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Net-type resonators with dual- and tri-mode electrical behaviors have been presented and analyzed theoretically in this paper. The proposed net-type resonator is constructed by a short-ended and several open-ended transmission-line sections, which has the advantages of small size and more flexible resonant frequency allocation and is therefore particularly suitable for applications to the design of...
This paper proposes a triple-band branch-line coupler design by substituting the λ/4 transmission lines in the conventional branch-line coupler by II-shaped circuits composing of transmission lines, LC resonators and open stubs. The coupler is designed on a printed circuit board (PCB). Surface mount device (SMD) capacitors are used for the LC shunt resonators. The operated frequencies of this coupler...
A compact waveguide magic-T design composed of open-ended microstrip lines and laminated waveguide in multilayer LTCC technology is proposed. Two orthogonal slots are used to excite even- and odd-symmetric field patterns, respectively, resulting in a good isolation between each other. An X-band waveguide magic-T is developed in LTCC to validate the proposed topology. The measurements agree well with...
This paper proposes a vertical transition between microstrip line and substrate integrated waveguide (SIW) on multilayer low-temperature co-fired ceramic (LTCC) as well as its equivalent circuit model. The transition structure is realized by a shorted via between microstrip line and the bottom of SIW. The equivalent model is derived by calculating the input impedance in waveguide and the simulation...
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