Help me to get the l/λ of a SMA connector

i designed a hybrid on RO4003. now i want to get the l/λ.

description of the hybrid:sma(9mm), microstripline(15.6mm), hybrid by Anaren(1.3-2.6GHz), stripline(15.6mm), sma(9mm)

on a NWA i connected the total construction and i measured for a phaseshifting 0°
1GHz -146°
1.5GHz -78°
2GHz -8°
2.5GHz +59°
these values i put in the smithchart and got my l/λ

to get the l/λ of my stripline i used the formula Φ=β*l after i got the phase i went in the smith chart and got the l/λ

and finally i need the l/λ for the sma connector, i know εr=1.5, l=9mm
i need a formula for that, am i right that the sma is frequency dependent?

i need this, because my next design includes a resistive splitter. on channel A i put the splitter on channel B the hybrid. and for calibraion it is important to know the length of both so they compensate to zero. if i know the l/λ of the hybrid i'm sure i can calculate the length of my splitter.

design of spliiter: 50Ω microstripline the divides in 2 parts, both have a resistor (SMD) of 50Ω

hope my description was not to bad.

thanks for help

For estimation of the SMA connector phase vs frequency: connect two identical SMA connectors back-to-back and measure phase vs frequency using a Vector Network Analyzer. Divide the measured phase performance by two to get the single SMA connector phase performance.

what do you mean by back to back?

Added after 5 hours 33 minutes:

i'm one step further.
i got the phase shifting from the SMA.
in summation of l/λ i got 2.57 (aritm middle) λ=c/f*1.5 in my case f=1.8

--> l= 72cm.

is this a realistc length of the splitter? the branchline coupler has a microstrip length of 6mm.

tnx for some help