Dual-band printed dipole antenna with parasitic element for WiMAX applications

Recently, wireless communication has grown exponentially worldwide. The wireless system that is currently popular is the Worldwide Interoperability for Microwave Access (WiMAX) system, which operates in the 2.5?2.7, 3.3?3.8 and 5.2?5.8 GHz frequency bands; the standard that defines interoperability across these bands is IEEE 802.16a/d/e/2004 [1]. Because of this, broadband and multiband antenna designs have become important in wireless applications. Recently, various antenna designs such as those of microstrip line, coplanar waveguide, and PIFA dipole antennas have been presented in the literature. In [2], a novel miniature end-loaded planar open-sleeve dipole (ELPOSD) antenna was presented; it was demonstrated to have a large bandwidth and a short length. A printed dipole antenna with U-slotted arms was proposed in [3]. With the aid of an embedded U-shaped slot, it can generate a new resonant mode at 5.2 GHz. In [4, 5], printed dipole and monopole antennas with parasitic elements were presented. The experimental results show that parasitic strips can be coupled with dipole antennas in order to give rise to additional resonance modes. A broadband printed dipole antenna with a stepshaped feed gap was proposed in [6]. The wide operating band is controlled by the different lengths of the radiation arms. Thus, it was demonstrated that a dipole antenna with parasitic elements has the ability to realise multiband or broadband operation.     

Feed for dual-band printed dipole antenna

A dual-band printed dipole antenna is proposed for WLAN applications in the 2.4 and 5.2 GHz bands. A spur line was etched on the arms of the printed dipole to achieve the dual-band operation. The printed dipole antenna with a simplified matching network is proposed. The novel simplified feed structure consists of a pair of parallel metal strips printed on the opposite sides of the dielectric substrate and connected to a 50 /spl Omega/ microstrip line with a truncated ground plane. This feeding network does not require additional transition devices, such as a T-junction, power divider, tuning stub or microstrip-to-coplanar stripline balun.     

一种小型化双频天线的设计与分析

提出了一种小型化宽频带双频天线的设计。该天线由一个E形微带贴片和一个偶极子天线组合而成,产生高低2个频率,且低频段带宽可控。仿真的-10dB阻抗带宽分别为83MHz(2.4～2.485GHz)和812MHz(5.1～5.912GHz)。能够覆盖IEEE802.11b/g(2.4～2.483GHz)和IEEE802.11a(5.15～5.825GHz)工作频段,并对仿真结果进行了分析。同时给出的设计双频段宽带小型化天线的方法,可以对高低2个频段分开设计,对工程实践有一定的指导意义。     

Printed folded dipole array antenna with directional radiation for 2.4/5 GHz WLAN operation

A printed linear array antenna comprising three half-wave folded dipole elements with the first two elements operating in the 5 GHz band and the third one operating in the 2.4 GHz band for WLAN operation is presented. The array antenna provides directional radiation patterns with vertical polarisation for frequencies across both the 2.4 and 5 GHz WLAN bands, and the measured antenna gain is 3.5-3.7 dBi for the 2.4 GHz band and 4.5-5.0 dBi for the 5 GHz band.     

双频带巴伦馈电的宽带双频印刷偶极子设计

研究一种巴伦馈电双频印刷偶极子天线。为了使印刷偶极子天线工作在WLAN 频段,H 形状的缝隙开在偶极子两个臂上。优化无巴伦馈电的辐射单元,使得天线在回波损耗小于-10 dB 的情况下工作在2.4 GHz (2180-2750 MHz)和5.2 GHz (5040-5480 MHz)。为了展宽带宽,本文设计了一种改进的Marchand 巴伦,它能提供两个谐振点以增加阻抗带宽。通过优化辐射单元和双频带巴伦,设计了工作在2150-2750 MHz 和5050-6230 MHz 的印刷偶极子天线。设计公式在文章中已经给出,计算和测试结果吻合得很好。     

Dual-band monopole antenna with shorted parasitic element

A printed dual-band C-shaped monopole antenna with a shorted parasitic element is proposed. The proposed antenna can provide two separate impedance bandwidths of 156 MHz (about 6.4% centred at 2.45 GHz) and 2048 MHz (about 37% centred at 5.5 GHz), making it easily cover the required bandwidths for wireless local area network (WLAN) operation in the 2.4 GHz band (about 3.4% bandwidth required) and 5.2/5.8 GHz bands (about 13% bandwidth required). Furthermore, the proposed antenna shows a low-profile of 635 mm above the ground plane. Details of the proposed antenna design and experimental results are presented and discussed.     

