基于并行LC谐振器的FSS结构在多频段应用中资源-CSDN文库

89 浏览量 2021-03-12 00:09:05 上传评论收藏 2.6MB PDF 举报

这篇文章讨论了基于并行LC谐振器的频率选择表面（FSS）结构在实现多频带滤波响应方面的应用。FSS是一种周期性结构，它能够为入射电磁波提供滤波响应。文章提出了一种新的FSS结构设计，其核心元件是并行LC谐振器，该谐振器由垂直连接的金属线和并联板电容器（PPC）实现。基于并行LC谐振器的FSS单元具有单带通滤波响应。通过引入具有不同谐振频率的多个垂直连接金属线（VCMLs）和PPC，提出的FSS结构能够提供多频段性能。并行LC谐振器的使用导致了单元格尺寸的缩小，例如，单带FSS元件的尺寸仅为工作波长的4.8%。由于并联板电容器带来的紧凑谐振器设计，这种FSS结构天然具备了单元尺寸微小的特性。此外，此类FSS结构还允许在不同极化条件下独立控制频率性能，有利于所需谐振频率的高效优化设计，并且能容易地实现宽带宽比范围内的多频带响应。例如，对于双带FSS，宽带宽比范围可以从1.13到3.32。文章进一步建立FSS的等效电路模型，以便解释其共振机制，并精确模拟频率性能。文章中还制作和测量了双带和三带FSS的原型。测量结果表明，在不同的极化和入射角度（高达60度）下，这些FSS原型展现了稳定的滤波性能。文章所讨论的内容涉及以下几个核心知识点： 1. 频率选择表面（FSS）的基本原理和应用：FSS是一种能够对入射电磁波提供特定频率响应的周期性结构。它在无线通信、雷达罩、高阻抗表面、电磁屏蔽和吸收器等领域有着广泛的应用。 2. 并行LC谐振器的设计与实现：文章介绍了一种基于并行LC谐振器的FSS单元设计，其结构包括垂直连接的金属线和并联板电容器。这种设计可以实现具有单带通滤波响应的FSS单元。 3. 多频带性能的实现方法：通过引入具有不同谐振频率的多个并行LC谐振器，能够构建出具有多频带滤波性能的FSS结构。 4. 单元尺寸微小化：并联板电容器的应用使得所提出的FSS结构能够实现小型化的单元尺寸，这使得FSS在小型化和集成方面具有显著的优势。 5. 频率性能的独立控制：该结构允许在不同极化条件下独立控制频率性能，从而实现复杂的滤波特性。 6. 等效电路模型的建立与应用：为了更深入理解共振机制和准确模拟频率特性，文章中建立了FSS的等效电路模型。 7. 实验验证：文章通过制作双带和三带FSS的原型，并对其进行了测量，验证了该结构在不同条件下的稳定滤波性能。这些知识点对于理解多频带FSS在无线通信等领域的应用具有重要意义。通过这种设计，FSS能够在有限的空间内实现对多个频段的精确控制和过滤，大大提高了设备的性能和效率。

资源推荐

资源详情

资源评论

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 65, NO. 10, OCTOBER 2017 5257

An FSS Structure Based on Parallel LC Resonators

for Multiband Applications

Peng-Chao Zhao, Zhi-Yuan Zong, Member, IEEE,WenWu,Senior Member, IEEE,

Bo Li, and Da-Gang Fang, Life Fellow, IEEE

Abstract—An frequency selective surface (FSS) structure

based on parallel LC resonators is proposed to achieve multi-

band bandpass ﬁltering responses. The parallel LC resonator,

implemented by a via-connected metallic line and a parallel-

plate capacitor (PPC), serves as the basic element for intentionally

constructing FSS unit cell, which exhibits a single-band bandpass

ﬁltering response. As a result, the proposed FSS structure

can provide a multiband performance by introducing multiple

VCMLs and PPCs with different resonance frequencies. Because

of the compact resonator resulting from a PPC, the proposed

FSSs feature miniaturized unit cell size inherently, for example,

the single-band FSS element is as compact as 4.8% of the

operating wavelength. Moreover, this kind of FSS structure is also

beneﬁcial for independent control of the frequency performance

under different polarizations, efﬁcient optimal design of desired

resonance frequencies, and easy realization of multiband response

with wideband ratio range (e.g., 1.13 to 3.32 for the dual-

band FSS). Equivalent circuits of these FSSs are established for

explaining the resonating mechanisms and precisely modeling the

frequency performances. Finally, prototypes of the dual- and tri-

band FSSs are fabricated and measured. The measured results

exhibit stable ﬁltering performance under different polarizations

and incidence angles (up to 60°).

Index Terms—Frequency selective surfaces (FSSs),

miniaturized-element, multiband, parallel LC resonator.

