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

Author

Yang, Fei-Ran ; Ma, Kuang-Ping ; Qian, Yongxi ; Itoh, Tatsuo

Author_Institution

Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA

Volume

47

Issue

8

fYear

1999

fDate

8/1/1999 12:00:00 AM

Firstpage

1509

Lastpage

1514

Abstract

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

Keywords

band-pass filters; coplanar waveguide components; finite difference time-domain analysis; microstrip circuits; microstrip filters; microwave filters; microwave integrated circuits; microwave photonics; millimetre wave integrated circuits; passive filters; photonic band gap; 2D square lattice; FDTD simulations; MM-wave integrated circuits; PBG structure; compact photonic-bandgap structure; coplanar waveguide; microstrip; microwave ICs; microwave circuit applications; nonleaky conductor-backed CPW; slow-wave effect; spurious-free bandpass filter; standard planar fabrication techniques; uniplanar photonic-bandgap structure; Displays; Finite difference methods; Joining processes; Lattices; Microstrip; Microwave integrated circuits; Photonic band gap; Photonic integrated circuits; Predictive models; Time domain analysis;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.780402

Filename

780402