a Ku-band(about 15GHZ) microstrip antenna design

[huiliangxu]

a Ku-band(about 15GHZ) microstrip antenna design


hi friends

i want to design a Ku-band(working frency about 15GHZ) microstrip antenna .
the first problem is how to chooce the dielect Er(about 2.2 or higher such as 10.2),second is the substrate thickness(i want to use 1.0mm).now,i think useing Er=2.2 and thickness 1.0mm is good. anybody agree with me? if not, i wish experts or my friends to give me advice
best regard
thanks

 

[boy]

The larger Er, the more loss. It is a dielectric loss. You can look at a standard text book for losses of microsrtip antennas.

 

[mr_ghz]

Hi huiliangxu

The higher the er of your PCB, the smaller will your (single!) antenna element be. But also the bandwidth will be lower. If you design an antenna array, the whole antenna won't be smaller even with a high er! So my suggestion use a moderate er of about 3 (2.2 is also OK)

The thickness of the PCB has an influence of the trace-thickness for a 50Ohm trace. the thicker the PCB the thicker the trace. with a 1mm PCB you will get a 50Ohm trace which is more than 1mm thick.... Normally this is not a very good idea, because your 15GHz antenna is also very small (depending on the type of antenna). So I would suggest using a thinner material of about 0.5mm or less. If you must have higher stability of the PCB you can use a 4-layer PCB (which can be thicker)

Take care using a PCB material with a low tand. This is very important for larger antenna arrays. A single antenna will also work fine on a 'bad' material.

Regards
mr_ghz

 

[huiliangxu]

to mr_ghz(a Ku-band(about 15GHZ) microstrip antenna design)

to mr_ghz
thank you!
i will choose your advice
from my best regards!

 

[purushottam]

refer to the book on microstrip antennas by david.m.pozar.you may get a ready reference