The combination of two higher order hybrid electromagnetic modes (HEM 133 and HEM 123 ) in a simple cylindrical dielectric resonator is exploited in the presented paper to enhance antenna gain. Both modes were excited by the same feeding aperture in the ground plane of a microstrip line. A linearly polarized, broadside radiation pattern with maximum realized gain of about 11.6 dBi was successfully obtained. The antenna was designed for the ISM band with central frequency 5.8 GHz and relative bandwidth at least 2.6 %. For fabrication, we used a layered Arlon AR600 substrate of relative permittivity 6.15. Experimental results showed reasonable agreement with simulations and validated the new concept of the high gain dielectric resonator antenna.Index Terms-Dielectric resonator antennas, directive antennas, higher order radiating modes.
Presented is the design of a planar lowpass filter with stubs separated by transmission lines. To minimise dimensions, the filter is completed by a fractal defected-ground structure (DGS). The fractal DGS filter requires a 20% smaller substrate compared to a conventional filter with stubs.
In this paper, we describe the design and simulation of on-body antenna for wireless body area network (WBAN) communication operating in the 61 GHz ISM frequency band. We developed a disc-like concept of an antenna. Instead of a direct connection between a circular disc and a feeding pin, the electromagnetic coupling is used. This concept enables us to obtain relatively broadband characteristics with omnidirectional radiation pattern and vertical polarization suitable for on-body communication. Impedance properties and radiation of the antenna were studied in open space and on a tissue-equivalent phantom representing the human body. Fabricated prototype is well matched from 59.3 GHz to 63.4 GHz. The bandwidth of the antenna is about 7%. Antenna analyzed close to body tissue exhibits efficiency at least 25 % and the maximum gain 5.2 dB in horizontal plane. Index Terms-Disc-like antenna, wearable antenna, body area network, body-centric communication, 61 GHz ISM band.
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