The nearest decade development of radio-electronics will be to a great extent related with the mastering of millimeter and submillimeter wave band. This process is considerably stimulated by a great success in development of electronic components for millimeter and sub-millimeter wave bands. So, substantial progress has been achieved in the field of development and production of key componentssufficiently reliable sources of oscillation in the stated bands. Development and putting ferrite devices and apparatus into industry production is one of the key problems of millimeter and sub-millimeter wave band mastering. The ferrite devices are known to be the main type of non-reciprocal passive devices in microwave range. Rather substantial role belongs to ferrite devices in the field of propagation conditions control for the waves in this range. In the present paper the authors consider state-of-art, achieved level of development and the nearest perspectives of creation of ferrite devices for the stated range. The consideration is carried out on the basis of example of typical ferrite devices: non-reciprocal (isolators and circulators) as well as controlled ones (filters and phase-shifters). Just these groups of devices define the state-of-art and the level of development of ferrite device engineering.
The excitation of traveling magnetostatic, magnetoelmtic, and acoustic waves by means of rf magnetic field was observed previously in Y-Fe garnet PIG) (l).We present here experimental results on excitation of such waves in single-crystalline Ca-Bi-V-Fe garnet. This substance has nearly the same linewidth (2) as YIG. But its saturation magnetization (2) and the effective magnetoelastic interaction constant (3) are coneiderably less than those reported for YIG.The specimen used was a rod (1 = 0.6 cm, d = 0.18 cm) with the axis nearly parallel to the [110] dirwtion and optically flat end faces. The specimen was placed in a uniform external d\: magnetic field Ho parallel to its axis. Thin wire' antenna provided r f magnetic field perpendicular to Ho. The experiments were performed at mom temperature in the frequency band 300 to 2000 MHz with power input in the milliwatt range. Standard pulse echo technique was used; the experimental apparatus has been descrmed elsewhere (1). Short microwave pulses ( ul ps) were applied to one end of the sample, and echoes were observed at the opposite end. Oscilloscope traces typical of propagation of various modes are shown in Fig. 1. The first echo transit time 71 and the insertion loss N1 are plottad in Fig. 2 as a function of Ho.width of this pulse is larger than the input pulse width because of the strong disAt low values of Ho the magnetostatic echo pulse is observed (Fig. la). The persion. The delay time T~ of this echo increased rapidly with the increase of €Io from nearly zero up to 7.5 pa. The observed 'tlm0) dependence shown in Fig. 2 6 physica
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