This paper presents several microwave power ampl~ier designs that promise high power and broad bandwidth, while meeting the eficiency and linearity requirements of advanced radar and communication systems. Power amplifiers are designed based on an ultra-high f~u~ (>450 GHz) selective buried sub-collector (SBSC) HBT technology [1]. SBSC HBTs are fabricated on prepatterned sub-collector mesas. Th...

A dual-frequency 1.55 µm laser for CW low noise microwave, millimeter and sub millimeter wave synthesis is demonstrated, where frequency stabilization is possible on each wavelength independently. The solid state Er:Yb laser output power is 7 mW. The amplitude noise is -150 dBc/Hz at 1 MHz offset frequency. In free running regime, the frequency noise is 3.10(5)/f Hz/sqrt(Hz) (800 Hz on a 1µs ti...

A compact 1 8 waveguide splitter using a guided-wave microlens array is presented and analyzed to show low insertion loss and output imbalance of 0.28 and 0.15 dB, respectively. The analysis results show that the proposed equal-power splitter with insensitive wavelength responses and acceptable fabrication tolerances is applicable for compact and wide-bandwidth integrated optical devices. © 200...

In this paper, we exploit the potential of positioning technologies in wireless broadband communications, which are based on worldwide interoperability for microwave access (WiMAX), in particular the IEEE802.16* standards. By utilizing the additional features in WiMAX including multiple input multiple output (MIMO), adaptive modulation and coding (AMC), beamforming, relay station and power cont...

For realizing a single chip microwave front-end, we studied the new design theory of impedance matching circuits for a Si-CMOS low noise amplifier (LNA) or power amplifier (PA), which are composed of coplanar waveguide (CPW) meanderline resonators and impedance inverters. We also present the simulated performances of CMOS-LNA or PA connected with input and output matching circuits. Finally, we ...

Employing 130-nm IBM CMOS model parameters, the design of a power-efficient single-stage microwave amplifier is presented in this paper. An optimization technique for the amplifier forward gain is proposed through careful selection of process elements without compromising the architecture’s high degree of isolation and resistance to reflection-loss. A novel mechanism to match port-impedances of...

Impressive microwave results have been published for both Single(SHBT) and Double(DHBT) Heterostructure Bipolar Transistors based upon the InP material system. InP-based SHBTs have been reported to have excellent high-frequency performances such as unity current-gain frequency (fT) of 200 GHz (1) and maximum oscillation frequency (fmax) of 236 GHz (2). The best results for InP-based DHBTs inclu...

All-fiber multiwavelength lasers have attracted much interest recently because of their potential applications in wavelength-division-multiplexing (WDM) communications, microwave generation, highresolution spectroscopy, fiber optic sensing, etc. This paper is devoted to these lasers and several of their aspects, as the laser design, the output power fluctuations, or different kinds of lasers, h...

The design and performance of a 95 GHz pulsed W-band EPR/ENDOR spectrometer is described with emphasis on the ENDOR part. Its unique feature is the easy and fast sample exchange at 4.2 K for frozen solution and single crystal samples. In addition, the microwave bridge power output is relatively high (maximum 267 mW), which allows the application of short microwave pulses. This increases the sen...

Most reported spatially combined or quasioptical amplifier arrays exhibit resonant narrowband performance (<10%) and have not addressed thermal management issues. We report a waveguide-based spatial combining scheme using broadband tapered-slot transitions, capable of realizing full waveguide band coverage (40% fractional bandwidth) with good thermal properties. An X-band prototype using eight ...