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Brian C. Wadell

Bio: Brian C. Wadell is an academic researcher from Teradyne. The author has contributed to research in topics: Automatic test equipment & Device under test. The author has an hindex of 9, co-authored 10 publications receiving 1326 citations.

Papers
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Book
31 May 1991
TL;DR: In this paper, the authors present a comprehensive overview of transmission line components and discontinuities, including coupled lines, capacitors, and resistors, as well as a glossary of special functions.
Abstract: Generalized Transmission Lines. Physical Transmission Lines. Coupled Lines. Transmission Line Components and Discontinuities. Inductors. Capacitors. Resistors. Printed Circuit Fabrication. Cable Dielectrics. Wire Gauges. Special Functions. Glossary. Appendices.

880 citations

Patent
26 Feb 1998
TL;DR: In this article, a radio frequency positioning system is described that determines identity and positional data of numerous objects using a plurality of spread spectrum radio transceivers where at least one transceiver is positioned on each of the numerous objects.
Abstract: A radio frequency positioning system is described that determines identity and positional data of numerous objects. The system includes a plurality of spread spectrum radio transceivers where at least one transceiver is positioned on each of the numerous objects. At least three spread spectrum radio transceivers transmit to and receive signals from the plurality of radio transceivers. A signal processor is coupled to the spread spectrum radio transceivers and determines the identity and the positional data of the objects.

250 citations

Patent
29 Jun 2000
TL;DR: In this article, a performance measurement system consisting of a first player-mounted device and a first field-positioned device is presented, which includes sensors adapted for automatically collecting sensor information from the first player, and a player transceiver adapted to wirelessly transmit and receive information.
Abstract: The invention, in one embodiment, is directed to a performance measurement system comprising a first player-mounted device and a first field-positioned device. The first player-mounted device includes sensors adapted for automatically collecting sensor information from the first player, and a player transceiver adapted to wirelessly transmit and receive information. The first field-positioned device is adapted to be located in a first stationary position and includes, a field transceiver adapted to receive at least one of the first player sensor data and the performance parameters, and to transmit at least one of the performance parameters and messages to the first player-mounted device. In other embodiments, the system includes display devices and a central processor.

59 citations

Patent
Brian C. Wadell1
01 Dec 1994
TL;DR: In this paper, the authors propose an RF module for configuring RF sources and receivers to make a wide range of measurements on a device under test, which includes a directional element which allows one receiver to measure both the input and the output signals from one test point.
Abstract: An RF module useful for configuring RF sources and receivers to make a wide range of measurements on a device under test. The module includes a directional element which allows one receiver to measure both the input and the output signals from one test point. In addition, the module allows multiple input signals to be combined for intermodulation testing. Multiple copies of the module are used to construct multiple channels in an RF tester. At least one RF source and one RF receiver can be connected to each channel. Each lead of a device under test is assigned to a channel, but one channel may be multiplexed to more than one lead. Switching circuitry included in each module allows the source from one channel to be used as an intermodulation signal for another channel. The module includes calibration standards for source and receiver level accuracy. With this arrangement, numerous RF measurements, including measurement of s-parameters, can be made on a device under test without dedicated instruments.

53 citations

Patent
09 Sep 1988
TL;DR: In this article, a card cage has slots for removably receiving circuit boards, and a plurality of circuit boards in the slots, at least one circuit board being a high-frequency board carrying an enclosure containing a highfrequency device.
Abstract: Electrical circuitry support apparatus including a card cage having slots for removably receiving circuit boards, and a plurality of circuit boards in the slots, at least one circuit board being a high-frequency board carrying an enclosure containing a high-frequency device. The enclosure provides shielding inhibiting transmission of high-frequency signals to or from the device.

26 citations


Cited by
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Patent
16 Sep 1998
TL;DR: A location reporting paging communication system comprising space satellites, ground stations and a remote receiving unit adapted to resolve a global position from signals transmitted from a communication transmitter is described in this paper.
Abstract: A location reporting paging communication system comprising space satellites, ground stations and a remote receiving unit adapted to resolve a global position from signals transmitted from a communication transmitter. The subscriber in possession of the remote receiving unit updates the paging network with global positioning information. A caller paging a subscriber in possession of the remote receiving unit may request the global location of the remote receiving unit. The paging network could divulge or block such information from a caller depending on the requirements of the subscriber.

