硅基微小Koch分形技术天线的设计和制作

采用微电子加工工艺在高电阻率硅片上设计和制备了微小双波段分形天线,测试得到天线基本为全向辐射,增益为2.5dBi,谐振频率分别为6.9GHz和21.7GHz,反射系数分别为22dB和32dB,此天线的设计制造利于IC集成.文章还重点对天线的制作工艺进行了详细地介绍,对于以后此类研究具有一定的参考价值.     

一种X波段波导缝隙天线的设计与仿真

给出了波导缝隙天线设计步骤,设计一种X波段波导缝隙天线,计算了天线口径、波导数量、缝隙的单元数量、宽度、位置等参数,设计半高波导宽臂耦合谐振缝魔T和差器,在此基础上完成了天线设计。仿真结果表明,当中心频率为12 GHz时,和波束增益为28.9 dB,第一副瓣电平为-22.2 dB,所设计的天线形式可获得较好的和、差波束方向图、电压驻波比和增益等参数。     

A novel design of circularly polarised antenna based on metamaterial

This article presents a novel design of circularly polarised microstrip antenna based on a metamaterial reflection plane and a half-wave antenna. The metamaterial is composed of two pieces of substrates coated on one side with split ring resonators. Both the experimental and simulated results show that good circularly polarised radiation performances are obtained. The 10?dB return-loss impedance bandwidth and 3?dB axial ratio bandwidth of proposed antenna are 12% and 7%, respectively, and the gain of proposed antenna compared with the half-wave antenna is improved from 6?dB to 9?dB in the design frequency range.     

一种THz频段高效光子晶体微带天线分析

对一款THz频段矩形微带贴片天线进行理论分析与设计,采用光子晶体带隙结构介质,通过对空气孔半径、孔距和微带线宽度的扫频分析,微带天线获得最佳传输性能。仿真结果显示天线的回波损耗从-19.45 dB降至-41 dB,驻波比(VSWR≤2)阻带带宽从3%增加至4.1%,最大增益天线辐射方向达到8.8 dB。仿真结果表明:光子晶体带隙结构能有效提高天线的传输效能。     

ALPSS: a millimetre-wave aperture-coupled patch antenna on asubstrate lens

The feasibility of millimetre-wave (MM-wave) aperture-coupled patch antennas, printed at the back surface of substrate-lenses is demonstrated and the corresponding radiation characteristics are investigated. A specific realisation of such an air-lens-patch-slot-strip (ALPSS) antenna on a low-permittivity ϵ _r=4.0 extended hemispherical lens substrate is theoretically and experimentally characterised at 70 GHz. It is demonstrated that the ALPSS antenna exhibits clean, axially symmetric patterns of low cross-polarisation (26 dB), a directivity of 30.4 dB and the 3 dB pattern full-beamwidth remains within 6°-5° between 60-80 GHz. In addition, a very-high front-to-back (F/B) ratio, of the order of 50 dB is measured at 70 GHz, despite the absence of a backing ground-plane. The ALPSS antenna is well suited for low-cost broadband point-to-point communications and collision avoidance applications     

一种基于MEMS工艺的新型THz喇叭天线的设计与仿真

提出了一种太赫兹(THz)天线结构:基于MEMS 工工艺的THz角锥喇叭天线.采用电磁场仿真软件Ansoft HFSS 11对所设计的天线进行仿真,结果表明该天线在2.5 THz ～3.5 THz范围以内具有回波损耗优于-25 dB,增益大于15 dB的良好特性.天线可以通过MEMS工艺(硅基KOH刻蚀)制造,具有加工...     

电小尺寸锥台上单馈圆极化共形导航天线阵设计*

在电小尺寸锥台上,设计并实现了一款工作于GPS L1 频点(1.575GHz)和北斗B1 频点(1.562GHz) 的锥台共形水平全向圆极化微带天线阵。采用HFSS 软件仿真,比较分析了锥台共形对贴片天线阵单元S11 、轴比、 增益等参数带来的影响,通过对辐射贴片尺寸调整,改善其圆极化性能,提高了圆极化增益。加工实物天线阵样机, 测试结果表明,该天线阵在1.556 ~1.578 GHz 频段内S11<=-10dB,在GPS L1 频点和北斗B1 频点处,水平全向增益 最大值分别为2.08dB 和1.19dB,增益不圆度小于2dB,实测结果证明该天线具有良好的水平全向圆极化辐射性能。     

基于复合腔结构的MEMS双模微带天线设计

设计了一种基于腔结构的双模偶极子天线,其频率在2.44GHz和4.38GHz,利用MEMS开关实现双波段的操作.根据偶极子天线原理,设计了单模微带偶极子天线,使用开关结构将两个单模偶极子天线连接在一起,实现了双模天线的功能.利用三维电磁场软件HFSS分析了设计结构,包括开关、天线,在0～10 GHz得出开关性能插入损耗在-1dB以下,天线回波损耗在-26dB以下.频率为2.44GHz时、回波损耗为-13.2dB、2dB的辐射效率为89%,频率为4.38GHz时,回波损耗为-21.9dB、3dB辐射效率为96%,带宽都在0.5GHz左右.     

