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224 Threads found on edaboard.com: Antenna Impedance Matching
Hi everyone, I have designed a dual-band microstrip patch antenna for LTE and WiFi application. The antenna operate at 2.6GHz for LTE and 5.0GHz for WiFi. I have started the design process by designing the 5.0GHz WiFi then introduce two inverted U slots to generate the second 2.6GHz. The impedance matching for the first (...)
Hello everyone, I have done the circuit design of GPS module. I have taken the U-blox NEO-M8U and GPS Internal active antenna JCN04N to design the GPS. I want to know how to do impedance matching with GPS module and antenna. Please somebody help me to solve this problem. Thanks, advance. 136635
Hi... I am new in antenna design I need help regarding impedance matching of transmission line in dual feed circularly polarised microstrip square patch antenna. Please send me design equations and document regarding this. Thanking You in advance....
hi everybody! i want to know how i can make the passive impedance matching of a monopole antenne between 50 MHz and 500 MHz thanks for replies
Hello evey body, Anybody can help me i'm a student and i'm new with hfss and patch arrays. i would like to Match 50 Ohm line to 50 ohms Patches in my feed network of 2*2 microstrip array but i can't how can i do it and how can i design the Feed network. if any body have a picture which include the impedance of each line sent it to. I try wit
hi, I am gonna design a quasi yogi antenna.and I wanna do something like this model.132842132842 but I really don't know how it design its Lcps. which is relative to its impedance. I know Lcps is kinda like matching. but how to know what number of impedance that can match between dipole and cps
Hi, I have acquired a small helix antenna for 433Mhz. According to its datasheet, it is matched to 50Ohms with a very good VSWR 1:2. Of course, it has been tested on a PCB with an specific groundplane and matching networks to achieve this VSWR, but there was not information about that. I have connect the small helix to my VNA and it it's not
Can you explain clearly about the "impedance matching"?
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?
Hello everyone! In my current project of designing a fractal patch antenna based on the Sierpinski gasket I'm not able to achieve a S11 parameter. I've tried using pin feed and λ/4 transformer (using Smith chart) but they don't seem to work. In theory the antenna's impedance should be matched perfectly, but in POSTFEKO the results are (...)
Hello, I have an UWB antenna that is composed of double sided substrate. I noticed that when i round the lower vertices of the upper side (patch) or the upper vertices of the lower side (ground) the matching improves, i reviewed the imaginary and real part of the input impedance and i found that they do get improve as the rounding (...)
The answer to your question: Why do we use a short circuit line to the ground plane? is: For proper impedance matching. IFA is a variant of ILA (Inverted L antenna) which has an L shape and don't use this short transmission line for "proper" impedance matching as IFA. ILA gets the right port (...)
3. what are the ways to increase the bandwidth? Increase antenna size. Electrical small antennas (< lambda/4) have a limited bandwidth by nature.
how can i better s parameter of my antenna? :( my s parameter is high around -1 , -0.6 , .....
Between two approaches for impedance matching (minimum reflection or maximum power tranfser) which of them can result in more gain in an antenna?
zin=0.05+j33.36 If the real input impedance of your antenna is actually 0.05 ohm, start with redesigning the antenna. matching this tiny radiation impedance is a helpless undertaking.
how can we know is there perfect impedance matching for our antenna which is designed in hfss?
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.
Consider -4dBi of a linear antenna Parallel requires impedance matching Pi then T filter C-R-C-R for 50 Ohms. Separate GPS antenna requires careful location and ground pad size. SIM908 datasheet.pdf
Hi erayarik, I've never used FEKO, but I don't see how solving the characteristic modes will help you impedance match your antenna. The eigenmode solution will tell you the frequency at which the patch resonates, and possibly the quality factor of the resonance. Neither of these is terribly useful for impedance matching -- (...)
You're apparently referring to the fact that your antenna is reflecting most of the transmiter power because is impedance is far-off from 50 ohm. Use an impedance matching network.
Trying to understand how the matching method is applied practically. You state to use no test equipment, also the antenna impedance will be unknown in the general case. The coax segment length is determined by trial and error (best S meter indication?). How about the capacitor value?
For a single frequency and ideal components can impedance matching be solved with aid of a Smithchart, a pen and some simple math:
Hello, i want to design a UHF RFID tag antenna, before i arrive to this step, I wanted to replicate the simulation presented in the attached paper, i used the same parameters as mentionned in the paper, but i didn't get the same results, i'm getting a low adaptation level and a resonant in a different frequency, i can't identify where is the pro
One should not change Z11, your problem in matching chip impedance to the input impedance of the Tag antenna.
