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Folded Dipole Antenna

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44 Threads found on Folded Dipole Antenna
Thanks for your replay, in fact new antennas arrive with balun on it, this antenna is home made, is not original, also im going to use 50 ohm wire from antenna to my tv. Thank you. so ... is it a folded dipole or a straight dipole ? As Brad said, 300 Ohms was standard and that was for a (...)
It is a kind of asymmetric dipole with folded arms. I think not even the designer of this antenna doesn't know exactly what it is. He just cut and paste in the simulator to get the best performances in specified bands. The net, the antenna books, and the RF magazines, are full of examples of crazy shapes of printed (...)
Dear all I have to design folded dipole antenna in ADS, can any one provide ma dipole antenna designing manual/tutorial???
I have antenna electrode, in a shape of planar resonant loop or call it folded dipole, which I need to broadband. I try cutting it along the length and make it into two electrodes side-by-side, inner loop and outer loop. I was hoping because one electrode will be longer then another and it?s resonant frequency will be slightly higher, I will (...)
i desgin folded dipole for FM band using cable RG11 which is 75 ohms is no problem SWR is less than 2 but i trying to bulding with 50 ohms cable which i got SWR greater than 2.5 if any one have ideas how to improve it thxs just a big hint ... .you should be using 75 OHm feed on 88 - 108 FM band anyway ... so
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 believe the HFSS antenna Design Kit (ADK) can be extended by adding your own code, but does anyone have any instructions on how to do this? For example, lets assume I want to be able to design a folded dipole to have a specific impedance. One can achieve this by having the two sides of the dipole of a different diameter, (...)
hye all, as title above...i would like to know if anyone have idea on how to feed the folded antenna for this design in HFSS, actually this was taken in one of journal and it was used for my study purpose. here the
hi all! can anyone tell me about TE and TM modes in antenna. i am designing a patch antenna in hfss 11. how these modes are related to antenna radiation or resonant frequency .i dont know anything about it. plz help thanx
Deborah, Please see attached file. This was a Yagi-Uda antenna array I put together for optimization but never got around to it. The Yagi_uda is driven by a folded dipole antenna which was optimized in its own design in the file for the given frequency. Have Fun
I'm trying to match a folded dipole to 50 Ohms using a 4:1 balun. The problem is a folded dipole is not exactly 200 Ohms, so a 4:1 balun does not result in a very good return loss. I believe there may be some trick that can be played by having the length of the balun a bit less than lambda/2, to compensate for the fact (...)
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.
I can make an antenna at any length and with low VSWR as long as required efficiency is in parity with antenna length relative to lambda. Not too long ago did I make a bottom feed folded dipole with total length lambda/8 and bandwidth in similar range, 60% efficiency, but that was for 2.4GHz At antenna (...)
Hi, I have designed a folded dipole antenna 200 GHz. I have increased the number of turn and checked the S11 parameter and expecting a narrow bandwidth. But I am not getting expected result. However, Impedance curve seems ok. Can anyone tell me please which parameter contributing to this problem and how ca I solve this provlem? Thanks (...)
Hi Everybody, I need an example project or tutorial about designing a pcb antenna in HFSS. Regards
Generally the length of the folded dipole should be 5% shorter than the half wavelength as shown in the figure (which I attached earlier). The are as such no requirements for the gap. When I made a folded dipole antenna, I adjusted the length and gap using the Network Analyzer. (Magnitude of S11 should (...)
Hello everyone, I'm a bit stumped when using FEKO. I'd like to obtain the input impedance of an antenna, which I estimate to be approximatley 200-300 ohms (folded dipole). In POSTFEKO, there is an option to "subtract loading" above the reference impedance. As far as I can tell, this needs to be checked in order to obtain the correct (...)
You will discover that it is relatively low compared to a dipole. This is why it is frequently the case that a folded dipole driven element is used to 4x the impedance.
Hello, The impedance of a folded dipole is about 4 times the value of a half wave dipole. This is not valid for a full wave loop. Given 1A feed current, a half wave dipole generates a far field. The strength depends on the orientation of the observing point to the dipole (donut shaped radiation (...)
I'm simulating a multiple fold dipole antenna for 200 GHz (lamda_g = 597.2 um). The antenna is folded 4 times (has 5 poles) for very high impedance. The antenna width and arm spacing is 0.02*lamda_g. The feed gap is 24.5 um. So I made the wave-port 24.5 by (s + w) um. Is this acceptable? Or is a lumped port (...)
folded dipole and yagi
4:1 balun it will match 50 ohms to 200 ohms. The usual impedance of a folded dipole is somewhere between 200 and 300 ohms. In your simulation you get much smaller than this.
