In this work, the design and fabrication process of a stripline 90 degree hybrid coupler using LTCC technology are presented. The main specifications required for the device developed were 1.03 GHz central operation frequency, isolation higher than 23dB and a maximum size of 15 mm x 10 mm. To obtain a starting point of physical parameters for the simplified DC configuration a transmission lines...

Motivation: As the human genome project progresses and some microbial and eukaryotic genomes are recognized, numerous biotechnological processes have attracted increasing number of biologists, bioengineers and computer scientists recently. Biotechnological processes profoundly involve production and analysis of highthroughput experimental data. Numerous sequence libraries of DNA and protein str...

In this paper, we present a novel web-based computer-aided modeling and manufacturing software tool for spherical mechanisms. Our purpose is to facilitate the analysis, dynamic simulation, and manufacture of one degree of freedom spherical four-bar mechanisms. First, a brief review of some of the current computer-aided design software for spherical four-bar mechanisms is presented. These softwa...

BACKGROUND The design of foot and ankle orthoses is currently limited by the methods used to fabricate the devices, particularly in terms of geometric freedom and potential to include innovative new features. Additive manufacturing (AM) technologies, where objects are constructed via a series of sub-millimetre layers of a substrate material, may present the opportunity to overcome these limitat...

The undergraduate electrical engineering curriculum at Embry-Riddle Aeronautical University includes a three-course sequence in electromagnetism, radio frequency systems, and the RF laboratory (taken concurrently with the RF class). These courses are designed to support novice students in attaining the final learning objective of the RF Lab: the design and understanding of a simple digital radi...

OBJECTIVES To design, manufacture and analyze custom implants with functional gradation in macrostructure for attachment of amputation prostheses. METHODS The external shape of the implant was designed by extracting geometrical data of canine cadavers from computed tomography (CT) scans to suit the bone cavity. Three generations of implant designs were developed and were optimized with the he...

ractures to the bones of the facial skeleton are common njuries sustained in contact sports.1 For professionals, the rolonged recovery from such a bony injury may have both nancial and psychological consequences. Facial splints, asks,2 or shields3 have previously been reported as adjuncts hat provide protection to the bony prominences of the face nd may allow a more speedy return to the field o...

Since its founding, NASA has been dedicated to the advancement of aeronautics and space science. The NASA Scientific and Technical Information (STI) Program Office plays a key part in helping NASA maintain this important role. The NASA STI Program Office is operated by Langley Research Center, the lead center for NASA's scientific and technical information. The NASA STI Program Office provides ...