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Calculate Antenna Efficiency

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Hi wesleyclone, Usually we go for efficiency ,once we know the s parametrs and there by the resonace of the antenna ,you know the frequency at which the efficiency is needed and regarding phi and theta ,you can opt for them or not .I guess its better to calculate the efficiency by defining the whole sphere.
You can only use S11 measurement. I think Balanis book has a nice and simple but still accurate way to calculate antenna efficiency through measurement. Assuming that your antenna is small enough (say biggest dimension not more than 10 cm or so) idea goes like this: In open space Q factor includes radiation, (...)
I'm not sure if my reply is applicable, or it may form another discussion, or I may infact be talking rubbish. But being a much practical person who uses simulation tools occasionally, I THINK I was told that some people would calculate efficiency using the: efficiency = (Gain of measured AUT / Gain of simulated AUT)*100% Do let me (...)
Hi All, How can I calculate the efficiency and gain of an patch antenna modeled in HFSS? Regards, -- Soyuz
hello everyone, anyone know how to calculate the efficiency in percent using cst? hope u all can help me. regards, kyg
As I have the practical value table of AUT gain ,Ref antenna gain, AUT maximum received power ,Ref antenna maximum received power (dB) and cable losses value, I am bit unsure about the theoretical formula to calculate the efficiency using Gain comparison would be highly appreciated if anyone could come forward to sort out my (...)
When I simulated a patch antenna with HFSS, the resulting antenna efficiency reached 1.15. It is an impossibile value in practice. Did anyone ever meet this problem? Who can tell me why this phenomenon appears, and how can I solve it? Thanks. :?:
Hi, is there anyone that knows how to get the antenna efficiency in CST? is it in the 1D result? but I cannot find it..... thanks in advance.
Hi, I have a question about how to plot the antenna efficiency against frequency in HFSS... I know that in the infinite far field folder I can get the antenna parameters for a specified frequency, but how I can plot the efficiency in a frequency range after doing the freq sweep? Any tips will be appreciated.
may anybody plz tell how to calculate antenna gain using hfss actually i want antenna gain vs freq curve
@vfone, thanks for the information. since total radiation efficiency is a multiplication of antenna efficiency and mismatch loss, with higher antenna efficiency, usually it can try to offset the minimal loss of S11 at -4dB ? how do we calculate based on the equation in terms of %? (...)
antenna efficiency is the ratio of the measured gain and calculated directivity. The directivity is usually calculated from the aperture size and wavelength. Gain measurement is best done on an open range; in aperture antennas the beam is often formed far away from the aperture; this is difficult to do (...)
Hi everybody I developed Adaptive noise cancellation system using Matlab and Vhdl both. I calculated SNR of original signal and denoised signal. Can any body tell me how to calculate system efficiency using these SNRs? Thany you an advance. Pl. I need it urgently
antenna efficiency in CST shows values like: 0.7869 and 1.2693. Do they mean 78.69% and 126.93% respectively? If so, can the antenna efficiency be more than 100%, without violating energy conservation?
How to calculate antenna gain if the frequency is 2.4GHz. I just have frequency only. I don't know transmit gain and received gain. Theoritically, how I calculate?
How can I do it? As sketched in previous post. Sweep a signal generator over the intended frequency range, measure input and radiated power, calculate the ratio for each frequency, plot the result. I have another question... Several misunderstandings of S-parameters seems to be involved. - S parameters can be app
I know how to mesure the gain,the pattern but how can i calculate or mesure the efficiency of an antenna? :( can somebody tell me? thanks!
currently i am involved in an antenna design using XFDTD. can easily get the patter and the return loss plots. the question is whether it is possible to obtain the TRP total radiated power in order to calculate the efficiency of the antenna. if XFDTD cannot, HFSS can or not? anybody is experienced in such topics can (...)
How we calculate the gain of antenna? high gain antenna is highy directional antenna? the gain of Yaggi antenna is zero?
:?: I have simulated an antenna and want to calculate its EIRP, Should i get it from the maximum E-filelds of 3D radiation pattern at diff frequencies, or from the E-filelds of certain direction? If latter, does it mean that the EIRP of antenna is directional? On the other hand, how can i get EIRP in measurement? from the pulse in time (...)
I've tried HFSS ver.10 and it's efficiency simulation is way off the measurement from chamber... any other candidates?:cry:
I've tried HFSS ver.10 and it's efficiency simulation is way off the measurement from chamber... any other candidates?
Hello everyone I am trying to plot the radiation efficiency of a patch antenna vs thickness of the substrate. I want to see the effect of dielectric loss, conductor loss and surface waves on the radiation efficiency. Does anyone know how to calculate surface waves for patch antenna with different (...)
Make sure that you know the orientation of your antenna and the preferred polarization of the radiated signal. Co and cross polarization is often referenced to this direction. If you want a detailed discussion of this subject run down a copy of: "Polarization in Electromagnetic Systems" - Warren L. Stutzman HFSS has efficiency calculatio
If i know the eirp of the spot in my location and i have the received power(dBuV) and c/n measured by the satellite meter how can i calculate the gain of the antenna? I`v searched by the net for over a week and all i can find are calculation indicated by ham operators (rf real transmision power antenna+transceiver or how to (...)
Hi, I need to calculate the Radiation Pattern of an antenna. I got S21 Mag and Ang data of the antenna from VNA by measuring the AUT with a standard horn. Now, how do I calculate the gain of antenna.What are the conversions of S21 Mag and Ang in dB. How to calculate the gain? Can someone (...)
