Surface-mountable EMC monopole chip antenna for WLAN operation

A novel surface-mountable monopole chip antenna having an electromagnetic compatibility (EMC) property is presented. In addition to the radiating strip on the chip base of the antenna, a ground portion is added on the side surfaces of the chip base. The antenna ground portion is to be grounded to the system ground plane of the mobile device for practical applications. The antenna ground portion can function as an effective shielding wall between the antenna and the nearby electronic components in the device. In this case, the nearby components can be placed in close proximity to the antenna, with small effects on the antenna performances. That is, the proposed antenna is EM compatible with the nearby components. In addition, the proposed antenna is surface-mountable onto the system circuit board of the mobile device, which reduces the packaging cost of the device. The proposed antenna applied to a smart phone or Personal Digital Assistant (PDA) phone for WLAN operation in the 2.4 GHz band is studied in the paper.     

Internal Ultrawideband Monopole Antenna for Wireless USB Dongle Applications

A novel, ultrawideband (UWB) monopole antenna suitable to be mounted on the printed circuit board (PCB) of a wireless, universal, serial-bus (USB) dongle as an internal antenna is presented. The proposed antenna in the study is a U-shaped, metal-plate monopole antenna, easily fabricated from bending a simple metal plate onto a foam base of a compact size of 6times11times20 mm³. The antenna mainly comprises a pair of wide-ended radiating arms and a bevel-feed transition. When the antenna is mounted at the top portion of the PCB, one end of the radiating arm is also short-circuited to the system ground plane. With the proposed antenna structure, which can provide a very wide operating bandwidth of larger than 7.6 GHz, the antenna impedance bandwidth can easily cover the 3.1-10.6 GHz UWB band. Details of the antenna design are described, and experimental results of the constructed prototypes are presented and discussed     

Shorted, folded planar monopole antenna for dual-band mobile phone

A novel shorted, folded planar monopole antenna for application in GSM/DCS dual-band mobile phones is proposed. The antenna is easily fabricated from stamping a single metal plate, which is then folded onto a foam base of compact size 5/spl times/10/spl times/40 mm/sup 3/. In addition, the proposed antenna shows a very low profile of 5 mm protruded from the top edge of the system ground plane, making it very promising to be employed within the casing of a mobile phone as an internal antenna.     

一种应用于WLAN的抗金属四频段平面单极天线设计

用于非金属外壳设备的常规天线与金属外壳设备一起使用,会导致完全不同的回波损耗。因此,提出了一种同时适用于金属外壳和非金属外壳设备的四频段平面单极天线,该天线由一个弯曲接地层、一对寄生贴片和由同轴馈电激发的辐射片组成。提出的天线能够在不同类型接地层影响下,保持其谐振频率一致性,甚至能够连接到金属外壳上。该天线适用于在WLAN 2.4/5.2/5.8 GHz、WiMAX 3.5/5.5 GHz和4.5GHz工作的多种应用。仿真和实际测量结果显示,即便是连接到较大的金属外壳或金属板时,提出天线能够较好地保持回波损耗和增益一致性且符合行业标准。     

Compact patch antenna mountable above conducting plate for wlan operation

A compact patch antenna suitable for mounting above a conducting plate for WLAN operation in the 2.4 GHz band is presented. It is demonstrated that, by introducing a supporting metal plate connected to the antenna ground below, the proposed antenna in free space can easily be mounted at the corner of a conducting plate of various dimensions without rapidly deteriorating the antenna bandwidth. With a compact size of 20times20times6 mm, the antenna can be placed very close to a conducting plate of side length varied from 20 to 200 mm for application in a PC peripheral device     

多频共面波导馈电平面开式套简天线研究

提出了一种同时支持诸多频带工作的共面波导馈电平面开式套筒天线.共面波导中心金属导带以及接地板均采用渐变的形状,天线采用开式套筒结构,并加入了一个倒L型寄生贴片,以最大程度地展宽天线带宽.与以往所提出的共面波导馈电天线相比,此天线具有尺寸小,覆盖更宽的频带,可同时支持个人通信系统(PCS),宽带码分多址系统(WCDMA)...     

Compact vertical patch antenna for dual-band WLAN operation

A new compact patch antenna, which is arranged perpendicular to a circular ground plane, for WLAN operation is presented. The antenna consists mainly of one driven patch and one shorted parasitic patch, both of which wind along two concentric circles. A constructed prototype covering the 2.4 and 5 GHz WLAN bands is demonstrated. Good broadside radiation characteristics are obtained across the operating bands. Details of the proposed patch antenna and experimental results are presented and discussed.     

