We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Design of a Microstrip Filtering Balun with a Wide Stopband.
- Authors
Jun-Mei Yan; Liang-Zu Cao; Hai-Ying Zhou
- Abstract
A microstrip filtering balun with a wide stopband is presented. Its filtering function is realized by four meandering stepped impedance resonators (SIRs). Except for an identical fundamentalmode resonant frequency, the SIRs have different high-order resonant frequencies. Thus, the parasitic passbands are suppressed, and a wide stopband is achieved. The unbalance-to-balance transition is accomplished by introducing two coupling output ports at two symmetry positions of the output SIR. The voltages at symmetrical positions have equal magnitudes and opposite phases, thus, signals coupled from the symmetrical positions also have equal magnitudes and opposite phases, i.e., balanced output signals are achieved. A more general design approach is discussed in detail, and the proposed approach is similar to the design method of the conventional filter except that a small modification is made. Additionally, two kinds of external coupling structures, microstrip coupling lines and tapped line, are compared in terms of stopband performance. The comparison shows that better stopband performance is observed when utilizing the microstrip coupling lines as the external coupling structure. A filtering balun with central frequency of 2.4GHz and Chebyshev frequency response is designed, fabricated and measured. The measured results give a reasonable agreement with the simulated ones, which verifies the effectiveness of the filtering balun.
- Subjects
MICROSTRIP antennas; ENERGY bands; FABRICATION (Manufacturing); SIGNAL processing; SIMULATION methods &; models
- Publication
Progress in Electromagnetics Research C, 2016, Vol 70, p63
- ISSN
1937-8718
- Publication type
Article
- DOI
10.2528/pierc16093003