1,162 citations

Journal ArticleDOI
10 Dec 2007
TL;DR: In this article, an inkjet-printed UHF and microwave circuits fabricated on paper substrates are investigated for the first time as an approach that aims for a system-level solution for fast and ultra-low-cost mass production.
Abstract: In this paper, inkjet-printed UHF and microwave circuits fabricated on paper substrates are investigated for the first time as an approach that aims for a system-level solution for fast and ultra-low-cost mass production. First, the RF characteristics of the paper substrate are studied by using the microstrip ring resonator in order to characterize the relative permittivity (epsivr) and loss tangent (tan delta) of the substrate at the UHF band for the first time reported. A UHF RFID tag module is then developed with the inkjet-printing technology, proving this approach could function as an enabling technology for much simpler and faster fabrication on/in paper. Simulation and well-agreed measurement results, which show very good agreement, verify a good performance of the tag module. In addition, the possibility of multilayer RF structures on a paper substrate is explored, and a multilayer patch resonator bandpass filter demonstrates the feasibility of ultra-low-cost 3-D paper-on-paper RF/wireless structures.

663 citations

Patent
04 Dec 2009
TL;DR: In this article, the radio tag doubles the transmitted frequency and returns the processed signal to a transceiver typically located on the player, and the currently transmitted frequency is then compared with the received frequency to obtain a difference frequency from which an apparatus may estimate the distance.
Abstract: Systems, apparatuses, and methods estimate the distance between a player and a ball by transmitting a chirp (sweep signal) to a radio tag located on the ball. During the chirp, the frequency of the transmitted signal is changed in a predetermined fashion. The radio tag doubles the transmitted frequency and returns the processed signal to a transceiver typically located on the player. The currently transmitted frequency is then compared with the received frequency to obtain a difference frequency from which an apparatus may estimate the distance. The apparatus may simultaneously receive the processed signal from the radio tag while transmitting the sweep signal.

581 citations

Journal ArticleDOI
TL;DR: In this article, the dielectric properties of liquid crystal polymer (LCP) have been investigated for millimeter-wave frequency bands at different LCP substrate thicknesses, and various transmission lines are fabricated on different thicknesses and the loss characteristics are given in decibels per centimeter.
Abstract: Liquid crystal polymer (LCP) is a material that has gained attention as a potential high-performance microwave substrate and packaging material. This investigation uses several methods to determine the electrical properties of LCP for millimeter-wave frequencies. Microstrip ring resonators and cavity resonators are measured in order to characterize the dielectric constant (/spl epsi//sub r/) and loss tangent (tan/spl delta/) of LCP above 30 GHz. The measured dielectric constant is shown to be steady near 3.16, and the loss tangent stays below 0.0049. In addition, various transmission lines are fabricated on different LCP substrate thicknesses and the loss characteristics are given in decibels per centimeter from 2 to 110 GHz. Peak transmission-line losses at 110 GHz vary between 0.88-2.55 dB/cm, depending on the line type and geometry. These results show, for the first time, that LCP has excellent dielectric properties for applications extending through millimeter-wave frequencies.

542 citations

Patent
20 Feb 2002
TL;DR: A modular personal network (MPN) as discussed by the authors is a set of devices that may be worn, carried, or used in close proximity to a user, including a control unit, a display, a user input and an audio output.
Abstract: We have disclosed a modular personal network (MPN) that includes multiple devices that may be worn, carried, or used in close proximity to a user. The devices communicate wirelessly. Functions of the MPN may be modified by adding or removing components. The MPN may communicate with a personal computer. General purpose devices may include a control unit, a display, a user input, and an audio output. The MPN may provide a variety of functions, including time, communication, entertainment, organization, guidance, athletic, medical, travel, outdoors, identity, security and military. The wireless protocol is preferrably based on the Bluetooth or IEEE 802.15 standards.

522 citations