Hi lkjhgf, I deigned folded dipole many times before using ADS. Please check two things: 1) change the stting of the subrtate /////GND///// from closed to open with epsilon=1. Re-simulate and check the results. 2) How did you set the ports, can you attach a photo of that let me know about the results Mustafa [color
hello everyone anyone have any paper for folded dipole antenna please send to me i am need to study that paper to do my project. hope i can get that paper that relate for GSM BAND frequency 880 960mhz and 1710-2170mhz
I need this paper Multiband folded dipole antenna for mobile phone Ishimiya,K.Takada,J-I Dept.of Int.Dev.Eng.,Tokyo Inst of Technol this paper appears in:antenna Technology:Small and smart antennas metamaterials and Applications 2007.IWAT'07.International Workshop on Publication date :21-23March 2007 (...)
anyone know how to design folded dipole antenna with single feed the band frequency : 880-960MHz 1710-2170MHz any idea please help me
hello, I have some problems with my antenna (which is suppose to work as a folded dipole). I am simulating the same structure, firstly with pml boundary conditions. I have a certain resonat frequency and a certain gain. I am simualting the same structure, but with radiation boundaries. I get a different resonant frequency (1 MHz (...)
I have designed and built up a folded dipole antenna for 145MHz frequency.I have designed a 4:1 Balun for it also which is based on coaxial wire only. Now I want to test this dipole only,before I put it on yagi boom. Anyone please tell me what are steps involved in testing folded dipole on (...)
If your dipole is folded on a dielectric material without ground plane, you can use a lumped port placed inside the gap. It is like placing a voltage source inside the gap, with its positive terminal connected to one leg of the dipole and the negative one connected to the other leg. Your dipole must be enclosed into an (...)
Dear Friends, I'm trying to simulate 3- element Yagi antenna with hfss. I'm using folded dipole as the driver element (input imp 200Ω). for that i'm facing two problems 1. how shall i define excitation at the gap of folded dipole ? or is it better to use balun and simulate? 2. reflector and (...)
Hi, All: 1. I noticed a paper using IE3D for the design of Kock Monopole: G. Tsachtrsiris C. Soras, etc. "A Printed folded Kock Monopole antenna for Wireless Devices", Microwave and Optical Technology Letters, Vol 40, No. 5, March 5, 2004. Please check it. 2. Regarding generating the model of the structure from Matlab or other general
Dear friends Can anyone of you make a comparison of LOOPS Vs folded dipole Vs Simple dipole Vs Yagi's in terms of directivity , Gain , Bandwidth and what if Phased array are fromed of above mentioned elements. I need application wise comparison that where to use which type more suitable? Plz its a request that
I have seen an phased array composed of folded dipoles in a paper in IEEE transaction.
is posible an array of loop or folded antennas. in ARRL handbook are same examples.
Hi everyone, would anyone tell me why we have VSWR variation if we change length of a folded dipole antenna... if u have any useful paper regarding this issue, i'll be very thankful thanks in advance
hi, can you please recommend good readings or articles that may help me design a slotted folded dipole antenna or any suggestions thanks
hi, my design is to match a folded dipole to a chipcon-based differential RF ports (86.5+j43) since the radiation resistance of a folded dipole is about 300 ohms, then i need to match this to a differential line of 86.5. my question is: is it possible for me to use a coplanar line designed with an (...)
I am using cst at work during my lunch hour to model a folded dipole antenna, and have a weird problem which I cannot see. On a folded dipole I created a discrete port, but when I run the transient solver, I get the following error. "The discrete port is inside a perfect conducting solid". I have (...)
Hi: I think one more reason people use folded dipole is for matching. A typical dipole antenna with normal radius has a Z = R + j X = 75 ohms at the resoance defined as jX = 0. A folded dipole's impedance will be about 4 times as big. It is close to 300 ohms and that is why many old TV (...)
Please find the radiation pattern of folded monopole in attachment.
This antenna is of the family type called "folded dipole" and the two parallel wire portion performs an impedance transforming function. If the wires are of equal diameter the transforming ratio is 4 times which makes the feed impedance 300 ohms. For the monopole over a ground plane the impedance is 150 ohms. To keep the unwanted loop (...)
To simulate LPDA, this is same with yagi antenna (non folded), But all element is driven and is connected by transmission link with cross link connection. The transmission line have impedance can build with two parallel boom. LPDA Book can load in
Hello! There exists many antennas that differs in their radiating resistance. But can we say that a 50 ohms p@tch antenna is less sensitive to e.g. the hand than a 300 ohms folded dipole antenna? To enlarge the issue, what antenna characteristic (-10dB bandwidth, environment (...)
Hi jsp, r u talking abt a folded dipole? Cheers, Element7k i have some question about the dipole antenna design suppose u have tx output 50ohm and matching 50 to 300 at that point two lamda/4 line then what should be the imp of the elements of just for electrical length it should be quarter wave thanks in (...)