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.     

应用于WLAN和WiMAX的双频带印刷天线设计

提出了一种新型的用于WLAN/WiMAX通信系统的双频带印刷单极天线。通过改进的叉子形的辐射贴片,使天线在2.4 GHz频带内谐振。同时,在介质基板背面的引入寄生辐射贴片,利用与正面的辐射贴片的耦合效应,使天线谐振在5 GHz频带内。最终使得天线可以覆盖2.4/5.2/5.8 GHz WLAN 和5.5 GHz WiMAX频带。对加工后的天线模型测试表明,天线在工作频带内具有较好的全向辐射特性和可观的增益。因此,该天线在无线多频带通信系统中具有广泛的应用前景。     

Metal-plate 1/spl times/2 array antenna for 5.2/5.8 GHz WLAN operation

A novel metal-plate 1/spl times/2 array antenna constructed easily from a single metal plate and suited for WLAN operation in the 5.2/5.8 GHz bands (5150-5350/5725-5875 MHz) is presented. The metal-plate array antenna comprises two radiating elements series-fed by a 50 /spl Omega/ microstrip line and excited in phase, leading to a high antenna gain level (>4.0 dBi) for frequencies across the 5.2/5.8 GHz WLAN bands.     

一种新颖的应用于无线局域网的小型化单极子天线

给出了一个新颖的三频工作的单极子天线,并可以应用于无线局域网。这个天线由对称结构和地板组成,它们分别印刷在介电常数为4.4、厚度为1.6 mm 的FR4 介质板的两面,并且采用微带线的馈电方式。这个天线有着小型化尺寸26 mm×20 mm×1.6 mm。测量结果显示,低频和高频的-10 dB 阻抗带宽分别为2.3-2.5 GHz 和4.7-6.8 GHz;这个 带宽覆盖了2.4/5.2/5.8 GHz 无线局域网工作频段。同时得到了较好的全向方向图。这个天线的低频和高频的平均增益分别为2dBi 和3.7dBi。     

Compact dual-band antenna for wireless access point

A compact dual-band printed antenna covering the 2.4 GHz (2400-2485 MHz) and 5.2 GHz (5150-5350 MHz) WLAN bands is presented. The experimental analysis shows a 2:1 VSWR bandwidth of up to 32 and 8% for 2.4 and 5.2 GHz, respectively. The measured radiation patterns are nearly omnidirectional, with moderate gain in both the WLAN bands.     

Design and realization of low profile dual-wideband monopole antenna incorporating a novel ohm (Ω) shaped DMS and semi-circular DGS for wireless applications

In this paper, a compact microstrip line fed dual-wideband printed monopole antenna (PMA) for wireless communication applications is presented. The proposed antenna consists of an asymmetric rectangular patch via a microstrip-fed line, an ohm (Ω) shaped DMS loaded at the rectangular patch, and dual semi-circular shaped DGS embedded in the partial rectangular ground plane. The combination of an ohm shaped DMS and two semi-circular DGS is used to broaden the bandwidth of the two bands and improve the return loss for the desired antenna. The measured 10 dB bandwidth for return loss are achieved to be 21.52% (3.40–4.22 GHz) and 47.32% (5–8.1 GHz) in the lower and upper band, respectively which covers the bandwidth requirements of 5.2/5.8 GHz WLAN and 3.5/5.5 GHz Wi-MAX application bands. Furthermore, the proposed antenna has a very simple planar structure and occupies a small area of only 621 mm² (23 mm × 27 mm). The proposed antenna has a desirable VSWR level, radiation pattern, radiation efficiency and gain characteristics which are suitable for wireless communication applications.     

Broadband microstrip antenna with U and T slots for 2.45/2.41 GHz RFID tag

A novel single-layer passive RFID tag antenna for the resonant frequency 2.45/2.41 GHz using a square microstrip patch with a pair of U and T slots is proposed, which is suitable for attaching to metallic objects. The proposed antenna was fabricated with a thin copper layer printed on a thin lossy FR4 substrate for low-cost production. The dimensions of the proposed antenna are around 35 times 35 mm. The antenna shows near-linear phase characteristics, 250 MHz bandwidth under the condition of voltage standing-wave ratio less than 2 and it covers all RFID microwave bands. The gain of the proposed antenna is 2.0 2.2 dBi for worldwide RFID microwave bands. Half-power bandwidth is about 108.     

