天線小型化技術(shù)

1、 微帶天線小型化技術(shù)微帶天線小型化技術(shù)學(xué)習(xí)報(bào)告學(xué)習(xí)報(bào)告 -GD.Bo.K報(bào)告時(shí)間 -2015.4.16Miniaturized Microstrip Patch Antenna1 張欽欣. 微帶天線的小型化技術(shù)研究. 西安電子科技 大學(xué). 2012.32 李凡. 左右手復(fù)合結(jié)構(gòu)傳輸線小型化天線研究. 北京 交通大學(xué). 2011.123 X.L. Sun, J. Zhang, S.W. Cheung and T.I. Yuk, A Small Patch AntennaUsing a Single CRLH TL Unit Cell. IEEE. 20124 Yunhong He, Xiaoli

2、 Zhao, Jiusheng Li. A Compact High Gain Microstrip Array Antenna. IEEE. 20115 Hang Wong,Kwok Kan So,.,Virtually Shorted Patch Antenna for Circular Polarization. IEEE. 20116 Wenbin Zeng, Guo Liu, Ming Li, and Liang Xu. Miniaturized I-shaped Slot Circularly Polarized RFID Antenna. IEEE. 2014參考文獻(xiàn)參考文獻(xiàn)7

3、Suzette M,.Multiband Miniaturized Patch Antennas for a Compact, Shielded Microwave Breast Imaging Array. IEEE. 20148 Jeen-Sheen Row and Yen-Yu Liou, Broadband Short-Circuited Triangular Patch Antenna . IEEE. 20069 Hana Trefna and Mikael Persson,Antenna Array Design for Brain Monitoring. IEEE. 200810

4、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.Miniaturized Microstrip Patch Antenna1 張欽欣. 微帶天線的小型化技術(shù)研究現(xiàn)在常用的天線小型化技術(shù)有以下幾種： 1）增加介質(zhì)基板的介電常數(shù)； 2）

5、短路加載技術(shù)； 3）曲流技術(shù)； 4）附加有源網(wǎng)絡(luò)； 5）采用特殊形狀的貼片 通常，曲流技術(shù)和短路加載技術(shù)同時(shí)使用，天線在減小尺寸的同時(shí)，還可以提高其他電參數(shù)的指標(biāo)。3 A Small Patch Antenna Using a Single CRLH TL2 Unit Cell The substrate with r of 3.5 and thickness of 1.5 mm. The size of the patch is reduced to 9 mm12.9 mm, which is 0.18 g0.26 g at the resonant frequency of 3.59 GH

6、z, 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 CellFig. 2 Photograph of fabricated antenna3 A Small Patch Antenna Using a Single CRLH TL Unit CellFig. 3 Simulated and measured S11Fig. 4 Measured peak gain3 A Small Patch

7、 Antenna Using a Single CRLH TL Unit CellMeasured peak gainMeasured efficiency4 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

8、 and the peak gain of the proposed antenna achieves 15.62dBi at 2.483GHz. the size of e f=180mm180mm.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 frequen

9、cy band and other relative microwave RF device.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

10、 the proposed antenna operating at 2.45GHz are shown in Fig.5.Fig. 4 The gain of the proposed antenna15.62dBi at 2.483GHz4 A Compact High Gain Microstrip Array AntennaFig. 5 The radiation patterns at frequency of 2.45GHz5 Virtually Shorted Patch Antenna for Circular Polarization This paper presents

11、a new circularly polarized patch antenna with loaded shorting elements to achieve symmetric broadside radiation and size reduction.5 Virtually Shorted Patch Antenna for Circular PolarizationFig. 3 Measured and simulated antenna gain for a CP patch antenna withparasitic shorting strips.5 Virtually Sh

12、orted Patch Antenna for Circular PolarizationFig. 4 Measured and simulated radiation pattern (AR) at frequency of 2.492 GHz for a CP patch antenna with parasitic shorting strips5 Virtually Shorted Patch Antenna for Circular Polarization 文獻(xiàn)6也提出了一種小型圓極化貼片天線，如上圖a所示。除此，這種天線還具有很好的方向性和軸比。其E-H面方向圖如上圖b所示。(a

13、) 天線結(jié)構(gòu)（b）E-H面7 Multiband Miniaturized Patch Antennas for a Compact, Shielded Microwave Breast Imaging Array This paper present a Miniaturization and multiband operation are achieved by loading the antenna with nonradiating slots at strategic locations along the patch.7 Multiband Miniaturized Patch A

14、ntennas for a Compact, Shielded Microwave Breast Imaging Array7 Multiband Miniaturized Patch Antennas for a Compact, Shielded Microwave Breast Imaging Array 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 ground-pl

15、ane backing on the array ensures unidirectional radiation and minimizes environmental interference.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

16、 of RS+CS+NRS patch antennas.9 Antenna Array Design for Brain Monitoring In this paper we investigate the possibility to improve monitoring of patients with transient cerebral(大腦的) ischemic（缺血性的） events using microwaves. The proposed antenna array will be part of the system that evaluates heamorrhag

17、ic（出血的） stroke. The main features of the elements of the proposed system are the small sizes, lightweight, and low cost. 為擴(kuò)展帶寬，本文采用了對貼片天線開縫的方式來實(shí)現(xiàn)。Common techniques to enhance the bandwidth includes cutting of slots of various shapes in the patch 8.Fig.1. Geometry of the proposed short-circuited tria

18、ngular patch antenna;89 Antenna Array Design for Brain Monitoring The geometry of an antenna element is shown in Fig. 2.a. The shorting wall is connected to the edge of the triangular patch and the ground plane,同樣的技術(shù)在文獻(xiàn)10中也被才采用，加短路是為了減小尺寸和增加帶寬。Fig.2. a)Geometry of the proposed antenna9 Antenna Array

19、 Design for Brain Monitoring Fig.2. b) Simulated return loss for different permittivity of matching liquid.9 Antenna Array Design for Brain Monitoring The sensitivity(敏感性) of the design to various distances from muscle phantom is showed in Fig. 3. Fig.3. Simulated return loss for various distances b

20、etween the phantom and the antenna.9 Antenna Array Design for Brain Monitoring In this study, a simplied arrangement of eight antennas is used, placed around the the dialectric head model, as shown in Figures 4. The distancebetween antennas is less than which means that mode is excitedFig.4. The ant

21、enna array.2/20TM9 Antenna Array Design for Brain Monitoring Fig.5. Simulated return loss for different coupling between antennas.9 Antenna Array Design for Brain Monitoring Fig.6. show a simulated return loss of antenna nr. 4 (S44) for different scenarios.9 Antenna Array Design for Brain Monitoring

22、 This picture display the return loss differ at both resonant frequencies, however at the lower frequency the difference of 3 dB for the case with a heamorage of radius 3 cm is quite signicant. In addition, at the second resonant frequency, the difference between the two largest heamorage is more clear.11 A Smart Antenna Array for Brain Cancer Detection A smart antenna array is designed and fabricated for brain cancer d