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A connectorized RF MEMS tunable two-pole band-pass filter is demonstrated as the first all-silicon evanescent mode cavity filter operating in the K-Ka band. All filter components are fabricated with cost-effective silicon micromachining techniques. The filter's poles are controlled by two micro-corrugated MEMS diaphragms that are engineered to be independently controlled with voltages below 140 V...
This paper presents a linear high efficiency three-level polar DSM based transmitter that is adequate for wireless RF applications. The polar DSM runs at low sampling frequency that is related to the used oversampling ratio and the bandwidth of the signal standard. Through simulation, a high coding efficiency and high linearity can be achieved concurrently by adjusting the power level of the input...
Two broadband VHF MMIC power amplifiers using GaN HEMT transistors are described in this paper. The first circuit exhibits a PAE ranging from 85% to 51% in the 15MHz – 500MHz bandwidth. The second circuit is a self-biased design and demonstrates a peak PAE of 75% at 100MHz for 13.5W output power in a similar bandwidth. The self biased topology enables a higher bias voltage and therefore higher output...
This paper presents for the first time measurement data on in-vivo dermatological experiments verifying the performance of a millimeter-wave medical probe designed for skin-cancer diagnosis. The probe consists of a micromachined silicon-core dielectric-rod waveguide, which is metallized and tapered at its tip as a compromise for high field concentration at the probe-to-skin interface, high sensitivity,...
For the first time, a rectangular waveguide (RWG) isolator realized through inkjet printing on a ferrite substrate is presented. Yttrium iron garnet (YIG) substrate is used for the realization of the ferrite-filled isolator. Contrary to the substrate integrated waveguide (SIW) approach, all four walls of the waveguide have been inkjet printed on the YIG substrate demonstrating the utility of inkjet...
The design, packaging, and characterization of a 70–95 GHz downconverter with 25 GHz of instantaneous bandwidth is presented. The circuit features a novel LO pass-through feature, making it suitable for integration in two-dimensional focal plane arrays with large-N. The chip has been packaged in a waveguide module and, in the packaged configuration, has a noise temperature below 2000 K (9 dB NF) and...
In this paper, a dual-channel interferometer-based capacitive sensor with high sensitivity is implemented in 65nm CMOS. Such architecture facilitates high throughput flow cytometry applications using intrinsic EM signatures of biological cells. To enhance SNR, injection-locked oscillator is utilized to perform phase amplification with regard to capacitance-induced frequency shift. Noise from on-chip...
This article presents the design approach, realization and measurement results of a highly efficient double octave wideband power amplifier using a GaN-HEMT bare-die. An iterative approach to obtain the optimum source and load impedances is described. Multiple harmonics are analyzed using harmonic load-pull simulation and a reliable large-signal device model. The design was realized exploiting a transition...
Frequency modulated continuous wave (FMCW) radar is moving from long range detection to indoor short distance target monitoring and has already demonstrated its unique advantages over other approaches. The state-of-the-art coherent FMCW radar, especially, can provide very accurate result in small motion signal detection. However, the performance is sensitive to the clutters that surround the target...
We propose a fast and scalable method to model spiral inductors in the presence of metal fill. The method is based on the PEEC technique combined with an extension of methods to incorporate metal fill parasitic effects in spiral inductors. For representative test cases we observe a degradation in peak quality factor of 20 – 30% due to metal fill. The errors in the estimation of peak quality factor...
This paper presents micromachined planar coaxial probes integrated with the active circuits for tumor detection and low-power cancer ablation. A multi-state reflectometer (MSR) consisting of a dual-band PLL, an impedance tuner, two power detectors, and a directional coupler is employed to extract broadband dielectric parameters of the tumor cells. The active circuits are integrated on the micromachined...
This paper proposes multi-mode transferred power amplifier design. Several discrete frequency points, along with their second and third harmonics are controlled simultaneously by a special output matching network in PA. It allows the PA to transfer its mode to different typical high efficiency classes in these deliberately selected frequencies, which are referred to LTE and 3G systems. The measurement...
A highly linear and efficient 1-bit digital transmitter with envelope ΔΣ modulation (EDSM) is presented. Analyses and simulations reveal that the EDSM scheme is robust for distortion in output waveforms, and this has been experimentally verified using a CMOS EDSM IC and a GaN class-D PA for the 700-MHz band. The transmitter achieves an average ηD of 56.3% and an ACLR of −39 dBc for a 5-MHz BW and...
Microwave energy for machining is being explored in the recent time. A customized applicator was used with magnetron for drilling perspex material. Microwave energy was applied at 2.45 GHz, 700 W for 60 s on a nickel coated steel wire drilling tool of Φ 0.45 mm. Tool and work material behavior in the entry and exit of the drilled holes have been studied. Thermal damage of the tool affects the accuracy...
The scientific collaboration between Prof. Arthur A. Oliner and the group coordinated by Prof. Paolo Lampariello at “La Sapienza” University of Rome (i.e., the ‘Roman Leaky Group’) is reviewed in its historical development over about twenty years stating from the eighties. The main topics addressed are: leaky-wave antennas (LWAs) for millimeter waves based on groove guide, stub-loaded rectangular...
This paper proposes a two-pole two-path mixed coupling tunable filter with a constant bandwidth. A novel frequency dependent I/O structure is presented to generate up to five adjustable transmission zeros (TZs) without increasing the order of the filter. Thus, the selectivity and the out-of-band rejection are enhanced simultaneously in a very compact size. With the coupling characteristic deeply analyzed,...
The measurement of a hundred-watt level 2.45 GHz near-field rectenna with a two-layered structure is presented. The large power capacity of the rectenna is realized by assigning the input microwave power with a power divider and using Schottky diodes array. A 2×4 sub-array, namely 16 rectenna elements, constructs the receiving sub-system. In a near-field wireless power transmission system, a regulated...
This paper presents a fully integrated triple-band CMOS hybrid-EER transmitter for WCDMA/LTE applications. The operation frequency bands are 0.8/2.3 GHz for LTE and 1.9 GHz for WCDMA applications with multi-band class-E power amplifier (PA) using a power cell resizing technique and a multitap transformer. The multi-mode envelope amplifier support 3.84-MHz WCDMA and 5-MHz LTE signal with a dual-switching...
An active 7-stage L-band bandpass filter with high out-of-band rejection is presented. The LC equivalent prototype of the bandpass filter is designed and optimized to absorb parasitic capacitances introduced by the active inductors. The active filter employs active shunt and series inductors. To the best of our knowledge, it is the first time that active series inductors are used for wideband bandpass...
This paper discusses the dependence of the efficiency of the Doherty power amplifier, DHT PA, on its load-pull ratio, i.e., the ratio between the small-signal and the full-power load resistances presented to the intrinsic transistor of the carrier (or main) DHT PA. The study starts by explaining which are the physical mechanisms responsible for the observed drain efficiency dependence on drain resistance,...
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