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Journal articles on the topic 'Wide band frequency'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Ying Yu, Ying Yu, Cheng Lei Cheng Lei, Minghua Chen Minghua Chen, Hongwei Chen Hongwei Chen, Sigang Yang Sigang Yang, and Shizhong Xie Shizhong Xie. "Generation and noise analysis of a wide-band optical -frequency comb based on recirculating frequency shifter." Chinese Optics Letters 12, no. 10 (2014): 100601–4. http://dx.doi.org/10.3788/col201412.100601.

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2

Rahmati, Bahman, and Hamid Reza Hassani. "FREQUENCY NOTCHED WIDE BAND PLANAR MONOPOLE ANTENNAS." Progress In Electromagnetics Research C 9 (2009): 131–43. http://dx.doi.org/10.2528/pierc09061703.

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3

Kido, Takashi, and Motoyuki Sato. "Wide band stepped-frequency ground penetrating radar." BUTSURI-TANSA(Geophysical Exploration) 69, no. 4 (2016): 269–79. http://dx.doi.org/10.3124/segj.69.269.

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4

Kawamura, Seiji, Alex Abramovici, and Michael E. Zucker. "Improved multistage wide band laser frequency stabilization." Review of Scientific Instruments 68, no. 1 (1997): 223–29. http://dx.doi.org/10.1063/1.1147813.

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5

Yu, Weiliang, Guo Qing Luo, Yufeng Yu, Xiao Hong Zhang, and Kuikui Fan. "Miniaturised band‐absorptive frequency selective rasorbers with wide absorption band." IET Microwaves, Antennas & Propagation 13, no. 11 (2019): 1777–81. http://dx.doi.org/10.1049/iet-map.2018.6170.

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6

Abdulhussein, Nabil, and Abdulkareem Abdullah. "Design of a Wide Dual-Band Coplanar Probe Feed Antenna for WLANs Applications." 3D SCEEER Conference sceeer, no. 3d (2020): 13–16. http://dx.doi.org/10.37917/ijeee.sceeer.3rd.2.

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This paper presents a new design to obtain wide dual-band operation from a coplanar probe feed antenna loaded with two shorted walls. The lower band of proposed antenna has a 10 dB bandwidth of 611 MHz (24.18%) around the center frequency 2527MHz, and the upper band has a bandwidth of 1255 MHz (27.88%) around the center frequency 4501MHz. The obtained bandwidths cover WLANs operations on all bands. The bandwidth of the first operating frequency covers ISM band (2400-2483.5) MHz, which is required by IEEE 802.11b, g and Bluetooth standards, and the bandwidth of the second operating frequency covers U-NII1 (5150-5350) MHz band, which is required by IEEE 802.11a and HiperLAN2 standards, and also covers U-NII2 (5470-5725) MHz and U-NII3/ISM (5725-5825) MHz bands, which are required by IEEE 802.11a standard. A three dimensional finite-difference time-domain (3-D FDTD) method is employed to analyze the proposed structure and find its performance. The simulated results are compared with the experimental results.

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Hussain, Rifaqat, and Mohammad S. Sharawi. "Wide-band frequency agile MIMO antenna system with wide tunability range." Microwave and Optical Technology Letters 58, no. 9 (2016): 2276–80. http://dx.doi.org/10.1002/mop.30019.

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8

Gao, P., C. Zhang, J. Ai, G. Li, and Y. Kang. "Metamaterial with negative refraction over wide frequency band." Materials Research Innovations 18, no. 5 (2013): 346–50. http://dx.doi.org/10.1179/1433075x13y.0000000151.

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9

Dieulangard, Anthony, Jean-Claude Kastelik, Samuel Dupont, and Joseph Gazalet. "Acousto-optic wide band optical low-frequency shifter." Applied Optics 52, no. 33 (2013): 8134. http://dx.doi.org/10.1364/ao.52.008134.

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10

Wang, C. j., and J. j. Lee. "A Pattern-Frequency-Dependent Wide-Band Slot Antenna." IEEE Antennas and Wireless Propagation Letters 5, no. 1 (2006): 65–68. http://dx.doi.org/10.1109/lawp.2006.870369.

