A useful, low cost, low complexity, and one layer microstrip slot L band antenna for secondary surveillance Radar (SSR) application is presented. The printed circuit feed network is a rat-race divider to create sum and difference ports and sixteen unequaled power dividers to satisfy the Chebyshev distribution. The feed network has an equally length parallel structure that create constant group delay in all output ports and wide frequency bandwidth. The suggested structure is a one-layer slot array of 2 × 8 slot elements that are fed with a microstrip corporate feed network. To improve total frequency bandwidth the slots are designed with unequal lengths. A substrate with low permittivity is used to decrease the side lobes. A 2 : 1 VSWR bandwidth of 9.4% is achieved with the presented geometry in simulation to cover the 1030 ± 10 MHz transmit and the 1090 ± 10 MHz receive frequency band. The antenna gain for the sum pattern is 18.5 dB and 19 dB at 1030 MHz and 1090 MHz, respectively with a 3 dB beam width of 52◦ in elevation and 9.5◦ in azimuth. The difference has a −19 dB null at the peak of the sum pattern and an acceptable pattern against the sum pattern for SSR applications. Furthermore, the antenna has no need of the back fill antenna to eliminate the back lobe, which is critical for SSR applications. Its low complexity structure makes it appropriate for many radar applications.