Hello all, I am looking for a software to calculate grating diffraction efficiency. Does anyone know a good one (free would be great)? Thanks.
but is there any genral relation between them, like any mathematical formula ? No, as far as I know, there is no relation between Aeff and Aphys. Sometimes you see "aperture efficiency" Aperture efficiency = 100%*Aeff/Aphys. There are many antenna types. Within each type there is lots of variation (dep
I modeled a structure in MWS - parallel plate transmission line shorted from both ends. I contemplated using it as a radiator. I can match such structure to 50 Ohm but model shows low Radiating efficiency. How can this be if I use Perfect Electrical Conductor in Free Space? (I used to think that Radiating efficiency less then 1 is result of e
Hello There are a set of design equations for length and width of the patch Resonant Frequency=(3*10^8)/(2*Length*sqrt(epsilonr)) you should be able to calculate the length from here,in the above equation epsilonr represents the dielectric of the material. Thickness of copper affects your impedance values,so matching can be a issue.but
Im a beginner in desperate need for help. I am designing a slotted bow tie patch antenna with a back coaxial feed which I have already created in CST. When a transient simulation is run, I get a practically non existant efficiency. When looking at the surface current, it appears that very little current is flowing on the patch surface. Where am I g
Hi, I saw most of the IEEE papers on reflectarray design had included the value for aperture efficiency. How can we calculate the aperture efficiency of a reflectarray antenna? How much percent of aperture efficiency is consider good? Thanks.
Respected all, Help me figure out what should be the correct representation of antenna's efficiency. As per the parameters available in HFSS, one can plot the ratio of Radiated power to Accepted Power and another ratio of Radiated power to Incident Power. So, anyone please help me what is and should be the correct representation of (...)
One more question, how to check up the resonant frequency for each loop and spiral coil? I want to make sure they have the same resonant frequency. I see that you have the VNA on the desk. It is exactly what you need to find the resonant frequency of the coils. How did you calculate 80% efficiency of power transfer
why the reactance when antenna is matched supposed to be close to 0 or negative at imagenary part example: 50-j0.1 ohm? what happen if reactance is positive at imagenary part? thanks for concern thanks danesh
Hi, what about to use PML instead of radation BC. Pml are less sensitive to the angle of incidence and allow you to calculate antenna parametr Hope this help Rugby
why small microwave dish antenna mya have tapered Amplitude distributions while 30m dishes do not?
Hello, how to calculate antenna group delay. As I know the group delay is derivation of S21 phase (hence two antennas are necessary). But in HFSS it is possible to calculate group delay directly from simulation with single antenna, do HFSS include second antenna? If I measure group (...)
I consider the resisitor effect of coil, ESR, on resistor of swith, but my result is wrong, especially in low load condition. I think because of the resistor, the coil current behaves like an exponential way instead of linear way. Then I integrated the coil current and average the result to get the current from vin. Using eff=(Vout*Iload)/(Vin*Iin
Hello, everyone: Nowdays, I'm designing a small antenna that operates at the frequency of 398MHz,linear polarization and the gain is 0dBi. I have searched lots lots of papers relating to the aspect of compact antennas, in which I find that the C-patch antennas can satisfy the size requirement. I followed a paper which is in the attachment. (...)
Alright people, I have asked questions about P.A.T.C.H antenna desig before and gotten answers. This one is really urgent so please respond as soon as you can. The questions is I am looking for the effect of finite conductivity of copper on the design of a rectangular P.A.T.C.H antenna. So if anyone can guide me to those specific eqations that
Hello everyone, I've made a schematic-level test bench to estimate the converter's eficiency. I use a current source vdc to be the input of the conveter. And I just calculate the efficiency simply as (load current) / (the current through vdc). Is this way right? Thank you!
Hi everyone, Does anyone know how can I improve antenna efficiency of a printed antenna without change the structure nor metal and dielectric properties? In a simulation in fidelity(FDTD),I receive effieciency 46% and i want to meet the measured efficiency of 86%. Thanks
how to estimate to loading effect of antenna? and how to solve it? for example, a monopole was put in handheld application, but there were earpiece, LCD ... i found the input impedance of the monopole was incresed and resonant frequency was shifted. one more important discovery is that, my monopole was orginally 3X ohm, by putting a cond
When I calculate the efficiency, I find that I can get the highest efficiency under the condition that switching loss is equal to conduction loss. There is a problom that the high efficiency is correlative with load current. How much is the load current when the buck converter's efficiency is highest! Please (...)
Hi, I have a question, is it possible for the microstrip patch antenna operating at 60GHz? What is the upper frequency limit of the patch antenna? And which factors results for those limits? Thanks.
Hi All Is it possible to design a Bluetooth headset (2402 to 2480 MHz), where the antenna could be an printen inverted-F antenna and the plastic surrounding the PCB has been vacuum metallization (to give the headset metallic look) ? What I mean is: does the vaccum metallization degrade the antenna performance (ex in terms in lower (...)
Hi All Is it possible to design a Bluetooth headset (2402 to 2480 MHz), where the antenna could be an printen inverted-F antenna and the plastic surrounding the PCB has been vacuum metallization (to give the headset metallic look) ? What I mean is: does the vaccum metallization degrade the antenna performance (ex in terms in lower (...)
I've tried HFSS ver.10 and it's efficiency simulation is way off the measurement from chamber... any other candidates?:?:
Hi,everyone We usually can see on Paper some antenna the design is High gain and high directivity. But I do not understand the antenna Gain and directivity have any to be different. I knew these two relational type is G(Gain)=radiation efficiency*D(directivity). But I did not understand to this formula significance. The (...)