Antenna-Theory.com Presents: Analysis of the Patch Antenna

Very nicely explained...... can u tell how do impedance matching works using quarter wave transformer ?? and there are other ways to increase BW as well.... :)

nice lecture

visit my channel to watch cst microwave studio tutorials. One of them is about design of a single band patch antenna in CST microwave studio.

Thank you very much for this! I couldn't understand much before watching your lecture. There's just one thing making me wonder: according to Carver and Mink in Microstrip Antenna Technology, the input impedance of a rectangular microstrip antenna with no advance on the feedpoint should be of 120 ohms, not 400 as it is said in the video. I am just starting to understand anything about microstrip antennas, so I don't know who's right here.

Thank you for this video on analysis of patch antenna. Could you please tell me when the same patch antenna is modified to have any fractal shape at its outer edge(may be square cut), how the analysis may be done? Is there empirical formulae for the planar fractal antenna design and analysis?

It was mentioned that there was a high input impedance to the patch antenna so there would be quite a bit of reflection. Would you put a matching network between the transmission line and the antenna?

@SeriousTyro You can put a matching network in there if you would like. Another method is to use a quarter-wavelength transmission line.

@SeriousTyro The txline section of the antenna theory site has this described on the transmission5.php page

THIS IS A VERY USEFUL SERIES, THANKS FOR THE HELP.

Sir, Take a bow ! I guess no book explains as simple as you did. just wonderful...:) Especially the point of feeding microstrip(@ 7,00 min)..out of the world. I would definitely like to connect with you.

This is unbelievable! i have cracked my head reading useless books to understand patch antenna.I must confess that you have put me out of my misery.i tried designing one using CST Microwave studio but i did'nt understand the concepts,now i am going back to the lab.I like the way you explained the fringing effect and how it gives rise to the radiation in the patch.you killed it man!

how can I find the input impedance of the antenna and the microstrip transmission line?

If the tx line is short (less than a tenth of a wavelength), then the antenna measured at the end of the tx line is about the same as the antenna. If the microstrip line is long, then you need to factor it in. It rotates the impedance around the Smith Chart. The only shortcut is if you have a 50 Ohm antenna and a 50 Ohm tx line, then the length of the line doesnt matter & the input impedance remains 50 Ohms. The equations are in the tx line tutorial section of the antenna website.

excellent explanation, kudos.

hello pete and friends. what is the matterials to built small patch antenna . can you help me

Excellent job!

There is the theory of Reciprocity...what is on my mind is what if instead I have an incoming EM wave  I would think that the voltage signs would be opposite on the patch given the same feed? Also, instead replace the t-line feed with a probe feed, what does the E-field or fringing field or voltage potential look like then? Moreover, if I increase the distance of the GND away from the patch because of multiple layers do I essentially reduce the fringing fields? If so, what is the consequence of this?

Great video - love to learn these rules of thumb and real world figures...

My grandpa is the one that designed the micro-strip antenna, Robert Munson, he goes by Bob though.

do you have video related to microstrip filter analysis and design??

expln very well but accent kill me

Thankyou so much.And make more videos related to electronics concepts please!

Can we not feed the antenna along the L side and not the W side. What will happen then?

what will be the main difference if I design it in a single sided pcb-both patch and ground on the same side?

Hello :) very nice and useful video. I am actually looking for resources to understand aperture coupled patch antennas, do you have any advices?

Nobody has explained patch antenna so crisply in the internet. Thanks sir for teaching what's required.

brilliantly insightful, especially the gain of patch antenna, kudos to you !

Great video, I no longer wonder how patch antenna work ;) Cheers

What is mean by filagate

are you drunk . i can't understand your words . please be clear

You're the man Pete

if (in air) L= lambda/2, then (according to the picture) W > lambda/2....then why do you take the gain of "short dipole", if it's longer than half wave dipole, and must add gain of 2-2.15 db. am i wrong?

WHAT part does the dielectric under the patch play? Is the 1/2 wavelength of the patch a
half Lambda under the patch (in the dielectric), or in air over the patch?

Good explanation, thank you. I assume the dB's should read dBi or did I miss something?

Thank you, very nicely explained.

You deserve a gold medal 🥇 for this video! On behalf of all Ghz rf engineers thank you!

how to calculate width of the input transmission line

so what components do I need ot build a mircostrip anntenna; as I thought an alterantive wave passed thrugh a cold of wire is what makes an antenna.


But thats justa magnetic wave; but is there a way to create a crystal atenna?

thx for such a powerful tutorial

I wonder whether this guy knows how good and talented he is at explaining complex stuff. I was shocked that I understood half of it...and I have no formal RF antenna training. Just a baseband analog and digital guy. Bravo for such an excellent tutorial !!!

Excellent explanation. Thank you very much.

I wish I could see your video before my last interviews!

thanks for your bravo explanation. I have no knowledge about antenna, but you make it simple and easy to understand.

Excellent and useful video

is the polarization direction useful?