| Patent Number |
Title Of Patent |
Date Issued |
| 5432842 |
Mobile communication switching across cell boundaries |
July 11, 1995 |
| With respect to a mobile communication system, intelligence learns a cell boundary where the field strength of adjacent base stations becomes equal, by measuring field strength of communications, and from this data determined and stored over a period of time, the intelligence calculates |
| 5168254 |
Magnetostatic wave device with minimized higher order mode excitations |
December 1, 1992 |
| A magnetostatic wave device has a nonmagnetic substrate, a magnetic thin film formed on the nonomagnetic substrate, and a plurality of electrodes. By applying a magnetic field from the outside in parallel with or perpendicularly to the magnetic thin film, a magnetostatic wave is excited |
| 5053734 |
Magnetostatic wave device |
October 1, 1991 |
| A magnetostatic wave device comprises a magnetic thin film formed on a non-magnetic substrate, one or a plurality of electrode fingers and pad electrodes formed on the above described magnetic thin film, a magnetostatic wave resonator for exciting and propagating a magnetostatic wave |
| 4992760 |
Magnetostatic wave device and chip therefor |
February 12, 1991 |
| A chip for a magnetostatic wave device comprising; a base substrate consisting of a dielectric monocrystalline base plate and a ferrimagnetic monocrystalline film formed on the base plate; an excitation means for magnetostatic waves formed on the ferrimagnetic film when it is given a |
| 4983937 |
Magnetostatic wave band-pass-filter |
January 8, 1991 |
| A magnetostatic wave band-pass-filter is disclosed which uses a planar structure, it has, a single crystal thin film formed on a single crystal gadolinium gallium garnet substrate and mainly containing yttrium iron garnet. In this band-pass-filter, input and output electrodes each made u |
| 4790000 |
Portable radio telephone system |
December 6, 1988 |
| In order to make it possible to communicate between a portable radio telephone set through an existing public cellular radio telephone system and a private radio telephone system disposed inside the cells of the public cellular radio telephone system, an antenna and a transceiver for |
| 4743874 |
Magnetostatic wave tunable resonator |
May 10, 1988 |
| A magnetostatic wave tunable resonator which has fine stripe electrodes and bonding electrode films formed on the surface of a YIG thin film supported by a GGG substrate. The stripe electrodes, bonding electrode films and edges of the YIG film are formed by a chemical etching method base |
| 4263571 |
Surface acoustic wave filter |
April 21, 1981 |
| A broad-band surface acoustic wave filter of turn reflector type in which the number N of thin film finger or stripe electrode pairs in at least one transducer is selected to satisfy N=F/k.sup.2 to obtain a flat selected band in the frequency response, where F is the constant determined |
| 4255726 |
Surface acoustic wave filter |
March 10, 1981 |
| A surface acoustic wave filter having transmitting and receiving transducers, coupling transducers, as well as reflecting transducers which are arrayed on a piezo-electric substrate. The coupling transducers are so designed as to function as 3-dB directional couplers in order to obtain |
