A novel low-cost beam-steering technique based on the extended-resonance power-dividing method
A novel phased array based on the extended-resonance power-dividing method has been presented. This method eliminates the need for separate power splitter and phase shifters in a conventional phased-array system, resulting in a substantial reduction in circuit complexity and cost. As a proof of principle, a 2-GHz extended-resonance-based phased array using varactor diodes and microstrip patch antennas has been designed, fabricated, and tested. The measured scan range is 20/spl deg/ and the measured efficiency of the extended-resonance phased-array feed is typically 80%, which corresponds to 1 dB of insertion loss.
An eight-device extended-resonance power-combining amplifier
An extended resonance technique for designing power amplifiers is investigated. This technique provides a planar power-combining structure whose primary distinction from conventional structures is that it does not require quarter-wave or multiple quarter-wave spacing between devices. A theoretical analysis of extended-resonance combiners is presented, followed by experimental data from an eight-device power amplifier. This approach is adaptable to monolithic circuit-fabrication techniques and should be useful for millimeter-wave applications.
A 150 W E-mode GaAs power FET with 35% PAE for W-CDMA base station
A 150 W power FET for W-CDMA base stations has been developed. This FET combines four enhancement-mode (E-mode) 40 W FET chips newly developed and implemented in a package in a push-pull configuration. A saturation power of 51.8 dBm (150 W) and an associated 12 dB linear gain were achieved with this device at 2.2 GHz. A third order intermodulation distortion (IM3) obtained at the average output power of 47 dBm was as small as -36 dBc, providing a power added efficiency (PAE) of 35%.