain of 3.6dBi (is that circular or linear?) (is that 
directivity, or gain?). Does the efficiency count the 25% of the power 
reflected back from the 6dB return loss?

https://www.molex.com/pdm_docs/ps/2065130001-PS.pdf is more about packaging

https://www.molex.com/pdm_docs/as/2065130001-AS.pdf has the antenna 
patterns..



Also, what's the axial ratio off boresight...