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A uniplanar compact photonic-bandgap (UC-PBG) structure and its applications for microwave circuit

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4 Author(s)
Yang, Fei-Ran ; Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA ; Ma, Kuang-Ping ; Yongxi Qian ; Itoh, T.

This paper presents a novel photonic bandgap (PBG) structure for microwave integrated circuits. This new PBG structure is a two-dimensional square lattice with each element consisting of a metal pad and four connecting branches. Experimental results of a microstrip on a substrate with the PEG ground plane displays a broad stopband, as predicted by finite-difference time-domain simulations. Due to the slow-wave effect generated by this unique structure, the period of the PBG lattice is only 0.1λ0 at the cutoff frequency, resulting in the most compact PEG lattice ever achieved. In the passband, the measured slow-wave factor (β/k0) is 1.2-2.4 times higher and insertion loss is at the same level compared to a conventional 50-Ω line. This uniplanar compact PBG (UC-PBG) structure can be built using standard planar fabrication techniques without any modification. Several application examples have also been demonstrated, including a nonleaky conductor-backed coplanar waveguide and a compact spurious-free bandpass filter. This UC-PBG structure should find wide applications for high-performance and compact circuit components in microwave and millimeter-wave integrated circuits

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:47 ,  Issue: 8 )