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11

Desgrez, S., M. Gayral, O. Llopis, J. C. Cayrou, J. L. Cazaux, and J. F. Sautereau. "Wide-bandwidth Ku-band monolithic analog frequency divider." IEEE Microwave and Guided Wave Letters 8, no. 2 (1998): 84–86. http://dx.doi.org/10.1109/75.658649.

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12

Geng, Cong, Xuelin Yang, and Weisheng Hu. "Wide-Band Optical Frequency Hopping Using Digital Chaos." Journal of Signal Processing Systems 92, no. 1 (2019): 1–8. http://dx.doi.org/10.1007/s11265-019-01446-9.

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13

Abdulkawi, Wazie M., Waqar Ahmad Malik, Sajjad Ur Rehman, Abdul Aziz, Abdel Fattah A. Sheta, and Majeed A. Alkanhal. "Design of a Compact Dual-Band MIMO Antenna System with High-Diversity Gain Performance in Both Frequency Bands." Micromachines 12, no. 4 (2021): 383. http://dx.doi.org/10.3390/mi12040383.

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A compact four-element dual-band multiple-input and multiple-output (MIMO) antenna system is proposed to achieve high isolation and low channel capacity loss. The MIMO antenna was designed and optimized to cover the dual-frequency bands; the first frequency band is a wide band, and it covers the frequency range of 1550–2650 MHz, while the other frequency band covers the 3350–3650 MHz range. The measured wide-band impedance bandwidths of 1.1 GHz and 300 MHz were achieved in the lower and upper frequency bands, respectively. The proposed structure consists of four novel antenna elements, along with a plus-sign-shaped ground structure on an FR4 substrate. The overall electrical size of the whole dual-band MIMO antenna system is 0.3λ(W) × 0.3λ(L) × 0.008λ(H) for the lower frequency band. It achieved greater than 10 and 19 dB isolation in the lower and upper frequency bands, respectively. The antenna system accomplished an envelope correlation coefficient of |ρ|≤0.08 in the lower frequency band, while it achieved |ρ|≤0.02 in the higher frequency band. The computed channel capacity loss remained less than almost 0.4 bits/s/Hz in both frequency bands. Therefore, it achieved good performance in both frequency bands, with the additional advantage of a compact size. The proposed MIMO antenna is suitable for compact handheld devices and smartphones used for GSM (Global System for Mobiles), UMTS (Universal Mobile Telecommunications Service), WCDMA (Wideband Code Division Multiple Access), LTE (Long Term Evolution), 5G sub-6 GHz, PCS (Personal Communications Service), and WLAN (wireless local area network) applications.

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14

V.Prashanth, K., N. Sai Venkatesh, B. Umamaheswari, et al. "Design of UWB Antenna With Multi slot for Wireless Communication." International Journal of Engineering & Technology 7, no. 2.7 (2018): 507. http://dx.doi.org/10.14419/ijet.v7i2.7.10872.

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A Compact dual slot ultra-wide band (UWB) Antenna for WLAN and X-Band applications is proposed. The projected antenna is designed for the planar ultra-wide band (UWB) antenna and ultra-wide band (UWB) with two band dismissals. The proposed antenna overall size is 30x40x1.6. The antenna comprises of Rectangular patch imprinted on the Flame Resistant (FR4) substrate with 50Ω input impedance. FR-4 is a composite material made out of fiberglass fabric woven with an epoxy pitch cover that is fire safe (self-dousing). "FR" implies fire resistant, and means that the material meets the standard. This patch consists of dual slot one for WLAN and one for X-band Satellite Communication System. The antenna intended with return loss (RL) >= 10db and frequency ranges between 3.1 to 10.6 GHz with VSWR<2. The antenna works for the applications of wireless local area network (WLAN) system (5.15 – 5.825 GHz), X-band downlink (7.25 - 7.75). The ultra-wide band frequency range for these wireless systems causes interference. To reduce the interference, band notching is done. The WLAN and X-Band satellite communication system bands are forbidden by inserting slots in the patch. The proposed antenna is having high gain at the pass bands while a sharp drop at the forbidden bands.

