Thanks Nipun for explaining not only how and why this works, but a fundemental understanding of the of the design . It bothered me that majority of the other TH-cam videos I've watched on antennas don't explain this. I like to understand the design in order to adapt it to my specific needs. Now I see the antennas in term of the ratios & constants Thank I've learned from your video!
Very good presentation. I would like to know how you determine a K value for an initial design. My interest would be designing an LP antenna which would cover 10 and 12 meters. Thank you for sharing.
That shall be most likely calculated by considering the biggest element and reducing the length 25 percent and seeing if the smallest antenna length vanishes before achieving the desired total length.
Good, methodical explanation... We can find length l1 from calculating lambda/2 from the highest frequency of the antenna's bandwidth. I am left wondering, though, how do you calculate the first spacing S1 between elements one and two? (Subsequent spacings were explained.)
www.electronics-notes.com/articles/antennas-propagation/log-periodic-lpda-antenna/theory-equations-formulas.php This site has really good details on LPDA calculation of every element Give it a read, I will try to paste the article here if I could
Hello, Absolutely Larger bandwidths are pretty resource consuming in terms of input power however the input Power is not the only deterministic factor for signal strength :) A well matched, properly designed and polarized antenna could show better performance for lesser input power.
@@nipunharitash greetings from the small island of Malta.... so if you want to design an LPDA from 100 to 400 mhz....the tallest should be around 1.5m and the shortest 0.35m. At 100mhz you wont have a reflector behind ,so how will this work at 100mhz? thanks for the great work youre doing.
Do you, or any commenter here, have a link to a cell phone antenna using this type of array? Build at home, of course.🙂 Yagi don't seem to be so great for the frequency range variation of modern phones
Thanks Nipun for explaining not only how and why this works, but a fundemental
understanding of the of the design . It bothered me that majority of the other TH-cam videos I've watched on antennas don't explain this. I like to understand the design in order to adapt it to my specific needs. Now I see the antennas in term of the ratios & constants Thank I've learned from your video!
Sedrick Hyacinthe Thank you for your kind words. It encourages me to make more good stuff :)
thanks very informative and helpful .
Very good presentation. I would like to know how you determine a K value for an initial design. My interest would be designing an LP antenna which would cover 10 and 12 meters. Thank you for sharing.
That shall be most likely calculated by considering the biggest element and reducing the length 25 percent and seeing if the smallest antenna length vanishes before achieving the desired total length.
Nipun, I wish to thank you for this video. I have the same question as Bruce. How do you determine the values for K and S.
Thank you .. means a lot :)
What is the minimum and maximum frequency best used for log periodic antenna?
Good, methodical explanation... We can find length l1 from calculating lambda/2 from the highest frequency of the antenna's bandwidth. I am left wondering, though, how do you calculate the first spacing S1 between elements one and two? (Subsequent spacings were explained.)
Thanks for appreciating, I'll get back to this soon, I am travelling :)
www.electronics-notes.com/articles/antennas-propagation/log-periodic-lpda-antenna/theory-equations-formulas.php
This site has really good details on LPDA calculation of every element
Give it a read, I will try to paste the article here if I could
Great explanation. So in offering such a large bandwidth...is the signal strength less for a given input power?
Hello, Absolutely Larger bandwidths are pretty resource consuming in terms of input power however the input Power is not the only deterministic factor for signal strength :) A well matched, properly designed and polarized antenna could show better performance for lesser input power.
The bandwidth of the LP antenna is determined by the length of the first dipole and the last?...thank you
Yes, correct
@@nipunharitash greetings from the small island of Malta.... so if you want to design an LPDA from 100 to 400 mhz....the tallest should be around 1.5m and the shortest 0.35m. At 100mhz you wont have a reflector behind ,so how will this work at 100mhz?
thanks for the great work youre doing.
So how does this show how to make an LPDA antenna
Do you, or any commenter here, have a link to a cell phone antenna using this type of array? Build at home, of course.🙂 Yagi don't seem to be so great for the frequency range variation of modern phones
You are right about this.