Design of a Shape-Constrained Dual-Band Polygonal Monopole for Car Roof Mounting

• Published in: IEEE transactions on vehicular technology Vol. 57; no. 3; pp. 1398 - 1403
• Main Authors: Cerretelli, M., Tesi, V., Biffi Gentili, G.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-05-2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antennas; Applied sciences; Automotive applications; Automotive components; Automotive engineering; Bands; Design engineering; Dual band; Equipments and installations; Etching; Exact sciences and technology; Geometry; Global Positioning System; Ground, air and sea transportation, marine construction; Impedance matching; Matching; Mobile antennas; Mobile radiocommunication systems; Monopoles; multifrequency antennas; Patch antennas; Radiocommunications; Road transportation and traffic; road vehicles; Roofs; Satellite telecommunications. Space telecommunications; Shape; Telecommunications; Telecommunications and information theory; Telephony; Europe; multifrequency antennas; Impedance matching; road vehicles; mobile antennas; Performance evaluation; Mobile radiocommunication; Motor car; GPS system; Road vehicle; Wireless telecommunication; Printed antenna; Radiolocalisation; Compact design; Monopole; Fan; Satellite navigation; Multifrequency antenna; Automobile industry; Monopole antenna; Mobile antenna; Cost lowering; Low k dielectric; Antenna radiation patterns; Planar technology
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2007.912153

This paper describes the design of a new compact dual-band roof antenna (which is capable of operating in both U.S. and European mobile telephone bands) for automotive applications. The flipper shape of the antenna and its dimensional constrains are chosen according to prevailing automotive market trends. The chosen basic geometry of the radiating element is a planar printed monopole structured as a vertical fan with two narrow strips folding toward the ground plane and etched on a low-cost, medium-permittivity thin substrate. The geometrical variations of the basic radiating structure are introduced afterward to constrain the antenna shape under the assigned profile and to allow easy integration of a small Global Positioning System patch antenna without affecting radiation and bandwidth performances. The integration of a matching network directly over the etched monopole trace allows a good input matching over the lower and upper operative bands to be obtained, slightly affecting the radiation efficiency of the whole antenna.