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A broadband vertically interdigital‐capacitor (VIC) is proposed and fabricated in a 10‐layer low temperature co‐fired ceramic substrate. By interconnecting the open ends of interval fingers, the number of stop‐band structures is reduced and thus the spurs that limit the bandwidth are removed. With the orthogonally placed input/output ports, the amplitudes of transmission coefficient and reflection coefficient are also improved. Thus, the high frequency response of VIC is improved. The bandwidth and capacitance of the proposed VIC increased 225% and 28%, respectively. The proposed VIC is available to make compact microwave components in a wider frequency rage. Comparison and discussion are provided as well. [ABSTRACT FROM AUTHOR]

A wideband and compact rat‐race coupler that covers 3 to 5 GHz is proposed for the fifth‐generation new radio N77/N78/N79 applications. The wideband characteristic is obtained by using cascaded two‐section topology and broadside‐coupled lines at each input/output port. Miniaturization of two‐section rings is achieved using meander microstrip lines. A fractional bandwidth of 50% and a size reduction of 60% are both reached. Good in‐phase and out‐of‐phase characteristics are obtained as well. The circuit can be easily fabricated using conventional printed circuit board process and suitable for mass production. [ABSTRACT FROM AUTHOR]