Aperture-coupled, differentially-fed planar inverted F antenna

A differentially-fed single aperture is used to excite an unsymmetrical antenna contactlessly. The current maximum below the aperture is generated by an odd-mode signal, rather than an open-circuit stub. Simulated and measured 0.9 GHz results, with a planar inverted F antenna, suggest potential applications in mobile communication systems.     

Dual-band planar inverted F antenna for GSM/DCS mobile phones

A compact dual-band planar inverted F antenna suitable for the application as a global system for mobile communication/digital communication system (GSM/DCS) dual-band mobile phone internal antenna is proposed and implemented. The proposed antenna has three resonant elements, two meandered metallic strips of slightly different lengths and one nearly-rectangular patch, which are printed on a supporting FR4 substrate and arranged in a compact configuration. These three resonant elements share a common shorting pin, and for the GSM (890-960 MHz) operation, the proposed antenna is operated with the two meandered strips both resonated as a quarter-wavelength structure, leading to a wide bandwidth formed by two resonant modes. For the upper band of the proposed antenna, three resonant modes are generated, two from the second higher-order modes of the two meandered strips and one from the nearly-rectangular patch, leading to a wide bandwidth covering the DCS band (1710-1880 MHz). The antenna design and experimental results are presented.     

Triple broadband compact planar inverted F antenna for WLAN and WiMAX

This article proposes a novel antenna structure by slot loading method based on the planar inverted F antenna(PIFA),which is fed by coaxial probe.The antenna structure consists of a new and flexible slot array including five slots.To reveal the mechanism of slot loading in creating new and broad frequency band,the article discusses the performance of the five slots in detail.Simulations with Ansoft HFSS 10.0 indicate that the -10 dB relative impedance bandwidth can reach 17.2 %,8.9 % and 12.1 % that covers ...     

超薄型PIFA天线研究

研究GSM手机PIFA在降低高度后如何进行设计,使之能在现代移动通信终端设备中应用。研究成果可以显著降低手机中天线的厚度,从而降低整机的厚度或者体积,进而使手机的结构和外观变化余地更大,获得更灵活的设计,给用户以更为强烈的第一视觉冲击,增加产品在市场上的竞争力。     

Planar inverted F antenna loaded with high permittivity material

Enhanced gain of an inverted F antenna loaded with a very high permittivity substrate has been demonstrated. Measurements show that the size of the antenna can be reduced without sacrificing the antenna radiation efficiency. The gain-enhancement mechanism, bandwidth, and antenna radiation gain and patterns are presented and discussed     

Triple band planar inverted F antennas for handheld devices

Two novel triple band planar inverted F antennas (PIFAs) are presented. The first antenna is realised by housing a dual frequency L-shaped spur line loaded PIFA element within the lower resonance PIFA element. The second antenna is realised by embedding two single element PIFAs within a quarter-wave patch. For both antennas, an isolation of better than -15 dB between the feed ports and a good agreement between simulation and measurement results was obtained     

一款基于HFSS仿真的倒F蛇型印制天线

设计了一种用于2.4 GHz智能无线传感器的倒F蛇型天线,.使用HFSS仿真和设计,根据优化后的天线模型参数,最终设计集成在无线传感器印制电路板上印制天线,使天线可达到最佳的效果.该天线的仿真和实测结果表明,在2.45 GHz的中心工作频率下,回波损耗小于-12dB,带宽约为100 MHz,阻抗50.58+j0.55,满足了IEEE 802.15.4协议的要求.     

A new inverted F antenna with a ring dielectric resonator

A new antenna combining the use of a ring dielectric resonator (DR) and an inverted F antenna (IFA) is proposed and investigated experimentally. In this application, the DR not only fills the role of a dielectric coating, but also serves the function of a radiator. The measurements of input impedance, return loss, and radiation pattern for both the IFA with the DR (IFA-DR) and the wire IFA (WIFA) are conducted at the S band. The measured data demonstrate that the IFA-DR operates in multiple resonance modes unlike a WIFA. Compared with the WIFA, the one proposed here incorporating a ring DR and an IFA is more attractive in having a smaller size and a larger impedance bandwidth     

Micromachined inverted F antenna for integration on low resistivity silicon substrates

This letter addresses the integration of a 24-GHz inverted-F antenna on a low resistivity silicon substrate, using micromachining post-processing techniques compatible with commercial Si/SiGe active device processes. By suspending the radiator on a 2.4mm/sup 2/ large polymer membrane an on-chip antenna with -0.7 dBi gain has been realized.     

Tunable dual-band planar antenna

A dual-band antenna design that covers the 2.26-2.54 GHz and 5.14-6.10 GHz bands is presented. The proposed antenna design consists of two patch radiators suspended above a ground plane. The performance in the lower and upper bands can be controlled with less mutual coupling effect. The antenna also features less beam squinting of the radiation patterns at boresight for both operating bands.     

