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Semiconductor crystals have generally shown facet‐dependent electrical, photocatalytic, and optical properties. These phenomena have been proposed to result from the presence of a surface layer with bond‐level deviations. To provide experimental evidence of this structural feature, synchrotron X‐ray sources are used to obtain X‐ray diffraction (XRD) patterns of polyhedral cuprous oxide crystals. Cu...
A switchable tunable dual-band filter using varator diodes for band switching and frequency tuning is proposed. The tuning range of first band is from 2.3 to 2.8 GHz and second one is from 1.8 to 2.1 GHz. The proposed dual-band filter is composed of two second-order Chebyshev short-ended hairpin comb filters which embedded a pair of the varators as a switching and tuning elements. The simulated and...
A novel filter bank using serial-switched structure for the commercial bands of Band40, WIFI, and Band38 application is proposed. The proposed triple-band filter bank adopt the three order Chebyshev short-ended hairpin comb filters which embedded a pair of the PIN diodes as a switch. The simulated and measured results are matched well.
Novel full- and half-symmetric rat-race ring hybrid structures are proposed, in which the impedance transforming property can be implemented. Impedance transformation implies that the impedances of the input and output ports can be different. The conventional even- and odd-mode partition and analysis method cannot be applied to the proposed half-symmetric circuits; therefore, an analysis method is...
A Single pole double throw (SPDT) switch using the packaged PIN diodes for X-band application is proposed. The SPDT switch is embedded in two Chebyshev three-stub filters where one of the three stubs is substituted by the PIN diode and peripheral circuits. The high value of parasitic inductance in the package is absorbed by the filter with a proposed novel resonator structure. The simulated and measured...
W-band T-junction and bifurcated substrate integrated waveguide (SIW) diplexers are proposed in this paper. Instead of conventional 0.127 mm substrate for W-band circuitry, a 0.254 mm substrate is chosen for Q-value improvement A WR-10 waveguide to 0.254 mm SIW E-plane transition is developed for measurement purpose. Two diplexers are implemented.
A new broadband high-order planar magic-T is proposed in this paper. The magic-T is formed by Marchand type power divider and balun. Exact synthesis method based on S-domain highpass prototype using Richard's theorem fits the magic-T with the user-defined specifications. By discussing the characteristic impedance of the common element shared by the balun and divider, the magic-T can be designed to...
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