天线小型化技术

15.62dBi at 2.483GHz
Βιβλιοθήκη Baidu
Fig. 4 The gain of the proposed antenna
[4] A Compact High Gain Microstrip Array Antenna
Fig. 5 The radiation patterns at frequency of 2.45GHz
[9] Antenna Array Design for Brain Monitoring In this paper we investigate the possibility to improve monitoring of patients with transient cerebral(大脑的) ischemic（缺血性的） events using microwaves. The proposed antenna array will be part of the system that evaluates heamorrhagic（出血的） stroke. The main features of the elements of the proposed system are the small sizes, lightweight, and low cost. 为扩展带宽，本文采用了对贴片天 线开缝的方式来实现。Common techniques to enhance the bandwidth includes cutting of slots of various shapes in the patch [8].
This paper present a Miniaturization and multiband operation are achieved by loading the antenna with nonradiating slots at strategic locations along the patch.
[5] Virtually Shorted Patch Antenna for Circular Polarization
Fig. 4 Measured and simulated radiation pattern (AR) at frequency of 2.492 GHz for a CP patch antenna with parasitic shorting strips
[5] Virtually Shorted Patch Antenna for Circular Polarization
(a) 天线结构
（b）E-H面
文献[6]也提出了一种小型圆极化贴片天线，如上图a所示。除此， 这种天线还具有很好的方向性和轴比。其E-H面方向图如上图b所示。
[7] Multiband Miniaturized Patch Antennas for a Compact, Shielded Microwave Breast Imaging Array
Miniaturized Microstrip Patch Antenna [7] Suzette M,..."Multiband Miniaturized Patch Antennas for a Compact, Shielded Microwave Breast Imaging Array". IEEE. 2014 [8] Jeen-Sheen Row and Yen-Yu Liou, "Broadband Short-Circuited Triangular Patch Antenna ". IEEE. 2006 [9] Hana Trefn´a and Mikael Persson,"Antenna Array Design for Brain Monitoring". IEEE. 2008 [10]Y. Li, R. Chair, M.K. Luk, K.F. Lee, ” Broadband triangular patch antenna with folded shorting wall” , IEEE . 2004. [11] Haoyu Zhang, Ahmed O. El-Rayis,..."A Smart Antenna Array for Brain Cancer Detection". IEEE. 2011.
[4] A Compact High Gain Microstrip Array Antenna
The measured return loss is less than -15dB from 2.390 to 2.523GHz, which indicates that the proposed antenna is applied for 2.4GHz WLAN working frequency band and other relative microwave RF device.
The array is populated with 32 miniaturized, slot-loaded patch antennas and has a total linear dimension(L+W+W)of less than 50 cm.The groundplane backing on the array ensures unidirectional radiation and minimizes environmental interference.
[4] A Compact High Gain Microstrip Array Antenna
This antenna is realized in a printed FR4 board with a permittivity of 3.99. The working frequency bandwidth is from 2.390 to 2.522GHz where the return loss is less than -15dB and the peak gain of the proposed antenna achieves 15.62dBi at 2.483GHz. the size of e × f=180mm×180mm.
[4] A Compact High Gain Microstrip Array Antenna The experiments prove that the unique design does not change the antenna gain and directionality, From Fig.4, it can be found that a large gain are obtained. The radiation patterns at E-plane and H-plane of the proposed antenna operating at 2.45GHz are shown in Fig.5.
[5] Virtually Shorted Patch Antenna for Circular Polarization
Fig. 3 Measured and simulated antenna gain for a CP patch antenna withparasitic shorting strips.
[7] Multiband Miniaturized Patch Antennas for a Compact, Shielded Microwave Breast Imaging Array
(a), (b) Actual profile (e), (f) Images reconstructed from simulated data acquired using an enclosed array of RS+CS+NRS patch antennas.
[1] 张钦欣. 微带天线的小型化技术研究
现在常用的天线小型化技术有以下几种： 1）增加介质基板的介电常数； 2）短路加载技术； 3）曲流技术； 4）附加有源网络； 5）采用特殊形状的贴片 通常，曲流技术和短路加载技术同时使用，天线在 减小尺寸的同时，还可以提高其他电参数的指标。
[3] A Small Patch Antenna Using a Single CRLH TL[2] Unit Cell The substrate with εr of 3.5 and thickness of 1.5 mm. The size of the patch is reduced to 9 mm×12.9 mm, which is 0.18 λg×0.26 λg at the resonant frequency of 3.59 GHz, The measured results exhibit a bandwidth of 24 MHz AND gain of -4.7 dBi .
[3] A Small Patch Antenna Using a Single CRLH TL Unit Cell
Fig. 2 Photograph of fabricated antenna
[3] A Small Patch Antenna Using a Single CRLH TL Unit Cell
Fig. 3 Simulated and measured S11
Fig. 4 Measured peak gain
[3] A Small Patch Antenna Using a Single CRLH TL Unit Cell
Measured peak gain
Measured efficiency
[7] Multiband Miniaturized Patch Antennas for a Compact, Shielded Microwave Breast Imaging Array
[7] Multiband Miniaturized Patch Antennas for a Compact, Shielded Microwave Breast Imaging Array
微带天线小型化技术 学习报告
------GD.Bo.K
报告时间 ---2015.4.16
Miniaturized Microstrip Patch Antenna 参考文献 [1] 张钦欣. 微带天线的小型化技术研究. 西安电子科技 大学. 2012.3 [2] 李凡. 左右手复合结构传输线小型化天线研究. 北京 交通大学. 2011.12 [3] X.L. Sun, J. Zhang, S.W. Cheung and T.I. Yuk, "A Small Patch AntennaUsing a Single CRLH TL Unit Cell". IEEE. 2012 [4] Yunhong He, Xiaoli Zhao, Jiusheng Li. "A Compact High Gain Microstrip Array Antenna". IEEE. 2011 [5] Hang Wong,Kwok Kan So,...,"Virtually Shorted Patch Antenna for Circular Polarization". IEEE. 2011 [6] Wenbin Zeng, Guo Liu, Ming Li, and Liang Xu. "Miniaturized I-shaped Slot Circularly Polarized RFID Antenna". IEEE. 2014
[5] Virtually Shorted Patch Antenna for Circular Polarization This paper presents a new circularly polarized patch antenna with loaded shorting elements to achieve symmetric broadside radiation and size reduction.