The paper presents research results in the field of small antennas obtained at the Department of Wireless Communications, Faculty of Electrical Engineering and Computing, University of Zagreb. A study comparing the application of several miniaturization techniques on a shorted patch antenna is presented. Single and dual band shorted patch antennas with notches and/or slot are introduced. A PIFA...

We are working toward actualizing a real-time 3D modeling system that uses a sensor network consists of many 1mm3-class sensor nodes in plastic clay. This paper focuses on 1mm3-class small antenna and discusses the feasibility of near-field communication with such small antennas. In order to clarify communication characteristics for evaluating the feasibility, we designed 1mm3-class spiral ante...

The investigations on U-slot loaded and V-slot loaded proximity coupled microstrip antennas are reported. The performances of two antennas are investigated in frequency band of high performance wireless local area network (HIPERLAN/2) using IE3D software and the computed results are verified by measurement. Results show that the antennas have wide bandwidth and moderate gain and may be used as ...

Modern military uses of antennas have presented new challenges to the antenna designer. Only a decade ago, specific band antennas, or tall whips, met the needs of most communications, electronic warfare (EW) and surveillance applications. But with new needs and transceiver technologies, antennas have new challenges: wideband; small; and agile platforms, for software-defined radio (SDR) and mode...

Terahertz plasmonic resonances in semiconductor (indium antimonide, InSb) dimer antennas are investigated theoretically. The antennas are formed by two rods separated by a small gap. We demonstrate that, with an appropriate choice of the shape and dimension of the semiconductor antennas, it is possible to obtain large electromagnetic field enhancement inside the gap. Unlike metallic antennas, t...

MIMO (Multiple Input Multiple Output) technology has been regarded as a practical approach to increase the wireless channel capacity and reliability. In this technology, the performance of multiple antennas has a significant effect on the MIMO channel capacity. Currently, the MIMO channel capacity is mostly evaluated without accounting for the practical aspects of multiple antennas. Though mult...

Electrically small antennas are needed to further lower the cost of wireless elements. However, the antenna gain is constrained to the Harrington limit, while the impedance matching and directivity characteristics deteriorate in electrically small antennas. Using a dipole antenna loaded with a left-handed ladder structure is a promising technique for reducing the size of antennas. In this lette...