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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)
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)
A fully matched Ka-band wideband pseudomorphic high-electron-mobility transistor (PHEMT) 1-W monolithic millimeter-wave integrated circuit (MMIC) high-power amplifier (HPA) without any external circuit is developed. The two-stage HPAs are prepared on 2-mil GaAs substrates with a small chip size of 3.46 ϫ 2.9 mm. At least 10-dB small-signal gain, 29.5 dBm P(More)