Compact Uwb Band-Notch Mimo Antenna With Embedded Antenna Element for Improved Band Notch Filtering

Int J RF Microw Comput Aided Eng

Kanaujia

et al. 2018

This article presents a coplanar waveguide fed global system for mobile communications band integrated ultra wide band (UWB) multiple input multiple output (MIMO) antenna with single and dual notch band characteristics. The novelty of the antenna lies in its design as all the unit cells of the proposed UWB MIMO antenna structure are orthogonal to each other therefore the additional isolation elements responsible for achieving high isolation are not required consequently making proposed antenna design simple and easy to fabricate. In this context, 2 MIMO systems have been designed. The first MIMO system is consisting of a dual port antenna whereas the second MIMO system is a printed quad port antenna; further single and dual notch band are achieved in the proposed multi-port MIMO antenna. The antenna shows pattern diversity throughout the impedance bandwidth range. The gain of the antenna varies from 4 to 8.48 dBi. The 2 band notches are achieved at 4.8 and 7.7 GHz in the UWB range. The proposed antenna is fabricated and it is found measured results are in good agreement with simulated results.The emerging wireless and mobile communication applications demand diverse and versatile antennas which are low profile, easy to fabricate and integrable with the handheld integrated circuit along with high data rate and superior quality of service. In recent wireless communication systems, the major problem is multipath fading which is due to reflection, refraction and diffraction of electromagnetic waves in free space. The problem of multipath fading can be resolved by making use of frequency diversity, spatial diversity, or polarization diversity technique. The concept of multiple input multiple output (MIMO) is very much useful for reducing the multipath fading effects thereby achieving superior data rate, range and reliability without increasing any transmit power or bandwidth. However, due to limited availability of space in the handheld devices, the placement of multiple antennas inside the device is a challenging task. Because of closely operating frequencies and space limitations the radiating elements are exposed to high mutual coupling amongst them. Therefore, there is a need for compact and efficient MIMO antenna with low mutual coupling, high isolation and unwanted frequency band suppression.As per Federal Communication Commission, the bandwidth allocated for unlicensed ultra wide band (UWB) spectrum range is from 3.1 to 10.6 GHz. 1 Due to such large operating range UWB antennas can be employed for shortrange radars, medical imaging, high data rate transmission, broadband wireless applications, and so forth. In the last few years, various designs of UWB MIMO antennas have been proposed by a number of researchers. A few of them employ simple monopole antennas with rectangular, circular, elliptical, and trapezoidal shapes with wide impedance bandwidth and improved radiation properties, 2-6 therefore, covering several mobile wireless standards. In 2 antenna structure with 2 radiating element is proposed with common...

“…The schematic of proposed dual band notch UWB MIMO antenna front and back view is shown in Figure A,B, respectively. The dimensions of embedded T‐shaped slot is calculated by the equation

L_{\frac{normalλ g}{2}} = \frac{c}{2 \times f_{normalc} \times \sqrt{\frac{1 + ɛ_{r}}{2}}}

L_{\frac{normalλ g}{4}} = \frac{c}{4 \times f_{normalc} \times \sqrt{\frac{1 + ɛ_{r}}{2}}}

where

L_{\frac{normalλ g}{2}}

and

L_{\frac{normalλ g}{4}}

Section: Four‐element Uwb Mimo Antenna With Double Band Notchmentioning

confidence: 99%

A CPW-fed UWB MIMO antenna with integrated GSM band and dual band notches

Srivastava

Int J RF Microw Comput Aided Eng

Kanaujia

et al. 2018

“…Therefore, in many UWB antenna design problems, it becomes essential to eliminate the interfering bands. Various UWB MIMO antennas exhibiting single/multiple band rejection characteristics have been reported in the last few years . However, MIMO antennas deploying elliptical patches with a high value of eccentricity are relatively less explored.…”

Section: Introductionmentioning

confidence: 99%

Compact four‐port MIMO antenna on slotted‐edge substrate with dual‐band rejection characteristics

Raheja

Kanaujia

Int J RF Microw Comput Aided Eng

2019

A compact ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna with dual band elimination characteristics is presented. The proposed MIMO antenna is comprised of four identical elliptical shaped monopole radiators located orthogonally to each other. A second order Koch fractal geometry is applied on the edges of the ground planes of the radiating elements; to reduce the overall size of the MIMO antenna, without compromising the lower frequency response. Further, in order to eliminate the undesired resonant bands (3.5 and 5.5 GHz) from UWB, an elliptical complementary split ring resonator is introduced in the monopole radiator. For reducing inter-element coupling in the proposed MIMO antenna, a different approach (of slotted edge substrate) is used, as a substitute of traditional decoupling stub/elements. In the entire operating band of 3 to 13.5 GHz, inter-element isolation more than 22 dB and envelope correlation coefficient less than 0.008 are obtained.The measured parameters of the fabricated prototype antenna are found in good agreement with the simulated results. K E Y W O R D S CSRR, elliptical, Koch fractal, MIMO, UWB

“…A coplanar waveguide (CPW)‐fed MIMO antenna with two radiating elements located perpendicularly to each other for achieving better isolation was proposed. In this design, four distinct stubs were embedded to eliminate 5.15‐6 GHz band from the UWB spectrum . A dual‐port MIMO antenna with the ground plane loaded with a pair of rectangular strip for notching 5.15‐5.85 GHz frequency band and T‐shaped stub for mutual coupling reduction was reported for UWB applications .…”

Section: Introductionmentioning

confidence: 99%

“…In this design, four distinct stubs were embedded to eliminate 5.15-6 GHz band from the UWB spectrum. 21 A dual-port MIMO antenna with the ground plane loaded with a pair of rectangular strip for notching 5.15-5.85 GHz frequency band and T-shaped stub for mutual coupling reduction was reported for UWB applications. 22 A CPW-fed MIMO antenna in Reference 23 was comprised of shared radiators with band rejection at Wi-MAX and WLAN frequency band.…”

Section: Introductionmentioning

confidence: 99%

Multiple‐input‐multiple‐output/diversity antenna with dual band‐notched characteristics for ultra‐wideband applications

Micro & Optical Tech Letters

Lee

Kim

et al. 2019

Design and implementation of a four‐port ultra‐wideband (UWB) multiple‐input‐multiple‐output (MIMO)/diversity antenna with dual band‐notched characteristics are presented. The proposed diversity antenna is composed of four identical rhombic‐shaped monopole radiators arranged orthogonally to achieve better interelement isolation and polarization diversity. At each port, the MIMO antenna shows an impedance bandwidth (S11 ≤ –10 dB) of 10.5 GHz (2.8‐13.3 GHz) and an interelement isolation larger than 18 dB. Furthermore, in order to eliminate 3.5 GHz (Wi‐MAX) and 5.5 GHz (WLAN) bands from the UWB range, the antenna radiators are loaded with elliptical complementary split ring resonator structures. The MIMO performance metrics such as isolation, envelope correlation coefficient, and apparent diversity gain are calculated and presented. The MIMO/diversity antenna prototype is fabricated, and experimental results are verified with simulated results.