This dissertation focuses on designing, fabricating and testing antennas that are suitable for operation within the V/W bands. In particular, this work focuses on the design of slotted rectangular waveguide antenna arrays and cross slotted waveguide fed horn antennas. These structures are known for their high efficiency and high circularly polarized gain that can be implemented in satellite and...

The loop antenna, in common use in the 3-30MHz band, was reassessed in a recent paper in which it was considered as a folded dipole, with suggested theoretical advantages. This paper demonstrates that the two lowest-order modes which exist in small loop antennas correspond to the true loop, otherwise known as the magnetic dipole (zero-order mode) and the folded dipole (first-order mode), and sh...

An ultra-compact dual-band printed antenna is proposed. Connective and concentric double split rings (CCDSR) are used to generate two resonant frequencies in wireless local area network (WLAN) frequency bands. Tuning arms are added to the microstrip fed line, which can be used to tune the upper frequency band. The dimension of this antenna is only 9 × 24 × 1 mm3, much smaller than those reporte...

The Design of hexagonal patch is presented withsingle coaxial feed namelysimple hexagonalpatch,hexagonal patch with one triangular slot in ground for circular polarization. The circular polarization of two antennas are obtained with 1.31% axial ratio(AR) for simple hexagonal patch, 4.43% axial ratio hexagonal patch with slotted ground hexagonal patch antenna. The impedance band widths of these ...

This paper gives a broad description of a broadband communication system using the 60 GHz frequency band. We describe the channel and its inherent problems such as interference situations and body shadowing. We introduce the use of Virtual Cellular Networks (VCN) and multiple receiving antennas (MRA) in order to solve these problems resulting in an overlapping cellular architecture. We explain ...

In the days of modern communication, the compact size, low profile antenna with the directional capability is demanded for the wireless communication applications. To fulfill this requirement two new structures of antennas are designed. Two different geometries of microstrip antenna for triple band and Tetra band operation have been investigated in this paper with a new concept of T-slot in the...

Radio Frequency Identification (RFID) systems operating in the Ultra High Frequency (UHF) band, are exposed to fading. While state-of-the-art RFID systems employ multiple antennas, with random selection of a single receive path to obviate the performance losses, this paper proposes to employ antenna diversity by the combination of all paths applying maximal ratio combining. An experimental perf...

This paper proposes two rectangular ring planar monopole antennas for wideband and ultra-wideband applications. Simple planar rectangular rings are used to design the planar antennas. These rectangular rings are designed in a way to achieve the wideband operations. The operating frequency band ranges from 1.85GHz to 4.95GHz and 3.12GHz to 14.15GHz. The gain varies from 1.83 dBi to 2.89 dBi for ...