I. INTRODUCTION

REQUENCY selective surface (FSS) is a kind of peri-

odic structure, which provides the ﬁltering response

for the incident electromagnetic waves [1]. Over the

past several decades, FSSs have been intensively inves-

tigated for their widespread applications such as hybrid

radomes, high-impedance surfaces, electromagnetic shields,

and absorbers [2]–[5]. With the increasing demands on

the multifrequency components for wireless communication,

multiband FSSs have attracted growing attentions.

The common approaches for realizing multiband FSSs can

be summarized as: 1) fractal structures [6], [7]; 2) perturbation

Manuscript received January 11, 2017; revised July 2, 2017; accepted

July 30, 2017. Date of publication August 3, 2017; date of current version

October 5, 2017. This work was supported by the National Natural Sci-

ence Foundation of China under Grant 61401230. (Corresponding author:

Zhi-Yuan Zong.)

P.-C. Zhao, Z.-Y. Zong, W. Wu, and D.-G. Fang are with the School

of Electronic and Optical Engineering, Nanjing University of Science and

Technology, Nanjing 210094, China (e-mail: zongzhiyuan@sina.com).

B. Li is with the School of Electronic Science and Engineering, Nanjing

University of Posts and Telecommunications, Nanjing 210003, China, and

also with the State Key Laboratory of Millimeter Waves, Southeast University,

Nanjing 210096, China.

Color versions of one or more of the ﬁgures in this paper are available

online at http://ieeexplore.ieee.org.

Digital Object Identiﬁer 10.1109/TAP.2017.2735461

of a single-band FSS [8], [9]; 3) multiresonant structures, such

as concentric loops [10], [11], composite elements [12], [13],

and complementary patterns [14], [15]; and 4) multilayered

structures [16], [17]. Although the above-mentioned FSSs

can provide the dual- or tri-band performance, the band

ratios of their operation frequency bands and unit cell sizes

are strongly restricted by their speciﬁc element shapes. For

example, concentric loops are incapable of achieving closely

spaced operation bands because of fabrication limitation of

the gaps between these loops. In the case of fractal structures,

an octave separation between the operating bands is generally

presented. Moreover, because the unit cell size of the existing

designs is compared to half wavelength, harmonic resonances,

and grating lobes may appear in the operating band when

the band ratios are large. To address these problems, a 3-D

FSS with two independent transmission paths is proposed to

achieve dual-band performance with arbitrary band ratios [18].

Nevertheless, compared with conventional planar FSSs, this

FSS is polarization limited and suffers from complicated

structure and heavy weight.

In this paper, a kind of miniaturized FSS structure based

on parallel LC resonators is presented to achieve bandpass

performance. The parallel LC resonator is implemented by

a via-connected metallic line (VCML) and a parallel-plate

capacitor (PPC), acting as the parallel L and C, respectively.

Then, the single-band bandpass performance for both TE and

TM polarizations is obtained by symmetrically arranging two

identical parallel LC resonators. Similarly, the multiband band-

pass performance can also be obtained by introducing multiple

parallel LC resonators in each FSS unit cell. By properly

designing the operating frequency of each resonator, a wide

range of band ratios can be realized. The equivalent circuit

analysis method is introduced for better understanding and

precisely modeling of the proposed FSS designs. Finally,

to validate our design concept, prototypes of the dual- and

tri-band FSSs were fabricated and measured. The measured

results are in good agreement with the simulated ones.

II. P

ARALLEL LC RESONATOR

A. Design Concept

It is well known that a parallel LC resonator can provide

a single-band bandpass ﬁltering response. When a number of

the resonators are connected in series, multiband performance

can then be achieved. In this paper, we intend to construct

a resonator operating as a parallel LC circuit, and then

See http://www.ieee.org/publications_standards/publications/rights/index.html for more information.

5258 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 65, NO. 10, OCTOBER 2017

Fig. 1. Geometry and equivalent circuit of the parallel LC resonator.

this resonator is used as the basic element for intentionally

constructing an FSS unit cell.

Fig. 1 shows the implementation and equivalent circuit

of the proposed parallel LC resonator, which consists of a

VCML and a PPC. The VCML contains two printed metallic

lines together with a metallic via. It produces an equivalent

inductance of L = 2L

,whereL

is the inductance of each

metallic line. The inductance of the via is ignored because

the substrate we used is very thin. The PPC consists of two

metallic patches printed on both sides of the substrate, and

an equivalent capacitance C is formed between these two

patches [20]. Therefore, as indicated in Fig. 1, the proposed

resonator operates as a parallel LC circuit between nodes a and

b. Moreover, since the PPC, as compared with the conventional

planar slot, can provide larger capacitance [19], this parallel

LC resonator is compact and applicable for constructing the

miniaturized-element FSSs.