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15

Rius, E., G. Prigent, H. Happy, G. Dambrine, S. Boret, and A. Cappy. "Wide- and narrow-band bandpass coplanar filters in the W -frequency band." IEEE Transactions on Microwave Theory and Techniques 51, no. 3 (2003): 784–91. http://dx.doi.org/10.1109/tmtt.2003.808586.

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16

Xu, Yonggang, Qiang Xu, Ting Liu, Dianliang Zheng, and Li Zhou. "A Wide Band Absorbing Material Design Using Band-Pass Frequency Selective Surface." IOP Conference Series: Materials Science and Engineering 322 (March 2018): 022029. http://dx.doi.org/10.1088/1757-899x/322/2/022029.

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17

Bashiri, M., Ch Ghobadi, J. Nourinia, and M. Majidzadeh. "An explicit single-layer frequency selective surface design with wide stop band frequency response." International Journal of Microwave and Wireless Technologies 10, no. 7 (2018): 819–25. http://dx.doi.org/10.1017/s1759078718000260.

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AbstractThis manuscript deals with the development of a novel configuration of a wide-band single-layer frequency selective surface (FSS) for wide-band rejection applications. The established unit cell is composed of a simple circular ring on the top side of the substrate and a combined conductive element on the backside. Such an inclusion of conductive elements and accurate tuning of their dimensions ends in the rejection of a wide frequency band extended from 6.3 to 16.3 GHz. Moreover, the proposed structure exhibits a stable response against different angles of incidence for both TE and TM polarizations. Detailed simulation and measurement studies are carried out to investigate the performance of the proposed FSS. The obtained results are discussed in depth.

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18

Kumar, N. Anvesh, and A. S. Gandhi. "A Compact Novel Three-Port Integrated Wide and Narrow Band Antennas System for Cognitive Radio Applications." International Journal of Antennas and Propagation 2016 (2016): 1–14. http://dx.doi.org/10.1155/2016/2829357.

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The design of a three-port radiating structure, integrating wide and narrow band antennas for cognitive radio applications, is presented. It consists of a UWB antenna for spectrum sensing and two narrow band antennas for wireless communication integrated on the same substrate. The UWB antenna covers the complete UWB spectrum (3.1 GHz to 10.6 GHz) approved by FCC. In the two narrow band antennas, each antenna presents dual bands. In particular, the first narrowband antenna resonates at 6.5 GHz, covering the frequency band between 6.36 GHz and 6.63 GHz, and at 9 GHz, covering the frequency band between 8.78 GHz and 9.23 GHz, presenting minimum return loss values of 28.3 dB at 6.5 GHz and 20.5 dB at 9 GHz, respectively. Similarly, the second one resonates at 7.5 GHz, covering the frequency band between 7.33 GHz and 7.7 GHz, and at 9.5 GHz, covering the frequency band between 9.23 GHz and 9.82 GHz, presenting minimum return loss values of 19.6 dB at 7.5 GHz and 28.8 dB at 9.5 GHz, respectively. Isolation among the three antennas is less than −20 dB over the UWB frequency spectrum. These antennas are realized on a FR4 substrate of dimensions 30 mm × 30 mm × 1.6 mm. Experimental results show a good agreement between the simulated and measured results.

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19

Song, Yipeng, and Frede Blaabjerg. "Wide Frequency Band Active Damping Strategy for DFIG System High Frequency Resonance." IEEE Transactions on Energy Conversion 31, no. 4 (2016): 1665–75. http://dx.doi.org/10.1109/tec.2016.2591779.

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20

Sood, D., and C. C. Tripathi. "Polarization Insensitive Compact Wide Stop-band Frequency Selective Surface." Journal of Microwaves, Optoelectronics and Electromagnetic Applications 17, no. 1 (2018): 53–64. http://dx.doi.org/10.1590/2179-10742018v17i11128.

