NDLI: Small broadband receiving antenna using a Fabry-Perot etalon

Content Provider	IEEE Xplore Digital Library
Author	Meyer, G.V. Wittneben, A.
Copyright Year	2005
Description	Author affiliation: ETH Zurich, Switzerland (Meyer, G.V.; Wittneben, A.)
Abstract	A novel concept for a broadband electric-field (E-field) receiving antenna is proposed. The reactive near field, induced by an impinging E-field, of a very short, short-circuited dipole is picked-up with the aid of an electro-optical modulator. The modulator is designed as a Fabry-Perot etalon. The laser light guided in the etalon is modulated proportionally to the near field of the dipole. The advantage of the etalon is to considerably increase the sensitivity of the antenna compared to known electro-optic probes. It is shown analytically for an ellipsoidal dipole and numerically for a cylindrical dipole, that only the quasi electrostatic terms of the dipole field are relevant. Important is the optimal choice of the material of the modulator. Since the linear electro-optical effect is used, best results are achieved if the index ellipsoid of the material parameters does not rotate under the influence of an external field but only varies its size. Such behaviour is found in materials as e.g. LiNbO/sub 3/ and poled polymers. Because of reflections, a second parameter of concern is the permittivity of the modulator base material. Polymers are the most promising materials known today for this type of antennas. The proposed antenna may either be used as broadband E-field probe or receiving antenna. It features low coupling because of the small size and the fibre optic feeding, low signal attenuation in the feeding and large bandwidth. This type of antennas is therefore optimally suited for distributed UWB antenna systems where only one way wireless communication is necessary.
Starting Page	190
Ending Page	195
File Size	717306
Page Count	6
File Format	PDF
ISBN	078039397X
DOI	10.1109/ICU.2005.1569982
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-09-05
Publisher Place	Switzerland
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Dipole antennas Electrooptic modulators Ultra wideband antennas Fabry-Perot Broadband antennas etalon Receiving antennas electro-optic antenna Lasers and electrooptics Optical materials Polymers Probes Antenna
Content Type	Text
Resource Type	Article

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