Compact band-notched UWB antenna for MIMO applications in portable wireless devices

Abstract

A compact 5.5 GHz band‐notched ultra‐wideband (UWB) 2‐element antenna with high isolation for multiple‐input multiple‐output (MIMO) portable wireless devices in wireless personal area network (WPAN) application is proposed. The MIMO antenna is designed for 3.1–10.6 GHz range on Neltec substrate with compact dimension of 43 × 20 mm2 and is tested experimentally. For the rejection band at 5.5 GHz, a slot of length 1.0 λ is etched into the radiator. Simple structure, i.e., receded steps at ground are used to improve isolation by 3 dB between two UWB antennas. The simulated and measured results show |S11| ≤ −10 dB and |S21| ≤ −20 dB in most of the frequency range excluding the reject band at 5.5 GHz in UWB range. The measured, simulated and calculated results show that the proposed UWB MIMO antenna is a good candidate for UWB MIMO systems. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1390–1394, 2016

A Very Compact Mimo Antenna With Triple Band-Notch Function for Portable Uwb Systems

“…This can also be done by adding strips or stubs adjacent to the radiator or ground or feed line as discussed in [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Each slot or strip can function as a resonator, and the slot or strip length controls the notch center frequency.…”

“…A number of experiments were done earlier to integrate the single and multiple band-notch functions for UWB systems and hence to mitigate the frequency interference from narrowband systems [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Methods such as etching λ/4 and λ/2 resonators on the ground [11], introducing split-ring resonator (SRR) slots on radiator [12], incorporating two rectangular strips on the ground plane [13], etching a 1λ slot into radiator [14], slitting λ/4 open-ended L-shaped slots on the radiator elements [15], employing λ/4 and λ/2 resonators [16], and using elliptical SRR on the radiator [17].…”

“…Methods such as etching λ/4 and λ/2 resonators on the ground [11], introducing split-ring resonator (SRR) slots on radiator [12], incorporating two rectangular strips on the ground plane [13], etching a 1λ slot into radiator [14], slitting λ/4 open-ended L-shaped slots on the radiator elements [15], employing λ/4 and λ/2 resonators [16], and using elliptical SRR on the radiator [17]. The proposed antennas in [11][12][13][14][15][16][17] mostly reject WLAN band only.…”

“…Methods such as etching λ/4 and λ/2 resonators on the ground [11], introducing split-ring resonator (SRR) slots on radiator [12], incorporating two rectangular strips on the ground plane [13], etching a 1λ slot into radiator [14], slitting λ/4 open-ended L-shaped slots on the radiator elements [15], employing λ/4 and λ/2 resonators [16], and using elliptical SRR on the radiator [17]. The proposed antennas in [11][12][13][14][15][16][17] mostly reject WLAN band only. Dual band-notched functions for UWB-MIMO antennas can be realized by employing nested C-shaped slots in the patch [18], etching 1λ loop path and 0.25λ slot on radiator [19], introducing strips beneath the patch [20], placing open-ended slot and SRR in the ground [21], placing a parasitic strip and open-ended slot on ground [22], or by loading trident-shape strip on the patch [23].…”

Two Element Band-Notched Uwb Mimo Antenna With High and Uniform Isolation

“…Moreover, parasitic meander lines are used between the antenna elements with reduced coupling presented in [5]. In [8], ground plane with protruded and receded rectangular steps is used to enhance isolation up to 5 dB between band notched UWB antenna elements. In [9], an antenna structure with two orthogonally placed monopoles in upper and lower planes to achieve 18 dB isolation between WLAN band-notched UWB antenna elements is studied experimentally.…”