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113 Threads found on Antenna Gain Directivity
Hello , the Sinuous antenna that i have built is dual polarized because it hase two orthogonal dipole feed,i have attached the diagram and farfield results of the simulation. this antena is dually polarized, i have used ludwig 3 on vertical /horizontal as shown in the attached photos. how can i interpret the ludwig 3 diagram and get the direct
Hello, I am trying to design dual band microstrip patch antenna but I calculate very low directivity, gain values. I am trying to solve this for few days but I couldn't. Could you please help me? Thanks... 133090
exactly the opposite : high gain small beamwidth and viceversa. The bigger is the antenna the bigger is the gain
You can do a relative directivity, where all the gain points are related to a maximum gain point. For example if you get an antenna gain pattern from 0 deg to 360 deg (step by 15 deg), and you get a maximum antenna gain at 30 deg, consider that gain point (...)
Hi All, Am very new to microstrip patch antenna design.Have to design the patch antenna resonating at 2.45 GHz for Bio-Medical applications using ADS software. Could you please help me out to identify the coverage area of the patch antenna
Hi What is difference between radiation gain and antenna gain? Thanks alot
hi, E field is electrical field and H field is magnetic field. i would say most relevant gain and efficiency. from gain you got to know directivity and polarization of an antenna. from efficiency you know how much radiated power over input power for an antenna. E field plus H field with other parameters (...)
I had simulated micro patch antenna for 2.4 ghz and I can find s11 but please explain procedures to find other results like far feild radiation, near feild,efficiency,gain,directivity and all parameters
Best e-book is the Google. By array-antenna, are you looking to build a Phased Array? Or just using multiple arrays to increase directivity and gain? I would've gone for Helical however...
To add to previous post... the omnidirectional horizontal path and the dead spot on vertical, yields a meagre gain of only 2dBi . 0dB isotropic or 0 dBi is for a theoretical spherical antenna. This "rubber ducky" choice trades sensitivity with directional pattern or "directivity gain" It does not control the transmit (...)
Do you know why the gain would be negative? What is the directivity of the antenna? Do you know the relationship between the two?
Hello Everyone I am simulating an antenna at 193.5 THz frequency range (150-250 THz). The design is a simple Dielectric Resonator fed by a microstrip line. I am facing two problems: 1) I am getting the value of gain to be more than directivity, i.e. My directivity = 12.47 and gain =13.18 as shown in (...)
obtained negative antenna gain despite the positive directivity. This is caused by loss in the antenna: lossy dielectric material and conductor losses. On lossy substrates like FR4, the gain of patch antennas is pretty bad, and your simulation shows that if you include the dielectric (...)
hi all. ihave designed an antenna and i want to export the radiation pattern text file in FEKO. the exported .ffe file have 7 columns of data but it is not clear what is the data. column 1 and 2 are theta and phi. and i want to know what are the next 4 columns. i think two of them are E_phi and E_theta. but im not sure what are the other
hi all i am tring to plot the radiation pattern of a monopole printed antenna with cst (in gain ieee and polar plot with phi=0 and 90 degress and theta variable ) i got results where it shows that the results iaccurate and directivity less than one ie the radiation pattern is moving out of 0 db what mistake i commited in simulations the (...)
With any antenna, gain equals directivity minus loss. Some antennas are resonant and should be tuned for the best matching at a specified frequency (s11 >10 dB). Wideband antennas are considered if their S11 is poorer over the band width. Low S11 means less RF power supplied from a transmitter is radiated, (...)
if it's about antenna simulation read this
Dear All... Good afternoon Can anyone describe the limitations of the parameter of antenna and other microstrip circuits such as return loss, efficiency, directivity, axial ratio etc. (for example the return must be less than -9.8 db upper and positive values are not permissible and VSWR must have the valve less than 2 for an antenna to (...)
Who says directivity monopole and dipole are same????????? Please read a few books antennas They both have an omni-directional pattern in azimuth Dave
Hi. I have simulated a dielectric λ/4 monopole antenna in (30-400 MHz).now I want to examine the results. So,I extracted gain , directivity and efficiency versus frequency (30-300 MHz) my directivity and gain are maximum in f=300 MHz (Dmax = 3.5 dB),while my resonant frequency is 125 MHz. (...)