High data rate networks are now being designed to rapidly exchange high value sensor and video information among various users located on the surface and airborne. Phased array antennas can provide rapid switching amongst the members in addition to the gain necessary to connect these members. For many applications, these antennas would be configured to either transmit or receive. Designing a phased array antenna that is full duplex significantly complicates the design because much of the emphasis in the design is placed on keeping the transmit energy out of the receive channel. A phased array antenna could be designed to receive only when the antenna is not transmitting; thus the design would only need to protect the receiver components during the transmission. The antenna would be then full duplex. This paper describes a small pseudo full duplex wideband multi-frequency band (X, Ku and K) phased array antenna with +/-27 degrees of the beam scanning, using a novel multi-line time delay phase shifter controlled by a piezoelectric transducer (PET). This antenna design is simple, and would use no more space than an antenna used solely for either transmit or receive. Also, some of the isolation between the transmit and receive channels is achieved using novel low-cost fabrication techniques.