Notched Ground Plane Research Articles

Optimization of Planar Monopole Wideband Antenna for Wireless Communication System

In this paper, a new compact wideband monopole antenna is presented for wireless communication applications. This antenna comprises of a new radiating patch, a new arc-shaped strip, microstrip feed line, and a notched ground plane. The proposed radiating patch is combined with a rectangular and semi-circular patch and is integrated with a partial ground plane to provide a wide impedance bandwidth. The new arc-shaped strip between the radiating patch and microstrip feed line creates an extra surface on the patch, which helps further widen the bandwidth. Inserting one step notch on the ground plane further enhances the bandwidth. The antenna has a compact size of 16×20×1.6mm3. The measured result indicated that the antenna achieves a 127% bandwidth at VSWR≤2, ranging from 4.9GHz to 22.1GHz. Stable radiation patterns with acceptable gain are achieved. Also, a measured bandwidth of 107.7% at VSWR≤1.5 (5.1-17GHz) is obtained, which is suitable for UWB outdoor propagation. This antenna is compatible with a good number of wireless standards, including UWB band, Wimax 5.4 GHz band, MVDDS (12.2–12.7GHz), and close range radar and satellite communication in the X-band (8-12GHz), and Ku band (12-18GHz).

Internal coupled‐fed loop antenna integrated with notched ground plane for wireless wide area network operation in the mobile handset

AbstractAn internal wireless wide area network (824–960/1710–2170 MHz) antenna suitable to be disposed at a notched region (size 10 × 40 mm2) of the system ground plane of the handset to achieve compact integration therein is presented.The notched system ground plane, compared to the traditional rectangular system ground plane at which the internal antenna is generally disposed at the entire top or bottom edge of the ground plane, can lead to more compact layout design of the internal antenna and associated electronic elements in the handset. The proposed antenna has a simple structure occupying a small volume of 10 × 40 × 5 mm3 and comprising a monopole feed and a coupled strip. The latter is coupled‐fed by the monopole feed to provide a 0.25‐wavelength loop path, which generates a 0.25‐wavelength loop mode at about 850 MHz and a higher‐order loop mode at about 1.7 GHz. The monopole feed also contributes a 0.25‐wavelength mode at about 2.1 GHz to combine with the higher‐order loop mode to form the antenna's upper band. The bandwidth enhancement of the 0.25‐wavelength loop mode is obtained by adding an external bandstop circuit, which makes the desired antenna's lower band achieved. The antenna also meets the specific absorption rate and hearing‐aid compatibility requirements for practical applications. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:553–555, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26620

Square Monopole Antenna for UWB Applications With Novel Rod-Shaped Parasitic Structures and Novel V-Shaped Slots in the Ground Plane

A novel band-notched ultrawideband monopole antenna is presented. The proposed antenna consists of a stepped square radiating patch, two rod-shaped parasitic structures for generating band-notched function instead of changing the patch or feeding shapes, and a notched ground plane with two novel V-shaped slots that provide a wide usable bandwidth of more than 200% (3-22.5 GHz). With two rod-shaped parasitic structures, frequency band-stop performance is generated, and characteristics such as band-notch frequency and bandwidth can be controlled. The designed antenna has a small size of 12 × 18 mm2 while showing the band-rejection performance in the frequency band of 5.1/5.9 GHz. The bandwidth of proposed antenna is wider than the bandwidth of antenna in the references.

A novel planar inverted‐F antenna (PIFA) for WLAN/WiMAX applications

AbstractA novel planar inverted‐F antenna (PIFA) for WLAN and WiMAX applications is presented. The proposed antenna with small size of 24 × 3 mm2, consists of rectangular radiating patch with T‐shaped notch and a notched ground plane with rectangular slot which provides a usable fractional bandwidth of 4.95–5.91 GHz. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:649–652, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25762

Multiband ladder‐shaped monopole antenna for digital television and wireless communications

AbstractA multiband monopole antenna covering DTV and several popular wireless communications was presented. The antenna fed by a microstrip line comprises a ladder‐shaped patch and a notched ground plane. By precisely choosing the dimensions of both the patch and the ground, dual wide continuous impedance bandwidths of 880 MHz (0.51–1.39 GHz) and 1.66 GHz (2.11–3.77 GHz) applicable for multiband wireless operation can be easily achieved. Also, the monopole‐like type of radiation patterns and the average gains of about 0.1 and 4.5 dBi, respectively, over the lower and upper operating bands have been obtained. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2124–2127, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24555

Small Square Monopole Antenna for UWB Applications With Variable Frequency Band-Notch Function

In this letter, a novel printed monopole antenna (PMA) for ultrawideband (UWB) applications with variable frequency band-notch characteristic is presented. The proposed antenna consists of a stepped square radiating patch with two U-shaped slots and a notched ground plane with a T-shaped sleeve that provides a wide usable fractional bandwidth of more than 140% (2.8516.73 GHz). By cutting two modified U-shaped slots with variable dimensions on the radiating patch, frequency band-stop performance is generated, and we can control its characteristics such as band-notch frequency and its bandwidth. The designed antenna has a small size of 12 times 19 mm2 while showing the band rejection performance in the frequency band of 5.02-5.97 GHz.

A Study on Miniaturization of Printed Disc Monopole Antenna for UWB Applications Using Notched Ground Plane

In this paper, we report the detailed investigation of novel printed disc monopole antennas for ultra-wideband (UWB) applications focusing on miniaturization of the disc radiator. First, the basic property was examined for the case of a circular disc with diameter of 50mm, and it was found that the VSWR is less than 2 in the UWB band of 3.1-10.6 GHz when the feed gap length is between about -0.1 and 0.2mm. Next, in order to reduce the size of the disc radiator, various dimensions of elliptical discs were investigated. It is shown that if the dimensions of the elliptical disc are chosen appropriately, a smaller disc size antenna can be achieved. To decrease the antenna size further, a triangular notch and an exponentially curved notch on the ground plane of the antenna were examined. It is observed that the use of the notched ground is very effective and that the diameter of the circular radiator can be reduced to 17 mm. The proposed antenna has an omnidirectional pattern in the x-y plane. The influence of the notch on the radiation pattern is very small. Details of the simulation results using the FDTD method and experimental results for the proposed antenna are presented and analyzed. These features are very attractive for UWB applications.

Compact meander monopole antenna for tri‐band WLAN application

AbstractA novel printed meander monopole antenna for tri‐band wireless local area network (WLAN) applications is presented. The antenna is composed of a meander strip and a straight strip with a gap between the ends of them, both printed on an inexpensive FR4 substrate, and is fed by a 50 Ω microstrip feeder with the notched ground plane. The operation bandwidth of the proposed antenna covers 2.4, 5.2, and 5.8 GHz WLAN bands with light weight and compact radiator size of only 12 × 7 mm2. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 986–988, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22314

A small ultra-wideband planar tap monopole antenna with slit, tapered transition, and notched ground plane

In this paper, a planar tab monopole antenna is presented for broadband antenna design for ultra-wideband (UWB) applications. The impedance bandwidth of the antenna is improved by adding slit in one side of the monopole, introducing a tapered transition between the monopole and the feed line, and adding two-step staircase notch in the ground plane. The proposed antenna has a small size of 16 × 19 mm, and provides ultra-wide bandwidth from 2.8 to 22 GHz in order to satisfy the requirements of the current and future wireless communications systems. Low VSWR level and good radiation characteristics are obtained. Additionally, an inverted U-slot is embedded in the proposed antenna to avoid interference between UWB and WLAN systems. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1650–1654, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21693