| Records |
| Author |
Kramer, B.; Chen, C-C.; Volakis, J.D. |
| Title |
The development of a mini-UWB antenna |
Type |
Journal Article |
| Year |
2004 |
Publication |
Measurement and Techniques Association Symposium |
Abbreviated Journal  |
AMTA |
| Volume |
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Issue |
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Pages |
6 |
| Keywords |
optical antennas; Ultra Wide Band; Spiral Antenna, Dielectric Loading |
| Abstract |
There is a great interest in the automotive and military sectors for small and broadband antennas that meet modern communication needs. These needs require ultra-wide bandwidth (>10:1) UWB antennas, such as the spiral antenna. However, the physical size at the low-frequency end typically becomes too large for practical applications. To reduce the size of the antenna, miniaturization techniques must be employed such as the use of high-contrast dielectric materials. Size reduction using high-contrast materials has been demonstrated for narrowband antennas, such as patch antennas, but not for broadband antennas to our knowledge. Therefore, the concept of miniaturizing a broadband spiral antenna using dielectric materials will be investigated experimentally and numerically.Issues that arise from dielectric loading such as impedance reduction will also be addressed. It will be shown using the results from these studies that there are practical limitations to the amount of miniaturization which can be achieved. |
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RPLAB @ gujma @ |
Serial |
751 |
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| Author |
Dickert, Franz L. |
| Title |
Christoph A. Schalley (Ed.): Analytical methods in supramolecular chemistry |
Type |
Journal Article |
| Year |
2007 |
Publication |
Analytical and Bioanalytical Chemistry |
Abbreviated Journal |
Anal Bioanal Chem |
| Volume |
389 |
Issue |
7-8 |
Pages |
2039-2040 |
| Keywords |
supramolecular recognition |
| Abstract |
This is a review of book. |
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1618-2642 |
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no |
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563 |
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| Author |
Lieberzeit, Peter A.; Dickert, Franz L. |
| Title |
Chemosensors in environmental monitoring: challenges in ruggedness and selectivity |
Type |
Journal Article |
| Year |
2009 |
Publication |
Analytical and Bioanalytical Chemistry |
Abbreviated Journal |
Anal Bioanal Chem |
| Volume |
393 |
Issue |
2 |
Pages |
467-472 |
| Keywords |
environmental monitoring, in situ sensing, artificial recognition materials, real-life application, molecular imprinting, QCM |
| Abstract |
Environmental analysis is a potential key application for chemical sensors owing to their inherent ability to detect analytes on-line and in real time in distributed systems. Operating a chemosensor in a natural environment poses substantial challenges in terms of ruggedness, long-term stability and calibration. This article highlights current trends of achieving both the necessary selectivity and ruggedness: one way is deploying sensor arrays consisting of robust broadband sensors and extracting information via chemometrics. If using only a single sensor is desired, molecularly imprinted polymers offer a straightforward way for designing artificial recognition materials. Molecularly imprinted polymers can be utilized in real-life environments, such as water and air, aiming at detecting analytes ranging from small molecules to entire cells. |
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1618-2642 |
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no |
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564 |
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| Author |
Dickert, F. L.; Haunschild, A.; Kuschow, V.; Reif, M.; Stathopulos, H. |
| Title |
Mass-sensitive detection of solvent vapors. Mechanistic studies on host-guest sensor principles by FT-IR spectroscopy and BET adsorption analysis |
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Journal Article |
| Year |
1996 |
Publication |
Analytical Chemistry |
Abbreviated Journal |
Anal. Chem. |
| Volume |
68 |
Issue |
6 |
Pages |
1058-1061 |
| Keywords |
supramolecular recognition, quartz crystal microbalance, QCM, surface acoustic wave, SAW, mass-sensitive sensor, detector, calixarenes, MM3 force field, Brunauer, Emmett and Teller theory, BET |
| Abstract |
Chemical sensors, based on highly mass sensitive QMB or SAW devices, coated with thin layers of calixarenes, enable the detection of organic solvent vapours, especially halogenated or aromatic hydrocarbons, down to a few ppm. Force field calculations allow the tailoring of these sensor materials seeing that the predicted interaction energies between the host molecules and a large variety of analytes are linearly correlated to the measured sensor effects. These correlations and also BET adsorption analysis prove the analyte recognition properties of these calixarene coatings to be mainly based on host/guest inclusion principles. |
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0003-2700 |
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no |
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562 |
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| Author |
Hocker, L. O.; Sokoloff, D. R.; Daneu, V.; Szoke, A.; Javan, A. |
| Title |
Frequency mixing in the infrared and far-infrared using a metal-to-metal point contact diode |
Type |
Journal Article |
| Year |
1968 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl Phys Lett |
| Volume |
12 |
Issue |
12 |
Pages |
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| Keywords |
optical antennas |
| Abstract |
Metalâ€toâ€metal point contact diodes were used to obtain the 54â€GHz beat notes between two adjacent 10.6â€μ CO2 laser transitions. The speed of the diodes in the farâ€infrared is at least 1000 GHz. This was tested with a 337â€μ HCN laser. |
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no |
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RPLAB @ gujma @ |
Serial |
742 |
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