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。     

A Microstrip Fed Patch Antenna with Two Parasitic Invert L Stubs for Dual-Band WLAN Applications

A novel microstrip fed dual-band design patch antenna with two parasitic invert L stubs for 2.4/5- GHz wireless applications is presented in this paper. Printed on a dielectric substrate of FR4 with relative permittivity of 4.4 and thickness of 1 mm, and fed by a 50Ω microstrip line, the patch antenna with two parasitic invert L stubs is demonstrated to generate three resonant modes to cover 2.4/5.2/5.8- GHz wireless local area network (WLAN) bands with satisfactory radiation characteristics. Experimental and simulated S parameters are presented. Parameters sweep and simulated radiation patterns are demonstrated.     

Compact microstrip-line-fed ring monopole antenna with tuning strip for 5 GHz WLAN operation

A novel compact and simple microstrip monopole antenna for 5 GHz wireless local area network (WLAN) operation is proposed. To excite a resonant mode in the operating band, a tuning strip is added to the antenna, which consists of a rectangular ring microstrip and a top loaded vertical strip, and is fed by a 50 /spl Omega/ microstrip line. The effects of the added strip to the impedance matching have been studied. A constructed prototype of the proposed antenna has been tested and bandwidth of about 930 MHz ranging from 5.03 to 5.96 GHz, monopole-like radiation pattern, and average gain of greater than 2.6 dBi over the operating band have been obtained.     

一种应用于手机中的WLAN三频带天线设计

设计了一种满足WLAN三频带工作所需的微带天线。该天线的尺寸为7.5 mm×19 mm,与其他设计比较具有尺寸小、结构简单、易于加工的优点。仿真和实测结果表明,设计的天线10 dB阻抗带宽完全覆盖WLAN的2.4 GHz、5.2 GHz、5.8 GHz三个频带,同时天线也具有良好的辐射特性。对WLAN三频带天线的设计进行描述。     

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。     

Compact Triple‐Band Monopole Antenna for WLAN/WiMAX‐Band USB Dongle Applications

A miniaturized triple‐band antenna suitable for wireless USB dongle applications is proposed and investigated in this paper. The presented antenna, simply consisting of a circular‐arc‐shaped stub, an L‐shaped stub, a microstrip feed line, and a rectangular ground plane has a compact size of and is capable of generating three separate resonant modes with very good impedance matching. The measurement results show that the antenna has several impedance bandwidths for of 260 MHz (2.24 GHz to 2.5 GHz), 320 MHz (3.4 GHz to 3.72 GHz), and 990 MHz (5.1 GHz to 6.09 GHz), which can be applied to both 2.4/5.2/5.8 GHz WLAN bands and 3.5/5.5 GHz WiMAX bands. Moreover, nearly‐omni‐directional radiation patterns and stable gain across the operating bands can be obtained.     

Compact Dual Band-Notched Monopole Antenna with Modified Radiating Patch for UWB Wireless Applications

Ultra-wideband (UWB) planar antennas with single or multiple notched frequency bands properties have recently been considered for various communications between wireless devices. In this study, a low profile microstrip monopole antenna with double band-filtering function is designed and investigated. FR-4 dielectric with properties of ε = 4.4 and δ = 0.02 has been employed as the antenna substrate. The configuration of the proposed design is composed of a modified fork-shaped radiating patch with inverted Ω-shaped slot and a pair of coupled Γ-shaped parasitic structures, a feed-line and a ground plane. The proposed dual band-notched UWB antenna provides good impedance bandwidth characteristic from 2.89 to 12.43 GHz for VSWR <2 with two notched bands which cover all the 5.2/5.8 GHz of WLAN, 3.5/5.5 GHz of WiMAX and 4-GHz of C bands ranges. The antenna provides good radiation behavior with sufficient gain levels over its operation frequency band.     

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.     

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。     

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。     

Multi-band monopole antenna with inverted U-shaped parasitic plane

A microstrip-fed printed monopole antenna having a parasitic plane is proposed for multi-band applications. By inserting an inverted U-shaped parasitic plane on the bottom of the dielectric substrate, the proposed antenna can easily cover DCS/UMTS/WiBro/2.4 GHz WLAN and 5.2/5.8 GHz WLAN bands at the same time. In addition, a /spl Gamma/-shaped slit is inserted on the main patch to cover the GSM frequency band. Experimental and numerical results of the designed monopole antenna are presented and analysed.     

Printed double-T monopole antenna for 2.4/5.2 GHz dual-band WLAN operations

A novel and simple printed dual-band double-T monopole antenna is proposed. The antenna comprises two stacked T-shaped monopoles of different sizes, which generate two separate resonant modes for the desired dual-band operation. The proposed antenna has a low profile and can easily be fed by using a 50 /spl Omega/ microstrip line. Prototypes of the proposed antenna designed for WLAN operations in the 2.4 and 5.2 GHz bands have been constructed and tested. Good radiation characteristics of the proposed antenna have been obtained. Effects of varying the monopole dimensions and the ground-plane size on the antenna performance have also been studied.     

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.