[time-nuts] Smaller, and smaller antennas

[Charles Steinmetz]

Ho, hum, yet another fantastical claim for magical gain from a 
tiny-for-wavelength antenna.

See the many discussions of same by Kurt N. Sterba over the last several 
decades, among many, many others.

The laws of physics are stubborn things....

Best regards,

Charles


On 3/5/2019 1:48 PM, jimlux wrote:
> 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...
>
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