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A newly asymmetrical spurline structure is presented in this article. Its dual-bandgap characteristics are reported and can be adjusted by changing the length difference between spurlines. Then, a simple circuit model is set up for the spurline structure by using two LCR-resonators and the circuit parameters can be extracted from EM simulations. Moreover, a Wilkinson power divider using the proposed spurlines was designed, fabricated, and measured. Experimental results verify that 27-dB suppression for the second harmonic and 30-dB suppression for the third harmonic are obtained, respectively. In addition, the reflection coefficients are -3.5 dB ± 0.3 dB (-3 dB for ideal case) below 3.8 GHz and -3.7 dB at the operating frequency 3.12 GHz. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 601–604, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23172 [ABSTRACT FROM AUTHOR]

Without any perturbations on the surface of the patch resonator or orthogonal feed lines, new microstrip dual-mode triangular-patch bandpass filters are presented in this article. The degenerate modes are excited by the use of the spur-lines for input/output microstrip lines. Also, the influence of design parameters on the frequency characteristics of the proposed dual-mode filters is discussed. In addition, a modified dual-mode filter using double-spur-lines is introduced and simulated. Measurement verifies the validity of the introduced design method. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2100–2103, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21880 [ABSTRACT FROM AUTHOR]

A novel dual-mode DC-block bandpass filter (BPF) using a pair of V-shape slots on triangular-patch resonators is developed in this letter. The V-shape slots perturb the field distributions of triangular-patch resonators and excite degenerate modes. Compared to our previous research, the length of input/output (I/O) lines of the proposed filter is reduced so that the circuit becomes compact. Finally, the good agreement between the simulated and measured results of the proposed BPF is presented. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1648–1649, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22520 [ABSTRACT FROM AUTHOR]