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Scan Element Pattern, SEP, (formerly active element pattern1) was developed circa 1960 by Allen [1], Oliner [2], Hannan [3], Stark [4], and others, to provide phased array gain behavior versus scan angles. It's utility for decades has been to give insight and results on the scan performance of various elements and lattices. A common measurement procedure terminates all elements in the array, with...
This paper presents an initial step toward high-bandwidth electroquasistatic (EQS) imaging. This system uses a capacitively-coupled electrode array excited at high frequencies in order to distinguish various features such as a dielectric layer or a variable air gap. Further, this system can potentially image depth information and dielectric composition by using multi-wavelength electrode arrays. This...
We are developing a capsule ultrasound (CUS) device - a pill with the capability to scan the gastrointestinal (GI) tract through ultrasound. In this paper, we discuss the design and fabrication of the main components of the CUS device including the CMUT array, front-end electronics, and the wireless transmitter. We demonstrate a successfully fabricated 128-element CMUT array with polydimethylsiloxane...
A space-time array difference magnetotelluric method is proposed in order to suppress the correlated noise and obtain reliable plane wave impedance data in strong interference region. First, we established a model of electromagnetic prospecting system with multi-input and multi-output. Both natural and man-made electromagnetic field is considered to incidence to earth simultaneously, constitute a...
In this paper we provide a method that can be used to analyze power distribution networks with electromagnetic accuracy. The method is applicable to any power distribution network in the chip, package or printed circuit board (PCB). The method can also be used to compute the interaction of the power distribution network between various domains. We provide examples to validate this approach.
We propose a package tiling method for reducing the impedance of a power distribution network (PDN). The PDNs of two packages are directly connected by edge plating, rather than being connected through a board. Experimental results show that the proposed idea greatly reduces the loop impedance.
A bilaminate three element array of transducer has been designed and fabricated with corona poled polyvinylidene fluoride (PVF2) using a printed circuit board (PCB) backing. The results obtained with this array show a flat frequency response over a wide bandwidth, short pulse width and adequate sensitivity for possible application in medical imaging.
We developed a flexible and penetrating microelecrode arrays (FPMA) and interconnection cables for neuronal signal recording. For successful implantation of FPMAs into various locations of the nervous system, FPMAs in different dimensions were fabricated using established fabrication process protocols in previous studies. Also, the interconnection cables based on parylene-C were designed and fabricated...
For high and ultrahigh field MRI applications, parallel imaging that employs multi-channel RF coil arrays has been developed in order to reduce data acquisition time and to manipulate the Bi distribution by enabling RF shimming. However, implementing parallel imaging or parallel excitation still is considered a significant challenge in terms of high electromagnetic coupling among closely placed resonant...
This paper describes the manufacturing and evaluation of a PMN-PT 1–3 composite based phased array ultrasonic probe for nondestructive evaluation (NDE). The electromechanical parameters of PMN-PT based 1–3 composites were measured and the composites were directly used in the acoustic stack manufacturing process (matching layer, etc.) similar to conventional PZT based probes. The performance of the...
A novel fabrication process for CNT micro-electrode arrays (MEA) integrated on stretchable Polydimethylsiloxane (PDMS) membranes is presented. The new process flow overcomes the problems encountered in previous reports. In the process flow presented in this paper, Carbon nanotubes (CNT) electrodes are embedded on the backside of a freestanding membrane using a novel fabrication technique. This upside-down...
We are presenting the design of a high gain printed antenna array consisting of 420 identical patch antennas intended for FMCW radar at Ku band. The array exhibits 3 dB-beamwidths of 2° and 10° in H and E plane, respectively, side lobe suppression better than 20 dB, gain about 30 dBi and VSWR less than 2 in the frequency range 17.1 – 17.6 GHz. Excellent antenna efficiency that is between 60 and 70...
The paper investigates the feeding structures for printed antenna arrays with parallel reflector and their influences on antenna parameters. Two printed antenna arrays are presented. The first consists of ten series fed symmetrical dipoles with tapered impedances. The second is the array of eight symmetrical dipoles that are fed by a tapered distribution. The feeding structures for both antennas are...
Two multiple-antenna-port and multiple-user-port antenna tuners are studied and compared. The first one is made up of independent and uncoupled single-antenna-port and single-user-port antenna tuners, each having the structure of a π-network. The second one is new. It cannot be separated into independent and uncoupled antenna tuners and it has the structure of a multidimensional π-network. It is shown...
This paper presents a new excitation scheme producing dual circular polarization in a class of Dielectric Resonator Antennas characterized by their high profile. The excitation uses a sequential feeding, which produces high quality dual circular polarization over a wide range of angles and results in a polarization bandwidth of 20% to 30% in the Ku-Band. A similar impedance bandwidth can be achieved...
A linear three-element slot antenna array with intentionally strong mutual coupling between the elements, a so-called connected array, is presented. By simultaneously feeding all three ports of the array, at different frequencies over an octave bandwidth and with different phases, feed-port reflection coefficients with magnitude larger than one, or negative active feed impedances, can occur. A reactive...
The research paper covered the 3 by 3 odd orientation array antenna (OOAA) design and fabrication by using Leucaena leucochephala bio-composite substrate material. The objective of the paper was to utilize and design off centered orientation feed array antenna with circular BalUn and dual matching stub to control the impedance mismatch issue onto the bio-composite substrate with the mixture of 70%...
This paper presents a fast and efficient procedure for pre-designing circumferential arrays of cylindrical hybrid microstrip antennas. Simulated radiation patterns and input impedance are in good agreement with experimental results.
In this paper a design for a broadband, light weight and low cost smart shield frequency selective device is proposed. The device consists of a dual layer printed circuit board patch array and is capable of absorbing WLAN signals in the frequency range around 5.5 GHz, whilst allowing almost unitary transmission outside this range, for example the GSM frequency band ranging from 0.8 to 2.1 GHz. Therefore...
The aim of this study is to establish an efficient analysis method for reflectarrays with varying element sizes. The efficiency of the method relies on utilization of characteristic modes as macro basis functions, and thereby reducing the MoM matrix equation size dramatically. Although the reflectarrays on the focus of this study are comprised of differently sized elements, it was observed that, when...
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