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21

Feng, Yuan, Xiang Fan, Wei Chen, and Lei Han. "Design of a wide band frequency-hopping signal generator." JOURNAL OF ELECTRONIC MEASUREMENT AND INSTRUMENT 24, no. 10 (2010): 958–63. http://dx.doi.org/10.3724/sp.j.1187.2010.00958.

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22

Al-Rawi, Aoday H., W. M. A. Ibrahim, and Eraj Humayun Mirza. "DC feedback for wide band frequency fixed current source." Journal of Electrical Bioimpedance 4, no. 1 (2019): 33–37. http://dx.doi.org/10.5617/jeb.294.

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Abstract Alternating current sources are mainly used in bioelectrical impedance devices. Nowadays 50 – 100 kHz bioelectrical impedance devices are commonly used for body composition analysis. High frequency bioelectrical impedance analysis devices are mostly used in bioimpedance tomography and blood analysis. High speed op-amps and voltage comparators are used in this circuit. Direct current feedback is used to prevent delay. An N-Channel J-FET transistor was used to establish the voltage controlled gain amplifier (VCG). A sine wave signal has been applied as input voltage. The value of this signal should be constant in 170 mV rms to keep the output current in about 1 mA rms. Four frequencies; 100 kHz, 1 MHz, 2 MHz and 3.2 MHz were applied to the circuit and the current was measured for different load resistances. The results showed that the current was stable for changes in the resistor load, bouncing around an average point as a result of bouncing DC feedback.

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23

Goldobin, E. B., V. K. Kaplunenko, M. I. Khabipov, and L. V. Filipenko. "Wide frequency band sampling system to test RSFQ logic." Cryogenics 32 (January 1992): 549–52. http://dx.doi.org/10.1016/0011-2275(92)90227-2.

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24

Shenoda, Fathy B., and Mohammed Abd‐Elbasseer. "Effective wide‐band, low‐frequency multiple resonator sound absorber." Journal of the Acoustical Society of America 107, no. 5 (2000): 2872. http://dx.doi.org/10.1121/1.428667.

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25

Winnall, S. T., A. C. Lindsay, and G. A. Knight. "A wide-band microwave photonic phase and frequency shifter." IEEE Transactions on Microwave Theory and Techniques 45, no. 6 (1997): 1003–6. http://dx.doi.org/10.1109/22.588620.

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26

Abutarboush, Hattan F., and Atif Shamim. "Wide frequency independently controlled dual‐band inkjet‐printed antenna." IET Microwaves, Antennas & Propagation 8, no. 1 (2014): 52–56. http://dx.doi.org/10.1049/iet-map.2013.0229.

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27

Guo, Tiantian, Min Guo, Xueqing Jia, Qiang Chen, and Yunqi Fu. "An Absorptive Frequency Selective Reflector With Wide Reflection Band." IEEE Access 8 (2020): 124217–22. http://dx.doi.org/10.1109/access.2020.2971010.

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28

Han, Ye, and Longjie Xu. "Dual‐polarized frequency‐selective absorber with wide transmission band." Microwave and Optical Technology Letters 62, no. 3 (2019): 1270–74. http://dx.doi.org/10.1002/mop.32128.

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29

Jang, Sheng-Lyang, Zhi-Hong Wu, Ching-Wen Hsue, and Heng-Fa Teng. "Wide-Locking Range Dual-Band Injection-Locked Frequency Divider." Microwave and Optical Technology Letters 55, no. 10 (2013): 2333–37. http://dx.doi.org/10.1002/mop.27828.

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30

Guo, Qingxin, Jianxun Su, Zengrui Li, Lamar Y. Yang, and Jiming Song. "Absorptive/Transmissive Frequency Selective Surface With Wide Absorption Band." IEEE Access 7 (2019): 92314–21. http://dx.doi.org/10.1109/access.2019.2927658.

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31

Kim, Jae Hwan. "Smart panel for decreasing noise in wide band frequency." Journal of the Acoustical Society of America 120, no. 6 (2006): 3448. http://dx.doi.org/10.1121/1.2409432.

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32

Ranjbar Naeini, Mohammadreza, Mohammad Fakharzadeh, and Forouhar Farzaneh. "Ka-band Frequency Scanning Antenna with Wide-Angle Span." Journal of Infrared, Millimeter, and Terahertz Waves 40, no. 2 (2019): 231–46. http://dx.doi.org/10.1007/s10762-018-0565-4.

