Tri-Band Two Elements Antenna
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Tri‑Band Two Elements Antenna Bazil Taha Ahmed1 · Rubén Pérez Villar1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this work, an antenna that consists of two connected radiating elements is presented. The antenna has three operating bands, namely 2.5 GHz band, 3.5 GHz band, and narrow or wide 5.5 GHz band. To get a narrow 5.5 GHz band, a band-reject filter that eliminates the higher part of the third operating band is used. Measurements show that the antenna gain is 3.1 dB at 2.5 GHz; meanwhile at 8 GHz it has a gain of 4.9 dB. Adding a metallic reflector, a maximum gain of 5.8 dB has been measured at 3.7 GHz. Keywords Two elements antenna · Tri-band antenna · Antennas · WiFi · WiMax · Antenna gain · Multiband Antenna
1 Introduction WiMAX systems works in the 3.5 GHz band meanwhile WiFi works in the 2.4 and 5.5 GHz bands. To get tri-band antenna from UWB antenna, two notch filters can be used to get this object. A tri-band antenna can be designed by introducing multiple branch strips multiple slots, as well as parasitic elements to a monopole antenna to excite multiple resonance modes. In [1], a three band antenna for WiFi and WiMAX is given. The antenna is composed of two different elements that are an inverted-L monopole operating at 5.2 and 5.8 GHz and a coupled modified half-wavelength open loop resonator operating at both 2.4 and 3.5 GHz used to cover the required bandwidth for IEEE 802.11a/b/g WLAN and IEEE 802.16e WiMAX. In [2], a patch antenna using microstrip line feeding stacked is proposed to be used in WiMAX/WiFi applications. Dual band characteristic is achieved at 2.55 and 5.25 GHz. In [3], a triple-band monopole antenna covering WLAN/WiMAX bands is investigated. The proposed antenna consists of a circular ring, a split ring radiator and a trapezoid coplanar waveguide-fed structure. The antenna works at three bands of 2.27–2.55 GHz, 3.23–4.14 GHz, and 5.08–6.03 GHz for WLAN and WiMAX applications. In [4] a tri-band slotted patch antenna operating at frequencies of 28, 38 and 61 GHz is proposed. The proposed antenna employs a slotted patch structure combining Land F-shaped slots. In [5], a tri band PIFA for mobile handset applications is proposed. The proposed antenna covers both GSM at 0.93 GHz and DCS at 1.8 GHz. In [6], a triband * Bazil Taha Ahmed [email protected] 1
Universidad Autónoma de Madrid Escuela Politécnica Superior, 28049 Madrid, Spain
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B. T. Ahmed, R. P. Villar
antenna based on PIFA element is proposed. The measured bandwidths of this antenna are (2.39–2.48 GHz), (3.36–3.76 GHz), and (4.7–6.3 GHz). In [7], a 9-shaped printed monopole antenna for RFID and WLAN operations has been presented. Normally the number of radiating elements of an antenna is equal to the number of its operating bands. In this article, a tri band with only two radiating elements antenna is represented. The rest of the paper is organized as follows. In Sect. 2, the antenna design and simulation results are given. In Sect. 3, practical r
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