The spatial network method can analyze a three-dimensional electromagnetic field, including time response. But, no paper has discussed a matching condition of a microstrip line in detail. In this paper, we have clarified a generalized procedure to obtain the maching condition using resistor and capacitor at the terminal plane of the microstrip line.

The analysis of the coupling characteristics between lines becomes more important because of the progress of high density wiring and large integration. The problems can be treated as energy flow which is represented by the Poynting vector. On this view point, we present the variation of the Poynting vector for crossing striplines on time and space.

In this paper, the fundamental characteristics of wave propagation in a through-hole is reported by presenting of time variations of the Poynting vector and the electric fields in three-dimensional space and time.

This paper describes the design of a 38-GHz high power MMIC amplifier using an improved load-pull technique. We improved the load-pull technique accuracy by using MMIC transtormers to match the input and output impedances of a GaAs MESFET to about 50 ohms. We used this technique to measure the large-signal load impedance of a FET with a 600-µm-wide gate. Using the data obtained, we developed an MMIC amplifier composed of two of these FET cells. At 38 GHz, the amplifier has an output power of 23.5 dBm for a 1 dB gain compression level.

Recently, with development of microwave technology, striplines with various shapes have been used and the analysis for these striplines has become complex. In this paper, we deal with the microstrip side-coupled filter that should be analyzed in three-dimensional space and time by Bergeron's method. The transient analysis of the electromagnetic field is not only useful in clarifying the field response but also yields information on the mechanism by which the distribution of the electromagnetic field in the stationary state is brought about. Firstly in order to know fundamental property of the parallel striplines, the characteristic impedance and the relative phase velocity of the lines are evaluated. Then, the appearance of the band-pass characteristics of the filter is successively shown by the presentation of the electromagnetic field distribution and the Poynting vector in time domain.