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This paper presents a small size 60 GHz Antenna-on-Chip (AoC) designed and fabricated using 0.18 um TSMC Complementary Metal Oxide Semiconductor (CMOS) process. AoC performance is enhanced using asymmetric Artificial Magnetic Conductor (AMC). The AoC area including the AMC is 1715 um by 710 um. As AMC shields AoC from the lossy CMOS substrate, simulated gain of −0.25 dBi is achieved at 60 GHz for...
A 60-GHz CMOS on-chip dipole antenna with efficiency-enhancement technique is presented. A helium-3 ion irradiation process is used to reduce the substrate losses of the on-chip antenna. The radiation efficiency of the antenna is doubled using the ion implantation technique. The antenna is fabricated in a 65-nm CMOS technology with a core area of 0.48 mm2. The on-chip antenna achieves a peak gain...
A novel design of millimeter-wave antennas integrated with a high-impedance surface (HIS) reflector is presented within the particular context of 3D heterogeneous integration on silicon interposer an its specific requirements. Then, the design steps of a 60-GHz folded dipole antenna for short-range communications are detailed. Simulation and measurement results show promising performances in terms...
We present in this paper an electromagnetic model based on finite elements method for the characterization of dielectric samples with a near field microwave microscopy, this proposed model is a useful tool to determine for, a given microcopy probe, the minimum substrate thickness required to extract accurately the substrate relative permittivity and loss tangent. This paper proposes a practical application...
The method of the split cylinder resonator cavity (SCR) is used to characterize accurately and simultaneously in one temperature cycle, dimensional and electrical characteristics of the cavity and the electromagnetic properties of a dielectric material. To do this several modes are used, some to control the cavity and others to control the sample.
An accurate characterization of microwave materials is essential for reliable high frequency circuit design. This paper presents a measurement setup, which enables a quick and accurate determination of the relative permittivity of dielectric bulk materials up to 110 GHz. A ring-resonator is manufactured on a well characterized substrate dealing as reference resonator. The Material Under Test (MUT)...
This paper investigates the use of a cylindrical microwave cavity resonator to measure the complex permeability of mixtures of magnetite (Fe3O4) and silicon dioxide (SiO2) using different field orientations. The weight percentages of the mixtures are varied and the effective bulk permeability is measured at frequencies from 3.8GHz to 10.16GHz using the TM110 and TE0np modes. The calculated permeability...
In this paper RCS measurements of traffic signs, a sign pole and a guide post for different viewing angles are presented. The signs show strongly angle dependent reflection characteristics and several sources of reflections. Furthermore, the effects of these characteristics relevant for a vehicle approaching a traffic sign are regarded. These considerations constitute a basis for using such traffic...
Nowadays, the increased use of smartphones, laptops and tablets, has led to an exponential increment of mobile data services in high speed mobility scenarios. Under this scope, the 3GPP working group for LTE standardization, is paying more attention to communication in railways environments. This standardization group is promoting the usage of mobile relay nodes for improving performance in high speed...
Due to dramatic increase in power demand for future mobile networks (LTE/4G, 5G), hybrid- (solar-/wind-/fuel-) powered base station has become an effective solution to reduce fossil fuel consumption. Such base stations are powered by small wind turbines (SWT) having nominal power in the range of 1.5–7.5 kW. In the context of the OPERA-Net2 European project, the study aims to quantify and possibly...
Cooperative spectrum sensing in cognitive radio (CR) avoids hidden terminal problems common to network architectures with central sensing nodes. It also lowers the requirements for the sensing radio front-ends. This paper presents a multi-chip module RF front-end implemented from custom RFICs realized in an 0.25 µm SiGe BiCMOS technology. Using an up/down-conversion heterodyne architecture, the front-end...
The demand for a software-defined radio (SDR) is increasing because it can support variety of frequency bands and modulation techniques. However, a condition of an antenna can become a bottleneck of the communication system using SDR due to less flexibility of the antenna. For example, when the SDR changes the signal frequency dynamically or the communication system faces a disturbance such as human...
The localization of structural anomalies in timber structures by a robust, reliable and an user friendly system are the objects of this research activity. In this contribution, authors present some results of the activity and they highlight the potentiality of this technique and its applications. The potentiality of the system as diagnostic tool based on non-destructive techniques are certainly useful...
In this paper a microwave permittivity sensing system based on a super-heterodyne reflectometer is presented. A set of two high directivity directional couplers is utilized for the derivation of a reference and a reflection measurement channel from a 14 –18 GHz stimulus. Integrated Gilbert-cell circuits were fabricated in a SiGe HBT technology and act as frequency converters for the high frequency...
This work addresses the dielectric characterization of polyvinyl-alcohol (PVA) in humidity sensing applications. The PVA film is characterized in relative humidity (RH) range from 12% to 94% over a frequency span from 1 GHz to 10 GHz, and its suitability for RH sensing is verified with a sensor prototype by implementing a resonator. The characterization results of the PVA film are applied to simulate...
We present in this paper a new passive ceramic corrosion sensor which can be integrated into a structure submitted to a corrosive environment. The corrosion detection mechanism is based on the modification of a resonator frequency as a function of the corrosion level. An alumina substrate is covered with a metal enclosure that is protected against corrosion apart from the middle of the top face. This...
This paper presents a fast responding frequency measurement system based on Six-Port technology being able to determine precisely the frequency of very short time domain pulses of one microsecond and even less in the 2.4 GHz ISM band. By using a delay line the frequency measurement can be reduced to a phase measurement that can be quickly evaluated by the Six-Port network implemented with lumped components...
An original solution for the realization of pseudoelliptic evanescent mode filters with extreme close-in rejection is presented in this paper. The basic idea consists of using high-Q bypassed TE201 mode cavities embedded within two or more evanescent mode resonators. Such a combination of resonators allows the generation of extremely close transmission zeros while realizing at the same time relatively...
This paper presents a novel geometry for the realization of compact dual-band waveguide filters. It is based on TM dual-mode cavities that allow for asymmetric filtering functions with N transmission poles and N transmission zeros. In contrast to previous works, that are limited to structures with a single passband, here the TM cavity geometry is used to generate one pole in each passband and two...
This paper presents a novel filter topology for the implementation of asymmetric responses with transmission zeros (TZs) in rectangular waveguide technology. It is based on a compact folded E-plane arrangement where adjacent resonators are capacitively coupled through rectangular slots, and non-adjacent resonators are coupled through simple inductive windows. The new folded configuration allows the...
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