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# Directivity Antenna

186 Threads found on edaboard.com: Directivity Antenna

## Problems related to Antenna

Dear all Can anyone give me the matlab code for the follwoing problem? Write a Matlab progran to calculate & plot 1) Radiation Pattern. 2) directivity 3) Input resistance 4) Radiation Resistance of Dipole antenna having different lengths L=λ/4

## how to find. micro patch antenna results from ie3d

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

## waveguide horn array antenna

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...

## For radiation pattern measurement of antenna

antenna radation pattern measurement requires a test range (best an open area without obstacles), a reference antenna, a transmitter and a calibrated receiver. Details can be found in antenna textbooks and you can google commercial companies offering such service. The pattern is measured relative to a maximum directivity in (...)

## Directivity Plot in HFSS

HFSS allows you to plot 2D & 3D Polar as well as Rectangular plots with a variety of variables. For transmitting antenna designs, apart from the actual E-Field pattern there is a variable called Dir (or directivity) which is DirTotal, DirPhi, DirTheta, DirX,Y,Z etc. What is this though? I thought directivity is a ratio so its a number. (...)

## acceptable side lobes and back lobe levels in derective antennas

antenna stray lobes depend on desired interference levels required for directivity reception or transmission. 15 dBi peak with 0dBi lobes may be adequate for some applications but for a RADAR signal it might need to be -40dBi depending on dynamic range of signals.

## 400 MHz Antenna Problem

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 level, path loss or Receive

## What antenna parameters say to u.. Share..

It is impossible to say what is important without considering the specific application because it changes so much. For satellite communications, directivity and polarization purity are very important. For handheld devices, directivity is usually a bad thing and polarization impurity is more tolerable. In high power systems, a good impedance matc

## Antenna gain Problem having megative value of gain

Do you know why the gain would be negative? What is the directivity of the antenna? Do you know the relationship between the two?

## Planar near-field data from antenna in CST MWS 2014

Hi, I've set up a pyramidal horn in CST MWS 2014 with the following properties: directivity: ~20dBi Design frequency: 10 GHz Waveguide measurements is standard EIA WR-90 x-band. I've simulated this with a E-field monitor and a farfield monitor and the plots for the farfield has good agreement with what was expected from the analysis

## Phase monopulse vs Doppler shift unambiguous angular position

There are other issues such as Rican fading off tall buildings from GPS giving false position, so antenna directivity can be important to reject Rican fading noise. THe only azimuth Doppler track designs I have done used two separated quad helix antenna for 500 mile rocket range and azimuth tracking

## Negative Directivity in HFSS.

The directivity values given are in dB. Look at the definition of dB: x in dB = 10*log(x). Any value smaller then 1 leads to negative dB value. Therefore you have a positive directivity but the representation in dB leads to negative values. Thus the directivity there is very small. Almost every antenna has regions with very (...)

## [CST] Gain value is more then Directivity..WHy is that???

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 Figures below. Which means that my (...)

## Gain problem of dual band microstrip patch antenna in HFSS

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 losses (tand) in the simulation.

## antenna radiation pattern text file in FEKO

Well it depends if you exported gain, directivity or RCS. See pages 14-101 to 14-102 of the FEKO 6.3 User Manual for details on the *.ffe file.

## URGENT Help me ///can the directivity be less than 1 in cst mws

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 gain v

## guided wavelength and directivity

Is guided wavelength lambda g\lambda somehow related to directivity of a patch antenna?

## microstrip antenna gain and directivity

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, also in a (...)

## why directivity is larger than gain in ADS

Hai while i am doing simulation in ADS i am getting the directivity value is little bit higher than gain why this is. Please help me Thank you

## Help regarding parameters study of antenna and other microstrip circuits such as gain

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 (...)

## gain in a monopole wire antenna

Who says directivity monopole and dipole are same????????? Please read a few books antennas They both have an omni-directional pattern in azimuth Dave

## What do you think about my dielectric monopole antenna?

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. actually, my efficiency is best in f=125 (...)

