一种用于GPS接收机的微带天线设计

利用传输线模型和腔模理论设计了一款用于通信、导航、定位等领域的小型化、单个探针馈电的GPS微带天线,该天线工作在GPS第一载波L1（1．575GHz）,并给出了详细的设计过程。采用陶瓷介质材料和在正方形辐射元上切角的方式分别实现了天线设计的小型化和右旋圆极化。通过软件仿真分析表明,该天线整体尺寸比普通GPS微带天线减小...     

基于对称哑铃型的双圆极化微带天线设计

小型化和宽轴比带宽是双圆极化天线设计领域的研究热点。文章设计了一款馈电结构简单,天线尺寸较小的双圆极化微带天线。天线利用同轴电缆双端口馈电,在介质板上下两层对称分布的两个哑铃型贴片,分别辐射右旋圆极化(RHCP)波和左旋圆极化(LHCP)波。在天线的基础上,添加寄生贴片,通过天线互耦作用,改善了天线的匹配和增益情况。经仿真分析,此天线实现了48%的工作带宽和13%的轴比带宽,具有工作频带宽,可实现双圆极化,结构简单以及尺寸小型化的特点。     

GPS中的微带天线的分析方法

本文研究了一种新型的ＧＰＳ圆极化天线。利用导线网模型和镜象原理对该天线进行理论分析和计算，得出的方向图、轴比和增益均与实测数据很好地吻合，从而证实了该方法的正确性。     

基于HFSS的小型圆极化GPS微带天线设计与仿真

设计了一种GPS小型圆极化微带方形贴片天线。通过表面开槽的方法来减小天线尺寸和提高天线的整体性能,达到小型化的目的。通过切角的方法实现天线圆极化的工作方式。利用HFSS仿真软件对天线的各项参数做了具体的优化分析,给出了各个参量变化对天线性能的具体影响,对以后进一步研究双频或多频圆极化天线具有一定的参考意义。设计的GPS微带天线比同频下圆极化微带天线尺寸减小了20%,S₁₁参数在中心频率1.575 GHz处为-17 dB,频带宽度和轴比都有所提高,满足GPS的应用要求。     

一种小型超宽带微带天线

给出了一种小型化超宽带微带天线,该天线采用微带线对半圆形和矩形组成的阶梯状辐射单元进行馈电,基板背面为相似形缺陷地结构窗口。天线参数采用电磁仿真软件CST进行仿真和优化。所设计的小型化超宽带微带天线相对带宽达144.9%(2.15～13.47GHz),带内回波损耗均在-10dB以下,整个工作频段内天线的增益平均在4dB以上,天线的辐射方向图形状在频带内基本保持不变。该天线具有结构紧凑和形状简单的特点,易于加工和集成。最终实际制作了天线样品,并进行了测试,实测数据与仿真结果吻合良好。实验结果表明该微带天线具有良好的小型化和超宽带特性。     

基于左手介质的小型微带天线

用左手材料设计一种宽频带并且电尺寸小的微带天线,先用开口谐振环和金属杆设计出左手材料,并把它放在微带天线的基板中,利用左手材料的相位补偿特性实现了宽带微带天线的小型化设计。数值仿真结果表明,工作于10．5GHz时,加载了左手材料的微带天线的物理尺寸被大大减小了,天线尺寸从下降到0．21λ,突破了传统微带天线的半波长限制,并且相对带宽增加了5．31％,实现了微带天线的小型化设计。     

端口封闭式小型微带天线及其空腔模型分析

微带天线在各种内置天线通讯系统中有非常重要的应用.为满足便携式设备小型化的需要,该文提出一种端口封闭式微带贴片天线.此结构把微带天线的部分辐射端口用铜箔封闭,强行使磁壁变为电壁,从而改变了空腔内部电场,天线的辐射频率变低,使得微带天线的尺度大大减小.文中给出了天线的详细设计结构,并用空腔理论对不同封闭形式的微带天线进行了全面的理论分析.仿真结果与理论分析基本一致.同时仿真结果证明该设计天线的增益完全可以满足工程要求.     

小型多馈源宽频微带天线分析与设计

本文着重研究了提高轴比带宽的方法。从多馈源实现圆极化的机理出发,从理论上分析证明了采用多馈源技术可有效展宽轴比带宽。在小型微带贴片天线上,设计馈电网络,采用探针馈电,为贴片提供等幅、相位相差90°的激励,形成圆极化。仿真及实测结果表明,这种天线与单馈点天线相比,展宽了轴比带宽,提高了低仰角不圆度指标。     

基于CRLH的小型化三频LTE微带天线设计

研究了一种基于复合左右手传输线理论(CRLH)的小型化三频长期演进(LTE)微带天线,利用CRLH的零阶谐振特性,实现微带天线的小型化,仿真结果显示微带天线的3个工作频段分别为1 840~1 860 MHz,2 130~2 160 MHz,2 620~2 660 MHz。准确覆盖频分双工(FDD) LTE规划的Band3,Band4和Band7,整个天线的电尺寸仅为0.17λ。最后通过对微带天线进行加工实测,验证了仿真的准确性和有效性。多频小型化天线不仅可以大幅节约基站的天馈资源,而且可以有效降低基站建设的成本,该方案具有很强的工程实用价值。     

