Design of implantable CPW fed monopole H-slot antenna for 2.45 GHz ISM band applications

In this paper, the design and radiation performance of the novel miniature implantable coplanar waveguide fed H-slot antenna for embedded in human body operating in the ISM band frequency is proposed. A parametric model of a skin, fat and muscle implantable antenna is designed and a prototype is fabricated on biocompatible alumina ceramic substrate (ɛ_r = 9.8 and thickness = 0.65 mm) and it is tested. Antennas are further analyzed in inside a pork tissue and human body phantom liquid. Results indicate strong dependence of the exhibited radiation performance (radiation pattern, gain, specific absorption rate and quality of communication with exterior instruments) on design parameters and operating frequency. The proposed antenna design methodology can be applied to optimize antenna for several implantation scenarios and ISM band applications.     

Dual-polarised CPW-fed microstrip antenna for wireless applications at 2.45 GHz

The design and fabrication of a dual-polarised microstrip antenna fed by two coplanar waveguides (CPWs) for operation at 2.45 GHz are presented. Obtained results show an impedance bandwidth of 44.3 MHz using a single layer of substrate. The simulated return loss for both polarisations is less than -35 dB, and the isolation between the ports of the antenna is better than 21 dB.     

一种应用于ISM频段的共面波导型可植入式天线

为了满足目前可植入式医疗设备对天线小型、宽带、频率性能稳定的需求,提出一种新型医疗频段(ISM)可植入式天线,天线具有阶梯形状的对称结构,共面波导馈电。采用立方体形状的人体模型填充肌肉,天线置于人体中心部位,仿真设计天线覆盖医疗频段(ISM),分析了天线处于胃、小肠、皮肤等组织材料中仍能够覆盖ISM频段。在配制的模拟人体肌肉溶液中对天线进行测试,带宽为2.02～2.5 GHz。天线尺寸4 mm×11.9 mm×0.8 mm,采用FR-4材料,与目前已有的可植入式天线相比,天线具有体积小、带宽宽、制作成本低等优点,可应用于心脏起搏器、胶囊内镜等可植入式医疗设备。     

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.     

一种ISM频段半切共面波导可植入天线

提出一种以柔性材料为衬底的新型可植入天线,天线初始结构为对称状共面波导天线,对此天线在对称面进行切半得到半切共面波导天线。采用HFSS在单层人体模型中对半切天线进行设计与分析,仿真结果表明天线在不同人体组织中会产生频率偏移,但在皮肤、肌肉、小肠中均能覆盖工业、科学和医疗频段(ISM)。仿真结果还显示天线在改变衬底厚度的情况下仍具有宽的带宽。对天线进行加工,采用猪肉馅和果冻状模拟皮肤分别对天线进行测试,其|S11|<-10 dB的带宽分别为1.91~2.65 GHz与2.19~2.79 GHz,天线在2种环境中的测试带宽均能覆盖ISM频段,天线尺寸为6 mm×13.5 mm×24 mm。将天线与圆柱体共形,在肉馅中测试带宽为2.26~3.11 GHz,与目前已有天线相比,本文天线具有尺寸小、质量轻、带宽宽的特性,可应用于胶囊内视镜、无线心脏起搏器等可植入医疗器件中。     

Design of microstrip offset feed circular polarised nearly squarepatch antenna operating at 2.45 GHz

It is shown that, as the feed of a nearly square patch is offset away from the corner feed position, the ratio of the two dimensions of the patch increases to maintain the circular polarisation condition. Consequently, with an offset feed, the effect of manufacturing errors on the performance of the antenna is reduced     

Analysis and design of an inverted-F antenna printed on a PCMCIAcard for the 2.4 GHz ISM band

The development of small integrated antennas plays a significant role in the progress of rapidly expanding commercial communication applications. This paper addresses the analysis and design of an inverted-F antenna (IFA) printed on a PCMCIA card. The antenna is compact, easy to manufacture, and efficient, with an omni-directional pattern and a bandwidth of 250 MHz. The performance of the integrated IFA/PCMCIA system was simulated using two commercial method of moments codes, and validated with measurements on a fabricated prototype     

面向RFID应用的几种2.45 GHz微带天线的分析比较

随着RFID的广泛应用,微带天线已经成为RFID中不可缺少的一部分,常见的微带天线有单偶极子和双偶极子天线。根据目前RFID的应用,提出了几种基于2.45 GHz的板载天线,同时结合天线的基本理论对这几种结构进行了分析,并通过HFSS软件进行仿真比较。通过对仿真结果的分析,讨论了各种微带天线的优缺点,为RFID的应用提供了参考。     

2.45CHz ISM频段上WLAN和WPAN共存问题的研究现状

伴随2．45CHz ISM频段上无线局域网(WLAN)和无线个人局域网(WPAN)技术发展而来的是共存问题，该文在介绍了WLAN和WPAN技术的发展进程之后，探讨了以IEEE 802．11b和蓝牙为代表的WLAN和WPAN之间的共存问题及当前已提出的解决方案。     

A planar UWB antenna with signal rejection capability in the 4-6 GHz band

The design of a compact planar antenna featuring ultra wideband performance and simultaneous signal rejection in the 4-6 GHz band, assigned for IEEE802.11a and HIPERLAN/2, is presented. The design is demonstrated assuming RT6010LM substrate with a relative dielectric constant of 10.2 and thickness of 0.64 mm. The presented results show that the designed antenna of 27 mm /spl times/ 20 mm dimensions has a bandwidth from 2.7 GHz to more than 10 GHz excluding the rejection band. The antenna features near omnidirectional characteristics and good radiation efficiency.     