If the S11 as seen by the port is low, the antenna is well-matched to the feed line.
hii every one, Pls tell me how to calculate the height and radius of probe,coax,coax pin and also give some information to perform impedance matching since solution data shows that input impedance is 50 and port impedance as 25. pls help me to solve this problem
Hello everyone... I have a problem in designing rectangular patch antenna with following specs: Resonant freq = 4.3 GHz Bandwidth = 100 MHz Radiation pattern = unidirectional VSWR = less than 2 Return loss = less than -10dB Gain = more than 10dB Feeding = coaxial probe Using the common formula, I got W= 27,578003mm and L=22,645751mm. Afte
Hi ankitbende, Admittedly I still don't understand what you're trying to achieve, but regardless, it seems like your issue is the impedance bandwidth of the patch antenna. Some form of matching can most likely be accomplished at the feed. Since you are using coaxial connectors, I would attempt to change the radius of the dielectric cutout (...)
how to find input impedance of patch antenna in ADS and how can i match it to 50ohm using microstrip line
HI, I have to match the antenna impedance(50ohm).from the source 80EV0301, through the pcb track. I had used the formula. 113326 in above image the width has calculated as 2.78mm is this value right?. i don't know how to calculate these values to match impedance. please guide me the steps to
When I measure antenna impedance with a striped coaxial cable (taken into account port extension) I get very different readings from measuring with a normal SMA connector. Why would they be different? They are both soldered to the same pad.
what kind of antenna u wanna simulate?
Measure TX impedance. measure antenna impedance, create a conjugate matching network. 1 km and free optical sight reliable connection can probably be done with any reasonable directive antenna. For 30 km is a well designed parabolic dish in both ends enough. At that distance must antenna (...)
I want to match impedance of waveport and microstrip line of UWB rectangular patch antenna which are mentioned in published papers of having two notch bands centered at 3.5 GHz and 5.5 GHz.Also kindly tell me how to set the dimension of waveport ? Kindly provide me simulated UWB antenna in HFSS with two notched bands.
An electrical small antenna over a sufficient large ground plane can theoretically achieve a gain of 4.8 dB, presumed it has no losses (perfect impedance matching, no internal loss). If the antenna radiates into both half spaces, the gain reduces to 1.8 dB.
Your question is missing many necessary informations: - what's the output impedance of the "impedance matching IC"? (Is it a ceramic chip balun?) - what's the actual antenna input terminal and designed impedance? - are there more PCB layers not shown in the screendump or just top and bottom? (...)
In default, the minimum on the S11 plot indicates the best matching point with respect to 50 ohms. Note that S11=20*log10|(Z-50)/(Z+50)|, so S11 is a function of both the imaginary part and the real part of the antenna impedance. On the other hand, the resonance freq determined according to imag(Z)=0 has nothing to do with real(Z). Therefore (...)
For proper differential application,balun in needed between your loop antenna and transmitter,of course the balun may be deleted only when your transmitter has diff.outputs. The SMD balun is good choice in our band, impedance matching may be needed.
It does not matter whether u treat your loop antenna as the source or the load with respect to the impedance matching task, though your loop antenna looks more like the source since it is used as the receiving antenna.
Water is a lossy medium, so a good S11 number isn't necessarily related to efficient antenna operation. Of course, you should still try to match the transmitter to a given antenna impedance.
I realize it's hard to answer my prior question without more intimate knowledge about my experiment, so I'll ask another questions....can someone please comment on the accuracy of HFSS's input impedance results? I ask because I was trying to design a dual band high impedance antenna, and HFSS showed great results howe
C11, L1 impedance matching antenna C8 DC decoupling C16 DC decoupling L3 impedance matching or stability
Design areactive L network in order to provide impedance matching between transmission line of Zo = 300 + j60 and an antenna having impedance of 80 +j100 at the frequency of 1MHz. How do design this circuit? My professor told me that while designing L impedance matching circuit we need to (...)
Seems relative correct done but when calculating a matching component should antenna S11 measurement be done at the place for the matching component due to the electrical delay. Else will electrical delay be wrong. If it is hard to solder measurement cable at component location, is it still possible to measure correct, by doing in place (...)
One or two antennas connected at the same time will alter impedance seen by transceiver and impedance seen by internal antenna. matching network or coax cable will act as stub-matching for the other antenna. A common way is to integrate a switch in CON2, switching to (...)
Hello everyone Can anyone please help me designing a balun/transformer to match a receiver loop impedance of 4ohms to a value of 50ohms (coaxial cable). I have designed a multi-turn antenna. It is working in the range of 3-30khz. Please help.:?:
antenna impedance varies too much with frequency , therefore matching circuit cannot match these impedances. You should use multiple stage ( for wideband) impedance matching circuit.
Before thinking to a dual-band matching network have to make the antenna to resonate at both desire frequencies. If the antenna resonate well at both frequencies, in most cases provides good VSWR (or S11) at those frequencies, and making easier the design the matching network. Sometimes don't even need a (...)
Irrespective of HFSS, I leave the port impedance on 50 Ohm and use post processing to calculate the reflection coefficient between the chip and the antenna according the formula you have mentioned. When using a renormalization to a complex impedance, some programs have a different behaviour thus I avoid these functions.