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A first-of-the-kind 28 GHz antenna solution for the upcoming 5G cellular communication is presented in detail. Extensive measurements and simulations ascertain the proposed 28 GHz antenna solution to be highly effective for cellular handsets operating in realistic propagating environments.
A low-cost silicon-based high efficiency CMOS-LDMOS switch-mode power amplifier (SMPA) line-up operating for sub-1GHz application is presented. The switch-mode operated LDMOS device is driven by high-speed, high voltage driver, implemented in a standard 0.14µm CMOS process technology. The CMOS driver uses high voltage extended-drain devices and delivers a 5.0VPP output voltage swing up to 1GHz. The...
A novel miniaturized broadband circulator for reconfigurable mobile handsets has been successfully developed. The circulator operating in a weak magnetic field below ferromagnetic resonance is derived by analyzing the equivalent circuit. The operating theory of the circulator has been confirmed by using the perturbation theory. The usable isolation band could be expanded to 1.71GHz to 2.17GHz, which...
A 53-to-84 GHz wideband power amplifier (PA) is implemented in 65-nm GP CMOS technology. This PA exhibits a measured small signal gain of 29.1 ± 1.5 dB from 53 to 84 GHz and a Psat of 10.8 dBm, P1dB of 7.2 dBm, power added efficiency (PAE) of 9.7% at 80 GHz at drain voltage of 1.2 V. The DC consumption is 123 mW.
This paper reports the recent development on power coding method of generating a 5-level intermediate frequency PWM-based high speed digital-RF bit train, which is used as the input switching signal for class-S digital RF power amplifiers in the digital transmitter. By introducing the discrete-time power coding process at an IF of around 60 MHz, digital transmitter at cellular bands then becomes feasible...
A novel Envelope Following (EF) method is presented for fast and accurate transient simulation of microwave and RF circuits with almost-periodic responses. Targeted circuits contain high-frequency components whose amplitudes vary slowly. The proposed high-order EF method is based on a stable and high-order Obreshkov formula (ObF). Use of high-order formula allows accurate and fast analysis while keeping...
A high-speed downlink communication system is required to meet various applications for nano/small satellites. The purpose of this research is to develop a high-data-rate X band downlink system with low power consumption. A high efficient RF circuits using GaN-HEMT SSPA and low power consumption digital circuits were important. We developed over 300Mbps with occupied BW150MHz, RF power 2W, power consumption...
Rudolf “Rudy” Henning was born in Germany in 1923 and came to the United States in 1939. He served in the U.S. Army Signal Core under General Patton from 1944–1946. He earned his MS and D. of Eng Sci in electrical engineering. In 1957, Dr. Henning came to Pinellas as Chief Engineer of Sperry Microwave Electronics Division in Oldsmar and USF as Associate Dean of the College of Engineering in 1972....
In this work, a novel procedure for the simulation of magnetically-biased graphene by means of standard simulators, is made available. To this aim, the similarity of graphene with lossy ferrite has been exploited. Simulations can be performed at microwave frequency, from DC up to 100 GHz, where the electromagnetic response of graphene is almost flat. The Duality theorem is applied to establish the...
Microwave research at the UPRM have been focused in weather radar systems, tunable circuits and antennas, antenna characterization and array design, and the analysis of weather radar data. Most recently, the group has been working in the development of a weather radar network for western PR, OTG weather radars, and antennas for Body-Area-Networks. Initial observations from the first radar network...
We experimentally demonstrate a Ka-band downconverting receiver using optical phase modulation and an optical heterodyne process that allows for minimal hardware at the receive antenna. 10 Gb/s wireless data transmission using 16-QAM is demonstrated with photonic upconversion at the transmitter and photonic downconversion at the receiver.
The root cause of the instability is quantitatively identified for an explicit FDTD-based analysis of general lossy problems where both dielectrics and conductors can be lossy and inhomogeneous. Based on the root cause analysis, an efficient algorithm is developed to achieve unconditional stability in an explicit FDTD-based solution of general lossy problems. Numerical experiments have demonstrated...
In this paper, a multi-port RFID tag antenna is integrated with an I2C-RFID chip along with a microcontroller unit (MCU) and a sensor to implement a low-cost wireless temperature sensor using a commercial RFID reader. The key feature of this design is a two-port patch antenna with energy-harvesting circuitry at its second port, which can acquire the supply voltage needed for the operation of RFID...
Waveform sharpening in nonlinear transmission lines (NLTL) is analyzed in detail and applied to the design of a pulse-generator based on two coupled oscillators. The maximum propagation frequency through the NLTL is calculated with a realistic numerical technique, which enables an optimized design. By coupling two NLTL oscillators terminated in grounded stubs of different length, three design parameters...
An experimental VHF DC/DC converter aimed at envelope-tracking amplifiers for space applications is presented. Based on Gallium Nitride components, it is capable of operating in the range of tens of watts, as required by on-board transmitters. When driven by a 50-MHz PWM signal, it reaches a peak efficiency of 91.6%. A detailed breakdown of the associated losses is reported in order to identify the...
This paper presents high responsivity plasmonic terahertz (THz) power detectors operating at 0.3 THz. The detectors are implemented using 130 nm depletion mode InGaAs/GaAs pseudomorphic High Electron Mobility Transistors (pHEMT) with on chip patch and dipole antennas connected to the gate terminal. The measured absolute responsivity at room temperature is 7V/W, while the normalized responsivity with...
Analytical models of proximity and skin effects have been developed in this paper to calculate and predict the frequency dependent resistance, Re(Zin) and quality factor, Q for mm-wave inductor design. The derived models incorporate layout and material parameters, and frequency in an explicit form suitable for circuit simulation. The accuracy has been proven by a close match with Re(Zin) and Q measured...
Here in this paper we propose an approach to investigate the coupling mechanism of different RF coil elements based on characteristic mode analysis. The coil element with lumped-element-connection to the shielding plate focuses the magnetic field below the strip-line due to a loop current from the dominant mode. Denoted by a negative characteristic mode eigenvalue, the coil element without direct...
This paper presents a new radio-over-fiber system that uses an all-digital transmitter architecture enabling a very simple remote radio head comprised only by an amplifying stage, a bandpass filter and an antenna. An all-digital transmitter is proposed to implement a flexible centralized digital radio, able to perform the baseband processing and transmission of radio signals at radio frequencies (RF)...
We present a semi-analytical model for dense vias in an infinite parallel-plate environment with a shared-antipad configuration. The network parameters are estimated based on reciprocity. The field from the reciprocal source is highly localized, making the mode matching computation converge very fast. In addition, the near field can be expressed in a closed-form, making the method computationally...
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