Dual-frequency planar inverted-F antenna

Cellular telephone handsets are now being designed to have dual-mode capabilities. In particular, there is a requirement for internal antennas for GSM and DCS1800 systems. This paper describes a novel planar dual-band inverted-F antenna for cellular handsets, which operates at the 0.9-GHz and 1.8-GHz bands. The dual-band antenna has almost the same size as a conventional inverted-F antenna operating at 0.9 GHz and has an isolation between bands of better than 17 dB. The bandwidths of the antenna are close to those required for the above systems. Good dual-band action is also obtained for other frequency ratios in the range of 1.3-2.4. Studies also show that the dual-band antenna can operate with one or two feeds. A finite-difference time-domain analysis has been shown to give calculated results close to those measured     

Balance-fed planar built-in antenna

A planar built-in antenna with a balance-fed configuration, denoted a balance-fed planar inverted-F antenna (BPFA), has been developed for the IMT-2000, third-generation (3G) mobile communication system. The BPFA features balanced operation, which leads to a significant reduction in the current induced on the telephone body and therefore the absence of any significant effect caused by the operator's hand     

宽带平面单极天线

提出了一种宽带平面单极天线,其辐射单元为底部具有斜切角的矩形铜片,馈电点偏离辐射单元的中心位置,斜切角和不对称馈电的应用有效地扩展了带宽.用Ansoft HFSS软件对天线尺寸、斜切角和馈电点位置等参数对天线特性的影响作了分析,给出了这些参数的最佳值,并根据这些最佳参数制作了天线样机.以电压驻波比小于3.5:1为标准,实测得到的天线带宽为70～3000 MHz.电压驻波比和方向图的测量结果与仿真结果吻合较好.     

超宽带平面天线技术

对近年来发展的超宽带平面天线技术进行了综述,依次介绍了超宽带平板单极天线、超宽带印刷单极天线和超宽带印刷缝隙天线的进展,并作了比较.最后也介绍了具有带阻功能的超宽带印刷天线..     

A planar log-periodic antenna

A planar log-periodic antenna structure that has radiation characteristics similar to those of a half-wave dipole has been found. The bandwidth can be as large as desired, and antennas can be easily fabricated by using printed circuit techniques. When fed with a suitable balun, VSWR's lower than 1.8:1 can be obtained over a wide-frequency band.     

Dual-frequency planar antenna for handsets

Cellular telephone handsets are now being designed to have dual-mode capabilities. In particular, GSM and DCS1800 modes are used in Europe. And PCS and AMPS modes are used in the USA. A novel planar dualband internal antenna for handsets which operates in the ~0.9 and 1.8 GHz bands is proposed. The dualband antenna has almost the same size as a conventional internal antenna operating in the 0.9 GHz band. Good dual-band operation was obtained for frequency ratios in the range 1.3-2.7     

A new planar grating-reflector antenna

A planar grating-reflector antenna with frequency-scanning properties is presented. The antenna system is composed of a point feed and a planar reflector consisting of a frequency-scanned reflection grating. The grating geometry must be selected such that the first higher-order diffracted wave propagates and serves as the frequency-scanned beam. A focus feed position for the diffracted field is obtained by allowing the lattice geometry to vary along the reflector surface. Methods for analyzing and designing the new antenna configuration are presented. The antenna concept is demonstrated theoretically and experimentally by the design, evaluation, and test of an experimental antenna operating over the frequency band 9.5-10.5 GHz     

Compact wideband planar monopole antenna

When a shorting pin is added to the planar monopole antenna, an additional mode is excited below the fundamental mode. By optimising the dimensions. A compact wideband antenna can be constructed. The size reduction achievable for this antenna is ~50% compared with an equivalent planar monopole without a shorting pin. Owing to its compact size and wideband performance, this antenna is suitable for use in existing and future mobile communication terminals     

Radial line planar monopulse antenna

In recent years, mobile satellite communications have been growing rapidly. Monopulse tracking operations for beam pointing to the satellite are often employed for those systems which, in general, require rather severe EIRP and G/T specifications. Thus, the development of a monopulse antenna with a good antenna efficiency is of great interest. A radial line planar monopulse antenna is proposed. An analysis of the probes in a radial line has been carried out which gives an understanding of why the monopulse patterns can be synthesized, and a simple and effective theory is presented about a realization of uniform-aperture field distribution. The antenna has been fabricated and the radiation characteristics have been measured which supports the theory as well as verifies the capability of the antenna for the monopulse tracking operation     

A broadband planar quasi-Yagi antenna

A novel broadband planar antenna based on the classic Yagi-Uda dipole array is presented. This "quasi-Yagi" antenna achieves a measured 48% bandwidth for VSWR <2, better than 12 dB front-to-back ratio, smaller than -15 dB cross polarization, 3-5 dB absolute gain and a nominal efficiency of 93% across the operating bandwidth. Finite-difference time-domain simulation is used for optimization of the antenna and the results agree very well with measurements. Additionally, a gain-enhanced design is presented, where higher gain has been achieved at the cost of reduced bandwidth. These quasi-Yagi antennas are realized on a high dielectric constant substrate and are completely compatible with microstrip circuitry and solid-state devices. The excellent radiation properties of this antenna make it ideal as either a stand-alone antenna with a broad pattern or as an array element. The antenna should find wide applications in wireless communication systems, power combining, phased arrays and active arrays, as well as millimeter-wave imaging arrays.