Celadon Accepted to Present at the 2017 IEEE AP-S Symposium in San Diego, CA
Celadon, Inc. is excited to announce that the team has had two papers accepted for the 2017 IEEE AP-S Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting held July 9-15, 2017, at the Manchester Grand Hyatt Hotel in San Diego, CA. The symposium and meeting are cosponsored by the IEEE Antennas and Propagation Society (AP-S) and the U.S. National Committee (USNC) of the International Union of Radio Science (URSI). The meeting is expected to be a premier international forum for the exchange of state-of-the-art research in antennas, propagation, electromagnetic engineering, and radio science.
The first paper accepted is titled “Experimental Microwave Near-field Detection with Moveable Antennas” by authors Wenyi Shao, Arezou Edalati, Todd R. McCollough, and William J. McCollough. The paper describes a microwave detection system and presents microwave images using that particular system. Microwave imaging offers a non-destructive imaging method with applications for biomedical examinations and accelerating cancer diagnosis.
The microwave detection system contains two antennas, each placed on separate tracks, allowing for full rotation 360 degrees clockwise, and contains an object support tray allowing for translation up and down. One antenna is responsible for transmitting an electromagnetic signal to an object placed in the center of the microwave detection system on the object support tray and the other antenna is responsible for receiving the electromagnetic signal response. The entire system is fully automated and controlled by our self-developed software and can generate 3-D images. We used two pairs of patch antennas, one working at 3 GHz and the other at 4 GHz, and used each set to scan either a hollow polyvinyl chloride (PVC) cylinder or a solid wood object. A complete collection of data, with the receiver and transmitter rotated in 15-degree increments, while connected to a vector network analyzer, for either the incident electric field or total electric field, takes roughly seven to eight minutes. Four different 2-D images are presented, while using our self-developed phase confocal algorithm, with each image obtained in less than two seconds. The 2-D images successfully show the position of the objects. The 4 GHz image provides higher resolution than the 3 GHz image. Other types of antennas and objects can be used with our system to provide high quality microwave images and the measurement system and algorithm are extendable to 3-D cases.
The second paper accepted is titled “A Novel Dual-Band Beam-Switching Antenna Based on Active Frequency Selective Surfaces” by authors Arezou Edalati and William McCollough. The paper describes a dual-band beam switching antenna based on frequency selective surfaces (FSSs) that can be used in modern wireless communication systems. The antenna can operate in two frequency bands simultaneously, both a lower frequency band and a higher frequency band.
The dual-band beam switching antenna has a single source and has both an inner and an outer layer of FSSs. The inner FSS layer has twelve identical columns of metallic strips and the outer FSS layer has sixty identical columns of metallic strips. In each state of the antenna operation, diodes in three adjacent columns in the inner FSS layer, and diodes in seventeen adjacent columns in the outer FSS layer, are off, while the rest of the diodes are on. By changing the states of the diodes using a controller, the antenna scans the entire 360-degree azimuth plane, in twelve steps, with a thirty-degree interval between steps. The antenna operates at the two frequency bands of 0.75 GHz to 1 GHz and 1.7 GHz to 1.9 GHz, simultaneously (with a gain of 5.5 dBi or greater).
Omnidirectional antennas are currently widely used for cellular communications and have a lower gain (around 2 dBI or less) than the dual-band beam switching FSS antenna. If instead of using an omnidirectional antenna, a dual-band beam switching antenna with a high gain were used, the possible detection range and area of communications coverage is increased. The antenna forms an important part of a device that improves communications, while using 4G LTE, for emergency responders, by allowing for higher data rates and improved voice quality, and subsequently improves the delivery and treatment of needed health care. Further, the antenna has applications for enhancing rural internet connectivity. The antenna is able to point towards a cell tower nearby which provides the best signal strength and allows for the most reliable communications link.
We are excited about the innovations the Celadon team have made to transform healthcare. We expect both papers to be presented at the conference in San Diego and then published in IEEE Xplore. We will know more details about the exact day and time of the presentations at a later date.