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32 Threads found on edaboard.com: Wideband Balun
To feed a wideband antenna like this you need a wideband coupling structure (balun) from the feed line. I suspect that your microstrip line, due to the dielectric substrate, has a slower wave propagation velocity than that of the log-per radiating structure. Try to use air line for the microstrip, this may work.
Because this is pretty wide band design I think the PA use a wideband toroid transformer balun (and not a microstrip or TL one), and this balun doesn't work on wavelength theory. In this case the output impedance of the PA should be pretty constant vs frequency. If is not constant and if it varies with frequency, the only way to solve the (...)
It's a 1:1 balun Transformer that is used to convert Balanced-to-Unbalanced ( or vice versa) has no effect on impedances. But amplitude and phase unbalance specs. are very poor due to its' wideband characteristics.Irecommend you to use a narrowband one which is more convenient at the frequency where you would at. Because if you us
Guys, anybody could advise a commercial SMA balun for 2.4GHz measurements? I've been checking minicircuits, but they have for 500MHz only... Or am I better to create a simlpe coaxial balun myself? No wideband needed, just for a measurement of some 2.4Gig diff amplifier. What is your experience abo
A wideband balun can be only implemented by a transformer, either transmission line or conventional type. The original question is however very vague, talking about "1 nH" balun (transformer with 1 nH inductance?) without telling a frequency range. 1 nH inductance will be too low even for GHz frequencies without a resonant circuit.
A RF balun can be made resonant but best baluns are wideband.
Hi guys I'm working in a integrated feeding system for a type of spiral antenna my antenna work very well , I have a return loss better than -10dB in 2-12 GHz my balun work very well too but when I connect them together my results are so bad and I dont have a wide band Can anyone help me ?
this results is not good for me , because I must obtain a wideband antenna with balun I try a lot ,but they are not good :( I dont know , why ?!
Thank you. it very helpful for me. now i designing for wideband mixer. so normally for fixed band, if wanna plot graph for conversion gain versus RF frequency we just vary RF freq and fixed LO freq. For my case i wanna check the stability level of conversion gain along the wideband range. Its mean that i need to vary RF freq in between the (...)
In datasheet the input and output ports are explicitly marked. So I don't think I can use it in a reverse way. baluns are reciprocal passive devices and can be always reversed. Also see the 5320 model. Unfortunately it involves a resistive -6dB power splitter. 1:1 wideband baluns with up to 3 GHz frequency range
I found a paper on designing a wideband balun. The paper is "A 6 to 20 GHz Planar balun using a wilkinson divider and lange couplers", by J. Rogers, R. Bhatia. I am not sure, this is what you are asking? -sv
Hi - following question: What kind of UWB Antenna is proposed for a Transceiver operating with 7GHz, sending out / receiving bursts with a 1ns window. And - I have a differential LNA input. Matching I think is only possible for narrow but not wideband operation.. so do I have to match the LNA to 50Ohm or not? Also the balun is only f
Hi everyone, I am dealing with a wideband balun covering from 3G~7GHz, to feed the LO of a SRD Mixer. I made the balun model according to some documents in HFSS environment. However, I was not able to add the balanced ports, and I added two waveports for them. And I get terrible results for the single balun. Anyone would (...)
A few things, you can find some very useful information at the following document: also search for guanella transformer or current balun. if you want ultimate bandwidth search for Minerva Duncan paper on wideband balun. J. W. Duncan and V. P. Minerva,. "100:1 Bandwidth balun Transformer"
is there any balun available in the market that can operate in the frequency range of 400 mhz-1000mhz
Hello, I am trying to simulate an unit cell of an UHF Arrays using HFSS with reference to: IEEE Transactions on Antennas and Propagation, Vol 54, No.7, July 2006 -Compact Light Weight UHF Arrays Using Long Slot Apertures I've drawn out the structure of the unit cell except for the balun transformer. The requirement is a wideband 4:1 (150-60
Unfortunately the microstrip baluns are narrowband, and cannot be used for the frequency range you mentioned. Below is an example of a wideband balun, but having less BW you specified.
Hello, You should be able to design in Multilayered Broadside CPW Coupled-Line balun for wideband (using AWR MWO)... See the attached paper... ---manju---
@FvM ... what diff amplifiers do you use and where do you get them? @eecs4ever ... datasheet of you ADC usually suggest a wideband transformer, if not, choose one from Mini Circuits. Watch out for the correct impedance transformation and termination.
Hi everyone, I have a question about how to simulate a balun in HFSS. If I want to know the amplitude and phase characters between the balun's two output arms,such as the wideband Chybeshev transformer, as the fig.How to model and solve it in HFSS? Thanks and Regards! CaoCao
Try seaching in MA/COM. They have some wideband high power MOSFETs.
What type of discrete mixer is suited for wideband mixing. I thought about a diode ring or a MOS switch. I dont have access to integrated mixers like Mini circuits and similar. I read about the performance of the single and double balanced modulator and built a double balanced mixer. The main problem was the transformer was not perfectly simetric
I don?t know how good is the current distribution from unbalanced to balanced using a wire fed port, but I know that using a balun the current distribution is almost perfect. Here are a few examples how to feed a microstrip dipole using baluns
I searched many papers ,and i found it is difficult to compute characteristic impedance of planar asymmetric lines which is air between them, it is very complex to construct exponential model, I cannot upload it here, can sombody help me? thx in advance!!!!
I find the resistive min loss pad is very boradband and the loss is very predictable. However, that won't get you from single ended to diff. For that you may need a wideband balun transformed (Toko, MACOM, etc). I use the balun at 50 ohms and then do a 50:75 ohm differential min loss pad. This has worked the best for me up to 2 GHz.
Hello Everyone! I'm working on wideband baluns, and I'm trying to activate them. Does anyone have any infromation on active wideband baluns? Everything is welcome. Thanks A lot!!
one of the best and simplest balun from coaxial line to tem line is describe in this article: "a wideband balun from coaxial line to tem line" by P.R.Foster and Soe.Min.Tun
hi, i want to design the balun for wideband,but i dont how to design the balun i refrence the book mass writted but i simulate the balun ,the result is not good, can you tell me u how to design the balun
i want to design the wideband(2-18 GHz) double balance mixer,first i have designed the tapped balun,but it have some trouble question,in the low-band and up-band S(2,1)and S(3,1) are far away 3dB,who can tell me how i slove the problem! follow the picture!
To realize a balun transformer within a very wideband frequency range, it should be noted that simple classic L-C baluns can not cover this frequency band. There are two ways to realize it. 1-Using a transformer which has tight coupling coefficient and one of the output pins is grounded. In this way a well designed transformer will (...)
here is one paper as a reference. the bandwidth is not wide, but you can expand easily. M. Basraui and S.N. Prasad "wideband, planar, log-periodic balun." 1998 MTT-S International Microwave Symposium Digest 98.2 (1998 Vol. II ): 785-788
Hi Agknayak, Please read about this topic in an earlier thread on this forum: where you can find url references too that hopefully still valid. I do not know of a specific software focusing on the design of wideband RF impedance matching transformers, unfortunately. You can