Abstract
This letter presents a new approach for the design ofa multiresonant printed bowtie antenna. Several techniques wereattempted to obtain one antenna which is operational in the 2, 3,and 5 GHz bands corresponding to many wireless applications.The idea of creating different slot configurations on different partsof a single antenna is the basic principle. A prototype of the finalantenna design was fabricated tested and a good agreement wasfound between simulated and tested results.
Index Terms—Bowtie antennas, circular slots, hexagonic slots,Wi-Fi, WiMAX.
I. INTRODUCTION
Abowtie antenna is made from a bitriangular sheet of metalwith the feed at its vertex [1]. It is used extensively inmany applications such as ground penetrating radars [2]–[4] andmobile stations [5]. A bowtie antenna can be printed on a substratewhere each arm is placed either on the upper or lower surfaceof the substrate. The feeding of such structure is done bydesigning appropriate striplines that are connected to a coaxialfeed which is placed on one of the edges of the substrate.A lot of previous research was done on the printed bowtie antennato improve its wide-band characteristics. In [6], a doublesidedprinted bowtie antenna for ultrawide band (UWB) applicationsis presented. The frequency band considered is 3.1–10.6GHz, approved by the Federal Communications Commissionas a commercial UWB band. In [7], a double-sided roundedbowtie antenna (DSRBA) for ultrawide-band (UWB) communicationwas proposed. The antenna covers the UWB spectrumand shows that significant improvements in performance canbe achieved by using antennas with rounded patches insteadof using conventional flat-ended ones. The design of a bowtieantenna fed by broadside-coupled striplines (BCS) for the 2.4GHz ISM band is described in [8]. The two fins of the bowtieare on the two sides of the substrate. A quarter wave transformeris used to transform the microstrip line input to the BCSfeed. It is shown that the bowtie antenna with a 90 extendedangle exhibits the widest bandwidth. A novel slot bowtie antennawith very compact size that could be used as an on-chip orstand-alone antenna for an UWB system is discussed in [9]. The proposed antenna is a rectangular patch with a slot bowtie on itand printed on a Teflon substrate. The authors of [10] workedon a modified printed bowtie antenna to simultaneously coverthe operations in the and -bands from 5.5 to 12.5 GHz. Thepresented antenna has an end fire radiation pattern that makesit suitable for integration in single and dual polarized phasedarray systems. In [11], a back-to-back bowtie slot antenna fedby a coplanar waveguide (CPW) is designed to operate at Kaband around a center frequency of 38 GHz. The antenna structureis printed on a substrate with a dielectric constant of 2.2and a height of 0.245 mm. The coupling from the coplanar lineto the both slot radiating elements is accomplished via an aperturelocated within the ground plane to which the coplanar lineis connected. This configuration provides omnidirectional patternsfrom the two slot bowtie antennas radiating in oppositedirection.In this letter, the idea of introducing different slot configurationsinside the bowtie arms is investigated. Circular and hexagonalslots are introduced leading to double resonances in the 2and 3 GHz bands besides the resonance in the 5 GHz band.


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