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Impedance Matching Dipole

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23 Threads found on edaboard.com: Impedance Matching Dipole
Hi all, Please, How can I use Lumped element on a port for impedance matching purpose between a discrete port and dipole antenna in CST? How can I connected the Lumped element, discrete port and antenna together ? what I use to connected them?
Without looking at your design, I'd have to say that it's expected. Commercial Yagi antennas typically have some kind of matching network (Gamma, Delta, etc.) to tune the antenna impedance to near 50/75 ohms.
................... P.S my dipole is precisely 50 OHM and so is the coaxial cable so no need for impedance transformation. I only need to eliminate the coax shield currents. How did you achieve that ? ... dipoles are 75 Ohms by nature ( folded ones 300 Ohms) ... what impedance matching did you do ? Dave
You can get a formula for the complex impedance of the antenna from Wikipedia under "Short dipole" on the "dipole Antenna" entry. and there is a section on "General impedance can use a calculator on it. You will be looking to
he he he...11 dB is about all you are going to get unless you want to trim the antenna a little shorter and add some impedance matching elements. You should be happy with that. A ferrite ring around the coax cable right at the board would probably help a little too.
You're sure the ground plane is λ/4 away from the dipole? There's a great tutorial in Balanis on dipole arrays and impedance matching.
Dear all, I have a question about matching a printed folded dipole. I am working at 2.45GHz My antenna is connected to a 50 ohms /50 ohms balun, then connected to a 2-ports VNA, for s11 evaluation. At the frequency of interest, the impedance is Z; is this the impedance of the antenna seen from the VNA? Because I need (...)
I am trying to impedance match a 5-element dipole array in HFSS using the Active Z re and im values, but I am not getting good S11 with it. How do you achieve good impedance matching of array elements? Please help all you HFSS experts out there.
Because the log periodic use a bunch of parallel dipoles, its impedance is actually lower than of a λ/2 dipole (which is about 73 ohms)
Folded dipoles with equal diameter wires in both parallel lines increase the impedance by 4x. This will increase the lowered impedance (caused by the parasitic elements) to be more nearly equal to 50 ohms and make the impedance matching to the coax easier.
A standard method (but narrowband) is to add a length o 50 ohm transmission line to rotate your complex impedance so that the imaginary part goes to zero. At that point, read the real impedance and use your quarterwave transformer to match that.
Hello All, In an attachment to this message, dipole antenna model is attached. can any body have suggestions, how to improve s21, s12 parameters without changing distance between dipole antenna.impedance matching is almost perfect.
1. Yes, the impedance changes with frequency. And some formulas for antenna impedance you can find only at their resonant frequencies. For example a dipole antenna: 73 + 43j at its resonant frequency. At other frequencies, the derivation is complicated and requires lots of tedious steps, therefore usually we measure the (...)
Probably is about a small printed dipole, and you can use a gamma match, which allow tuning the impedance match of the antenna.
I would like to assign 1000 ohms to a feed line in HFSS? How do I do that? Also, how long and wide should the rectangle be? I am building a quarter wave transformer for a dipole antenna to impedance match it. I am using a lumped port to excite it, but my advisor wants me to build a matching network with a quarter wave transformer with (...)
Check the impedance nature of monopole antenna around 915MHz. If you find that it is not matched to 50 ohm then based on the bandwidth you may match with simple L and or C or L section or PI section etc. Smith chart can help you.
This is kind of module manufactured on a boat. There is no specification on the datasheet for RX-TX antenna impedance. Give a try without matching components and luckily it will work for the distance you are looking for.
So, I am building a high powered FM transmitter for out in the ocean. I found a complete FM transmitter on a
i have simulated the dipole antenna with different lengths and when i find the input impedance i find that i have some positive values for reactance and some negative values why i got these answers and how does reactance effect on performance of antenna
Hi, I am new to HFSS. I am doing matching filter network to balance dipole antenna. I know ADS but new HFSS. Top=Air Copper: 17um Substrate:RT-Duroid 5880 Ground: No Bottom=Air Is anyone know how to assign an excitation differential port with Complex impedance to Coplanar Stripline which is <1mm next to each other? Complex (...)