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i was designing a matching network in which i designed a open stub of value 185 ohm with 84 degree length.
now the problem is we could only fabricate up to like 65 ohm. i have been told to convert it to lumped component. when i placed its equivalent lumped element i achieve a very...
is there any way i could improve the bandwidth of on the narrow band port...because one of the antenna will operate on wideband port and the other one will operate on narrowband which i dont want to happen
even i tune them properly still one the delta port has narrow bandwidth than the sum port....i think it might be due to structure of this coupler. the 90 degree hybrid is symmetric in structure so it does not experience this sort of behaviour.
does any one have anything else in mind to explain...
i connected my two antennas to the rat race coupler. one to sum port and other to delta port .. when i analyzed input reflection at input port A and input port B, it seems from results that one port is wideband port and other is narrow band port
does some one have the idea why is...
i have connected my coupler with the antenna. so both the input side are terminated in 50 ohm. the only thing i can measure is s11 s22 and s12 and s21.
is there any way i could measure the forward transmission or the s parameters on the other side of the coupler, the ports of...
thanks gys for u help but i was wondering if there is some other way i could implement a distributed capacitor. i have space of 7 mm in total to put in the capacitor but as i said lumped capacitors have very low bandwith
i simulated a 12 pF lumped capacitor in ADS at 900 MHz connected in series and now i want to convert this capacitor to distributed one, i mean to implement this using microstrip line. does anyone know how to do it...i read some literature regarding interdigital capaictor but still...
actually i matched the antenna to 50 ohm and then matched the coupler to 50 ohm as well but as i told u when u combine them the two ports of the coupler are occupied by the antenna. so we are left with only s11 and s14. port 2 and port 3 are connected to the antenna.
i cannot even figure it in...
well i know the what you are talking about but im saying how will i measure the complete system
if coupler and antennas get fabricated on pcb board . i cannot measure them separatly once they get fabricated together
i have connected two antenna to my hybrid coupelr
one of the port is terminated and the other is the input
im thinking how would i measure s21 or s31....forward transmissions.....
i can measure s41 the isolation and s11 the input reflection but how the forward transmisson
i have ADS 2009 update 1 installed on my system. i want to make a 3D antenna. this version contains EMDS for 3D simulation but what si parameters really define a 3D antenna. i mean so i just have to increase the thickness of the copper to make it 3D.
i dont have any idea of making...