Erick Emmanuel Djoumessi

Learn More
A low-cost frequency-agile dual-band direct conversion receiver is proposed and experimentally validated for cognitive radio systems. The receiver is composed of a varactor-tuned six-port front-end module as a unique tunable device. Two tunable types of receiver architectures are also proposed and analyzed. The architecture based on a tunable six-port(More)
A low-cost dual-band low-noise amplifier (LNA) is proposed and demonstrated for WLAN IEEE802.11b/g/a standards. A sufficient dual-band gain is achieved on the basis of cascaded two single-stage amplifiers. The LNA is realized in our standard Print Circuit Board (PCB) surface-mount technology with discrete components. Dual-band operating frequency ranges of(More)
A varactor-based tunable diplexer is proposed and experimentally validated for IEEE802.16 standard-based system applications. The proposed transmit/receive (Tx/Rx) diplexer consists of two tunable dual-mode bandpass filters. Size reduction and band tunability are achieved by using the capacitance of varactors diodes. With two-tone nonlinear characterization(More)
A cost-effective planar packaged diplexer was designed, fabricated and measured for X and Ku-band applications. The miniaturization and selectivity of the diplexer are achieved by using a dual-mode resonator concept. The packaged diplexer has shown a low insertion loss of 2.6 and 2.95 at 10 GHz and 15 GHz center frequencies, respectively. Four transmissions(More)
A reconfigurable direct conversion receiver front-end for GSM and WLAN bands (1.9 and 2.4 GHz) is proposed and demonstrated for cognitive radio system applications. The RF front-end platform makes use of a silicon varactor-tuned bandpass filter in connection with a tunable six-port demodulator. Varactor diodes of both of the tunable structures are(More)
  • 1