Crossed Oval-Ring Slot Antenna With Triple-Band Operation for Wlan/Wimax Applications

Abstract

This paper presents the design of a crossed oval-ring microstrip slot antenna to achieve triple-frequency operation for WLAN/WiMAX applications. The proposed antenna is composed of a rectangular microstrip feed line and a ground plane on which three crossed oval-ring slots are etched. The three crossed slot loops finally excite three resonant modes and the resonant frequencies of the proposed antenna are mainly controlled by the dimensions and locations of the slot loops. The antenna prototype is fabricated and the characteristics are experimentally verified. The measured impedance bandwidths for triple operating bands can reach 840/670/940 MHz with return losses larger than 10 dB, which is enough for WLAN/WiMAX communication. In addition, good radiation characteristics with moderate peak gains are obtained and the measured and simulated results show a good agreement.

A Printed Monopole Antenna for Triple-Band WLAN/WiMAX Applications

“…Compared with the broadband antenna, the multiband antenna can effectively filtrate the unnecessary bands [1,2], which will reduce the system interference and complex for multimode operations. As a result, various kinds of multiband antennas including dual-band and triple-band antennas with different structures, such as those in [3][4][5][6][7][8][9][10][11], have been proposed to meet the applications for both multiband wireless communication systems. Firstly, two bands were involved in [3] by using a pair of multibranch strips in the radiator; a coplanar waveguide-(CPW-) fed printed monopole antenna with an n-shaped slot for dual-band operation was proposed in [4] and a complementary electric field coupled (CELC) resonator was loaded in the ground plane of a conventional patch antenna to achieve dualband operation in [5].…”

“…Firstly, two bands were involved in [3] by using a pair of multibranch strips in the radiator; a coplanar waveguide-(CPW-) fed printed monopole antenna with an n-shaped slot for dual-band operation was proposed in [4] and a complementary electric field coupled (CELC) resonator was loaded in the ground plane of a conventional patch antenna to achieve dualband operation in [5]. Furthermore, in [6][7][8][9][10][11], some triband antennas have been presented. A single-cell metamaterial loading was introduced to design triple-band monopole antenna in [6].…”

Unidirectional Antenna Using Two-Probe Excited Circular Ring Above Square Reflector for Polarization Diversity With High Isolation

“…The polarization diversity with two orthogonal excitations in the same antenna body has been proposed to minimize the whole antenna size [20][21][22][23]. The polarization diversity antenna with unidirectional pattern is very useful for base station applications such as WLAN system [24][25][26][27][28][29][30][31][32][33][34][35]. This paper presents the unidirectional antenna for polarization diversity of WLAN system following IEEE 802.11a standard with the operating frequency band between 5.150 GHz and 5.825 GHz.…”

A Novel Circular Slot Antenna With Two Pairs of T-Shaped Slots for Wlan/Wimax Applications

“…However, the slot antenna proposed in [10] can only satisfy the WiMAX standards. Though the oval-ring slot antenna reported in [11] can meet the requirement for WLAN and WiMAX simultaneously, it has a large size. The circular slot antenna studied in [12] has a much more complex structure for practical engineering applications.…”

“…In order to satisfy the IEEE 802.11 WLAN standards and the WiMAX standards simultaneously, multiband antennas with large impedance bandwidth and planar structure are required. For this, several types of antennas have been proposed for WLAN/WiMAX applications, such as planar inverted-F antennas (PIFAs) [1][2][3], monopole antennas [4][5][6][7], and slot antennas [8][9][10][11][12]. The PIFA antenna provides many desirable characteristics such as multiband operation and compact size while it has a complex structure and its 3D structure may be challenging in fabrication.…”