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Proceedings ArticleDOI

A novel compact MIMO antenna for ultra wideband applications

01 Feb 2015-pp 1-5
TL;DR: In this article, a novel microstrip fed compact multiple-input-multiple-output (MIMO) antenna is proposed for portable Ultra wideband (UWB) applications, which consists of two octagon shaped monopole antennas placed perpendicular to each other.
Abstract: In this paper, a novel microstrip fed compact multiple-input-multiple-output (MIMO) antenna is proposed for portable Ultra wideband (UWB) applications. The proposed antenna consists of two octagon shaped monopole antennas placed perpendicular to each other. Two protruding ground stubs are added and a short ground strip is used to connect the two ground planes of octagon shaped monopoles together. This forms a common ground plane to attain good isolation and impedance bandwidth. A prototype of the MIMO antenna with a dimension of 27 × 40 mm2 is simulated and the antenna performance is studied in terms of reflection co-efficient at the two input ports, coupling between the two input ports, radiation pattern and realized peak gain. The performance of the antenna satisfies the impedance bandwidth of greater than 3.1 to 10.6 GHz, low mutual coupling of less than −15 dB across the frequency band.
Citations
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Journal ArticleDOI
TL;DR: This research addresses the problem of TwoDimensional (2D) angle estimation for monostatic MultipleInput Multiple-Output (MIMO) radar and an expanded PARAFAC model is proposed to make full use of the Vandermonde-like structure of the data model.
Abstract: —In this research, we address the problem of TwoDimensional (2D) angle estimation for monostatic MultipleInput Multiple-Output (MIMO) radar. An expanded PARAFAC model is proposed to make full use of the Vandermonde-like structure of the data model, which expands the received data through unitary transformation and links the problem of 2D angle estimation to the PARAFAC model. Unlike the traditional estimation algorithms such as multiple signal classification (MUSIC) and estimation method of signal parameters via rotational invariance techniques (ESPRIT), the proposed algorithm does not require spectral peak searching nor eigenvalue decomposition of the received signal covariance matrix. Furthermore, our algorithm can achieve automatic pairing of 2D angles, and it has blind and robust characteristic, therefore the proposed algorithm has higher working efficiency. In addition, the proposed algorithm can detect more targets and has better estimation accuracy than ESPRIT algorithm and PARAFAC method. Extensive numerical experiments verify the effectiveness and improvement of our algorithm.

11 citations


Cites background from "A novel compact MIMO antenna for ul..."

  • ...Typical 2D arrays including octagon array [17], cross array [18], L-shape array [19] and rectangular array [20]....

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Journal ArticleDOI
01 Oct 2022-Optik
TL;DR: In this article , a compact multiple-input-multiple-output (MIMO) antenna is proposed which has high seclusion and band-reject qualities for ultra-wideband (UWB) applications.

4 citations

Proceedings ArticleDOI
01 Aug 2020
TL;DR: In this paper, a two-element planar ultra wideband MIMO monopole antenna is introduced, which is composed of two identical monopoles put together closely to attain a very compact size of $\mathbf{18\ x\ 30\ mm}^{2}}$.
Abstract: A novel two-element planar Ultra wideband MIMO monopole antenna is introduced in this paper. Antennas are composed of two identical monopoles put together closely to attain a very compact size of $\mathbf{18\ x\ 30\ mm}^{\mathbf{2}}$ . Two L-shaped parasitic stubs are incised on the ground plane to achieve superior seclusion between the elements of the antenna. CSRR slot and J-shaped slot are placed on two radiating antenna elements to attain band-notched characteristics for X-band applications and Wireless LAN at 8.2 GHz and 5.2 GHz. To improve impedance matching L-shaped and rectangular slots are chiselled on the bottom surface (ground). Proposed Ultra wideband MIMO antenna engulfs the frequency band from 3.1GHz to 12 GHz attaining high isolation of $\vert\mathbf{S12}\vert\&\vert\mathbf{S21}\vert\leq-\mathbf{23}$ dB for 3.1GHz to 12 GHz. Parameters like reflection coefficients, mutual coupling between antenna elements, ECC, Diversity and radiation characteristics is analyzed using simulated results. The simulation outcomes show that the designed antenna is a highly miniaturized structure and is acceptable for UWB communication applications.