## help antenna project hfss

hi everyone,i have a project in hfss , i get good wsvr and s11 values but i cant have directivity and gain as i want. i uploaded my project here can anyone say what is wrong with my project ? 90907

## hfss antenna design for rectangular patch

i m beginner in hfss can u tell me how plot gain vs freq graph,radiation pattern,directivity vs frequency,co and cross polarization...if any doc then upload...pls help..

## antenna miniature wwith high directivity

hello I have a Project called in designing miniature antenna with high directivity cavity Fabry Perrot I need help I use hfss

## hfss antenna design for rectangular patch

hello everyone.. i have design rectangular microstrip antenna but i dont know how to plot gain vs freq and radition pattern,directivity such parameter... also i m not able to find what that graph represent pls help...

## Quarter wave monopole

Sorry i run CST. In CST you add the FARFIELD option and you see how the antenna radiate the gain directivity etc.... i think it would similar in HFSS

## Radiation resistance and Directivity of Horizontal Electric dipole Antenna above PEC

hi, I trying to plot radiation resistance and directivity of Horizontal electric dipole, but i am not getting correct result as given in Balanis Book. I have also attached graph from Balanis Here is my code, PI = 4.0*atan(1.0); Wave_impe = 120.0*PI; h=5; L=1/50; A = L*PI; Io = 1; r=2; % U=zeros(2000,2000); UMAX=0; k=2*pi; i=0; j=1; a

## How to findout the directivity from gain? & what is the unit of gain & directivity

Can u differentiate the gain from directivity?

## difference in electric field pattern obtained in ie3d and hfss

hi i,ve designed a pifa antenna and simulated it with both ie3d and hfss, gain, s parameters, impedance and directivity are the same but electric field pattern are not!, i know this is caused by difference in method of MOM and FEM but how can i scale voltage source in IE3D or power source in HFSS to get the same electric field pattern regards.

## how to improve the gain of antenna?

hai, I designed a mimo antenna in HFSS v 13. In that, i reached a very good return loss and VSWR. Where as the gain of my antenna is 2dB and the directivity is about 5dB. Since the directivity is high when compared with gain, the efficiency of my antenna gets very low. Kindly, give some tips to improve (...)

## Can anyone explain this about Directivity relation to effective area?

I am learning question 15, It tries to relate directivity with effective area by using two antenna A1 and A2. I can follow the derivation to the last part where we let P_1\;=\;P_2. Then it said according to reciprocity, P_{1-2}

## Using of ferrite rods in vlf antennas

Ferrite rods offer the small size and a good directivity. In basic textbooks you can learn the details

## 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 2.4-2.5 GHZ band? THNA

## Rectangular horn antenna

what is the required diameter of a conical horn antenna operating at 3Ghz with 14dBI gain? what should be the value of directivity for required gain? will you please help me out?

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

hi i ve designed 4X4 microstrip patch array antenna at 35GHZ using ADS the parameters i m getting are returnloss =-25.86 directivity is 18.56 dbi gain= 11.23dbi gain is very low so i want to ask that what is the range of the gain and how can i increase the gain my antenna plz guide me

## Antenna Basics - Directivity formula

theta will be 2*pi indicating 360 degree rotation on 1 plane. This is required not only to find the gain / directivity on the forward direction of the antenna but also to find the FBR in case of a patch antenna. phi will be pi (180 degrees) indicating the forward direction only as the FBR is already computed in theta which will be the (...)

## Relationship between Reactance and phase distribution of an antenna element

In Yagi -Uda antennas; the inductive nature of element is given to the reflector by choosing a length greater than resonant length; And for the director capacitive nature is given by choosing its length shorter than the resonant length; to acheive directivity of beam. What is the relationship between them? And what mechanism makes the element to

## antenna 3dB Beam Width and Antenna Gain

Is there a formula that related the 3dB beam width of a 1/2 wave dipole antenna with the gain of the antenna? Since the a narrower beam on a E field radiation represents more directivity, more gain. I was hoping there is a convenient formula where if you determine the 3db beam width from a antenna (...)