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33

Pavlov, I. D., Ya V. Karaev, and M. A. Kot. "Ultra Wide Band Dielectric Rod Antenna." Journal of the Russian Universities. Radioelectronics 23, no. 2 (2020): 38–45. http://dx.doi.org/10.32603/1993-8985-2020-23-2-38-45.

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Introduction. Often, the space allocated for placement of an antenna has an inconvenient shape for this. The inconvenience is that its overall dimensions, namely the length and height, relate to each other approximately as 5:1. The task of placing the antenna in the space, in the absence of ready-made solutions, involves the development of an antenna with a similar ratio (5:1) of overall dimensions and with the possibility of convenient mounting on a flat conductive surface. Also, in the 9:1 frequency band, the antenna should have the following radio technical characteristics: voltage standing wave coefficient (VSWR) of not more than 3, gain of at least 1 dBi, radiation patterns should be axisymmetric with side lobe level not exceeding 25 %.Aim. Development and study of the characteristics of an ultra-wideband dielectric rod antenna.Materials and methods. Two structurally different versions of an ultra-wideband dielectric rod antenna were proposed. The main radio technical characteristics of both options were obtained through electrodynamic modeling in Ansoft HFSS.Results. As a result of the simulation, the following radio characteristics were obtained: – for the first option, the VSWR does not exceed 3.25 in the required frequency range, the gain varies from 6 to 12 dBi, the axisymmetric radiation patterns with the level of the side lobes not exceeding 30 %; – for the second option, the VSWR does not exceed 2.75 in the required frequency range, the gain varies from 5 to 11 dBi, the axisymmetric radiation patterns with the level of the side lobes not exceeding 20 %; In addition, the structural differences of the second option make it convenient to fix it on a flat conductive surface.Conclusion. Comparison of the obtained results with the requirements for the antenna under consideration shows that, unlike the first, the second option has an acceptable level of matching (VSWR 2.75) and of side radiation of radiation patterns (20 %). Based on this, it can be concluded that only the second option is suitable for the intended application.

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34

Kang, Chun-Ying, Shu Lin, Hua Zong, Zhi-Hua Zhao, and Xue-Ying Zhang. "A Wide-Band Circularly Polarized Wide-Gap Antenna Loaded with a Y-Shaped Metal Strip for L-Band Application." International Journal of Antennas and Propagation 2015 (2015): 1–12. http://dx.doi.org/10.1155/2015/194682.

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A wide-band circularly polarized wide-gap antenna loaded with a Y-shaped metal strip applied to L-band is proposed in this paper. The Y-shaped metal strip coupling motivates the wide gap to achieve wide-band circularly polarized radiation. Both the simulated results by CST Microwave Studio and the measured results indicate that the antenna impedance bandwidth (reflection coefficient less than −10 dB) and axial ratio bandwidth (AR < 3 dB) are 35.9% (1.1–1.71 GHz). The antenna produces a dual circularly polarized radiation with gain of 0.8–3.2 dBic. The equivalent current array model of the antenna is also presented, which well explains the radiation characteristics of the antenna. The introduction of the metal reflecting plate makes the antenna a directional one, whose gain is above 4 dBic within the band. This design enables the satellite communication for most frequency bands with high gain, which has a vast potential for future development.

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35

Nguyen, Cam. "Development of an extremely wide-band planar frequency doubler from Q-band to W-band." International Journal of Infrared and Millimeter Waves 8, no. 3 (1987): 199–205. http://dx.doi.org/10.1007/bf01014554.

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36

Khan, Muhammad Irshad, Muhammad Irfan Khattak, Gunawan Witjaksono, et al. "Experimental Investigation of a Planar Antenna with Band Rejection Features for Ultra-Wide Band (UWB) Wireless Networks." International Journal of Antennas and Propagation 2019 (June 2, 2019): 1–11. http://dx.doi.org/10.1155/2019/2164716.

