From WikiAhmadiyya, the free encyclopedia on Islam and Ahmadiyyat

In some mosques men and women pray in the same hall, as was the case at the time of the Prophet of Islam, Muhammadsa. As women may feel uncomfortable during the prostration position of prayer if men are standing behind them, the female worshipers usually stand behind the men or at the opposite side of the hall.

However, some women may feel greater independence and comfort in a dedicated prayers space for Muslim women. So, in many modern mosques two seperate halls are built, with one reserved for women. In mosques built by the Ahmadiyya Muslim Community where this is the case, generally the prayer space is divided equally between men and women and a local women's committee is elected by the female worshipers to independently run the women's area of the mosque. 

See also