一种小型宽带宽波束圆极化微带天线设计

介绍了一种小型宽带宽波束圆极化微带天线设计。该天线采用双层短路贴片,通过旋转结构设计结合多点馈电技术,实现了微带天线的宽带宽波束圆极化辐射。仿真与测试结果表明：VSWR〈2的阻抗带宽为15.9%（1.45～1.7 GHz）,半功率波束宽度和3 dB轴比波束宽度在8.6%（1.45～1.58 GHz）的频带内均大于100°,天线尺寸仅为0.43λ×0.43λ×0.035λ。     

A compact fractal microstrip antenna for GPS and terrestrial radio services

The multi-band frequency operation is a property that antennas, utilized in several communication systems, have to exhibit. In this paper, a compact printed antenna for Global Positioning System (GPS) and terrestrial radio services is presented. It is composed via the union of four inverse Koch fractal patches. The antenna operates in three frequency ranges (GPS, Digital Cellular System-DCS1800 and 2.7?GHz). It is driven by two feed probes, directly matched to the radiating element without any matching network to be necessary. At GPS, the antenna is capable of generating a circularly polarized field, with maximum strength at the broadside direction. At the other two frequencies, the field is linearly polarized and the maximum of radiation appears apart from the broadside. Two pins, embedded in the structure, are activated at DCS and at 2.7?GHz in order to enhance the performance of the antenna.     

Miniaturised microstrip antenna for MMIC applications

A novel miniaturised quarter wavelength, H-shaped antenna which will find applications in monolithic microwave integrated circuit (MMIC) design is presented. The antenna occupies approximately one tenth of the substrate area of a half wavelength patch antenna. The effect on the resonance frequency, bandwidth and gain of the antenna are reported     

Reduced-size microstrip patch antenna for Bluetooth applications

A novel reduced-size microstrip rectangular patch antenna for Bluetooth operation is presented. The proposed antenna operates in the 2400-2484 MHz ISM band. Although an air substrate is introduced, the antenna occupies a small volume of 33.3/spl times/6.6/spl times/0.8 mm. The gain and the impedance bandwidth of the antenna are predicted using a commercial finite-element method software package. The predicted results show good agreement with measured data.     

Wideband single layer microstrip antenna for array applications

A wideband single layer microstrip antenna, fed by two different networks, is presented. A bandwidth of ~15% for SWR<2 is obtained. As its dimensions are the same as those of a conventional 2×2 sub-array, this radiating element can be used in array configuration     

Dual-band dual-polarised microstrip antenna array for SAR applications

A novel dual-band dual-polarised microstrip antenna array for synthetic aperture radar applications with a dual-frequency ratio of about 1:3 is presented. Microstrip dipoles and square patches are used as the radiating elements at S- and X-bands, respectively. The measured bandwidth of VSWR<2 reaches 8.9% and 17% for S- and X-bands, respectively. The measured cross-polarisation levels are <-26 dB for the S-band and <-31 dB for the X-band     

A Chaucer microstrip fractal antenna for mobile applications

In this paper a Chaucer fractal patch antenna integrated with split ring structure is simulated using Ansoft’s (HFSS), as well as fabricated and tested using VNA. The obtained results indicate that the proposed antenna resonates at 2.4 GHz in the ISM band. In addition, the structure offers multi-band operation with the fair value of return loss, gain, and bandwidth, impedance and directivity in the entire range of frequency operation.     

一种应用于WLAN/WiMAX的双频微带天线

提出了一种适用于WLAN/WiMAX的小型化双频微带天线。在矩形辐射贴片表面加载2/5形缝隙,改变矩形辐射贴片表面电流路径,使电流有效路径增加,实现天线的双频特性。通过电磁仿真软件HFSS 15.0对天线模型进行仿真分析。结果表明,天线可同时工作于WiMAX2.60 GHz和WLAN5.15 GHz频段,低频段和高频段的相对带宽分别为4%(2.53~2.64 GHz)和6%(5.14~5.48 GHz),最大增益分别为4.47 dB和1.35 dB,能够满足WLAN和Wi MAX的通信需求。天线整体辐射性能良好、结构简单、容易集成于前端电路。     

CP microstrip antenna with wide beamwidth for GPS band application

This paper presents a technique developed for increasing the beam width of the circularly polarised (CP) radiation. With a pyramidal ground structure and a partially enclosed flat conducting wall adopted the designed CP patch antenna has a height of about 0.121 only and exhibits a 3 dB axial-ratio beamwidth of more than 130deg. The experimental results for operating in the 1575 MHz GPS band are presented and discussed.     

Compact circularly polarised microstrip antenna design for dual-band applications

The design of a novel single-fed circularly polarised antenna dedicated for dual-band operations is presented. It is realised by integrating a dual-band dual-fed patch antenna with a dual-band branch-line coupler in a compact multi-layer structure. Measured impedance bandwidths of 20.1% (895 MHz) and 8.9% (2.397 GHz) are achieved.     

A compact high gain microstrip antenna for wireless applications

In this article, we describe a novel type of defective ground surface (DGS) microstrip antenna that achieves higher gain, multi resonant frequency with compact size. The proposed antenna consists of a hexagonal shaped patch with small volume. Six triangular slots have been cut on the ground plane, just below the six corners of the hexagonal radiating patch. Antenna is circularly polarized one and it has the measured peak gain of 7.2 dBi. The antenna shows multi frequency behavior and more than 57% compactness compare to the conventional hexagonal patch antenna. The simulated results are confirmed experimentally. The proposed antenna is simple in structure compared with the regular stacked or coplanar parasitic patch antennas. It is highly suitable for wireless communications.