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In this study, we propose a very simple and easy-to-fabricate transition from a low loss ground coplanar waveguide (GCPW) with sidewalls to rectangular waveguide. It consists of two steps of transition, one from an ordinary CPW to GCPW with side walls, and the other from GCPW to rectangular waveguide. Since the design is very simple and the features are aligned with the Cartesian coordinates, it highly...
Dielectric covered antennas have been extensible used in microwaves. They are usually designed with dielectric quarter wavelength super-layers or with frequency selective surfaces. The main drawback of these antennas is that their BW is inversely proportional to the directivity. The new geometry proposed here makes use of a silicon lens instead of dielectric super-layer. In this case, the directivity...
Presented in this paper is the experimental quantification of the temperature uncertainty in a MEMS thermally-tunable capacitor that is especially suited for harsh-environment applications. The measured temperature uncertainty is less than 0.64degC at each point tested, and less than 3.10% for the entire operating range. This recorded resolution is limited by the capacitance resolution of the employed...
An ultra-wideband (UWB) bow-tie antenna integrated with a balun was fabricated for breast cancer detection. The bandwidth and the center frequency of the antenna were 2.4 GHz and 4 GHz, respectively. A target which was located at the depth of 44 mm in a dielectric material was detected by confocal algorism.
The wireless interconnection has attracted much attention recently as an alternative to the conventional wired interconnection in the ultra large scale integration (ULSI) technology. In this paper, a wireless interconnection operating at 25 GHz, which utilizes novel antenna in the form of a tapered slot structure, is described. The design takes into account an environment similar to the one used in...
Based on the structure of CRLH-TL, a novel phase shifter with high power capacity is proposed. In this structure, switches are mounted on the fingers of CRLH-TL, thus the current through a single switch is only a fraction of that through the whole phase shifter, which greatly improves the power capacity. Moreover, the present phase shifter possesses other advantages such as low cost, small size and...
In this paper, we consider the design of an integrated 60 GHz array using a hybrid silicon-polymer material system. A PTFE (Teflon) printed square array is proposed and analyzed. A discussion of related microfabrication challenges is also presented, along with some processes to overcome these challenges. Finally, the topic of silicon- polymer integration is addressed.
In this paper, a very low loss CPW structure for application in submillimeter wave region is proposed and an optimized solution in terms of loss and dispersion is obtained. In this new structure, substrate is removed totally, which allows a pure TEM wave propagation. Furthermore, using the side walls in the structure, there are no higher order substrate mode excitations. The only remaining source...
Wireless interconnects have been proposed to solve the traditional metal line interconnects problem caused by the continuous downscaling of dimensions in CMOS technology. Many recent researches have focused on device designs and integrated antennas for wireless interconnect applications. However, aside from previous work, the basic propagation mechanisms on integrated chip structures have not been...
A novel CRLH cell is hereby presented providing easy integration and reconfigurability. First, the straight access line to the interdigital-capacitor was replaced by a bent access to improve the propagation without using cumbersome tapered access. Second, a stub-capacitor was added to facilitate the reconfigurability providing added degree of freedom for the values of the circuit model. These modifications...
A new highly sensitive radio frequency pressure transducer has been designed to operate in the millimeter wave frequency range that can be seamlessly integrated with other RF circuits in the LTCC multilayer packaging technology. The resonator consists of a stacked-patch based on LTCC multilayer packaging technology, having an air cavity embedded by a silicon (Si) diaphragm that deflects due to pressure...
The performance of a vertical-type loop antenna made by two asymmetrical wire bonds on a low-resistivity silicon substrate was investigated. The large-loop height was increased from 0 to 0.3 lambdao, and the peak gain and radiation efficiency were observed after numerically removing the feed-line loss of 4 dB/mm at 50 GHz. When the loop height was increased from 0 to 0.2 lambdao, the radiation efficiency...
Parabolic wave equation (PWE) algorithms are widely used to model electromagnetic wave propagation in diverse environments. In most applications only the amplitude of received field is of interest, but the computed fields also contain phase information, which can subsequently be used for evaluating the effectiveness of angle-of-arrival (AOA) algorithms. In this paper, we use the chirp Z-transform,...
In this work we will present the fabrication process and preliminary experimental results of a MEMS steerable broadband antenna. The antenna is designed to fit on a 1cm x 1cm silicon platform with a thin benzocyclobutene (BCB) dielectric coating and operate between 4-9GHz. The modified Fourpoint antenna is simulated using ANSOFT High Frequency Structure Simulator (HFSS) and has a return loss of less...
In this paper, the versatility and usefulness of convex optimization is illustrated. A sidelobe-minimizing weighting method will be presented that returns optimal weights given a set of specifications, including: scan direction, beamwidth, array geometry, set of null constraints and smoothness criteria. The method also takes into account the radiation patterns of the elements, which do not have to...
A beam reconfigurable antenna based on folded dipole structure has been presented. The antenna can switch beams without the input impedance variation. The front-to-back ratio is measured as approximately 7dB. To implement the antenna, a bi-stable leaf spring MEMS switch is considered.
One of the key steps in the Method of Moments (MoM) is the computation of the Green's functions needed to fill the impedance matrix. When the object is located in a stratified medium, the corresponding spatial domain Green's functions are expressed by some Sommerfeld Integrals (SI's). The numerical evaluation of SI is extremely time consuming because of the oscillating and slowly decaying nature of...
In this paper, we have developed a hybrid VGFEM-BI formulation for the analysis of scattering from filled cavities. Since surface basis functions are not supported in the framework of VGFEM, volumetric vector basis functions are forced to impose boundary conditions at the aperture. This is achieved by constructing conformal PU domains from the geometry mesh. The method has been validated by comparing...
We have explained the effect of the silicon substrate on the off-chip radiation of an integrated antenna on chip. From this consideration a low-cost approach for an enhanced antenna-on-chip design has been derived and its improved radiation efficiency has been confirmed by measurements.
A dual slot antenna integrated with zero bias Sb-heterostructure diode for direct detection of THz radiation is presented. The compact layout and high responsivity of the detector makes it suitable to design 2D focal plane THz imaging arrays. Further, we proposed and demonstrated that number of detectors supported by a fixed size silicon lens can significantly be increased by proper antenna modifications...
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