B. Performance of the Proposed VCML and PPC Array

Fig. 2(a) shows an array of the proposed parallel LC

resonators, which is composed of VCMLs and PPCs. In this

array, the periodically arranged resonators are connected along

the y-axis through the metallic lines and vias. Because of

this special arrangement, the resonators could be excited by

the TE polarized incidence, and thus leading to bandpass

performance. The TE polarized incidence causes the voltages

between two periodic boundaries in x-direction and these

voltages are added to the resonators, for example to nodes

a and b of a resonator as shown in Fig. 2(a), through the

connecting lines and vias. Similarly, when the resonators are

connected along the x-axis, the bandpass ﬁltering response

could be achieved for TM polarization. To validate this design

concept, frequency performance of this array is simulated by

using a full-wave electromagnetic ﬁeld solver CST-microwave

studio (MWS) incorporated with periodic boundary condition,

and the transmission coefﬁcients are presented in Fig. 2(b).

It can be observed that for TE polarization under normal

incidence, the desired bandpass performance is achieved at

= 2.45 GHz, and a transmission zero at f

= 3.33 GHz

is introduced by the connecting lines and vias. Whereas,

the bandpass ﬁltering response is not obtained for TM polar-

ization because the parallel LC resonators in this array are

not excited by the TM-polarized incidence. In this design,

the substrate has the relative permittivity of ε

= 3.55 and

the thickness of h = 0.2 mm. The gap and line widths are

g = 0.2 mm, w = 0.2 mm, and w

= 0.2 mm. All vias

Fig. 2. Geometry and frequency performance of a resonator array.

(a) 3-D view of the array (2 ×2). (b) Transmission coefﬁcients under normal

incidence.

possess the same diameter of 0.3 mm, and the square patches

in contact with the vias possess the side length of l = 0.6 mm.

It should be mentioned that these parameters deﬁned above

are applicable for all the FSS designs presented in Section III.

The other geometrical parameters of this array are deﬁned as

D = 5.4 mm, l

= 3 mm, l

= 2.4 mm, and s = 4 mm.

Fig. 3(a) illustrates the distributions of the electric ﬁeld

and surface current at the resonance frequency f

under TE

polarization. It can be seen that the electric ﬁeld vectors are

mainly in the normal direction and concentrated between the

patches of the PPC, and thus forming a capacitor. The surface

currents are mainly distributed along the metallic lines of

VCML, which indicates that VCML operates as an inductor

as expected. For this array, because the equivalent impedance

of the parallel LC resonator Z

= 1/( jωC + 1/jωL) trends

to inﬁnity at the resonance frequency f

= 1/(2π

√

LC),

connecting metallic lines are equivalently opened at the nodes

of the resonators, and thus leading to the undistributed surface

currents along the connecting lines as shown in Fig. 3(a).

However, even though there are no currents along the connect-

ing lines at resonance, they are indispensable for adding the

voltages to the resonators at both nodes. With these voltages,

the resonators are excited.

To precisely model the frequency performance of the array

shown in Fig. 2(a), an exact equivalent circuit model is further

剩余9页未读，继续阅读

评论收藏

内容反馈

weixin_38609765

粉丝: 5
资源: 942

基于并行LC谐振器的FSS结构在多频段应用中

基于并联LC谐振器的选频吸收器设计

基于FSS结构的太赫兹双频陷波滤波器的研究

基于中心对称弯曲带谐振器的选频吸收器设计

具有紧密频率稳定性的双频FSS，可用于多频通信

具有几何可分离的曲折线电感器和平行板电容器的FSS结构

使用级联多层环路阵列的三频段，高选择性，带通FSS

LC并联回路在高频线路中的应用

基于高介电常数陶瓷谐振器的全介电材料频率选择表面

基于多层石墨烯的频选表面的微波吸波器设计

具有互吸收带透明窗和叉指谐振器的选频吸收器

基于高介电常数陶瓷谐振器的全介电超材料频率选择表面

并联谐振在电路中的应用

FSS.rar_fss文件共享

关于LC并联谐振的问题

论文研究-具有宽入射角与极化不敏感性的电控Jerusalem缝隙型FSS结构的仿真分析及馈电网络设计 .pdf

基于PHP的FSS私密文件分享及传递工具源码.zip

ansoft designer 用于fss仿真

简述LC并联谐振回路

CST 的FSS仿真

网页滑动jquery fss 支持链接

文件共享软件（FSS）

L频段紧凑型FSS的研究与设计-综合文档

Finite Antenna Arrays and FSS.rar )

基于BP神经网络矩形微带天线谐振频率预测.pdf

FSS仿真模型

串联LC回路

FSS介绍文档整理汇总与更新

最新资源