Abstract: The present invention relates to a reflecting board for a microstrip reflectarray antenna and, more particularly, to a reflecting board with variable slot size that can improve the design flexibilities of the reflecting board and reduce the sensitivity to the manufacturing tolerances of the microstrip reflectarray antenna. The reflecting board comprises a bottom substrate having a first lower surface, and a top substrate. Plural first microstrip antenna patches, and plural second microstrip antenna patches with rectangular slots are disposed on the upper surface and the second lower surface of the top substrate, respectively. The area of the second microstrip antenna patches is larger than that of the first microstrip antenna patches. Besides, the ratio of the maximum border-length of the rectangular slot to the maximum border-length of the corresponding second microstrip antenna patch is identical for each second microstrip antenna on the second lower surface of the top substrate.

Abstract: The present invention relates to a reflecting board for a microstrip reflectarray antenna and, more particularly, to a reflecting board with variable slot size that can improve the design flexibilities of the reflecting board and reduce the sensitivity to the manufacturing tolerances of the microstrip reflectarray antenna. The reflecting board comprises a bottom substrate having a first lower surface, and a top substrate. Plural first microstrip antenna patches, and plural second microstrip antenna patches with rectangular slots are disposed on the upper surface and the second lower surface of the top substrate, respectively. The area of the second microstrip antenna patches is larger than that of the first microstrip antenna patches. Besides, the ratio of the maximum border-length of the rectangular slot to the maximum border-length of the corresponding second microstrip antenna patch is identical for each second microstrip antenna on the second lower surface of the top substrate.

Abstract: The present invention relates to techniques to excite a circularly polarized antenna and, more particularly, to a circularly polarized antenna having a QUAD-EMC unit structure.

Abstract: The present invention discloses a front-wing cantilever for the conductive probe of electrical scanning probe microscopes, wherein two symmetrical front wings are installed to extend from two lateral sides of the front end of the cantilever so that those two front wings are positioned on two lateral sides of the conductive tip. The front-wing structure of the cantilever can effectively inhibit the optical perturbation in the electrical scanning probe microscopes and obviously promote the analysis accuracy thereof. The front-wing structure can provide the scanned region with an effective dark field lest the optical absorption appears in the scanned region of semiconductor specimen and inhibit the optical perturbation occurs during the measurement and analysis of the differential capacitance.

Abstract: The present invention relates to a partially reflective surface antenna and, more particularly, to a partially reflective surface antenna including a reflective board composed of arrays of microstrip antennas, and has advantages of low side lobe and high gain. It comprises: a substrate with an upper surface having a signal transmitting notch for transmitting and receiving a high frequency signal; a reflective board for partially reflecting the high frequency signal; and a plurality of supporting elements for supporting the reflective board on the substrate. The reflective board has a second antenna array and a first antenna array surrounded by the second antenna array, wherein the first and the second antenna array are composed of a plurality of first microstrip reflective units and a plurality of second microstrip reflective units, respectively. Besides, the distance between the first microstrip reflective units is smaller than the distance between the second microstrip reflective units.

Abstract: An electrical scanning probe microscope (SPM) apparatus. The SPM apparatus is equipped with an atomic force microscope with an infrared laser source, a position-sensitive photo-detector (PSPD) to provide a topographic image, a charge-coupled device (CCD) monitor for optical alignment, and an electrical scanning sensor operatively coupled to the atomic force microscope to acquire synchronous two-dimensional electrical images. The photoperturbation effects induced by stray light and perturbation of the contrast of SCM images can thus be ameliorated.

Abstract: The present invention relates to a dual frequency antenna, which integrates a square ring antenna and a patch antenna in order to have a compact circuit area that receives both low and high frequencies, to be used as the antenna of wireless LAN, wherein the wireless LAN is one of the following: IEEE 802.11a, IEEE 802.11b, or IEEE 802.11g.

Abstract: The present invention relates to a microstrip reflective array antenna adopting a plurality of U-slot patches. The microstrip reflective array antenna comprises a reflective disk, a horn antenna and a support. The reflective disk is adapted to reflect microwave signals wherein a plurality of square patches are disposed on the upper surface of a first substrate and a plurality of U-slot patches corresponding to the square patches are disposed on the upper surface of a second substrate. In addition, the lower surface of the first substrate is stacked on the upper surface of a second substrate. The horn antenna is adapted to receive the microwave signals from the reflective disk, and the support is adapted to hold the horn antenna directly above the reflective disk.

Abstract: A method for a terminal to connect to wireless networks in a wireless network system is disclosed. The wireless network system has a plurality of wireless networks, each having a unique identity. The terminal includes a network database for storing a plurality of predetermined identities, a plurality of configuration tables with each associating different predetermined identities to different priorities, and a status pointer representing when or where the terminal operates. The method includes selecting one configuration table according to the status pointer, comparing the identities received by the terminal with the predetermined identities in the selected configuration table, selecting an identity among the matched identities according to the priority associated with the matched predetermined identities, and connecting to the wireless network corresponding to the selected identity.

Abstract: The present invention relates to a screw-feeding device for a screw-driving tool comprising: a housing; a belt carrier is rotatably disposed in the housing and provided on the outer periphery with a plurality of teeth; a motion-transmitting member is disposed in the housing for driving the belt carrier to rotate unidrectionally; a guide rod assembly having a first free engaged with the motion-transmitting member and having a second free end used to rotate the motion-transmitting member; a positioning assembly pivotally is disposed in the housing for positioning the motion-transmitting member. The screw-feeding device is not only capable of feeding the screws precisely into the firing position, but also can hold the screws firmly.

