The Yagi-Uda Antenna - Lesson 3

This video lesson introduces the Yagi-Uda antenna, which consists of a single driven dipole antenna operated within an array of other non-driven, linear elements known as “reflectors” and “directors.” The function of the reflectors and directors is to help focus the typically rotationally symmetric radiation of a dipole antenna in a single direction. Yagi-Uda antennas are narrowband but offer very high directivity with linear polarization. This course was created for Ansys Innovation Courses by Dr. Kathryn Leigh Smith, assistant professor, UNC-Charlotte, in partnership with Ansys.

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[lerneninverschiedenenforme]

Highly underrated material! Thank you very much for the work!

[waylonk]

Thanks for posting this on YouTube. The visuals are the best I've seen so far when learning about this antenna design.

[TheMuffinMan-m]

Thank you for visualizing it like that. Very helpful.

[Earth-Worm-Tim]

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.

[glenmartin]

Thanks. That was a pithy, concise review. Keep the videos coming.

[JulietNovember]

Great explanation. It was voodoo to me before!

[johngranato]

Great explanation, young lady. Thanks a Million!

[Javierriveraab]

Thank you very much for the explanation, professor!!

[CaseyStanton]

This is so easy to understand. Great job!

[kcoRwobniaR]

Thanks ! Great material to begin with.

[nwadeswim]

Thanks so much! This material is fantastic!

[garylanders]

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

[tomstrum]

Thx for the video...What Causes the Inductive Reactive element (the Longest element) to Reflect rf energy back towards the Driven Dipole element ? Also, what causes the Capacitive Reactive (cascading Shortest) elements to steer rf energy Foward away From the Driven Dipole element ?? Why are Parasitic Elements specifically 5% Different in Length and Why are Parasitic element Spacings usually Near a 1/4 wavelength Boom Spacing ? How were long multi element Yagis designed Before computer models ?

[wesKEVQJ]

Thank you for the very informative video.

[lawrencecohen]

Excellent description and visuals of the Yagi antenna.

[trainmaster]

I never can get a reflector to work with the antenna I have built....no matter the spacing. The signal level always drops with a reflector.

[compuguy]

What if you have a vertical and horizontal element 90 degrees from each other?

[jeffreycanipe]

I just found this author and i really enjoy the lessons. Being a ham radio operator, i am very interested in building a 70 cm (approx: 443 MHz) yagi. Thank you.

[ireadursoul]

what happen when yagi has a reflector - driven and no director?

[JaraFPV]

What will happen if the reflector and directors are not aligned in the center?

Say the directors are all aligned at the bottom instead of them having on the center of the reflector?