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In this paper, a transmitting active array with spatial power combining concept for selective spatial linearization is implemented. The main nonlinearity of PHEMT device is used to describe some characteristics of its intermodulation distortion behaviour. An auxiliary branch is added for cancelling the third order intermodulation distortion (IMD3) of the main branch without diminishing its gain. A...
In this paper, a frequency agile phase-conjugating active antenna is presented, for its use in full-duplex and secure retrodirective communication links. Two enhancement-mode PHEMT's are properly combined to simultaneously act as a subharmonic and a 180-degree singly balanced resistive mixer, allowing downconversion of an AM interrogating signal as well as retransmission of a BPSK response. A varactor-controlled...
This paper presents an active reflectarray with the capability of steering the main beam and achieving different amplitude distributions. The amplitude and phase of the scattered field from each reflectarray element is controlled by the use of an IQ modulator. An aperture coupled patch with perpendicular microstrip feeds is employed as radiating element. One of its ports is employed to receive the...
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