Double MOS Loaded Circular Microstrip Antenna with Airgap for Mobile Communication

A novel model of a wide frequency range double MOS loaded circular microstrip patch antenna with airgap between ground plane and substrate is proposed. In this structure two metal oxide semiconductor (MOS) devices are loaded on the patch to enhance the operating frequency range of antenna. To investigate the antenna, different parameters such as resonance frequency, input impedance, frequency agility, VSWR, radiation pattern etc. are calculated and simulated. The resonant frequency of proposed 10 mm radius patch is upward shifted from 5.2 to 6.8 GHz using 1 mm airgap and by loading MOS, antenna can be tuned down to 1.27 GHz operating frequency, which leads to compactness and tunability of antenna. Proposed antenna can be tuned between 1.27 and 6.8 GHz frequency of operation which makes the antenna highly suitable for wide frequency range of mobile communication. The proposed double MOS loaded antenna possessed 82.94 % frequency agility. The antenna is worth for GPS, WLAN, UMTS, and WiMAX operations.     

Wideband stubby monopole antenna for mobile phone

A novel stubby monopole antenna fabricated using a single metal plate is presented. A prototype of the proposed antenna with a cross-sectional area of 10/spl times/10 mm and a length of 20 mm is implemented, and the antenna shows a wide operating bandwidth of about 10.9 GHz, making it easy to cover the UMTS band and the 2.4/5.2/5.8 GHz WLAN bands for mobile/WLAN dual-mode operation of a mobile phone.     

Triple-frequency planar monopole antenna for side-feed communication device on GSM/DCS/PCS operation

A novel side-feed planar monopole antenna capable of triple-frequency operation at about 900, 1800 and 1900 MHz is presented. The planar monopole antenna occupies a small area of 6/spl times/31 mm, and is easily made using thin copper. The planar monopole antenna can be side-fed and mounted perpendicularly to the main circuit board of a communication device so that it offers a novel design with a free degree of feed point so as to save device space, resulting in a low profile to the system ground plane. In addition, the obtained impedance bandwidths of the proposed antenna at about 900, 1800 and 1900 MHz can cover the GSM (890-960 MHz), DCS (1710-1880 MHz) and PCS (1850-1990 MHz) bands.     

Multiband Printed Monopole Slot Antenna for WWAN Operation in the Laptop Computer

A multiband printed monopole slot antenna promising for operating as an internal antenna in the thin-profile laptop computer for wireless wide area network (WWAN) operation is presented. The proposed antenna is formed by three monopole slots operated at their quarter-wavelength modes and arranged in a compact planar configuration. A step-shaped microstrip feedline is applied to excite the three monopole slots at their respective optimal feeding position, and two wide operating bands at about 900 and 1900 MHz are obtained for the antenna to cover all the five operating bands of GSM850/900/1800/1900/UMTS for WWAN operation. The antenna is easily printed on a small-size FR4 substrate and shows a length of 60 mm only and a height of 12 mm when mounted at the top edge of the system ground plane or supporting metal frame of the laptop display. Details of the proposed antenna are presented and studied.      

Subtraction of edge-diffracted fields in antenna radiation patterns for simulation of infinite ground plane

A measurement technique is introduced to simulate the radiation pattern of an antenna mounted on an infinite sized ground plane. The edge diffracted fields from a finite ground plane are measured and then subtracted from the total field to yield only the direct radiation from the antenna that would be present if the antenna were mounted on an infinitely large ground plane. Comparisons with theory are also presented.<>     

Conformal Antennas on Liquid Crystalline Polymer Based Rigid-Flex Substrates Integrated With the Front-End Module

Recent developments in liquid crystalline polymer (LCP)-based processing technology have shown that highly-integrated, fully-packaged radio-frequency (RF) front-end modules with high-performance can be designed by using the system-on-package (SOP) approach. However, the direct integration of a large antenna element to a small module package still remains an issue. This paper presents a novel conformal antenna structure, which results in a compact integration of the antenna and the module package for 5 GHz WLAN/WiMAX applications. The extension of 5 GHz single-band operation to 2.4/5 GHz dual-band operation is also discussed in this paper. The antenna is an inverse L-shaped monopole printed on a 25-$mu{hbox {m}}$-thick flexible LCP layer, which protrudes from a rigid multilayer organic substrate. The shielding effects of a grounded metal case, which can house the associated module circuitry, are also considered during the design process. The metal case serves as a vertical ground plane for the antenna in addition to protecting the module circuitry from the near-fields of the antenna. The flexible LCP substrate can be bent and folded over the module case, resulting in a compact design and the tight integration of the antenna with the front-end module. The details of the design and the fabrication of the proposed structure as well as the simulation and the measurement data are presented in this paper.      

