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 Abstract-A very small coplanar waveguide (CPW)-fed rectangular slot antenna with dual band notched characteristics for super ultrawideband (UWB) applications is proposed. This antenna consists of a rectangular slot, a beveled rectangular patch, two S-shaped slits cut in the ground plane and an elliptical ring slot (ERS) etched in the patch. The corners of a simple rectangular patch are beveled to improve the impedance bandwidth, especially at the middle frequencies of the band. In addition, a pair of semi-circle slots are etched in the ground plane to enhance the bandwidth to more than 23 GHz. A pair of S-shaped slits connected to the rectangular slot, and an elliptical ring slot cut in the beveled rectangular patch, are employed to create band notched performances in WiMAX and WLAN spectrum, respectively. The proposed antenna has a very small size of 15×15 mm 2 , and therefore it is one of the smallest ultra wideband slot antennas which have been reported until now, and provides a very wide impedance bandwidth from 2.6 to more than 23 GHz for VSWR<2 with dual band notched properties. Index Terms-S-shaped and elliptical ring slots, beveled rectangular slot, dual band-notched properties, semi-circle slot.0018-926X (c)

Frequency and time domain characteristics of a novel and compact triple band notched ultra wideband (UWB) monopole antenna are investigated. To realize UWB characteristics, the lower edges of a simple rectangular radiating patch are truncated and a new structure including a semi‐circle like ring stub is added to the rear side of the antenna. To avoid interferences with coexisting narrow band systems such as WiMAX, WLAN, and X band, two inverse L‐shaped slots, a semi‐circle like ring slot and two C‐shaped resonators are incorporated in the antenna geometry, respectively. The effect of the proposed antenna on a modulated Gaussian pulse as an excitation signal in different scenarios is fully studied. Moreover, the channel impulse response of a simple indoor environment is investigated when a pair of the proposed antennas are applied as transmitting and receiving antennas. Sub‐band divided ray tracing method based on the geometrical optics and uniform theory of diffraction is used to simulate the impulse response of the propagation channel. A frequency domain measurement campaign is also employed to measure the channel characteristics. The measured results are compared with those obtained from the simulations to validate the design procedure.

In this letter, a compact multiband microstrip‐fed planar monopole antenna is presented. The proposed antenna has three resonance modes which cover three bands of wireless standards including universal mobile telecommunications system band (1920–2170 MHz), 3.5 GHz worldwide interoperability for microwave access band (3.4–3.6 GHz), and 5.2 GHz wireless local area network band (5.15–5.35 GHz). The antenna has a simple structure which consists of a rectangular radiation patch with two symmetric folded slots for size reduction, a step‐shaped microstrip feed line, and a rectangular ground plane. Owing to fully printed, simple and small configuration, the proposed antenna fabrication is cost effective. The designed antenna has a total dimensions of 30 × 34×0.8 mm3 which makes this antenna a good candidate for mobile communication applications. The radiation characteristics such as gain, radiation patterns and radiation efficiency of the suggested antenna are investigated. The antenna radiates Omni‐directionally in H‐plane and bidirectionally in the E‐plane. In this design, very high radiation efficiency over the operating bands is obtained. According to the mentioned advantages, the proposed antenna can be a good choice for multiband wireless applications. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:844–847, 2016

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