I. INTRODUCTION
The popularity of the wireless communication is an extension of the success of WiFi in making data communication highly accustomed in daily life. The low cost data communication thru WiFi services makes 3G, which is notorious with high cost, difficult for market expansion. The 4G mobile system was released almost immediately afterward for its outstanding capability in high speed data communication and the general expectation of more convenience in mobile life. However, the frequency bandwidth needs to cover 2.3-3.8GHz and 4.9-5.925GHz to meet the requirement for a combination of the systems of WLAN and WiMax. In [1] is a double-T monopole antenna with a bandwidth of high frequency smaller than 300MHz that cannot fully meet the WLAN application. In [2] is a double-loop antenna that generates sufficient bandwidth for WLAN but uneven radiation pattern. In [3] is a microstrip-fed dipole antenna with a bandwidth of high frequency smaller than 400MHz, unable to fully assure the WLAN application. In [4] is a dipole antenna with internal matched circuit that can be as small as 12mm45mm. In [5, 6] are dual-band monopole antennas with parasitic element matched can meet the bandwidth requirement yet again, radiation pattern uneven. In [7] is another compact microstrip-fed dual-band coplanar antenna but with a large value of cross-polarization. In [8] is a sleeve dipole antenna incorporating two separate dipoles ofdifferent arm lengths printed on two sides of a dielectric substrate to signify a dual-band oscillation at 2.4 and 5.5GHz. It has better frequency bandwidth and gain value for WLAN application. In [9] presents an ultrawide-band(UWB) antenna with a ground of bigger size and a smaller circular element. In [10] presents a dual-band antenna that excites two separate up and down radiators to generate a dipole-like characteristic with a microstrip-fed line. The frequency band and gain value of this antenna can meet the requirement of WLAN application of America.
A simple design of multiband printed antenna operating at 2.4/3.4/5.2/5.8 GHz is proposed in this paper, the prototype of it fabricated and experimentally tested. The measured VSWR 2:1 bandwidths are 1.82 GHz and more than 1.1 GHz in the 2.4- and 5.2-GHz bands, respectively. The VSWR, characteristics of radiation patterns and the antenna efficiency will be specified in the following sections. All the simulations in this paper are conducted by HFSS software. Measurements are carried out by R&S ZVL (9 kHz-6GHz).
I. INTRODUCTIONThe popularity of the wireless communication is an extension of the success of WiFi in making data communication highly accustomed in daily life. The low cost data communication thru WiFi services makes 3G, which is notorious with high cost, difficult for market expansion. The 4G mobile system was released almost immediately afterward for its outstanding capability in high speed data communication and the general expectation of more convenience in mobile life. However, the frequency bandwidth needs to cover 2.3-3.8GHz and 4.9-5.925GHz to meet the requirement for a combination of the systems of WLAN and WiMax. In [1] is a double-T monopole antenna with a bandwidth of high frequency smaller than 300MHz that cannot fully meet the WLAN application. In [2] is a double-loop antenna that generates sufficient bandwidth for WLAN but uneven radiation pattern. In [3] is a microstrip-fed dipole antenna with a bandwidth of high frequency smaller than 400MHz, unable to fully assure the WLAN application. In [4] is a dipole antenna with internal matched circuit that can be as small as 12mm45mm. In [5, 6] are dual-band monopole antennas with parasitic element matched can meet the bandwidth requirement yet again, radiation pattern uneven. In [7] is another compact microstrip-fed dual-band coplanar antenna but with a large value of cross-polarization. In [8] is a sleeve dipole antenna incorporating two separate dipoles ofdifferent arm lengths printed on two sides of a dielectric substrate to signify a dual-band oscillation at 2.4 and 5.5GHz. It has better frequency bandwidth and gain value for WLAN application. In [9] presents an ultrawide-band(UWB) antenna with a ground of bigger size and a smaller circular element. In [10] presents a dual-band antenna that excites two separate up and down radiators to generate a dipole-like characteristic with a microstrip-fed line. The frequency band and gain value of this antenna can meet the requirement of WLAN application of America.A simple design of multiband printed antenna operating at 2.4/3.4/5.2/5.8 GHz is proposed in this paper, the prototype of it fabricated and experimentally tested. The measured VSWR 2:1 bandwidths are 1.82 GHz and more than 1.1 GHz in the 2.4- and 5.2-GHz bands, respectively. The VSWR, characteristics of radiation patterns and the antenna efficiency will be specified in the following sections. All the simulations in this paper are conducted by HFSS software. Measurements are carried out by R&S ZVL (9 kHz-6GHz).
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