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The ultrawideband (UWB) planar antenna is designed as a circular metallic patch fed by a coplanar waveguide (CPW). This antenna provides the impedance bandwidth of the wideband response from 2.5 to 12 GHz. To achieve the notched characteristics at desirable frequencies, the electric ring resonator (ERR) incorporated into the CPW feedline is proposed for use in the planar configuration of the UWB antenna...
An all-pass constant-phase 2-port network that contains negative capacitances and behaves as a perfectly matched phased inverter in an almost unlimited frequency range is proposed. The unique network properties are explained using the even-odd mode analysis technique as well as in terms of immittance inverters. Different aspects of practical implementation of the network with the negative capacitances...
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