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# Using Dbi

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24 Threads found on edaboard.com: Using Dbi

## Question regarding the antenna gain

Hi I designed an antenna on hfss according to an ieee article. I am shure that there is no mistake in my design. When I simulate(analyse all) my design, it gives me a maximum peak gain of -0.0138 dB. On the ieee article, it says that the antenna max gain is between 0.5 an 1 dbi and that the measured peak gain was obtained using the gain transfer m

## Eight antenna array using hfss

I want to simulate an 8 antenna array on hfss and it takes alot of time How can i calculate only 2 antenna or activate 2 antenna in the simulation And how can i combine the radiation patern for the array in hfss i only know it in CST

## Query about gain of UWB MIMO antenna

I have designed an UWB MIMO antenna using low cost FR4 substrate. I am getting negative peak gain (-4 dbi) in lower and middle frequencies. But at higher frequencies, I am getting around 1 dbi. What would be the reason for this? The size of the UWB MIMO antenna is 50 mm x 50 mm. What is physical significance of negative peak gain?

## how to plot antenna gain vs frequency in dbi using HFSS

i am learning hfss, please help me to plot antenna gain vs frequency in dbi directly. HFSS 3 have only following unit db, dbm, dbwm, dbc then how to plot in dbi, help me!

## 28 dbi Parabolic anntnna

28dbi gain dish antenna definitely should solve your wireless communication issue at 10km distance, even your WiMAX system works in 5.8 GHz band (and not lower bands as 2.5 GHz or 3.5 GHz). The only problem when using dish antennas for terrestrial communications is that they have very narrow beamwidth, and to make a proper point-to-point connection

## Validity of Friis equation

The gain of an antenna is usually directional. A simple gain value states the max gain of the main beam. If you aren't using the main beam you need the gain value for the used direction.

## Basic Question: Dipole gain dBd or dBi ??

A basic question! I have two Dipole antennas, which are identical and I conduct an experiment. I use VNA to connect them to two ports and measure S21. How do I calculate the gain of using Friis transmission equation? using , S21 = Path Loss + Gt + Gr Here Gt = Gr = G So G= (S21- Path Loss)/2 and knowing measured S21 and calculated path l

## negative gain problem

sir i design a multiband microstrip H-shaped antenna using HFSS for DCS, WiMAX and WLAN application. I get three desired frequency which are 1.8268 GHz, 2.6352 GHz and 5.284 GHz. the gain at 1.8268 GHz is come negative -9 dbi GHz. How can correct the gain at this frequency.

## free space path loss

Without knowing the Tx and Rx antenna gains that is difficult to know but at a very simple level and assuming ideal omnidirectional antennas (0 dbi gain) it would be -82 dB. Path Loss in free space Signal level is not measure in dB, but again using simple assumptions, Tx power of 1000W is 60

## Slot antenna with additional metal plane

Hello everyone, I'm designing dual-polarized planar slot antenna using cst. The shape of slot in ground plane is simple rectangular. Simulation of my system shows me the gain which has two maximums of about 4.2 dbi. To increase the gain i put metal plane under my system and the gain became 7.5 dbi. Could anyone help me with understanding (...)

## How to increase the gain of the microstrip patch antenna array in ADS

Hi, I'm designing a 4X1 microstrip patch array antenna (microstrip line feed) at 2.4-2.5 GHZ band using ADS the parameters i m getting are returnloss = -25.8 db directivity is 12.65 dbi gain= 12.7dbi the problem is that im getting very narrow bandwidth of only ~30MHZ, how can i increase it so it'll cover most of the 2

I want to plot the Gain (dbi) vs Frequency (GHz) of an antenna on a 2D graph using: HFSS -> Results -> Create Far Field Report -> Rectangular Plot but have a different trace for each variation of a parameter which was swept using HFSS -> Optimetrics Analysis -> Add Parametric I have used a Discrete frequency swee

## planar CPW fed Yagi uda antenna

hii all, m simulating a CPW fed planar yagi uda antenna on RT Duroid substrate...can anybody tell me how to get gain value in dbi using HFSS step by step after simulating the structure??

## How to see gain in dBi in HFSS v.10?

Hello, Please anyone suggest me how to see gain in dbi unit using HFSS v.10. I am trying to see the peak gain over a frequency sweep, with phi=0 & theta=0. From Antenna Params -> Peak gain ->dB, is that ok? (I did not see any option as dbi or dBd). What's the exact procedure or am I confused somewhere....anybody pls help!![/

## please guide me in my design of antenna

Hard to believe that you can get more than 2.35 dbi of gain from this kind of antenna using FR4 (I assume the resonant frequency is 6.5GHz)

## how to increase gain, Z parameter??

hi..i'm in the process of manufacture of microstrip antenna using HFSS version 10.. but, i got problem, i can't get the best result of gain, VSWR and Z parameter...they point is always deviated... for your information, i want to make rectangular microstrip antenna,, array,with gain 11 dbi minimum, VSWR ≤ 1.5 and load impedance 50 Ω

## What does negative value of the gain (ETheta) mean for patch antenna simulation?

Hi there, The patch antenna simulations using Ansoft gave me the Gain(ETheta) in NEGATIVE value. May I know what does it implies? Thanks for the reply :-)

## questions of atenna test thanks

Feed direct the antenna from the generator using a 50 ohm coaxial cable, and for substitution use a λ/2 dipole antenna (resonating at the same frequency as the Digikey antenna). To find the gain in dbi (isotropic antenna) from the Dipole gain in dBd: Gain of λ/2 Dipole dBd = 2.15 dbi

## High gain 3.5 GHz antenna

I have tried the following, i have designed a two half wavelength 3.5 ghz antennas with the a phase shift in the middle using a meander line, I am not sure if this can be done. Does anyone with experience of designing these antennas be able to help out.... The file is HFSSv11

## How to calculate the Antenna gain

There are a number of ways to estimate the gain of an antenna. Here is one: G dbi = 10 log10 ( 4 Π (effective aperture area) / λ?) * efficiency The distance on the surface of the earth may be calculated using spherical trig. Look up the details is Bowditch ( a bible in the boating world). Added after 7 m

## 120 Sectorial Antenna - Microstrip Stacked Patch?

How I can obtain 120 degree of coverage using microstrip stacked patch? I think that i can use phased array, but when i use this my cross polarization level increase and i can't control my vertical pattern. I use amplitude tappers to control my vertical sidelobes, i use 8 stacked patches for 14.6 dbi of gain, i need cross polarization level

## CST waveguide port error..

I only started to design antennas in a week.. sorry for the very basic question. I´m designing a commercial patch antenna (just to learn using cst), using an discrete port, cst gives the the dbi value that the antenna specifies...but s-db, polar, VSWR is not working very well.. so i started to use "waveguide port", but i have this error: (...)

## Where can I get information about Balun filters?

If the return loss of your PIFA at antenna connector is ok, and if you are using a good shielded coax cable, your pattern measurement should not be affected.

## Antenna design required ??

Hi, I am working on a design of RHCP antenna having a minimum gain of 18dbi with a beamwidth of 40-50 degrees. The maximum I can achieve is 12 dbi with 60 degrees beamwith using conical ridged septum polarizer. Can somebody tell me that is there any way to come close to my requirement. Any new antenna or a new configuration would be (...)