A Design of Kuroda Low-pass filter Using DGS

In this paper, a new microstrip antenna using asymmetric U-shaped slotted ground is proposed for a switchable circular polarization sense. The proposed antenna is achieved a circularly polarization from orthogonal E-field distributions with 90 degree phase difference due to the asymmetrical U-shaped slot. Moreover, the circular polarization sense of the proposed antenna can be easily switchable with changing the symmetric plane of the U-shaped slots. As a result, the proposed antenna is implemented by two PIN diodes with two different bias condition for ON/OFF states. The measured axial ratios are about 1.5 dB without the dependence of the polarization sense and 3-dB axial ratio bandwidth are achieved 29 MHz with respect to about 1.2 % at 2.46 GHz operating frequency.

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Calculation of the Characteristic Impedance of Transmission Lines with Periodic Structures

Lim¹,

Lee²,

Lee³

et al. 2010

Journal of the Korea Academia-Industrial cooperation Society

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This paper describes the calculation for characteristic impedance of transmission line with periodic structures such as defected ground structure (DGS) and photonic bandgap (PBG). The previous method which uses the λ/4 transmission line model is reviewed and its disadvantage that the calculated characteristic impedance is strongly dependent on the frequency is discussed. The characteristic impedance of transmission lines with periodic structures are calculated using the λ/4 transmission line model and analytic method. The calculated characteristic impedance by the latter method is an almost constant value while that from the first method depends on the frequency strongly. In addition, the characteristic impedance of the transmission line with PBG is calculated and proposed, while it has been rarely studied ever. S-parameters are obtained from the measurement using the fabricated sample as well as simulation, and used for calculating the characteristic impedances and comparison. The characteristic impedances calculated from the measured S-parameters agree well with the simulated results. It is well described that the analytic method to calculate the characteristic impedance of transmission lines on uniform dielectric structures can be applied successfully to the transmission lines with periodic structures such as DGS and PBG.

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A Design of Kuroda Low-pass filter Using DGS

Cited by 4 publications

References 2 publications

A Design of Optimum Distributed Highpass Filter Using Defected Ground Structure

A Design of Optimum Distributed Highpass Filter Using Defected Ground Structure

A Switchable Circularly Polarized Microstrip Antenna using Asymmetric U-shaped Slotted Ground Structures

Calculation of the Characteristic Impedance of Transmission Lines with Periodic Structures

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