Compact CPW-fed dual-band antenna

A novel coplanar waveguide (CPW) antenna is proposed for dual-band WLAN applications. It comprises a rectangular patch, a rectangular notch cut at the lower edge of the patch and a CPW transmission line. The rectangular patch together with the ground plane of the coplanar waveguide radiates at the lower frequency band, 2.4 GHz for IEEE 802.11b/g, while the rectangular notch resonates in the upper band, 5.2/5.8 GHz for IEEE 802.11a. The designed antenna is only 32 × 5 mm, which can provide stable omnidirectional radiation patterns with an average gain of 2 dBi in both the bands. The antenna is very compact and suitable for 2.4 and 5.2/5.8 GHz WLAN operations.     

加载EBG反射板的圆极化偶极子天线

本文介绍了一种通过加载电磁带隙结构(Electromagnetic band gap,EBG)反射板来辐射圆极化电磁波的偶极子天线。该EBG反射板由矩形单元组成7×5阵列,印制偶极子天线谐振中心频点是5.2GHz。从仿真结果看,该偶极子天线能够有效地辐射圆极化波,阻抗带宽达到了0.65GHz,极化带宽达到了0.13GHz,天线增益达到了7.8 d B。     

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.     

一种用于无线局域网的双频带印刷偶极子天线

介绍了一种运用于无线局域网的小型化印刷偶极子天线,它采用对偶极子两个臂开槽结构,使其获得双频带和小型化的特性。采用基于耦合馈电的巴伦馈电方式,使天线具有宽带匹配、结构简单、制作方便、易于集成到无线通信设备中的优点。仿真结果表明,在2.4 GHz和5.8 GHz两个频带的带宽分别为590 MHz(2.13~2.72 GHz约24.33%)和700 MHz(5.24~5.94 GHz约12.52%),而且方向图比较理想。该天线的主要优点是结构简单、体积小、低剖面、成本低、易共形,能够满足WLAN的需要。     

一种基于倒“T”形贴片结构的WLAN天线设计

提出了一种基体背面有电磁带隙结构的倒“T”形双频微带天线。研究发现该天线具有双频带特性,其双频工作频率分别为2.4 GHz和5.2 GHz,相应的带宽为805 MHz (2.099~2.944 GHz) 和831 MHz (4.568~5.409 GHz),增益达到3.1 dBi。仿真和测试结果基本吻合,表明该天线可以很好地满足WLAN工作频段标准要求,具有很好的应用前景。     

一种双对称U型槽加载的三频贴片天线

提出一种可应用在无线局域网系统中的双对称U型槽加载三频贴片天线。相对于单U型槽而言,加载对称U型槽所产生的频段具有更高的线极化纯度。以此为基础设计并制作出具有双对称U型槽结构的贴片天线。天线通过矩形贴片、外层对称U型槽以及内层对称U型槽3个结构的谐振实现2.4 GHz、5.2 GHz和5.8 GHz三频工作,3个频段的增益分别大于5.8 dB、4.8 dB和2.5 dB,各频段内交叉极化小于-20 dB,实测与仿真结果基本一致。     

一种用于WLAN/WiMAX的三频MIMO天线设计

介绍了一种用于WLAN(2.45 GHz,5.15~5.85 GHz)和WiMAX(3.50 GHz)3个频段的MIMO天线。该天线包含两个呈直角放置的E型单极子,使其产生3条耦合路径以获得3频特性。两个天线元间放置一个由接地面上凸起的T型隔离单元,降低了天线元间的耦合。仿真结果表明,该天线在其3个工作频段内的回波损耗＜-10 dB,且在工作频带内可获得15 dB的隔离度。     

