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Very concise explanation. What a great video, thank you a lot. from an undergrad studying finals

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Hello Kathryn I would like to ask if it would be feasible and at all beneficial to have multiple Yagi antennas all equally tuned and at the same hight but in a circular array. For example having six Yagi antennas forming a star pattern so as to push the +dB signal out in more of a wabbley circular pattern (Non collinear). Thank you kindly for sharing your knowledge

This is FANTASTIC !

Thanks!!!

In my understanding T=(Zo-Zin)/(Zo+Zin) Or am I wrong?

You are so smart ... My wish to love you

Tq❤

Perfect

Beautifully developed concept of the Lorenz gauge especially. I'm surprised you so readily dismissed the vector potential as a purely mathematical artifact rather than as something pertaining to a physical reality. There is an argument for the reality of the vector potential based on quantum phenomena such as the Aharonov-Bohm effect. Although he termed it as the electro-tonic function (i.e. Faraday's electro-tonic state), Maxwell was clearly convinced of its physical significance with respect to electromagnetic induction. He seemed to prefer its relevance in that situation over the commonly agreed causal relationship between flux linking and electromagnetic induction.

Superb ❤

She is good !

thank you

Wow 😍amazingly explained Thank you

Greetings! I am an engineering manager at a major company running an RF group. My company is paying for me to do my second master's degree at Johns Hopkins online (I am on the west coast). I will be 60 in 2025 but do not want to stop learning. That said, I am taking a course at JHU in computational electromagnetics and on my final project we are implementing a simple telegrapher's equation in finite difference. This does not mean it's easy. PS: My first master's degree is in music - organ performance and sacred music from the Jacobs School of Music at Indiana University Bloomington. Thank you for these helpful videos!

Now it makes sense when you brought up Helmholtz theorem.... Thanks

Very nice 👍😊 I am from India nice clerifa tions

All of your videos are excellent. I don't know if you are listening still to replies, and I hate to impose if you are, but a fascinating question I have been trying to answer is that the length to diameter of a dipole antenna determines its bandwidth, and adding d with a fixed l increases the bandwidth while decreasing its resonant frequency. Do you know why this is? I have done many searches and found nothing, except that increasing d reduces the inductance, which contradicts the lowering of the resonant frequency, unless fringe fields counteract the reduction in inductance. Thank you, whether you see this or not. Edited to add: I found the answer in ARRL Handbook on page 20.3. “If the diameter of the conductor is increased, the capacitance per unit length increases and the inductance per unit length decreases. Since the radiation resistance is affected relatively little, the decreased L/C ratio causes the Q of the antenna to decrease so that the resonance curve becomes less sharp with change in frequency. This effect is greater as the diameter is increased, and is a property of some importance at the very high frequencies where the wavelength is small.”

best!

THANK YOU!

patch antenna was my final year project in 2010 at Houari Boumedien University in Algeria (Modeling of a patch antenna network using the iterative method)

Good 👍

Good 👍

Extremely oraganised and simple. Straight to the point. Thanks for posting

Thank you.

thank you

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Great video! I have one question: Since we matched Z0 and Zin, what about Z1 and Zload? I mean we secured no reflections at the beginning of the quarter wave transformer but did we secure no reflections between the quarter wave transformer and the antenna?

huh

2:19 - H field should be pointing either in +x or -x direction, right? (+ or - x directions are not defined in the shown example, that's why I am saying +x or -x, depending on the right-handed rule) So equation should be with a hat x and a hat x.

Hi, I would like to ask why do we bother to create the concept of A which in the end is a formula related to the current and then we take the curl of it to get B, when we can use Ampere's Law which is the curl of B = mu0*J in statics and vacuum? If we want the vector B, can't we just use integration on the curl of B instead of doing the Magnetic Vector Potential approach?

please what is the radius of the second circle you draw to to have the intersection

Hi professor, thank u. But I have a question. Why didn't you consider dD/dt for ampere's law

wow, that's so useful, love it

Hey there, does ZL means the Impedance or the Admittance? Thanks.

Thank you so much!!!! I admire you and your lecture

wow these lectures are insanely good

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I would move to the awful state of NC to continue with my Ph.D. if I could learn from her! Throughout my entire BSEE and MSEE curriculums and 6 years in the RF Engineering industry, never have I ever met anyone who could explain these topics as clearly as she does. If these playlists existed back when I first began my graduate coursework with an emphasis in applied EM and antenna theory and design, I’d of progressed significantly faster. If you’re studying RF/Microwave Engineering and you’re NOT watching her videos, you’re either unaware they exist, or a glutton for punishment doomed to exist in complex exponential HELL as a means to make sense of antenna design through abstract mathematics (as is the conventional method) given what I believe to be a lack of professors with her level of comprehension in academia.

this was really helpful, thanks

Thank you very much.

Thanks a lot Doc

❤

Well in the Poisson equation for A we have a scalar on the left by definition,but a vector of J on the right,how come?

The animation on 1:14 is very confusing. When I point the thumb of my right hand in the direction of the X-axis (arrow, top left of the monitor), my right-hand fingers do not curl in the direction of rotation as shown. They curl in the clockwise direction and not the anti-clockwise direction.

Thank you so much!! Thanks to you I finally understand this material :)

If you wanna understand the imaginary numbers, the complex plane and the Euler's formula, read the book "Engineering mathematics" by Steinmetz where he brilliantly explains all this stuff from the ground up

High quality content. Thanks!

0:57,Hr is having gamma in power , how(gamma with k)?

can you please clarify the expansion in 0:22 . in Hr term ' - ' was missing and also e^+jkr. Please help me out