Abstract: The present invention discloses a front-wing cantilever for the conductive probe of electrical scanning probe microscopes, wherein two symmetrical front wings are installed to extend from two lateral sides of the front end of the cantilever so that those two front wings are positioned on two lateral sides of the conductive tip. The front-wing structure of the cantilever can effectively inhibit the optical perturbation in the electrical scanning probe microscopes and obviously promote the analysis accuracy thereof. The front-wing structure can provide the scanned region with an effective dark field lest the optical absorption appears in the scanned region of semiconductor specimen and inhibit the optical perturbation occurs during the measurement and analysis of the differential capacitance.

Abstract: A network system includes a server, an access point connected to the server for transmitting wireless data or receiving wireless data for the server, and a station for receiving wireless data from the access point and transmitting wireless data to the access point. The station has a first key. A ciphering key updating method includes: authenticating the station with the first key; if authentication succeeds, the station transmitting identification data to the access point; and if the identification data matches registration data stored in the server, transmitting a second key to replace or update the first key.

Abstract: The invention relates to an enhanced mechanism for RFID reader which includes: an antenna for receiving a RFID signal transmitted from an object under test and outputting the RFID signal to the RFID reader; a metal plate disposed on an entrance of a building. The metal plate and the object under test are respectively placed on opposite sides of the antenna. The angle between the first metal plate and the second metal plate is from 30 to 180 degrees; therefore the metal plate, the antenna, and the RFID reader provide an enhanced mechanism of a RFID reader.

Abstract: The present invention relates to a microstrip reflective array antenna adopting a plurality of U-slot patches. The microstrip reflective array antenna comprises a reflective disk, a horn antenna and a support. The reflective disk is adapted to reflect microwave signals wherein a plurality of square patches are disposed on the upper surface of a first substrate and a plurality of U-slot patches corresponding to the square patches are disposed on the upper surface of a second substrate. In addition, the lower surface of the first substrate is stacked on the upper surface of a second substrate. The horn antenna is adapted to receive the microwave signals from the reflective disk, and the support is adapted to hold the horn antenna directly above the reflective disk.

Abstract: The invention relates to a circularly polarized array antenna for receiving and transmitting a circularly polarized signal. The circularly polarized array antenna comprises: a plurality of circularly polarized antennas with phase shift mechanism for receiving circularly polarized signals and transmitting the circularly polarized signals; a plurality of power lines which differ from each other in length and are coupled to the circularly polarized antennas respectively; and a power divider coupled to the power lines for receiving the circularly polarized signals. Wherein each of the circularly polarized antennas comprises a plurality of antenna elements and each comprises a microstrip antenna and a slot coupling apparatus.

Abstract: The structure of a screw nailer includes a body with a functional space inside; a rotary driver, placed in the functioning space rotated from a point of support and having a gear wheel that moves the nail belt; a one-way driving component moving the rotary driver in a single direction; an indexing fixer creating elastic positioning when the rotary driver turns in a direction in a preset angle, so that the rotary driver achieves the indexing positioning. A blockage fixer, and by position of the blockage fixer to nail the screw by rotational inertia when the rotary driver of the screw nailer is rotating in direction with preset angle to keep the nail belt from turning the angles, so that the screws may be nailed accurately and securely to the designated location, and largely increase the accuracy, quality and effects of the screw nailer operation.

Abstract: A stacked microstrip reflect array antenna includes a circular disk for reflecting a remote communication signal; an antenna for receiving the communication signal reflected by the circular disk and sending another communication signal to the circular disk to be reflected; and a fixing frame for fixing the antenna on a first plane of the circular disk; wherein the first plane has a plurality of array squares, every array square has a plurality of first array elements and a second array element, the plurality of first array elements are mounted on a top surface of the first plane and the second array element is mounted on a bottom surface of the first plane at a position corresponding to a center of the plurality of first array elements.

Abstract: One aspect of the present invention establishes a session key by a receiving unit R transmitting a plurality of quantities for storage in a public repository. A sending unit S: 1. retrieves the plurality of quantities; and 2. computes and transmits to the unit R a plurality of sender's quantities. The unit R then: 1. computes and transmits to the unit S at least one receiver's quantity; and 2. computes the session key. The unit S, using the receiver's quantity, computes the session key. Another aspect provides a digital signature. Before transmitting a signed message, the unit S stores a plurality of quantities in the public repository. A unit R, that receives the message and the digital signature, verifies their authenticity by: 1. retrieving the quantities from the repository; 2. using the digital signature and the quantities, evaluates expressions in at least two (2) different relationships; and 3. verifies the digital signature upon finding equality between evaluation results.

Abstract: A method of growing single crystal Gallium Nitride on silicon substrate is disclosed including: removing oxide layer of silicon substrate, growing buffer layer of Silicon Carbon Nitride (SiCN), and growing single crystalline Gallium Nitride thin film, characterized in that a buffer layer of SiCN is grown to avoid lattice mismatch which appears when Gallium Nitride is grown directly on silicon substrate, and that Rapid Thermal Chemical Vapor Deposition is adopted to grow SiCN buffer layer, and that Metalorganic Chemical Vapor Deposition is adopted to grow single crystalline GaN thin film.

Abstract: A power-saving method for a station used in a WLAN where an access point sends out a plurality of beacons with a fixed period. When the station receives each fragment from the access point at different time points, it is determined if the station is set to a power saving mode by comparing the time difference of the received fragment and the beacon immediately prior to the fragment with a predetermined time.