Antennas and waveguides for far-infrared integrated circuits

Antennas and waveguides for the wavelength range 0.1-3 mm are considered. Emphasis is placed on those designs which lend themselves to integration with each other and with other components such as diodes. The general properties of FIR antennas are reviewed. A novel silicon waveguide antenna is discussed, and its design, simulation, fabrication, and performance at 119 μm are described. This antenna has a highly symmetrical, single-lobed beam with 3 dB beamwidths of 35 and 38° in theE- andH-planes, respectively. The gain (measured in microwave simulation) is 12.8 dB. This antenna is well suited for integration with Schottky diodes. The related subject of FIR waveguides is discussed. Experiments with metal transmission lines at 119 μm are described and dielectric guides related to the waveguide antenna are also considered. Using components such as these it may soon be possible to construct receiver front ends for this wavelength range in integrated-circuit form.     

Wideband planar inverted-F antenna with meandering shorting strip

A new wideband planar inverted-F antenna (PIFA) is introduced. The proposed antenna is based on a simple PIFA, where the shorting strip is modified into a meandering shape such that the antenna can have wideband characteristics. The antenna finds an impedance bandwidth of 45.2% for S11 < -10 dB from 1.565 to 2.48 GHz which can cover the GPS, DCS, IMT-2000, 2.4 GHz WLAN applications. The maximum antenna gains are 1.68, 1.83, 1.90 and 1.78 dBi correspondingly.     

A VHF Microstrip Antenna With Wide-Bandwidth and Dual-Polarization for Sea Ice Thickness Measurement

A VHF microstrip patch antenna was developed to achieve a bandwidth of 45 MHz (30%) from 127 to 172 MHz with dual-linear-polarization capability. This microstrip antenna, having a size of 117 cm times 117 cm times 27 cm, used low-dielectric-constant foam substrates and dual-stacked patches with capacitive probe feeds to achieve the required wide bandwidth. Four such capacitive feeds were used to achieve dual polarizations with less than -20 dB of cross-polarization level. Twenty-four shorting pins were uniquely used here on the lower patch to achieve 40 dB of isolation between the two polarization ports. This antenna has a measured gain of 8.5 dB at 137 MHz and 10.3 dB at 162 MHz. One advantage observed here at the low frequencies of VHF is that more electrical structures can be easily integrated into the microstrip antenna to improve its performance.     

基于超表面的低剖面高增益圆极化天线

提出了一种基于缝隙耦合超材料表面的低剖面圆极化高增益天线,该天线由一个超材料表面和一个微带缝隙天线紧贴着组成.通过改变超表面切角的大小来产生圆极化波,同时还可以提高天线增益和拓宽阻抗带宽.为了验证仿真结果,制作和测量了一个大小为1λ×1λ×0.067λ(在10 GHz处)的样本天线,仿真和测量结果显示出良好的一致性.结...     

An estimation method for the free-space antenna factor of VHF EMI antennas

A novel numerical method is developed for theoretically estimating the free-space antenna factor of an electromagnetic interference (EMI) antenna, especially for the very high frequency (VHF) range where traditional methods are difficult to apply. It requires conventional EMI antenna calibration such as the standard antenna method to obtain the antenna factor of an antenna under calibration as a function of the antenna height. Then, a nonlinear least-squares method is applied to the calibration results to estimate the free-space antenna factor. It is found that the proposed method can yield more accurate estimates of the free-space antenna factor than the averaging method. Attainable accuracy of this method is better than 0.2 dB for tuned dipole antennas and 0.1 dB for biconical antennas and biconi-log antennas. The paper outlines the theoretical background and the validity of this method, with the attainable accuracy demonstrated using method of moments simulations.     

