Learn More
A new dual-band RF transceiver is presented for 2.4- and 5.2-GHz multistandard wireless local area networks. The proposed dual-band RF transceiver integrates a concurrent dual-band front-end, a triple-band frequency synthesizer, and a band-sharing in-phase/quadrature modulator/demodulator to maximize component and power reuse. The design is started with the(More)
A low-temperature-cofired ceramic (LTCC) bandpass filter with high stopband rejection is presented for multistandard coexisted wireless communication applications, such as the integrated wireless local area network (WLAN)/wavelength code-division multiple access handset, the dual-band triple-mode WLANs, and the global system for mobile communications/global(More)
A novel dual-mode ring resonator with self-coupled segments, called a self-coupled ring resonator, is proposed. The self-coupling between ring segments provides the same mode perturbation effect as the conventional methods of adding stub, cutting notch, or varying line impedance on the ring resonator. The mode perturbation and transmission-zero generation(More)
Nitride-based light emitting diodes (LEDs) with internal electrostatic discharge (ESD) protection diodes emitting at 460 nm were proposed and realized. By building an internal GaN p-n junction diode, negative ESD induced pulse current could flow through the protection diode without damaging the major LED. It was found that operation voltage and ESD(More)
Changes in electrical as well as surface composition such as chemical and electronic properties of Mg-doped p-type GaN by phosphorus implanting are systematically investigated using Hall effect and X-ray photoelectron spectroscopy (XPS) measurements. It is shown that p-type conductivity of Mg-doped GaN can be improved by implanting P atoms after a proper(More)