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In this article, an effective design method is presented to design a miniaturized UWB antenna with four band-notches. By carefully integrating C-shaped slots, L-shaped open circuit stub, and T-shaped parasitic strip onto the primitive miniaturized antenna, four band-notches (VSWR > 2) could be achieved at 3.38-3.65 GHz, 4.95-6.05 GHz, 7.42-7.78 GHz, and 8.1-8.9 GHz to reject WiMAX, WLAN, X-band satellite communication, and ITU 8 GHz band signals. Simulated and measured results show that this antenna could operate from 3.15-11.1 GHz (VSWR < 2), and maintain omnidirectional directivity patterns at H-plane. Moreover, the proposed antenna has a very compact size of 18.6 × 22 × 1.5 mm3. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1202-1206, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27546 [ABSTRACT FROM AUTHOR]

In this article, using a novel structure, simulated and measured microwave characteristics from substrate integrated waveguide photodetector (SIWPD) are obtained and compared with the conventional microstrip waveguide photodetector. A Ka-band microstrip to rectangular waveguide multilayer transition for OC-768/STM-256 optical systems is designed and fabricated. Attenuation constant results shows that by replacing substrate integrated waveguide (SIW) instead of conventional microstrip in waveguide photodetectors, operation frequency can be increased. Microwave fields in the proposed structure show a good transition from quasi-TEM mode to TE10 mode in multilayer structure. The multilayer structure is considered to separate SIW and DC bias of the photodetector. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2204–2207, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24528 [ABSTRACT FROM AUTHOR]

The propagation and loss characteristics of the substrate-integrated rectangular waveguide (SIRW) at microwave and millimeter-wave bands are investigated. The results further verify that the substrate-integrated rectangular waveguide has nearly the same waveguide characteristics as conventional rectangular waveguides, and it can be analyzed as a rectangular waveguide with effective width of the SIRW. The insertion loss of SIRW and its equivalent rectangular waveguide agree well with each other. However, it is observed that the derivation of the propagation characteristics of the SIRW and its equivalent rectangular waveguide indicates the frequency dependency. At the X-, K-, and Ka-bands, the effective width of the equivalent rectangular waveguide given by the empirical formula [7] should be slightly increased in order to obtain the propagation characteristic that agrees better with that of the SIRW, about 2%. In addition, at the U-band, when the effective width of the equivalent rectangular waveguide is increased 5% or so, the propagation constant of the rectangular waveguide in the whole band agrees well with that of the rectangular waveguide. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 588–592, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21059 [ABSTRACT FROM AUTHOR]

A new phased-array driver module for a two-antenna array is proposed in this paper. This driver, designed using a six-port phase discriminator, automatically controls the phase of one antenna-array element in order to maximize the received power. The results for a phased two-antenna array operating at 2.45 GHz are presented and discussed. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 346–349, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20983 [ABSTRACT FROM AUTHOR]