3 citations


Cites background from "A novel compact MIMO antenna for ul..."

  • ...Thus the dual antenna system satisfies the impedance matching requirements throughout the whole Ultrawideband range as prescribed by US-FCC....

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  • ...A lot of research work is focussed on the design of various UWB MIMO antennas for the UWB band that is 3.1 -10.6 GHz as sanctioned by US-FCC [3]for commercial systems like WLAN and X band Satellite systems which might create viable intrusions to UWB operations at certain frequencies like 5.2 GHz and 8.2 GHz....

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  • ...6 GHz as sanctioned by US-FCC [3]for commercial applications....

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Journal ArticleDOI
TL;DR: In this article , a compact Dielectric Resonator (DR) based multiple-input-multiple-output (MIMO) antenna is presented for wideband applications, which consists of two modified kite-shaped monopoles where four DRs have been placed on the patch.
Abstract: In this communication, a compact Dielectric Resonator (DR) based multiple-input-multipleoutput (MIMO) antenna is presented for wideband applications. The antenna consists of two modified kite-shaped monopoles where four DRs have been placed on the patch. Corners of four DRs have been etched to implement the orthogonal phase, which leads to circular polarization characteristics. Implementation of DRs also helps in bandwidth enhancement purpose. Two L-shaped parasitic strips along with a Y-shaped stub have been used in the ground plane so as to obtain high isolation, which leads to a decrease of mutual coupling between the antenna elements. The proposed antenna achieves a wide impedance bandwidth of 7.1–22GHz (106%) along with low mutual coupling of less than −15 dB within the entire frequency range as well as circular polarization characteristics, which covers the frequency range (−3 dB) of 7.1–7.9GHz (10.6%). Thus the antenna can be considered as a potential candidate for modern wireless communication systems.

2 citations

References
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Journal ArticleDOI
D. Porcino1, W. Hirt2
TL;DR: The application potential and technical challenges presented by UWB radio as an unconventional but promising new wireless technology are discussed, with the potential to provide solutions for many of today's problems in the areas of spectrum management and radio system engineering.
Abstract: An unprecedented transformation in the design, deployment, and application of short-range wireless devices and services is in progress today. This trend is in line with the imminent transition from third- to fourth-generation radio systems, where heterogeneous environments are expected to prevail eventually. A key driver in this transition is the steep growth in both demand and deployment of WLANs/WPANs based on the wireless standards within the IEEE 802 suite. Today, these short-range devices and networks operate mainly standalone in indoor home and office environments or large enclosed public areas, while their integration into the wireless wide-area infrastructure is still nearly nonexistent and far from trivial. This status quo in the short-range wireless application space is about to be disrupted by novel devices and systems based on the emerging UWB radio technology with the potential to provide solutions for many of today's problems in the areas of spectrum management and radio system engineering. The approach employed by UWB radio devices is based on sharing already occupied spectrum resources by means of the overlay principle, rather than looking for still available but possibly unsuitable new bands. This novel radio technology has received legal adoption by the regulatory authorities in the United States, and efforts to achieve this status in Europe and Asia are underway. This article discusses both the application potential and technical challenges presented by UWB radio as an unconventional but promising new wireless technology.

