Abstract-In this paper, a stage wise realization of compact Bluetooth -UWB dual-band diversity antenna with WiMAX and WLAN band-notch characteristics is presented.The proposed structure consists of two co-planar semicircular dual band-notch monopole antennas, mounted with planar spiral. Individual antenna configuration provides an impedance bandwidth (VSWR < 2) for dualband i.e., both Bluetooth and UWB bands. For dual band-notch characteristic, two sets of spirals are capacitively coupled with the feed line of antenna. This configuration provides band-notch (VSWR < 2) for WiMAX i.e., (3.3-3.6 GHz) and WLAN (5.13-5.85 GHz) bands. For enhancing reception capabilities of the proposed structure, twin coplanar antennas are used to fulfill diversity requirements. However, due to coplanar and close proximity to each other, there is high possibility of mutual coupling between coplanar antenna elements. To address the mutual coupling between elements, cross-strip variablesized frequency selective structures are used. Antenna diversity of the proposed structure is validated by measuring radiation pattern characteristic and envelop co-relation factor (ECC). A good agreement between measured and simulated responses ensures that the proposed diversity antenna can be used for interference free Bluetooth/UWB dual-band applications.
Coaxial TEM to circular waveguide TM 01 mode transducer designs with wide bandwidth and compact size are presented in this paper. The coaxial feed with its centre conductor extended as a cone, is applied at the axis of a circular waveguide. Further modifications in the conical shape monopole are proposed (skirt and inverted cone), which result in a wide bandwidth (28.5% and 33.8% respectively) of TM 01 mode excitation in a circular waveguide. Many of the High Power Microwave (HPM) sources generate output signal in the form of TM 01 mode of circular waveguide. The proposed transducer is useful for low power calibration of an antenna or a mode converter designed for high power microwave applications.
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