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Array processing, such as micro structure punching, wire bonding of LED array or integrated circuit, laser drilling, is widely used in electronic/optics manufacturing. In the processing, high speed positioning can cause strong excitation on the machine structure, which results in severe structure vibration and long settling time. Especially in multiple target positioning process, vibration exists...
This paper proposes transmission control materials consisting of negative permittivity and high permittivity materials. As the high permittivity material, permalloy composite material and dipole array sheet were used, and as the negative permittivity material, wire grid was used here. The transmission characteristics of the proposed laminated structure are evaluated by conventional transmission line...
In this study, technques of cross-polarization suppression for the coplanar waveguide (CPW)-fed monopole antenna with an asymmetric ground plane have been presented. By appropriately etching a notch and embedding a four-slot array in the ground plane, the horizontal current component of the ground plane can be efficiently decreased, thus suppressing the cross-polarized radiation at the broadside direction...
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 complementary frequency selective surface (CFSS) is formed by placing an array of slots in close proximity to an array of its Babinet's complement i.e. dipoles. In this paper by adding an additional layer of periodic elements (dipoles/slots) to a CFSS metasurface the coupling among the arrays is increased thus causing a decrease in the resonant frequency of this proposed structure. The decrease...
In this study we extend our work on low-power CMUT chemical sensors from a single element to an array as a way to improve selectivity to volatile organic compound (VOC) analytes. A single channel of our sensor array comprises of a polymer-functionalized CMUT resonator in the feedback loop of a Colpitts oscillator, which consumes 0.76 mW, when operated continuously. Using our anodic-bonding based fabrication...
In this paper, we present a compact broadside superdirective antenna array based on a planar parasitic superdirective unit-element. The array is designed for 905MHz frequency band, its dimensions are 200 × 54 × 24mm3 (0.6λ × 0.16λ × 0.07λ), and it presents a directivity of 9.2dBi and radiation efficiency of 8.3%. Integrating the initial parasitic array in a PCB of 110 × 70mm2, the array total dimensions...
One outstanding feature of a conformai array or periodic surface is its ability to conform to a surface whilst maintaining the operational electromagnetic characteristics. A simple textile Frequency Selective Surface (FSS), fabricated using weaving technique has been evaluated in terms of its transmission properties on a flat surface and curved structure. Measurements confirm the FSS exhibits resonant...
High-speed vertical-cavity surface-emitting lasers (VCSELs) are important for optical data transmission applications. Modulation bandwidth for free-running VCSELs typically ranges from few to twenty GHz. An interesting discovery is that modulation bandwidth may be appreciably improved with coherently coupled arrays [1,2]. Recently we reported the ability to tune 2–1 phased, photonic crystal VCSEL...
Recently, the development of composite right / left-handed transmission lines (CRLHTLs) has received considerable attention due to the unique propagation characteristics. Because of this increase in applications, CRLHTLs are being implemented in RF systems with other printed circuitry, such as microstrip antennas. In this paper, harmonics resonance frequency of different embedded CRLH-TL array has...
In this paper, a design of a compact projector and hydrophone array is proposed. The FEM is utilized to simulate the performance of the projector and hydrophone, and several design parameters are optimized to achieve higher and flatter sensitivity/TVR response over the working frequency band. The measured performance of the manufactured compact array verifies the validity of the design.
In this paper, a compact electromagnetic bandgap (EBG) structure is presented. In order to achieve the size reduction, additional equivalent capacitance and equivalent inductance are produced in three design steps. The total capacitance and inductance of the proposed structure will be increased much more than the one of the mushroom-like EBG in the literature. Dispersion diagram is presented to show...
Metamaterials represent a new paradigm in electromagnetic science and technology. They have already leaded to many unprecedented microwave applications, which may be classified in three categories: guided-wave, radiated-wave and refracted-wave applications. Control and manipulation of electromagnetic waves is at the heart of many industries from wireless communication, Internet and optical data storage...
The complementary strip-slot element is a broadly-matched microstrip radiator that has been used to design innovative series-fed arrays. It consists of a microstrip series-fed slot that have its complementary stub on the layer of the microstrip and aligned to the slot. In this contribution, the influence of the strip and slot geometry on its performance is studied through the analysis of four different...
The adoption of metamaterials in the development of terahertz (THz) antennas has led to tremendous progresses in the THz field. In this paper, a reconfigurable THz patch antenna based on graphene is presented, whose resonance frequency can be changed depending on the applied voltage. By using an array of split ring resonators (SRR) also made of graphene, both bandwidth and radiation properties are...
In this paper, a detailed characterization of multilayer compact Substrate Integrated Waveguide (SIW) series-series slot coupler is presented. Behavior of coupling slots for a range of tilt angle, frequencies and resonant length are presented. The proposed design principle has been described with the help of the characterization results of the double layered cross coupled SIW slot coupler. An application...
The use of additive manufacturing (AM) techniques for the development of 3D frequency selective structures is discussed. The type of structures introduced use 3D printing to form the shape of the elements which are then coated with conductive paint. Fully and partially metalised array elements are studied. Fully metalised elements offer mechanically robust structures as well as reliability in the...
This paper presents a parasitic three-element superdirective electrically small antenna array based on very small printed loop antenna (unit-element). The unit-element dimensions are 24×20mm2 corresponding to equation relative to its resonance frequency of 900MHz. The array has been designed for an interelement distance of 21.5mm. Its total dimensions are 63×24mm2, and it presents a simulated directivity...
In this paper, the design of a front end array for active antenna applications using metamaterial for usage in the terahertz frequency range is discussed. A brief analysis of the scattering parameters, dispersion curves and radiation patterns is done for composite right/left handed (CRLH) transmission line metamaterials that have a metal-dielectric-metal (MDM) layered configuration as their unit cell...
The design of an antenna using metamaterials (MTM) for usage in the Terahertz frequency range is presented here. A detailed analysis of the ω-β curves, scattering (S) parameters and radiation patterns is done for a Composite Right/Left Handed (CRLH) transmission line metamaterials designed as a metal-metal (MM) waveguide that incorporates an hour glass slot unit cell structure. An array of the same...
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