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Maybe it is not a simple way, but normally, similar case for me, I will use cadence allegro complete layout, then import spiral model into HFSS for 3D EM analysis, then optimization lump-model in ADS based on HFSS results.
As I know, it is required omnidirectional antenna for RFID application.
I am not clear about your requirements in your application. Normally, in order to increase the Transmit range, two options are chosen, one is increase the TX power, another one is optimize the directive pattern of the TX...
I do not think it is a better choice to layout with ADS.
Several commercial professional layout tools are available, cadence, mentor, protel, power PCB etc....
what's the operating frequency?
you can design a matching network for each arm of the dipole to convert the (150+160i)/2=75+80i to 25Ohm, then quarter wavelength balun can be connected after that matching newtwork?
below is an example(f=2.4G):
nimra,
Are you clear about the out impedance when 4mW output power from hm-t module?
If you know, 30Ohm is assumpted, then you can refer to the PI-Attenuation/T-Attenuation mentioned by vfone
Here is for your reference:
I totally agree with vosh.
Actually, it is not necessary to make same stripline as datasheet. You can get the characteristic impedance of the this stripline with material described in datasheet, then you can design your own input and output transmission line with your own materials, any type TL...
For third concern, I would like to know the dynamic range of the transmitter power,40dB or 60dB?
I am developing a NMR PA which has 60dB dynamic range, but for application, 40dB is enough? If 40dB, it can be realized by digital attenuator in DDS module I think.
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