This work presents a monolithic DC~4GHz 6-bit digital attenuator with low insertion phase shift and attenuation error. Based on GaAs E/D pHEMT process, a serial-to-parallel converter is introduced to decrease the control pads of the chip. In the 16dB attenuation bit, a switched-path-type topology is employed in order to extend the bandwidth and achieve low insertion phase shift. The attenuator ...

This paper signifies a very basic design and simulation techniques of RF MEMS switches using the advanced design systems software tool (ADS).Micro electro mechanical systems are recent development technologies which has better characteristics performance and also operating at microwave range of frequencies. Fundamentally MEMS switches can be categorized into two types series switches (ohmic typ...

This paper presents new Wide Bandpass Filter (WBPF) and Narrow Bandstop Filter (NBSF) incorporating two microstrip resonators, each resonator is based on 2nd iteration of Hilbert fractal geometry. The type of filter as pass or reject band has been adjusted by coupling gap parameter (d) between Hilbert resonators using a substrate with a dielectric constant of 10.8 and a thickness of 1.27 mm. Nu...

PURPOSE To compare a new insertion method using an EndoGlide (Angiotech/Network Medical Products) with the standard Busin glide (Moria USA) assisted insertion of the posterior lamellar corneal graft in Descemet stripping endothelial keratoplasty (DSEK). DESIGN Prospective, consecutive, comparative, nonrandomized study. METHODS Surgery was performed between October 2008 and October 2010 in 5...

RSPUDT filters based on different width split fingers for IF applications have been developed. Such filters provide improvement of insertion loss comparing to DART-RSPUDT filters. A new optimization procedure for RSPUDT filter design has been proposed, based on the adjustment of RSPUDT through a synthesis grid of narrow structure elements. The width of these elements is equal to or smaller than...

This paper presents a new combination of PIN diode switch for low insertion loss and high isolation. The combination is designed for frequency 0.1 to 10 GHz. In new combination we connect the two series-shunt combination one is across the input port and the other one is across the output port with one shunt diode connect between two λ/4 micro strip line. It has been concluded that in new combin...

This paper demonstrates the design of high-isolation millimeter-wave monolithic integrated switches using MOCVD-grown InGaAs/InP PIN diodes as switching devices. W-band single-pole single-throw switch using double shunt diode topology allowed significant improvement of isolation while keeping insertion loss low. The SPST switch used two InGaAs PIN diodes and demonstrated better than 35dB isolat...

Clinical specular microscopy has indicated that human cell healing occurs by spreading, there is a limited healing reserve, and premature cell loss is the equivalent of a "premature aging" that may lead to later decompensation. This instrument has been useful in studying healing and cell damage from surgery, drugs, and special procedures such as intraocular lens insertion. It pointed out extens...

Percutaneous screw insertion for minimally displaced or reducible acetabular fracture using x-ray fluoroscopy and computer-assisted navigation system has been advocated by some authors. The purpose of this study was to compare intraoperative conditions and clinical results between isocentric C-arm 3-dimensional (Iso-C 3D) fluoroscopy and conventional fluoroscopy for percutaneous retrograde scre...

OBJECTIVE We describe the clinical results of mandibular augmentation with coronoid process bone grafts for dental implant insertion. STUDY DESIGN Fifteen patients with vertical and transverse defects of the posterior alveolar process of the mandible were treated. All patients underwent mandibular rehabilitation with autogenous coronoid process bone grafts via minimal-access surgery. After 6 ...