This article presents a novel design and development of dual‐notched U slots rectangular microstrip antenna for quad band tunable operation. The antenna operates between 3.45 and 8.75 GHz at four different frequency bands. The middle two bands merge into a single band by changing the width of U slot on the patch. This change will also effect in tuning the three bands on either side of the frequency spectrum without changing the nature of linearly polarized broadside radiation characteristics. The proposed antenna gives a peak gain of 1.52 dB. The experimental and simulated results are in good agreement with each other. A design concept of the antenna is given and experimental results are presented and discussed. This antenna may find applications in WLAN, WiMax, and the fourth generation mobile communication systems. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:509–513, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27372

A novel design of corner truncated U‐slot rectangular microstrip antenna is proposed for triple band operation. The middle and upper bands are tuned from 4.615 to 4.5 GHz and 5.919 to 5.88 GHz, respectively, when the width of vertical arm of U‐slot is varied from 0.1 to 0.2 cm. If the width of vertical arm of U‐slot is varied from 0.2 to 0.3 cm, these bands are tuned to opposite direction from 4.615 to 5.795 GHz and 5.919 to 8.315 GHz, respectively, without changing the resonant frequency of primary band and nature of broadside radiation characteristics. The experimental and simulated results are in good agreement with each other. Design concepts of antennas are presented and experimental results are discussed. These antennas may find applications in WLAN. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:614–617, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26646

This paper presents the design and development of corner truncated rectangular microstrip antenna comprising U and inverted U-slot for multiband tunable operation, wide impedance bandwidth, and high gain. By incorporating U and inverted Uslots of optimum geometry on the radiating patch the proposed antenna operates between 3 to 12 GHz at different frequency bands and giving a peak gain of 1.73 dB without changing the nature of broadside radiation characteristics, compared to conventional rectangular microstrip antenna. The experimental and simulated results are in good agreement with each other. Design concepts of the antenna are given. The experimental results are presented and discussed. The proposed antennas may find applications in WiMax, HIPERLAN/2, and radar communication systems.

relatively wide bandwidths are 360 and 500 MHz, respectively. In addition, the attenuation in both stopbands as well as the passband return loss values are well represented in the measurements and agree well with simulations. Thus, the experimental results verify the simple design approach and give rise to filter designs involving multiple stopbands. CONCLUSIONA dual-stopband SIW filter based on quarter-wavelength Hplane stubs is presented. The initial design uses six shunt LC circuits that are capable of producing three TZs in each stopband. The acceptable accuracy of the prototyped dual-stopband filter's response compared to that of simulations verifies the reliability of the design and demonstrates a viable option for dual-stopband filters in SIW technology. REFERENCES 1. R.J. Cameron, M. Yu, and Y. Wang, Direct-coupled microwave filters with single and dual stopbands, IEEE Trans Microwave Theory Tech 53 (2005), 3288-3297. 2. K.S. Chin, J.H. Yeh, and S.H. Chao, Compact dual-band bandstop filters using stepped-impedance resonators, IEEE Microwave Wireless Compon Lett 17 (2007), 849-851. 3. J. Wang, H. Ning, Q. Xiong, M. Li, and L. Mao, A novel miniaturized dual-band bandstop filter using dual-plane defected structure, Prog Electromagn Res 134 (2013), 397-417. 4. K. Rambabu, M.Y. Chia, K.M. Chan, and J. Bornemann, Design of multiple-stopband filters for interference suppression in UWB applications, IEEE ABSTRACT: This article presents an aperture coupled dual ground back fed rectangular microstrip antenna for wideband operation. The bandwidth is enhanced by varying the width of S-shaped slot placed on the patch and the gap between the feed line on the ground plane of the antenna. The proposed antenna operates between 4 and 16 GHz of frequency range and gives a peak gain of 4.32 dB. The enhancement of bandwidth does not alter the nature of broadside radiation characteristics. The experimental and simulated results are in good agreement with each other. Design concepts of the antenna are given. The experimental results are presented and discussed. The proposed antennas may find applications in WiMax of IEEE802.16d, HIPERLAN/2 and radar communication systems.