Journal of Scientific Instruments Editor: Dr H R Lang Vol 28 and Supplement No 1, 1951 Pp xvi + 388 + iii + 80 (London: Institute of Physics, 1951) Bound, £3 12s; unbound, £3

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A Review of Scientific Instruments

In this letter, a band-notched ultrawideband (UWB) antenna is presented and the notched-band characteristic is realized by a compact coplanar waveguide (CPW) resonant cell (CCRC). The antenna with a total size of 46 mm $,times,$30 mm operates in a band from 2.67 to over 12 GHz, and shows omnidirectional radiation patterns. Measurements indicate that the antenna presents a notched band from 5.10 to 5.94 GHz for $ VSWR ge 3:1$, which covers the wireless local area network (WLAN) band. The time-domain behaviors and the CCRC are discussed and the group delay is given experimentally. Also, parametric studies are performed numerically in the end.

A Band-Notched Ultrawideband Printed Monopole Antenna

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Microwave electronics: Hartwig thim zur emeritierung

Two printed wide-slot antennas with square patches within an arc-shape slot are proposed in this letter. They are fed by a coplanar waveguide (CPW) and a microstrip line with almost the same performances. Their impedance bandwidths for $ S_11leq -10~ dB$ are enhanced largely to more than 158%. The radiation patterns are given at 2, 6, and 10 GHz.

Bandwidth Enhancement of Wide-Slot Antenna Fed by CPW and Microstrip Line

—The study of a planar circular slot antenna for Ultrawideband (UWB) communications is presented. The integration on this antenna of a notch filter, to reduce the possible interferences with the 5GHz WLAN communications, has been discussed in detail. Four different structures, achieved by etching a suitable pattern on the antenna circular stub, have been considered, and their features have been compared. The antenna with symmetrical and inverted-L cuts shows the best performance, and it has been therefore realized and fully characterized. It shows very good matching features over the UWB band, and notable rejection of the 5 GHz WLAN band.

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UWB Circular Slot Antenna Provided with an Inverted-L Notch Filter for the 5 GHz WLAN Band

A set of measurements with the CAPRICE ion source at the GSI test bench has been carried out to investigate its behavior in terms of intensity and shape of the extracted beam when the microwaves generating the plasma sweep in a narrow range of frequency (+/-40 MHz) around the klystron center frequency (14.5 GHz). Remarkable variations have been observed depending on the source and the beamline operating parameters, confirming that a frequency dependent electromagnetic distribution is preserved even in the presence of plasma inside the source. Moreover, these observations confirm that the frequency tuning is a powerful method to optimize the electron cyclotron resonance ion source performances. A description of the experimental setup and of the obtained results is given in the following.

Observations of the frequency tuning effect in the 14 GHz CAPRICE ion source

We present a detailed study of a very large band planar circular asymmetrical dipole antenna, fed by a microstrip, for the purpose of covering most of the common communication channels with one solution. The study has been performed on two planar substrates having different dielectric permittivities. The prototype on the substrate with lower permittivity shows much larger bandwidth, and it has been realized and fully characterized, in terms of impedance matching and radiation properties. Its measured band ratio is 21.9:1. The comparison with other super-wideband (SWB) antennas of similar type, with more complex design and therefore required optimization, shows that this prototype has very appealing features of very large absolute bandwidth and band ratio, and a compact size.

Study on Super-Wideband Planar Asymmetrical Dipole Antennas of Circular Shape

We present a single-layer circular-slot antenna, fed by a microstrip ending with a rectangular stub, which is suitable for wireless ultra-wideband (UWB) communications. The antenna is fully characterized in terms of impedance bandwidth, phase linearity, gain, and radiation pattern. The time-domain pulse response versus azimuth and elevation is also studied numerically. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 465–470, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20669

Numerical and experimental analysis of a circular slot antenna for UWB communications

A numerical and experimental study of a circular-slot antenna, fed by a coplanar waveguide with a rectangular stub, is proposed in this paper for ultra-wideband communications. The antenna impedance bandwidth, phase linearity, gain and radiation patterns are presented, together with the time-domain impulse response. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2272–2277, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21900

S. Barbarino

Papers

UWB Circular Slot Antenna Provided with an Inverted-L Notch Filter for the 5 GHz WLAN Band

Observations of the frequency tuning effect in the 14 GHz CAPRICE ion source

Study on Super-Wideband Planar Asymmetrical Dipole Antennas of Circular Shape

Numerical and experimental analysis of a circular slot antenna for UWB communications

Study of a CPW-fed circular slot antenna for UWB communications