WLAN双频印刷天线的设计

设计了一种应用于2.4GHz和5.8GHz无线局域网的双频天线。天线由4个印刷偶极子分别组成两对阵列而成,每一对阵列分别工作在各自的谐振频率上,从而实现双频。介质板背面印刷有巴伦进行耦合馈电。该天线具有结构简单、体积小、重量轻,成本低、易于集成等优点,适用于无线局域网系统。     

Printed compact dual band antenna for 2.4 and 5 GHz ISM band applications

A printed compact dipole antenna for dual ISM band (2.44 and 5 GHz) is presented. The proposed antenna fed by using a 50 /spl Omega/ coaxial line occupies a volume of 15/spl times/40/spl times/1 mm/sup 3/ (FR-4, permittivity 4.6). The impedance bandwidth for 10 dB return loss is about 400 MHz (from 2170 to 2570 MHz) at 2.4 GHz band and over 2300 MHz (from 4690 to beyond 7000 MHz) at 5 GHz band. The measured radiation gains range from 1.20 to 1.41 dBi at 2.4 GHz band and from 2.25 to 3.44 dBi at 5 GHz band, respectively.     

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     

Low cost microstrip-fed dual frequency printed dipole antenna forwireless communications

A low cost microstrip-fed dual frequency dipole antenna has been developed for personal communication network (PCN) and wireless LAN (WLAN) applications in the 2.4 and 5.2 GHz bands. The antenna radiates bi-directionally and has a double-sided structure to enable transition from a balanced planar stripline to unbalanced microstrip line. The 10 dB bandwidths achieved were 18.75 and 7.7% at 2.4 and 5.2 GHz, respectively     

新型圆环嵌套多频印刷天线

提出了一种具有多频特点的新型圆环嵌套印刷天线,该天线由不同直径的圆环嵌套得到。通过电磁仿真软件CST Microwave Studip进行仿真研究,结果表明嵌套圆环的外径、宽度和嵌套数目可以对其通频带中心频率、频带宽度和通频带数目进行控制。设计出了具有2．4GHz,3．5GHz,5．2GHz,5．8GHz四个通频带的共面波导馈电的单极印刷天线和以平衡微带线馈电的对称振子天线。制作了天线实物并在微波暗室中进行测试,测试结果与仿真吻合较好,该天线具有近似独立的频率可控性和较小的尺寸,可用于WLAN和WiMAX等领域。     

Dual-band twin stepped-patch monopole antenna for WLAN application

By using twin stepped-patch radiators and a protruded ground, a micro-strip-fed monopole antenna with wide dual-band operation can be obtained. The proposed antenna with an overall size of 32 times 25 mm can excite resonances at the 2.61 and 5.52 GHz bands with impedance bandwidths of 710 MHz (2.32-3.03 GHz) and 1.56 GHz (4.77-6.33 GHz), average antenna gains of 2.9 and 3.5 dBi, respectively, and also monopole-like radiation patterns. These properties make the antenna suitable for 2.4/5.2/5.8 GHz WLAN applications.     

ACS-Fed e-Shaped Dual Band Uniplanar Printed Antenna for Modern Wireless Communication Applications

A printed small size (12×16.5 mm) ACS-fed e-shaped uniplanar antenna is proposed for dual band applications. The multiband operating characteristics have been achieved by integrating e-shaped radiating strips to the 50ΩACSfeed line. Two simultaneously operating wide bands have been generated by using optimized radiating branch strips for the multiband applications. For obtaining size reduction and wider impedance bandwidth, e-shaped meandered elements are chosen in the design. The proposed design features the bandwidth (VSWR < 2, reflection coefficient below–10 dB) of 100 MHz in 2.4–2.5 GHz, and 2100MHzin 4.0–6.1 GHz. The developed multiband antenna can be useful for several wireless communication applications, such as 2.4 GHz Bluetooth/RFID,WLAN(2.4/5.2/5.8 GHz), WiMAX (5.5 GHz), US public safety band (4.9 GHz), ISM band, radio frequency energy harvesting and internet of things (IoT) applications.