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The Federal Communication Commission (FCC) has authorized the use of unlicensed ultra-wide band (UWB) spectrum in the frequency range from 3.1 to 10.6 GHz for a variety of short-range applications, including wireless monitors and printers, camcorders, radar imaging, and personal area networks (PANS). However, the interference between coexisting narrowband channels and UWB signals that share the same spectrum should be avoided by designing UWB antennas with band notch characteristics. This work presents a printed monopole antenna (PMA) with slots of different shapes etched in the radiating element to obtain band rejection in the three coexisting communication bands, i.e., Worldwide Interoperability for Microwave Access (WiMAX), Wireless Local Area Network (WLAN), and International Telecommunication Union (ITU). A rectangular slot is etched to reject the WiMAX band (3.01-3.68 GHz), an upturned C slot stops the WLAN band (5.18-5.73 GHz) while an inverted-U slot halts the ITU frequency band (7.7-8.5 GHz). The proposed antenna occupies a volume of 32 x 30 x 1.6 mm3 and it radiates efficiently (>90%) with a satisfactory gain (>1.95 dBi) in the unnotched UWB frequency range. The simulations are performed in High Frequency System Simulator (HFSS), while the measurements are conducted in antenna measurement facility and found in close agreement with the former.

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37

Nelson, David A., and Todd W. Fortune. "High-Level Psychophysical Tuning Curves." Journal of Speech, Language, and Hearing Research 34, no. 2 (1991): 360–73. http://dx.doi.org/10.1044/jshr.3402.360.

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Simultaneous-masked psychophysical tuning curves were obtained from normal-hearing listeners using low-level (20–25 dB SPL) probe tones in quiet and high-level (60 dB SPL) probe tones, both in quiet and in the presence of a broad-band background noise. The background noise was introduced to eliminate combination tones or combination bands and other off-frequency listening cues that exist at high levels. Tuning curves were obtained using pure-tone maskers and 100-Hz-wide narrow-band noise maskers for probe tones at 1000 and 4000 Hz. High-level tuning curves for pure-tone maskers demonstrated large discontinuities or “notches” on the low-frequency sides of the tuning curves. Broad-band background noise eliminated those notches, indicating that the notches were due to the detection of off-frequency listening cues at combination-tone frequencies. High-level tuning curves for 100-Hz-wide narrow-band maskers also demonstrated notches on the low-frequency sides. Those notches were eliminated with broad-band background noise, which indicates that combination bands strongly influenced the shapes of high-level tuning curves obtained with narrow-band maskers. The influence of combination bands was dependent upon test frequency. At 1000 Hz, combination bands had very little influence on the shapes of high-level tuning curves. At 4000 Hz, where the masker bandwidth was substantially less than the critical bandwidth, combination bands strongly affected the low-frequency sides of the tuning curves. In 2 subjects tested at a probe frequency of 2000 Hz with 100-Hz-wide masking bands, combination bands also influenced the lowfrequency sides of high-level tuning curves. The presence of combination-tone or combination-band cues essentially steepened the low-frequency slopes of tuning curves, resulting in sharper estimates of tuning. Comparisons of tuning curves obtained with pure-tone maskers and narrow-band maskers, in the same listeners, revealed that pure-tone maskers were more effective than narrow-band maskers when the masker frequencies were in the tail region of the tuning curve. The results of these experiments support the notion that tuning in the normal auditory system broadens notably with stimulus level, once off-frequency listening cues such as combination tones or combination bands are eliminated. The low-level simultaneously masked tuning curve demonstrates a sharp bandpass tuning characteristic, whereas the high-level simultaneously masked tuning curve in background noise demonstrates a broad low-pass tuning characteristic. It is argued that comparisons of tuning in impaired ears with tuning in normal ears should be made using estimates of tuning in normal ears that are not influenced by combination-tone or combination-band detection cues.

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38

Gao, Ju, Yiming Zhang, Yang Sun, and Qiang Wu. "Ultra-Wide Band and Multifunctional Polarization Converter Based on Dielectric Metamaterial." Materials 12, no. 23 (2019): 3857. http://dx.doi.org/10.3390/ma12233857.

