In this article, a single layer unit cell reflectarray antenna comprising a fixed square patch to which is attached a lattice of symmetric open ended stubs is proposed. The phase response of the proposed unit cell element is governed by the length of the lattice, providing more than 600° of reflection phase variation. The unit cell element of 0.54λ0 × 0.54λ0, has a thin dielectric substrate thickness of 0.036λ0 and is placed above an air layer making the overall unit cell thickness of 0.126λ0. A 15 × 15 elements Ku‐band reflectarray antenna is designed with an area of 18 × 18 cm2. The reflectarray is center fed by a linearly polarized pyramidal horn antenna. The planar reflectarray antenna is fabricated and has wide −1 dB gain bandwidth, about 20% covering 12.1–14.8 GHz. The measured antenna gain at 13.5 GHz is 25 dB which is equivalent to 39% efficiency. The proposed unit cell and the reflectarray antenna are simulated through CST and HFSS software packages. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2699–2702, 2015

A compact ultrawideband microstrip‐fed monopole antenna with two band notch property is presented.The antenna consists of a truncated elliptic patch with half wave arc slot and two parasitic bent elements in both side of the radiating patch. It is designed with half elliptic ground plane in the back of the radiating patch. The antenna provides an enhanced impedance matching characteristic over the desired frequency band, with variable dimensions which are used to generate the frequency band stop performance in wireless local area network and the worldwide interoperability for microwave access frequency bands. The antenna is designed and measured successfully. The measured results show that this antenna operates over the frequency band between 2.2 and 11.5 GHz for S11 < 10 dB, while showing the band rejection performances in the frequencies band of 3.2–3.8 GHz and 5.2–5.8 GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2659–2662, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27130

A compact ultrawideband CPW‐fed monopole antenna is presented that includes dual band‐notch characteristics. The antenna consists of a modified V‐shaped patch with two resonant structures to create the required band‐notch function at the desired frequency bands to mitigate interference from WLAN and WiMAX systems. The band‐notch structures comprise of a rectangular‐shaped conductor backed plane and a rectangular‐shaped slot inserted within the antenna patch. The center frequency of the band‐notch can be varied prior to fabrication without affecting the antenna's overall characteristics. The antenna's performance was verified through measurements, which show that it operates across a large bandwidth between 2.9 and 12.7 GHz for VSWR <2 and provides band reject performance between 3.3–3.8 GHz and 5.2–5.8 GHz. The antenna's dimensions are 19.5 × 21 × 1 mm3. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1840–1845, 2013