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This paper presents a new communication concept for the passive UHF RFID technology, by means of the exploitation of harmonics signals generated by passive UHF RFID chips. The presence of information carried on the harmonics is experimentally shown by conducted measurements on three different EPC Class-1 Gen2 RFID chips. Therefore, and in compliance with the standard requirements, these results are...
In the Finite Difference Time Domain (FDTD) method, the time-step is constrained by the Courant-Friedrichs-Lewy (CFL) limit. The CFL limit is particularly restrictive in the presence of fine geometrical details, since it imposes a very small time-step. We propose an efficient method for overcoming this constraint via model order reduction, coupled with an eigenvalue perturbation method that ensures...
A millimeter-wave bandpass filter (BPF) using complementary split-ring resonator (CSRR) loaded quarter-mode substrate integrated waveguide (QMSIW) cavities is presented in this work. The CSRR-loaded QMSIW cavity resonates below the original QMSIW resonance frequency, which further reduces the size with respect to its SIW counterpart. The reduced quality factor Q of the cavity makes it useful for BPFs...
A single-chip 45 GHz power amplifier implemented in 45nm CMOS SOI is described, which feeds its RF output power to a 2×2 antenna array on an accompanying printed circuit board. The chip results in a maximum RF output power of 28 dBm (630 mW), and the system achieves a peak equivalent isotropic radiated power (EIRP) of 10 Watts (for a 2×2 antenna gain of 12 dB). The power amplifier is composed of 4...
A six port mixer based 20GHz nonlinear vector network analyzer (NVNA) dedicated to the characterization of radar power amplifier driven by non periodic pulsed signal is proposed. For the first time a mixer based NVNA is able to measure the fundamental and two harmonics simultaneously while using non periodic radar pulse train allowing measuring time domain waveforms and pulse to pulse measurement...
A fully integrated Ku-band down-converter front-end for digital broadcast satellite (DBS) receiver in a 0.18 µm SiGe BiCMOS technology is presented. To meet the specifications in different areas, the circuit can cover a wide RF range (10.7–13.45 GHz) with four LO frequencies, and down convert the RF signal to L-Band (950–2150 MHz). Compared with previous works, the presented down-converter using a...
A fully printable 60 GHz chipless RFID tag provides high data capacity. The printed tag consists of an array of 45° inclined conductive microstrips that act as perfect electromagnetic (EM) polarizers. When illuminated with a linearly polarized signal, the tag's backscattered cross - radar cross section (RCS) response is much larger than its co-RCS. The tag can encode up to 50 bits of binary data in...
This paper presents a new measurement system based on heterodyne receiver to characterize the impact of irregular pulsed signals on the pulse-to-pulse (P2P) stability of microwave power amplifiers. The aim of this work is to provide a way of identifying the key design parameters and specifications of power amplifiers, such as thermal management, which have a critical impact on P2P stability. This...
This paper presents a fully integrated CMOS power amplifier (PA) with a dynamic feedback and gate biasing. The two dynamic circuits improve the linearity and efficiency of the stand-alone PA and ET PA. The proposed CMOS ET PA including the dynamic control circuits is fabricated using 0.18-μm CMOS process. For a long-term evolution (LTE) signal at 1.85 GHz with a 10-MHz bandwidth and a 16-QAM 7.5 dB...
This paper presents a prototype of a V band multiple-beam phased array, which is to be used on a GEO satellite as receiving antenna for GEO-LEO inter-satellite links. This antenna is capable of radiating four independent scan beams to support simultaneous data links between the GEO platform and four LEO satellites. Relevant measures have been introduced to reduce gross weight and power consumption...
This paper presents a memory of the author's interaction with Professor Arthur A. Oliner in regard to hidden phenomena of leakage from certain dielectric waveguide structures. These phenomena are very mild so that they can be revealed only by his insight backed by a rigorous analysis and physical understanding of guided waves. He found mistakes in the author's work but it is not fatal. However, this...
In this paper, a 220–235 GHz single-stage power amplifier (PA) MMIC is presented. The amplifier uses 250 nm InP hetero-junction bipolar transistors (HBTs) and benzocyclobutene (BCB) thin-film microstrip technology. Two levels of power combining were used on-chip to achieve total emitter area of 12 μm2. The first level is a two emitter finger HBT with each finger having emitter area of 0.25×6 μm2....
The characteristics of a Wilkinson power divider frequently degrade when an isolation resistor in the Wilkinson power divider is formed by a resistance film because the resistance changes caused by manufacturing errors. In this paper, we present a stripline power divider that is insensitive to resistance variations, using a parallel resistor pair. In the proposed divider, two parallel resistors connected...
A vertically-integrated, fully inkjet-printed microwave structure is demonstrated for the first time, where both the metallic elements and the platform substrate are completely fabricated with the additive inkjet printing process. The surface uniformity of SU-8 polymer ink is outlined as a function of layer deposition to provide a desirable profile for a thick RF substrate application. Inkjet-printed...
A liquid-metal reconfigurable log-periodic balun is presented. The design consists of three sections that can be independently actuated with pressure-driven liquid metal, resulting in a planar balun that is capable of switching between three continuous bands from 1.89 to 8.45 GHz. The two output ports have a magnitude balance within 1 dB and a phase difference within 10° of 180°.
In this paper, two broadband Wilkinson power dividers in microstrip technology are presented. A broadband operation from 2 to 28 GHz could be achieved by a multisectional layout. The dividers differ in the number of cascaded steps, which allows application dependent usage. Furthermore, the dividers make use of commercially available, surface mounted thinfilm-resistors, allowing a straightforward implementation...
A power-harvesting prototype made of a compact antenna and an optimized RF-DC converter circuit is designed to convert the wireless signal given by a 2-way radio into usable DC power at which many low power electronics and displays used in sensors and smart meters can operate. Measurements show electronics up to 13V can be easily powered by holding the harvester 5 inches away from the radio. A capacitive...
In this paper, aerosol jet printing technology is assessed for D-band RF applications for the first time. It describes the fabrication process, the technology assessment and the characterization of coplanar waveguides (CPW) lines and CPW to microstrip transitions on liquid crystal polymer (LCP) in the D band using silver nanoparticle aerosol jet printing process. Feature sizes with a resolution of...
A millimeter-wave power amplifier (PA) implemented in a commercial 45nm CMOS SOI technology is presented. The PA design is based on stacking of two dynamically-biased Cascode transistor cells where drain-source voltages of individual transistors are added constructively to increase the output power. The PA output impedance is the sum of the output impedances of the two Cascode cells and is optimized...
In this work, a wide bandwidth Sequential Power Amplifier (SPA) is demonstrated for the first time. Using wideband and high efficiency 10W and 45W amplifiers, an SPA is described, capable of delivering high efficiency at back-off without the bandwidth limitations of the traditional Doherty PA. Measurement results of the implemented amplifier are presented, with an average back-off drain efficiency...
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