1,023 citations

Journal ArticleDOI
TL;DR: In this paper, a USB dongle MIMO antenna for the 2.4 GHz WLAN band is presented, which consists of two antenna elements and a coupling element which artificially creates an additional coupling path between the antenna elements.
Abstract: This paper introduces a coupling element to enhance the isolation between two closely packed antennas operating at the same frequency band. The proposed structure consists of two antenna elements and a coupling element which is located in between the two antenna elements. The idea is to use field cancellation to enhance isolation by putting a coupling element which artificially creates an additional coupling path between the antenna elements. To validate the idea, a design for a USB dongle MIMO antenna for the 2.4 GHz WLAN band is presented. In this design, the antenna elements are etched on a compact low-cost FR4 PCB board with dimensions of 20times40times1.6 mm3. According to our measurement results, we can achieve more than 30 dB isolation between the antenna elements even though the two parallel individual planar inverted F antenna (PIFA) in the design share a solid ground plane with inter-antenna spacing (Center to Center) of less than 0.095 lambdao or edge to edge separations of just 3.6 mm (0.0294 lambdao). Both simulation and measurement results are used to confirm the antenna isolation and performance. The method can also be applied to different types of antennas such as non-planar antennas. Parametric studies and current distribution for the design are also included to show how to tune the structure and control the isolation.

413 citations

Journal ArticleDOI
TL;DR: In this paper, the authors developed principle design procedures for a single-layer coaxially fed rectangular microstrip patch antenna through examination of the structure's multiple resonant frequencies as well as the radiation and impedance properties of different antenna geometries.
Abstract: A wide operating bandwidth for a single-layer coaxially fed rectangular microstrip patch antenna can be obtained by cutting a U-shaped slot on the patch. This antenna structure has recently been found experimentally to provide impedance bandwidths of 10%-40%, even with nonair substrates. However, design rules for this antenna have not yet been presented. This paper develops principle design procedures through examination of the structure's multiple resonant frequencies as well as the radiation and impedance properties of different antenna geometries. The approximate design rules are derived by analysis of former experiments, method of moments (MoM) simulations, and measurement results. Simulations and measurements of several antennas designed using these new rules are presented and directions for further study are discussed.

328 citations

Journal ArticleDOI
TL;DR: In this article, a dual-printed inverted-F antenna diversity system for terminal devices operating at 5.2 GHz under both switched and combining schemes is presented, where diversity performance is evaluated by means of the calculated envelope correlation coefficient, the mean effective gain and the effective diversity gain of the two antennas.
Abstract: Dual-printed inverted-F antenna diversity systems for terminal devices operating at 5.2 GHz under both switched and combining schemes are presented. Diversity performance is evaluated by means of the calculated envelope correlation coefficient, the mean effective gain and the effective diversity gain of the two antennas. An investigation into the effect of the antennas' placement and of the corrugated ground plane on the performance of the system has also been conducted. It is shown that many configurations can provide uncorrelated signals of the same power level, but with significantly different radiation pattern complementarity, antenna efficiency, and effective diversity gain.

256 citations

Journal ArticleDOI
TL;DR: A method to derive the transfer function of the antenna has been proposed, which can be used to obtain the radiated pulses in the time domain, and a parametric study is conducted to provide antenna engineers with useful information for designing and optimizing the antenna.
Abstract: A compact diversity antenna operating at an ultrawideband (UWB) frequency range of 3.1-5 GHz is proposed for use in portable devices. The antenna printed on a printed circuit board (PCB) slab consists of two notched triangular radiating elements with two feeding ports. A ground plane is etched on the reverse side of the PCB. The shape of the ground plane is optimized to improve the isolation between the ports as well as impedance matching. The simulated and measured results show that across the operating bandwidth, the antenna can achieve a broad impedance bandwidth with good performance in terms of isolation of -2 dBi, and efficiency of > 70%. The correlation between the radiation patterns shows consistent diversity performance across the UWB bandwidth. A method to derive thetransfer function of the antenna has been proposed, which can be used to obtain the radiated pulses in the time domain. Furthermore, a parametric study is conducted to provide antenna engineers with useful information for designing and optimizing the antenna.

170 citations