Abstract-In this paper, a compact quad-band planar inverted-F antenna (PIFA) for wireless communication systems is presented. The proposed PIFA consists of a radiating patch with a hookshaped slot and a modified ground plane with pair of square-ring and rotated I-shaped slots. The antenna is fabricated on an FR4 substrate with dielectric constant of 4.4. By cutting a hook-shaped slit at radiating patch, good dual-band property can be achieved which covers 3.5 GHz worldwide interoperability for microwave access (WiMAX) and 5.2 GHz wireless local area network (WLAN) frequencies. In addition, by using a modified ground plane with a rotated I-shaped an the pair of square-ring slot, additional resonances at the higher frequencies are generated which suitable for 7.25-7.75 GHz downlink of X-band satellite communication systems and 8.02-8.4 GHz international telecommunication union (ITU) applications. Good return loss, antenna gain and radiation pattern characteristics are obtained in the frequency band of interest. The proposed antenna has a small dimension of 24 × 3 × 1.6 mm 3 .
In this article, a compact microstrip band‐stop filter with 3–11.2‐GHz bandwidth for ultrawideband applications is proposed. The microstrip filter configuration consists of a transmission line with a pair of C‐shaped strips as a stub, four arc‐shaped slots embedded inside them, and a ground plane. An excellent agreement between measured and simulated results was obtained. The proposed microstrip filter fabricated on a Rogers RT/Duroid 5880 substrate with a relative dielectric constant of 2.2 and has a very small size of 10 × 15 × 0.635 mm3. The proposed filter configuration is simple, easy to fabricate, and can be integrated into any radar system. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:709–711, 2014
This article presents a new design of ultrawideband (UWB) monopole antenna with the characteristics of dual band rejection .The antenna consists of a square radiating patch with U‐shaped slot and a pair of Γ‐shaped slits, and a ground plane with an open‐circuit slit which provides a wide usable fractional bandwidth of more than 120%. By applying the open‐circuit slit in the ground plane, a new resonance at 12.1 GHz is excited and much wider impedance bandwidth can be produced. The band notching of wireless local area network (5–6 GHz), is achieved by inserting a U‐shaped slot, and a band‐notching for downlink of X‐band satellite communication systems (7.25–7.75 GHz) is obtained by embedding two Γ‐shaped slits at square radiating patch. The simulated and measured results show that the antenna design exhibits an operating bandwidth (VSWR<2) from 2.86 to 12.92 GHz excluding the rejected bands. The proposed antenna configuration is simple, easy to fabricate and can be integrated into any UWB system. The proposed antenna has a symmetrical structure which improves the antenna radiation pattern characteristics. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2910–2915, 2013
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