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首页宽带多服务室内分布式天线设计:带环形馈电的蝶形天线
宽带多服务室内分布式天线设计:带环形馈电的蝶形天线
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本文档主要探讨了一种专为多服务室内分布式天线系统(MS-IDAS)设计的宽带天线。在现代无线通信中,MS-IDAS因其在增强室内覆盖、提高信号质量和多服务支持方面的优势而变得尤为重要。这种宽带天线由一个环路加载偶极子、微带馈线线路以及平面反射器组成。环路加载结构的引入显著扩展了天线的工作频率范围,使其能够覆盖从880MHz到2700MHz的宽广频段。 设计的天线尺寸仅为180毫米x 150毫米x 50毫米,紧凑且适合室内环境应用。作者展示了这款原型天线在实际室内覆盖测试中的表现,结果显示它能在设计的宽频带内提供高质量的信号。这证明了该天线是MS-IDAS的理想候选者,对于满足商业中心、购物中心等场所的多服务需求具有很高的实用性。 论文指出,随着无线通信技术的发展,室内分布式天线系统的部署在快速增长,尤其是在大型公共场所。早期的系统着重于单一频段的覆盖,但随着对多服务需求的提升,宽带天线的设计变得更为关键。这款宽带偶极子天线正是针对这一趋势,旨在通过其高效的频谱利用率和良好的室内性能,提升无线通信的整体效率和用户体验。 总结来说,这项研究对无线通信领域的室内覆盖解决方案进行了深入探讨,特别是在多服务场景下。宽带天线的设计不仅考虑了频谱扩展,还兼顾了小型化和易部署的特点,对于推动IDAS技术的进一步发展具有重要意义。对于那些寻求增强室内无线信号质量和覆盖范围的工程师和系统设计师来说,这篇论文提供了有价值的技术参考。
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IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, VOL. 14, 2015 839
A Broadband Dipole Antenna for Multiservice Indoor
Distributed Antenna System (MS-IDAS)
Qi Wu, Member, IEEE, Xiaojing Ding, and Aixin Chen
Abstract—Multiservice indoor distributed antenna system (MS-
IDAS) plays an important role in wireless communications. This
letter investigates a broadband antenna for MS-IDAS, which is
composed of a loop-loaded dipole, a microstrip feeding line, and
a flat reflector. Through the loop-loaded structure, the low fre-
quency band is greatly extended. A prototype with dimensions of
mm mm mm is presented to cover the frequency band
of 880-2700 MHz. Indoor coverage experiments prove that high
quality signals are provided by the antenna within the designed
bandwidth, which is a decent candidate for MS-IDAS.
Index Terms—Broadband, indoor distributed antenna system
(IDAS), multiservice, planar dipole.
I. INTRODUCTION
W
ITH the development of wireless communications,
deployments of indoor distributed antenna system
(IDAS) are rapidly growing in shopping malls, business cen-
ters, and large stations. In the early stage, wireless coverage of
indoor areas was provided by outdoor stations. However, the
coverage is not satisfactory due to high signal losses caused
by the building walls [1], [2]. Therefore, IDAS was first pro-
posed for GSM and CDMA [3]–[5], and nowadays known as
multiservice IDAS (MS-IDAS) [6] [7]. In many scenarios, it
is desirable for MS-IDAS to be compatible with the latest 4G
protocol and also other services like WiFi and 3G protocol [8].
Compact antennas are an important enabler of MS-IDAS, as
they should fit the indoor environments. Two strategies exist for
MS-IDAS: using multiband antennas or broadband antennas. A
multiband monopole is proposed in [9], which works at 2.6, 3.5,
and 5.5 GHz. However, its measured gain is only 3.7, 3.1, and
4.8 dBi, respectively. A dual-band patch antenna is reported to
cover five bands including CDMA800, GSM900, GSM1800,
CDMA1900, and UMTS [10]. It has an average gain over 7 dBi,
but has also large dimensions. A low-profile multiband antenna
covers GSM900, DCS1800, UMTS, and WLAN (ISM band),
Manuscript received October 01, 2014; revised November 20, 2014; accepted
December 10, 2014. Date of publication December 31, 2014; date of current ver-
sion March 30, 2015. This work was supported by the Alexander von Humboldt
Foundation, Germany.
Q. Wu is with the School of Electronics and Information Engineering, Bei-
hang University, Beijing, China he is also with the Institut für Theoretische
Elektrotechnik, Technische Universität Hamburg-Harburg, Hamburg, Germany
(e-mail: qwu@buaa.edu.cn; qi.wu@tuhh.de).
X. Ding and A. Chen are with the School of Electronics and Information
Engineering, Beihang University, Beijing, China.
Color versions of one or more of the figures in this letter are available online
at http://ieeexplore.ieee.org.
Digital Object Identifier 10.1109/LAWP.2014.2381876
Fig. 1. Structural configuration of the proposed antenna. (a) 3-D view.
(b) Planar dipole. (c) Opened loop.
with dimensions of mm mm mm [11]. Still,
these antennas cannot cover 4G services such as LTE2.6. In this
letter, the broadband strategy is investigated as an alternative.
A compact antenna is presented to cover the mobile services
within 880-2700 MHz.
II. A
NTENNA DESIGN CONSIDERATIONS
A. Antenna Structure
The proposed antenna, shown in Fig. 1, is composed of
a loop-loaded dipole, a microstrip feeding line, and a flat
reflector. The loop-loaded dipole consists of a planar dipole
and an opened loop, which is printed on a dielectric substrate
with dimensions of
mm mm mm and a relative
permittivity of 2.65. The planar dipole is the main radiator, and
the opened loop is used as an inductive loading [12], [13]. Full
wave simulations are performed to evaluate its performance by
HFSS as shown in Fig. 2. With the opened loop, the impedance
bandwidth is increased by 400 MHz and the gain is also im-
proved. Performance of the closed loop is similar as the opened
loop, except for slightly higher VSWR and lower gain in the
low frequency band. Note that an infinite reflector is adapted
and a
“lump port” is used to feed the planar dipole in
HFSS. The feeding impedance for a planar monopole is mainly
determined by the bevel angle
, for example it
is about
when the bevel angle equals to [14]. The
1536-1225 © 2014 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.
See http://www.ieee.org/publications_standards/publications/rights/index.html for more information.
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