Abstarct: In this study, four novel structures are introduced using graphene surfaces. Two new microstrip antenna with the capability of tuning polarization between linear, right-handed and left-handed polarization are proposed. The main idea in the proposed antennas structure is the use of several narrow graphene strips in the middle sections and edges of a common square patch. Graphene tapes are activated and deactivated by two different levels of DC voltage, depending on the change in graphene surface impedance. The simulation results show that the proposed antennas can change the polarization of radiation in two or three different modes in the X band. However, the change in graphene bias voltage does not have a damaging effect on other antenna parameters. The third proposed structure is a radar cross-section reducer with adjustable working frequency. The main idea behind the design is to change the frequency of the broadband structure by changing the impedance of the AMC cells. This is accomplished by using the graphene conductivity controllability through the use of an electrical bias. Using three levels of bias voltage, the RCS can reduce the RCS value in 3.87 to 27.16 GHz to less than -10dB in three different bandwidths. In forth proposed design, by using graphene as secend substrate, an ultra-wideband structure in order to reduce RCS is designed that which can reduce the RCS in 0-60 GHz to at least -8dB. These structure is not sensitive to the angle of incident wave, and acts in both modes of transmission of TE and TM similarly .