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Polarization has always been an important issue in modern communication systems, especially in sensitive measurements. Conventional polarization converters show limited applications due to their large size and narrow bandwidth. In this paper, we demonstrate an ultra-wide band, multifunctional, and highly efficient metamaterial-based polarization converter that is capable of converting a linearly polarized wave into its cross-polarized wave and circularly polarized wave over different frequency bands. The design principle is based on the field transformation theory and the anisotropic plate is made with high/low permittivity strip metamaterials. The simulation results show that the metamaterial-based polarization converter is able to achieve linear-to-linear conversion over 11.5–12.6 GHz, and linear-to-circular conversion over two frequency bands, 3.0–11.5 GHz and 12.6–17.0 GHz, with an average polarization conversion efficiency over 90%. The polarization converter proposed in this paper provides an important stepping stone for future communication systems’ polarization control and can also be extended to higher frequency bands.

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39

Li, Yingsong, Wenxing Li, and Qiubo Ye. "A CPW-Fed Circular Wide-Slot UWB Antenna with Wide Tunable and Flexible Reconfigurable Dual Notch Bands." Scientific World Journal 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/402914.

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A coplanar waveguide (CPW)-fed circular slot antenna with wide tunable dual band-notched function and frequency reconfigurable characteristic is designed, and its performance is verified experimentally for ultra-wideband (UWB) communication applications. The dual band-notched function is achieved by using a T-shaped stepped impedance resonator (T-SIR) inserted inside the circular ring radiation patch and by etching a parallel stub loaded resonator (PSLR) in the CPW transmission line, while the wide tunable bands can be implemented by adjusting the dimensions of the T-SIR and the PSLR. The notch band reconfigurable characteristic is realized by integrating three switches into the T-SIR and the PSLR. The numerical and experimental results show that the proposed antenna has a wide bandwidth ranging from 2.7 GHz to 12 GHz with voltage standing wave ratio (VSWR) less than 2, except for the two notch bands operating at 3.8–5.9 GHz and 7.7–9.2 GHz, respectively. In addition, the proposed antenna has been optimized to a compact size and can provide omnidirectional radiation patterns, which are suitable for UWB communication applications.

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40

Raghunathan, Agaram, B. Girish, R. Somashekar, et al. "Wide Band Antenna with Ultra-smooth Spectral Characteristics." Applied Computational Electromagnetics Society 35, no. 11 (2021): 1292–93. http://dx.doi.org/10.47037/2020.aces.j.351115.

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Understanding the evolution of Universe is, in the forefront of, the modern day observational cosmology. It requires precise and accurate measurement of cosmological signal, orders of magnitude weaker than the bright sky background. Detection of such a signal having distinct spectral signature, needs an antenna with frequency independent characteristics over more than an octave bandwidth. A spherical monopole antenna has been designed to operate in the frequency range 50-200 MHz with a spectral smoothness of about few parts in 104. The structure has been modeled and optimized using WIPL-D, to minimize spectral features arising out of abrupt reflections of surface currents and frequency dependent radiation patterns. A prototype has been built to validate the design. This paper presents the methodology adopted in the overall antenna design, experiences in its prototyping and simulation and the measurement results.

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Et. al., Vutukuri Sarvani Duti Rekha,. "A Compact Dual Notch Frequency Reconfigurable Antenna for WIMAX,DSRC, RADAR and Ku band Communication Applications." INFORMATION TECHNOLOGY IN INDUSTRY 9, no. 2 (2021): 740–46. http://dx.doi.org/10.17762/itii.v9i2.407.

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A frequency reconfigurable ultra-wide band antenna with dual notch bands is proposed in this paper. PIN diodes are located on ultra-wide band monopole antenna and are investigated for frequency reconfigurable characteristic of the proposed antenna. Multi-bands and narrow bands have been achieved by different combinations. Proposed antenna is fabricated on FR-4 substrate of dimensions 37 x 40 x 0.8mm3. For the successful combinations, antenna performance parameters like S11 characteristics, surface current distribution, peak gain, radiation efficiency and 2D radiation patterns are analyzed and illustrated in the paper. Peak gain of 4.83dB is obtained in operating band for D1, D2= 0, 1 combination. Radiation efficiency is not less than 70% in the entire operating bands. Results are analyzed experimentally for validating proposed antenna. Simulation based results and measured results are in good agreement.