Switched WLAN-wideband tapered slot antenna

A switched band antenna that has a capability to operate in dual-band WLAN mode (2.4-2.485 GHz and 5.725-5.875 GHz), a single band WLAN mode of 2.4-2.485 GHz and a wideband mode (2.2-7.2 GHz) is presented. The antenna is based on a tapered slot antenna, which has a defected ground structure containing two switchable ring and two rectangular slots to provide a switched band property. Measurement results on a prototype antenna, with an ideal switch, fully demonstrate the performances of the proposed designs. The proposed antenna is suitable for use in a base station or an access point for WLAN and wideband applications and may be also useful in future multimode radio systems.     

Stubby monopole antenna for UMTS/WLAN dual-mode mobile phone

A novel stubby monopole antenna for mobile phone applications is presented. The antenna is easily fabricated by bending a single metal plate. Further, the antenna shows a wide operating bandwidth of about 6 GHz (about 1.7-7.8 GHz), making it easy to cover the UMTS band and the 2.4/5.2/5.8 GHz WLAN bands for mobile/WLAN dual-mode operation of a mobile phone     

A Pentagonal Shaped Microstrip Planar Antenna with Defected Ground Structure for Ultrawideband Applications

A new compact pentagonal microstrip patch antenna with slotted ground plane structure, developed for use in ultrawideband applications, is studied in this article. The proposed antenna is mainly constituted by a pentagonal shaped patch antenna, a defected ground plane structure, two stubs, and four slots to improve the bandwidth. The designed antenna has an overall dimension of 30?×?17.59?×?1.6 mm³, for WIMAX/WLAN/WiFi/HIPERLAN-2 /Bluetooth/LTE/5G applications with a very large bandwidth starting from 2.66 to 10.82 GHz (S₁₁?<???6 dB). A parametric study of the ground plane structure was carried out to find the final and the optimal UWB antenna, and to confirm that the antenna has good performance and broader bandwidth. The proposed antenna prototype has been fabricated. The measured results indicate that the antenna has a good impedance matching. The antenna has an electrically small dimension with a good gain, a notable efficiency, and a wide impedance bandwidth, which makes this antenna an excellent candidate for ultrawideband wireless communication, microwave imaging, radar applications, and the major part of the mobile phone frequencies as well.

     

Surface-mount dual-loop antenna for 2.4/5 GHz WLAN operation

A surface-mount dual-loop antenna suitable for dual-frequency WLAN operation is presented. For achieving dual-frequency operation with a compact size, the antenna comprises two loop strips of different sizes printed on a flexible printed circuit board, which is then bent and attached onto a foam base of compact size. The antenna shows an attractive feature of high antenna gain, about 4 and 5 dBi for frequencies across the 2.4 and 5 GHz WLAN bands, respectively.     

一种双陷波超宽带天线设计与研究

为了避免如WiMax和WLAN等窄带通信系统对超宽带通信系统的影响,该文提出一种具有双陷波特性的超宽带天线。该天线采用圆形贴片作为辐射单元,通过在贴片和接地板上分别开圆弧状的H形槽和L形槽来实现双陷波特性。天线在3.1~10.6 GHz的超宽带频段内能够有效地工作并抑制两种不同的窄带通信系统的干扰。同时圆弧状H形槽的参数研究表明,这种开槽结构能够以槽参数组合的形式更有效地控制陷波中心频率。实测和仿真结果吻合,该天线实现了良好的陷波功能,在工作频段内有良好的辐射方向特性。     

Broadband Dielectric Resonator Antenna With Metal Coating

A broadband dielectric resonator (DR) antenna is proposed, which consists of a rectangular DR coated with metal on three sides and placed on a ground plane. The structure is analyzed by modelling the dielectric-air interface as perfect magnetic conductor (PMC). A coplanar waveguide (CPW) with terminating slots is used to feed the antenna. Measurement results exhibit a wide bandwidth of about 47% over which the E_thetas pattern on the horizontal plane is nearly omnidirectional. The 10-dB bandwidth of this broadband DR monopole covers 4.2-6.8 GHz. Hence, it can be used for WLAN 802.11a applications     

A compact triple-band dual-element MIMO antenna with high port-to-port isolation for wireless applications

In this literature, a compact planar triple-band multiple input multiple output (MIMO) antenna with two monopole elements is presented. Each element includes a defective complementary open-loop resonator (COLR), two slots on both sides of the feedline, two stepped stubs and a monopole ground plane. This structure operates in the frequency bands of 2.22–2.54 GHz, 3.14–3.9 GHz and 5.3–5.7 GHz for WiFi, WiMAX and WLAN applications, respectively. The antenna is not based on a common ground plane, so antenna is low cost and compact. High measured isolation is achieved which is better than 34 dB in all operating bands without using additional decoupling structure. An equivalent circuit model is proposed to investigate the behaviour of the antenna. The envelope correlation coefficient of antenna is less than 0.001 and diversity gain is about 10. The proposed MIMO antenna is fabricated and there is a good agreement between the experimental measurements with the simulation results.