A dual‐band WLAN/UWB printed wide slot antenna for mimo/diversity applications

Abstract

In this article, a dual-band WLAN/ultrawideband (UWB) printed wide slot microstrip-fed antenna is presented for multi-input multi-output (MIMO)/diversity applications. The proposed antenna consists of a U-shaped patch, a T-shaped monopole path, and a pentagonal wide slot in the ground plane. The antenna is designed to cover both the WLAN (2.4-2.485 GHz) and UWB (3.1-10.6 GHz) ranges, with value of S 11 below À10 dB. The antenna is constructed on a FR4 substrate with overall dimensions of 28 Â 28 Â 1 mm 3 . It is shown that the proposed dual-band antenna is suitable for diversity polarization applications. The simulation results show that the different configurations of the antenna in the MIMO/diversity have good Sparameters over the operating frequency bands. The simulation and measured results of the proposed dual-band antenna as well as that of the MIMO/diversity antenna configuration agree well. V C 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:461-465, 2013; View this article online at wileyonlinelibrary.com.ABSTRACT: A continuously variable transmission type W-band phase shifter based on a single pole bandpass filter tuned by MEMS actuated fingers is reported. Tuning is achieved by means of two half-wavelength long conductive fingers that synchronously rotate upwards in an antiparallel fashion. The fingers deflection results in a distributed variable shunt capacitance which in turn leads to a variable analog phase shift. For an applied DC bias voltage between 0 and 26 V, the transmission phase can be continuously varied up to 46.4 at a frequency of 106 GHz with an insertion loss of less than 3.4 dB. V C 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:465-468, 2013; View this article online at wileyonlinelibrary.com.

A Compact Band-Notched Ultra-Wideband Spatial Diversity Antenna

“…Many studies have been carried out to design UWB diversity antennas [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. However, the impedance bandwidth of the antennas in [5][6][7][8] cannot cover the whole UWB, and the sizes of the antennas are relatively large in [5,[9][10][11][12][13][14][15][16][17] which are not suitable for some portable devices' applications.…”

“…However, the impedance bandwidth of the antennas in [5][6][7][8] cannot cover the whole UWB, and the sizes of the antennas are relatively large in [5,[9][10][11][12][13][14][15][16][17] which are not suitable for some portable devices' applications. On the other hand, the frequency range for UWB systems between 3.1 to 10.6 GHz will cause interference to the existing wireless communication systems, such as the wireless local area network (WLAN) for IEEE 802.11a operating in 5.15-5.825 GHz, so the UWB diversity antenna with a band-notched function is desired in the design.…”

“…On the other hand, the frequency range for UWB systems between 3.1 to 10.6 GHz will cause interference to the existing wireless communication systems, such as the wireless local area network (WLAN) for IEEE 802.11a operating in 5.15-5.825 GHz, so the UWB diversity antenna with a band-notched function is desired in the design. However, the antennas in [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] do not have the band-notched function to avoid the interference. Recently, some antennas with band-notched function have been reported [22][23][24][25][26][27].…”

Compact printed high rejection triple band-notch UWB antenna with multiple wireless applications

“…Quarter wavelength slits corresponds to frequency bands of 1.3 GHz (GPS), 1.8 GHz (GSM), 2.4 GHz (Lower band WLAN) and diamond-shape radiating patch corresponds to UWB band (3.10-10.60 GHz). In [8], monopole antenna which operates in dual band (WLAN/UWB) is reported for Multi-Input-Multi-Output/Div ersity applications consisting U-shaped patch along with Tshaped monopole path and pentagonal wide slot ground plane. The metallic surfaces of microstrip antennas cause a large RCS values.…”

Compact Ultrawideband Mimo Antenna With Wlan/Uwb Bands Coverage

“…However, all the methods mentioned above have narrow bandwidths which make the antennas not suitable for the UWB application. To get a wide-band MIMO antenna, the UWB diversity antennas are usually used [16][17][18]. The principle of this method is similar to the dual polarized antennas.…”