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AL-Saif, Haitham, Muhammad Usman, Muhammad Tajammal Chughtai, and Jamal Nasir. "Compact Ultra-Wide Band MIMO Antenna System for Lower 5G Bands." Wireless Communications and Mobile Computing 2018 (June 4, 2018): 1–6. http://dx.doi.org/10.1155/2018/2396873.

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This paper presents a novel compact 2 × 2 planar MIMO antenna system with ultra-wide band capability. Antenna system is specifically designed to target lower 5th generation operating bands ranging from 2 GHz to 12 GHz. This band also covers the IEEE 802.11 a/b/g/n/ac. The antenna array geometry has been simulated using CST MWS. The design is extremely miniaturized with total structure size of 13×25×0.254 mm3. The simulated and measured results have been presented. Measured and simulated return loss values for designed antenna are less than −10 dB over the operating band and lowest values of −35 dB and −32.5 dB can been seen at 5.2 GHz and 9.2 GHz, respectively, whereas at the center frequency the return loss is −25.2 dB. The mutual coupling between both elements is less than −20 dB over the transmission bandwidth. Simulated and measured radiation patterns in E and H planes at center frequency show nearly isotropic far fields. The maximum gain is measured as 4.8 dB. Promising results of Envelope Correlation Coefficient and gain diversity of the design have been achieved. Simulated and measured results are found in good agreement. The fractional bandwidth of antenna is measured as 143.2% which satisfies its ultra-wide band response.

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Rozdobudko, V. V. "Acoustooptic Wide Band Sensors for Frequency and Phase Modulated Radiosignals." Telecommunications and Radio Engineering 56, no. 3 (2001): 20. http://dx.doi.org/10.1615/telecomradeng.v56.i3.60.

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Zaidi, Aijaz M., Mirza Tariq Beg, Binod K. Kanaujia, Kunal Srivastava, and Karumudi Rambabu. "A Dual Band Branch Line Coupler With Wide Frequency Ratio." IEEE Access 7 (2019): 25046–52. http://dx.doi.org/10.1109/access.2019.2896646.

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Mattar, K. E., and M. E. Brodwin. "A variable frequency method for wide-band microwave material characterization." IEEE Transactions on Instrumentation and Measurement 39, no. 4 (1990): 609–14. http://dx.doi.org/10.1109/19.57242.

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Campbell, Paul G. "High power electroacoustic speaker system having wide band frequency response." Journal of the Acoustical Society of America 107, no. 4 (2000): 1812. http://dx.doi.org/10.1121/1.428520.

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Yu, Yufeng, Zhongxiang Shen, Tianwei Deng, and Guoqing Luo. "3-D Frequency-Selective Rasorber With Wide Upper Absorption Band." IEEE Transactions on Antennas and Propagation 65, no. 8 (2017): 4363–67. http://dx.doi.org/10.1109/tap.2017.2712812.

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Motlicek, Petr, Sriram Ganapathy, Hynek Hermansky, and Harinath Garudadri. "Wide-Band Audio Coding Based on Frequency-Domain Linear Prediction." EURASIP Journal on Audio, Speech, and Music Processing 2010 (2010): 1–14. http://dx.doi.org/10.1155/2010/856280.

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Newman, E. H. "Real frequency wide-band impedance matching with nonminimum reactance equalizers." IEEE Transactions on Antennas and Propagation 53, no. 11 (2005): 3597–603. http://dx.doi.org/10.1109/tap.2005.858816.

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Guo, Min, Qiang Chen, Tian Bai, Kelei Wei, and Yunqi Fu. "Wide Transmission Band Frequency-Selective Rasorber Based on Convoluted Resonator." IEEE Antennas and Wireless Propagation Letters 19, no. 5 (2020): 846–50. http://dx.doi.org/10.1109/lawp.2020.2981836.

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