一种宽带低剖面高增益低副瓣定向平板天线北大核心CSCD

研究设计了一款低剖面、宽带、高增益、低副瓣的定向平板天线。为了实现低剖面,采用了宽带微带天线单元、馈电网络等设计,定向天线整体采用印制板;为了实现低副瓣,采用阵列天线与馈电网络的一体化设计,用多层印制板加工技术实现天线单元间不等幅度的馈电精度,尽可能减少人工装配步骤,以降低装配误差。文中对设计的低副瓣定向天线进行了加工测试。测试结果表明,所研制天线的阻抗带宽为26.1%。在阻抗带宽范围内,可以实现最大增益大于23.6 dBi、E面和H面的副瓣电平分别小于-27.4 dB和-28.3 dB、前后比小于-42.2 dB。     

Active Frequency-Tune Beam-Scanning Leaky-Wave Antenna Arrays

X-band active beam-scanning leaky-wave antenna arrays, including 1 × 1,1 × 2 and 1 × 4 prototypes, have been demonstrated. These antennas integrated one or several microstrip leaky-wave antenna elements with a single varactor-tuned HEMT VCO as an active source. Measured results on experimental antennas indicate that the beam scanning angle of the 1 × 1 antenna close to 40° can be achieved and the scanning range of 1 × 2 and 1 × 4 antenna arrays are both close to 32°. Furthermore, reflected wave due to the open end of each leaky-wave antenna element has been suppressed by the symmetric configuration of this antenna array and the antenna efficiency increases. When comparing with the measured radiation pattern of the single element antenna, we found that the 1 × 2 and 1 × 4 antenna arrays can effectively suppress the reflected power by more than 5.5 dB and 10.5 dB, respectively, at 10.2GHz. The power gain are more than 2 dB and 3.16 dB higher than the single element antenna with a measured EIRP of 18.67 dBm.     

Broadband dual-polarized patch antennas fed by capacitively coupledfeed and slot-coupled feed

Designs of broadband dual-polarized patch antennas fed by promising feed structures of a capacitively coupled feed and a slot-coupled feed (antenna A), two capacitively coupled feeds of a 180° phase shift and a slot-coupled feed (antenna B), and two capacitively coupled feeds of a 180° phase shift and two slot-coupled feeds (antenna C) are proposed and experimentally studied. The first two feed designs are for the excitation of a single-element broadband patch antenna, while the last design is for a two-element broadband patch antenna. These proposed patch antennas have a thick air substrate, and the 10 dB return-loss impedance bandwidths obtained for the two polarizations are all greater than 13%. High isolation (<-30 dB for antenna A, <-32 dB for antenna B, <-35 dB for antenna C) between the two feeding ports for the entire impedance bandwidth of the proposed antennas can be obtained. Also, improved cross-polarization levels (>20 dB) in both E and H plane patterns for the two polarizations of antennas B and C are achieved     

Single- and dual-polarized millimeter-wave slot-ring antennas

Single- and dual-polarized dielectric lens-supported slot-ring antennas have been developed for operation at millimeter-wave frequencies. The antennas are fed with a coplanar waveguide (CPW) to be compatible with uniplanar mixers and low-noise amplifiers, and the feedline is shown to have a minimal effect on the antenna performance. The measured antenna patterns agree well with theoretical results and have symmetric main beams, low sidelobe levels (<-15 dB), low cross polarization (<-20 dB), and 27 dB directivity. A 2×2 array of single-polarized slot-ring antennas for monopulse applications demonstrates excellent patterns at 94 GHz with -3 dB crossover power levels in both elevation and azimuth scans. The dual-polarized slot ring antenna patterns are nearly identical to those of the single-polarized antenna, and two-port isolation is as low as -25 dB. The dielectric lens-supported slot-ring antenna is an excellent candidate for compact, low-cost millimeter-wave systems with fixed or variable polarization capabilities     

一种基于开口谐振环的高增益宽带双极化天线设计

该文设计并制作了一种基于超材料的高增益宽带双极化天线,该天线由两个正交放置的印刷振子单元、馈电巴伦及金属接地板构成。为了进一步展宽带宽、提高增益,在天线上了加载开口谐振环、互补开口谐振环等超材料结构。测试结果表明,该天线回波损耗小于-10 dB的带宽约为69%(0.98~2.01 GHz),在相同的频带内隔离度大于20 dB。由于开口谐振环的引向作用,天线的辐射特性得到改善,增益最大提高了4.1 dB左右。和已有设计相比,该天线的总体高度减小了约12%。其可以当作独立天线使用,也可用作反射面天线的双极化馈源。     

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.     

双层宽波束天线设计

针对宽波束天线在车载雷达中的应用,突破角雷达方位面3 dB波束宽度的限制,实现微带阵列天线在水平面的宽波束覆盖,设计了一款1×10串馈微带双层结构天线。线阵单元采用道尔夫-切比雪夫（Dolf-Chebyshev）综合法电流分布来达到降低天线俯仰面副瓣的效果,在串馈阵列上方加载寄生贴片和介质基板拓展天线方位面的3 dB波束宽度。分析了双层天线展宽波束的原理,加工并实测了双层宽波束天线,其方位面的3 dB波束宽度为134.6°,增益达到10.6 dB,副瓣电平为-19.8 dB,可以满足车载角雷达天线需求。