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113 Threads found on Antenna Gain Directivity
gain antennas are a poor choice for gps. Their directivity will produce negative gain in other directions. These satellites cover the whole half sphere sky. You need to be able to receive signals from them wherever they are.
hello i want to know that if i want to deisgn the wlan antenna then what should be its return loss gain directivity efficienies etc etc and other related parameters?
1) I not sure the "gain" on radiation pattern is refer to Power gain or directivity? The unit is in dBi. In dBi means antenna gain in dB relative to isotropic radiator. 2) I am getting negative "gain" on radiation pattern (E-field). I read from article is antenna Loss. (...)
For "industrial grade" testing you will need a test range, and evaluate all required parameters in a free space. You can use an anechoic chamber with special equipment to do it. There are special laboratories which can test your antenna to specifications, and give you an evaluation result to prove your antennas meets "industrial-grade".
antennas by John Kraus is also an excellent book. He provides the theory on many types of antennas and has many practical design examples.
Hello, I am a bit confused about the notion of partial directivity and gain. According to textbooks and papers the total directivity is defined as the sum of the partial directivities (the same for gain). But the common practice to get the sum of two orthogonal vectors is to take the vector sum. i.e. Instead of G (...)
Hi all, I have developed a patch antenna with gain around 8dBi. I want to theoratically justify it. Belanis states that if width of the patch is less than lamda than it would directivity is around 8.2 dB. My antenna has the same directivity. Now in order to verify gain I have to do (...)
HFSS calculates directivity, gain, and power radiated, but I was wondering if I can measure them physically (without a simulator). If so, what equipment, technique, etc. is used for that? Please reply ASAP as I have a presentation due soon. Thanks
i'm designing vivaldi antenna with centre frequency 3.3 Ghz (2GHz -4GHz) using CST. Taper length of antenna is 90.9mm for 3.3 GHz. Aperture width 48mm(ie; > 45.5mm). Its having microstrip to slotline transition from 50 ohm to 100 ohm. I am getting efficiency >100%(because gain is more than directivity). how to (...)
Hello I have designed a single patch rectangular antenna with a waveport and an inset fed. I'm trying to do patches to this antenna and I'm not getting the right results! I'm loosing gain and directivity! Can anyone help me out with this? I can send you guys the single patch! Thanks, Sam
I am wanting to lower the bandwidth of microstrip antenna circular. What parameters can I change to reduce bandwidth. Thanks.
Hi all, I am designing a VHF small antenna using HFSS. Since it is a narrow-band antenna, I need to simulate the matching network to maximise the received power. Do you know what is the best way to do that, once I have the S11, Z11 and Y11 parameters? Thank you.
passive test is as described above, tests of radiation patterns, gain/directivity/efficiency etc... active test can mean many things, but more often than not involves test of the antenna integrated with the intended electronics and running tests within an anechoic chamber that emulates the intended RF environment. The end result is often (...)
single element vivaldi antenna designing 2-4 ghz of gain 3dB
hello i have designed and simulated a micrpstrip antenna by using Ie3d the parameters i m getting are Fr=6.51 returnloss =-30.86 reflection coffient =0.03 mismatch loss =0.00 vswr= 1.06 directivity is 7.56 dbi gain= 2.56 dbi gain is very low so i want to ask that what is the range of the gain (...)
It's not clear to me, why you want to use a helix antenna and which kind of helix antenna you're referring to. The shown picture is rather suggesting a simple λ/2 dipole. If you intend higher directivity respectively gain, a yagi antenna would be first choice.
hello, I have been using HFSS to design an antenna at 867Mhz.But the gain that i am getting is -4.9bd and directivity around the same.I have miniaturized the patch antenna.I have even physically implemented it with a reader and got 5 feet range for the tag in vertical and horizontal orinetation.But as the (...)
May i know the procedures and set-up to measure antenna efficiency ?
One way to change the phase between elements is to feed them with transmission lines with different lengths. One scheme to move the array beam is to include switches and different line lengths to shift the array patten. Negative gain isn't necessarily wrong (although in this case I would think it indicates an error). gain is directivity (...)
hi can any one help to get calculation of antenna gain from the total radiated power ver. frequency.