The National Institute of Information and Communications Technology (NICT) has been studying a new mobile communication system, named Satellite-Terrestrial Integrated Mobile Communication Systems (STICS)[1]. The STICS is a mobile phone system in which terrestrial mobile and satellite communication systems coexist, and is seamlessly integrated in the same frequency band. We aim for the realizati...

This paper describes the requirements of the antennas or antenna systems in recent high-speed and high-capacity wireless communication systems and the key technologies for satisfying them. It also explains the antennas and antenna systems being researched and developed for next-generation wireless communication systems. The antenna in such a system requires high gain, high-efficiency antenna el...

In this paper, a microstrip-fed hexagonal shape ultra-wideband (UWB) monopole antenna with triple notched bands is presented. The antenna consists of a microstrip feed line, a regular hexagonal shape radiation patch with a complementary split ring resonator (CSRR) and a pair of inverted T-shaped conductor-backed planes embedded in the antenna backside. Notched bands can be easily controlled by ...

In this paper, the performance of a digital beam steering antenna array, developed by NAVSYS Corporation, is presented for high accuracy differential and kinematic GPS applications. The NAVSYS’ High Gain Advanced GPS Receiver (HAGR). uses digital beam-steering to combine signals from an antenna array with up to sixteen elements and create a multi-beam antenna for up to eight GPS satellites simu...

A compact size, multiband 2x2 array of circular microstrip antenna has been proposed. The antenna array consists of Genetic Algorithm (GA)optimized, annular slotted circular microstrip antenna elements using probe feed. The spacing of elements has also been optimized using GA in the two directions. The performance of the antenna array has been studied with different shape parameters. The optimi...

In this work defective ground structure monopole antenna is designed for wireless applications. The proposed antenna having an E-shaped slot on a patch with two backward slits and H-Shaped defect on a ground plane .The antenna exhibits its response on working band of 4-6 GHZ with an impedance bandwidth of 2 GHZ .In this work the radiation characteristics like return loss, gain, radiation patter...