Highly sensitive, co-optimised active receiver antenna: its use in Doppler radar in 2.4 GHz ISM band

A novel design methodology is presented to co-optimise an active receiver antenna, combining a planar rectangular ring antenna and a low noise amplifier, operating from 2.4 to 2.485 GHz. A Doppler radar experiment based on this active antenna illustrates the excellent noise performance resulting from this approach.     

Miniature PIFA without empty space for 2.4 GHz ISM band applications

A novel miniature planar inverted-F antenna (PIFA) design without empty space is presented for 2.4 GHz ISM band applications. The antenna fabricated on an FR4 substrate has an overall size of only 10 (L) x 3 (W) x 3.5 (H) mm³ to be embedded inside the portable devices. By properly adding a shorting pin and etching a bent slot, the operating frequency of the antenna can be lowered more flexibly. Moreover, owing to no additional empty space, the circuit routing on the PCB is permitted underneath and around the antenna. The impedance bandwidth of the antenna is about 160 MHz from 2.39 to 2.55 GHz. Good omnidirectional radiation pattern with appreciable gain across the band can be obtained so that the proposed antenna is suitable for Bluetooth and WLAN applications.     

基于5GHz无线频段的环形OAM微带阵列天线设计

频谱资源短缺和频谱利用率低已成为阻碍无线通信技术与物联网发展的重要因素,轨道角动量(OAM)作为一种可用于无线通信的新技术,引起了人们的广泛关注。文中提出一种基于5 GHz无线频段的环形OAM微带阵列天线,并设计了由物理长度可变移相器和U型移相器构成的馈电网络。解释了辐射阵元间馈电相位差的具体实现,分析了阵列天线的相关性能参数。仿真结果表明,阵列天线辐射出的OAM波束具有明显的螺旋相位波前结构,能够产生稳定的OAM涡旋电磁波。此阵列天线结构简单且易于加工,对解决未来无线电通信系统中信道容量需求与频谱资源短缺的矛盾具有一定的参考价值。     

Dual-band slot-coupled dipole antenna for 900MHz and 2.45 GHz RFID tag application

A slot-coupled dipole antenna is presented for dual-band passive RFID tag application. A structure using a slot-coupled feed is explored to achieve dual-band operation. The proposed antenna shows good impedance and radiation characteristics for both bands of interest. The simulated and measured return loss results are in good agreement. Reasonably good radiation characteristics are obtained for 900 MHz and 2.45 GHz RFID bands     

Compact CPW-fed monopole antenna for 5 GHz wireless application

A compact and simple coplanar waveguide (CPW)-fed monopole antenna for 5 GHz wireless communication is proposed. By properly adjusting the lengths of both the monopole strip and the inverted L-shaped ground, the designed antenna, with, including ground plane, only 9/spl times/9.5 mm/sup 2/, can operate at the desired 5.2 or 5.8 GHz band. The electromagnetic coupling effect between the radiating strip and the ground on excitation of the resonant mode has been studied. Prototypes of the proposed antenna have been constructed and experimentally studied. Measured results show a -10 dB impedance bandwidth and an average antenna gain of 400 MHz and >6 dBi, respectively.     

57 GHz Gaussian beam antenna for wireless broadband communications

The radiation characteristics of a millimetre wave Gaussian beam antenna (GBA) have been investigated theoretically and experimentally. The antenna consists of a fused-quartz half-wavelength piano-convex Fabry-Perot resonator fed by pyramidal horn. Very low sidelobe levels (<-35 dB) and a fairly good efficiency (>50%) are obtained at 57.2 GHz. Such an antenna configuration is therefore suitable for wireless broadband communications     

4 Element compact triple band MIMO antenna for sub-6 GHz 5G wireless applications

Wireless Networks - A compact 4 element MIMO antenna operating in three Sub-6&nbsp;GHz 5G bands is proposed. The single element antenna consists of a square-shaped patch where circular and...     

Dual band dielectric resonator antenna for wireless application

The proposed technique is an integration of a slot antenna and a dielectric resonator antenna (DRA). This is designed without compromising miniaturisation and efficiency. It is observed that the integration of slot and dielectric structure itself may be merged to achieve extremely wide bandwidth over which the antenna polarisation and radiation pattern are preserved. Here the effect of slot size on the radiation performance of the DRA is studied. The antenna structure is simulated using the CST software. The simulated results are presented and compared with the measured result. This DRA has a gain of 7.1 and 6.3?dBi at 5.7 and 8.1?GHz, respectively, its 10?dB return impedance bandwidth of nearly 4.5% and 5.5% at two resonating frequencies. A total of 98% efficiency has been achieved from the configuration. It is shown that the size of the slot can significantly affect the radiation properties of the DRA and there are good agreements between simulation and measured results.