Abstract-This letter introduces a DGS slot with an interdigital shape. The resonant frequency of the slot can be easily controlled by changing the length of the metal fingers, without changing the area taken by the structure. Using this slot, two quasi-elliptic lowpass filters were designed, fabricated and tested. The filters have a cut-off frequency of about 3 GHz.

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This paper presents the utilization of super resolution algorithms for the indoor positioning applications in order to estimate Time difference of Arrival (TDOA) and distances using OFDM transceiver. Optimal reduction in Distance Measurement Error (DME) is achieved. We have utilized OFDMlSC-DFE signal structure presented in our previous works. Three super resolution algorithms i.e. Estimation of Signal Parameters via Rotational Invariance Technique (ESPRIT), Root-Multiple Signal Classification (RootMUSIC) and Matrix Pencil (MP) are being compared for DME estimation. We have applied Minimum Descriptive Length (MDL) criteria to these algorithms, that provides optimize estimate of the length of actual CIR by eliminating the noise component from the dispersive CIR. Our scheme is based on two different antennas used to transmit the pre-half-zero-carriers and post-half-zero-carriers OFDM symbols respectively, mapped to multiple carriers using Wireless Local Area Network (WLAN) system and received by a single to be positioned object. An analysis of DME estimation is presented for varying Signal to Noise Ratio (SNR). DME reduction approaching to zero is achieved by the MP algorithm using our scheme.

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