Patch Antenna Design

[@KeremGünay-c2z]

such consice and useful information. I'm all set for my patch antenna design. Thanks!

[@myetis1990]

good job Zach, thank you. I always feel comfortable when I see a numeric example if the Altium has a feature as a calculator then you can show us an example using it.

[@Zachariah-Peterson]

It's not available as a feature inside of Altium, but I created a calculator that helps with this, you can find a link in the description

[@LightningHelix101]

Good vid! Thanks for the blog.

[@AltiumAcademy]

Glad you enjoyed it!

[@jrthhfdff]

Any advice on different feed methods? Trying to figure out how to feed the patch through the substrate so the traces aren't on the same side as the patch.

[@Zachariah-Peterson]

Excellent question, I'll make a video on it today with an example

[@chandanbiswas4322]

Hi Zach, What are the unit of length & Width and as well as for the frequency? and should we take speed of light in m/sec of km/h?

[@Zachariah-Peterson]

For the ratio quantities, it does not matter as long as the quantities in a ratio are the same units. For the other quantities, just pick a standard unit system, MKS or CGS will work fine. Being a physicist I always use MKS.

[@osmanpasha_diy]

How do you calculate trace width from the impedance of q-wave?

[@Zachariah-Peterson]

If you know the impedance of the Q-wave section, you can get the width from trial and error in a calculator app, that would be the easiest way. Just start plugging in values and keep making the width smaller until the trance impedance matches the impedance of the Q-wave section. The layer stack manager in Altium Designer can also do it, just design your layer stack and enter the impedance you want and it will automatically calculate the trace width that gives this impedance.

[@osmanpasha_diy]

@@Zachariah-Peterson thank you!

[@WinChester_Ltd]

Hi Zach, is this necessary to use a quarter wave transformer and what is the length of it? Can connect 50 Ohm trace directly to antenna? And about Higher order frequencies, what should I put instead of i,j,k, just random numbers? Thank you for the video, you did a great job!!! 👏

[@Zachariah-Peterson]

Thank you. Quarter wave transformer will work, but you could use any fractional wavelength transformer as long as the resulting width of the transformer line is not too thin to be fabricated. You can only connect a 50 Ohm trace directly to the antenna as long as the antenna's input impedance is also 50 Ohms, which it never is unfortunately. The same principles apply for all higher order frequencies.

[@LightningHelix101]

The auto zoom is a little distracting, but the board and audio are clear.

[@hjioooo]

thanks for the video!

[@AltiumAcademy]

Sure thing!

[@로제니]

so much help!

[@pyrokinetikrlz]

thanks for the tutorial :)

[@alfiz9943]

Please make video about inverted F antenna

[@Zachariah-Peterson]

It's in the pipeline

[@chandanbiswas4322]

Hi Zach, why GND block the radiation of the antenna?

[@ThermalWorld_]

Because it reacts like a capacitor on the alternating current "negative flipp and positive flipp" by blocking and cancelling the energy emitted by the antenna.

[@87Spectr]

It was interesting and useful!

[@AltiumAcademy]

Glad to hear that!

[@MichaelKingsfordGray]

Of course, this is simply a gross first-order approximation. To model it exactly, one needs QED.

[@Zachariah-Peterson]

I guess if you want to get really exact at the sub-atomic level, then sure use quantum electrodynamics. At the macroscopic level Maxwell's equations work just fine.

[@MichaelKingsfordGray]

@@Zachariah-Peterson Multi GHz or THz are not at the macroscopic level. Maxwell Equations fail progressively at this extreme, and beyond. You may as well get it 100% correct, rather than using an approximation, is what I am urging.

[@Zachariah-Peterson]

@@MichaelKingsfordGray GHz and THz most certainly are at the macroscopic level. The "Q" in QED means "quantum", you do not need quantum electrodynamics to describe propagation of electromagnetic waves on mm or cm length scales. A single wavelength would encompass many multiples of Avogadro's number of particles, that is the definition of macroscopic phenomena. QED is applicable in the case where the electromagnetic field interacts with individual sub-atomic particles, you don't need QED to describe wave propagation in media with Avogadro's number worth of particles. Physicists and engineers did all of this successfully in the 1800's and 1900's with only Maxwell's equations, before quantum mechanics was conceived or widely understood.

[@emmetray9703]

0.824 * h, you forgot h when calculating L

[@Zachariah-Peterson]

Good catch, you're right

[@UtsavGpt]

Great video, please improve the white balancing. Looks very washed out.

[@AltiumAcademy]

Noted!