A dual notched band MIMO slot antenna system with Y‐shaped defected ground structure for UWB applications

Abstract

In this letter, a compact ultrawideband polarization diversity MIMO antenna system with dual band‐notched characteristics is proposed. The proposed antenna element consists of a metal ground with a stepped slot etched on it. The stepped slot is fed by a 50‐Ω microstrip line on the top layer. Dual notched bands (5G WLAN and 8G X band) are achieved by etching an open ended slot and a split ring resonator in the ground plane, respectively. Two identical antenna elements are arranged orthogonally and fed perpendicularly to obtain polarization diversity and enhance port isolation. A simple Y‐shaped defected ground structure is etched in the ground plane to suppress mutual coupling between two antennas and improve the impedance matching. Diversity performance in term of envelop correlation coefficient (ECC) and mean effective gain (MEG) are studied. The simulated and measured results show good agreement, which demonstrates that the proposed MIMO antenna system can be a good candidate for UWB MIMO system applications. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:626–630, 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].…”

“…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].…”

Design of a compact protrudent‐shaped ultra‐wideband multiple‐input‐multiple‐output/diversity antenna with band‐rejection capability

“…In Reference , polarization diversity and isolation in MIMO antenna system have been achieved by two quasi‐self‐complementary antenna elements, isolation can be achieved without additional decoupling structure owing to the inherent advantage of the self‐complementary structure and notched band at WLAN system is apprehended by inserting a bent slit in each of the radiating elements. Self‐similar and space‐filling properties of Koch fractal geometry are used to achieve wideband characteristics and isolation while cutting of a C‐shaped slot from the monopole of the antenna offers the band rejection in WLAN band .…”

Tri-band MIMO Antenna for WLAN, WiMAX and Defence System & Radio Astronomy Applications

“…In [8], a MIMO antenna with portable devices in UWB applications consists of a band-notched characteristic with an overall size of 80 × 75 mm 2 to reduce the isolation -35 dB in the resonating band of frequencies at 5.2 GHZ is used. Two metal strips that consists of λ/3 and λ/4 of length are used on the antenna in [9], Y-shaped MIMO antenna with defected ground structure for the applications design of UWB antenna in [10], Isolation enhancement with the help of two defected ground structures in [11], By inserting meandered feeding lines are arrange to placing in between the UWB MIMO antenna gets dual-polarised in [12], By inserting parasitic elements between the antennas to minimize the isolation effect for mobile terminal applications in [13]. Printed MIMO-antenna system is using neutralization-line technique was proposed for wireless USB-dongle applications in [14] with an overall size of 85 × 65 mm 2 with resonant frequency 2.4 GHz.…”