## Return loss S11 (help)

antenna gain is directivity is a given direction. One example where gain is not the only object is for antenna (typically parabolic dishes or segmented parabolic surface) used for space communication. Signal to noise is the main object. Higher antenna gain does not alway mean better signal to noise. In space (...)

## Antenna directivity and gain

What Dot4 has said : 1) radiation efficiency = conduction efficiency and dielectric efficiency 2) antenna efficiency = reflection efficiency, conduction efficiency and dielectric efficiency What drkirkby has said : polarisation loss and mismatch loss don't effect the gain. So as a result : G(Gain)=radiation efficiency*D(directivity) ( i believe

## clarification of a dipolantenna vertical/horizontal polarization via directivity plot

The polarisation of a linearly polarised antennna is by definition the direction of the electric field. All 4 of your diagrams show E plane plots. You have not drawn any H plane plots, which would be circular for a dipole. Two of your dipoles (A and C) are horizontally polarised, the other two (B and D) are vertically polarised. Knowing

## E and H antenna directivity plot understanding

Thanks for responding........I apologize in advance with all the trivial and meticulous questions. I hope you can understand what Im trying to ask. It is normal to talk of "azimuth" and "elevation" in antennas. If the antenna is vertically polarized, then the E-plane diagram shows you how the antenna behave with elevati

## Aperture efficiency of reflectarray antenna

APERTURE EFFICIENCY, 0 The antenna Efficiency, 0, is a factor which includes all reductions from the maximum gain. 0 can be expressed as a percentage, or in dB. Several types of "loss" must be accounted for in the efficiency, 0: (1) Illumination efficiency which is the ratio of the directivity of the antenna to the (...)

## surface wave in momentum ads?

hi. how we can visualize surfaces waves in momentum ads ? thank u and when i simulate antenna patch with heigth of substrat =h1 , and after i increase heigth to h2 , I get a enlargement in the bandwidth and an augmentation in directivity and a diminution in gain this is due to surface wave , because my antenna is well adapted , and i

## how can we increase gain of colplanar patch antenna

Hi There are many ways to do that... It depends on the fabrication facility you have. The simplest is to make antenna array, other than that you can use periodic structures in substrate (meta material) to increase the directivity. There are many papers on what so called superstate and how it increases the gain cheers,

## need help in desigining microstrip antenna.

Hello. I need to design microstrip antenna with these dimensions 60.6mm x 55.5mm on FR4 and my requirements are gain and directivity should be higher than 6dBi and efficiencies should be higher than 90 %, the feed can be microstrip or coaxial. i have used microstrip line feeding but i m not getting gain and directivity higher than 6 dBi, (...)

## patch antenna for 100 MHz in HFSS

hi everybody i have designed a patch antenna in HFSS for 100 MHz i am getting fine RL at 100 MHz but the other antenna parameters gain, directivity etc. are not quite well , i am unable to understand this problem can anyone help me in this regard please, my email id in engineermohsinali@gmail.com, if any expert is interested i can se

## hfss rfid iput power problem

hy for all I'm trying to simulate rfid microstrip antenna with complex input impedance witch 25.5 +145*j i used a lumped port for the exitation my problem is that when i use a power of 1w as source i find in result incident power = 5.74 accepted power = 0.17 radiated power is 0.06 the obtained gain is 0.45 and the directivity is 4.82

## Measurement of circularly polarized antenna

Hello, I would just like to ask how to compute directivity (D) that is computed from two cuts of radiation patterns, for circularly polarized antenna. For normal antenna (linear polarization) you take vertical and horizontal plane (E and H). If you have antenna with dipole, the dipole is once horizontally and second time (...)