antenna-theory.com Antenna Theory    FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Search found 16 matches antenna-theory.com Forum Index Author Message   Topic: what's the meaning of the VSWR representation as VSWR:1? Rfdesign Replies: 2 Views: 10223 Forum: Questions Related to Antenna Theory   Posted: Sat Feb 11, 2012 2:01 pm   Subject: what's the meaning of the VSWR representation as VSWR:1? Yes, VSWR = 2.5 is the same as VSWR=2.5:1 Really, there is no reason. Maybe some people think it is important to stress that it is a ratio, but really it still just measures reflection coefficient ...   Topic: what's the meaning of the VSWR representation as VSWR:1? Rfdesign Replies: 2 Views: 10223 Forum: Questions Related to Antenna Theory   Posted: Sat Feb 11, 2012 5:06 am   Subject: what's the meaning of the VSWR representation as VSWR:1? Dear friends there is an important question for me that may be easy for you. I really thank if someone reply my question.I want to know: what dose mean vswr 2.5:1? Is this different from vswr=2 ...   Topic: question about antenna Q Rfdesign Replies: 1 Views: 8224 Forum: Questions Related to Antenna Theory   Posted: Wed Jan 25, 2012 6:59 pm   Subject: question about antenna Q I don't understand what's the relation between the Q and the input impedance of an antenna as mentioned in the following link: http://www.antenna-theory.com/definitions/q.php why "The higher th ...   Topic: mode in patch antenna Rfdesign Replies: 6 Views: 18054 Forum: Questions Related to Antenna Theory   Posted: Wed Jan 25, 2012 6:55 pm   Subject: mode in patch antenna Dear Abu Maria It may be useful for you. in the Balanis Book in the chapter 14 in the Patch antenna in the Fig14.14 and Fig14.18 there are radiating and non-radiating faces also because of the equa ...   Topic: how can we calculate the radiated power? Rfdesign Replies: 2 Views: 10471 Forum: Questions Related to Antenna Theory   Posted: Mon Jan 16, 2012 3:22 pm   Subject: Re: http://www.antenna-theory.com/definitions/sar.php You can't calculate radiated power from s11. For instance, if you measure a 50 Ohm resistor, the vswr=1, the s11=0 (-inf dB), but the radiated power is 0. You need to know the delivered power and ...   Topic: how can we calculate the radiated power? Rfdesign Replies: 2 Views: 10471 Forum: Questions Related to Antenna Theory   Posted: Mon Jan 16, 2012 6:41 am   Subject: how can we calculate the radiated power? dear friends hi I embedded an antenna in a lossy medium and I know the S11 and deliver power 1w but i don't know, how should I calculate the radiated power? the return loss Figure is resonated at 4 ...   Topic: what's the effect of a superstrate in Microstrip antennas Rfdesign Replies: 2 Views: 10046 Forum: Questions Related to Antenna Theory   Posted: Fri Jan 13, 2012 4:43 pm   Subject: Re: microstrip antenna A superstate on a microstrip antenna would be equivalent to a slight increase in the substrate permittivity. Basically, when you surround an antenna with a dielectric (known as dielectric loading), ...   Topic: what's the effect of a superstrate in Microstrip antennas Rfdesign Replies: 2 Views: 10046 Forum: Questions Related to Antenna Theory   Posted: Fri Jan 13, 2012 5:58 am   Subject: what's the effect of a superstrate in Microstrip antennas suppose we have a microstrip antenna like this: http://www.antenna-theory.com/antennas/patches/patch2.jpg then we add an additional layer exactly same with the substrate on the patch radiator,so ...   Topic: important question about S11 Rfdesign Replies: 0 Views: 8117 Forum: Questions Related to Antenna Theory   Posted: Mon Jan 09, 2012 4:39 am   Subject: important question about S11 hi I've really confused about the reflected power and radiated power in the following link: http://www.antenna-theory.com/definitions/sparameters.php what's difference between reflected power and ...   Topic: equivalent circuit of an antenna Rfdesign Replies: 2 Views: 10575 Forum: Questions Related to Antenna Theory   Posted: Sun Jan 08, 2012 12:18 pm   Subject: equivalent circuit of an antenna thanks for your reply. I'll read and ask if it exists yet.   Topic: how can we create a capacitive loading Rfdesign Replies: 2 Views: 10392 Forum: Questions Related to Antenna Theory   Posted: Sun Jan 08, 2012 12:16 pm   Subject: how can we create a capacitive loading Dear Schubert Thanks for your useful reply you mean the capacitive loading is something like this: http://8207.4.img98.net/images.php/i3074_antenna-question.jpg That is from the ground plant t ...   Topic: how can we create a capacitive loading Rfdesign Replies: 2 Views: 10392 Forum: Questions Related to Antenna Theory   Posted: Fri Jan 06, 2012 5:55 pm   Subject: how can we create a capacitive loading hi in the following figure http://www.antenna-theory.com/antennas/patches/pifa.php I want to know : what's the effect of this loading? Do we put something in the mentioned position to create the ...   Topic: equivalent circuit of an antenna Rfdesign Replies: 2 Views: 10575 Forum: Questions Related to Antenna Theory   Posted: Fri Jan 06, 2012 4:39 am   Subject: equivalent circuit of an antenna hi I want to draw the equivalent circuit of an antennas but i don't know how should I draw it?I simulated my design in CST. How should I calculate the lumped element of each segment of the radiator? ...   Topic: help about Electric field distribution Rfdesign Replies: 1 Views: 7626 Forum: Questions Related to Antenna Theory   Posted: Thu Jan 05, 2012 11:40 am   Subject: help about Electric field distribution I think this result appears because when we increase the width of the radiator actually we reduce the resistance of the radiator sheet ,don't we? any idea?   Topic: smith chart CST Rfdesign Replies: 1 Views: 9833 Forum: Questions Related to Antenna Theory   Posted: Tue Jan 03, 2012 7:51 pm   Subject: Re: smith chart CST I can plot the S11 parameter during parameter sweep for example 2 simulations but I cant get these 2 simulation into the same smith chart. I got following error message: Plot error: No complex ...   Page 1 of 2 Goto page 1, 2  Next All times are GMT Jump to: Select a forum The Antenna Forum----------------Questions Related to Antenna TheoryNews  Powered by phpBB © 2001, 2005 phpBB Group