Abstract: This invention relates to a push-pull transformer for use in a high frequency push-pull amplifier. This push-pull transformer has a coaxial line whose one end is connected to an input terminal, while the other end thereof is provided with an internal conductor and an outer conductor, the internal and outer conductors being grounded through stubs. A capacitor having a proper capacity is connected between the internal conductor and the outer conductor whereby the push-pull transformer can be properly actuated in a low frequency range other than the frequency used without any necessity to enlarge the size of the stubs.

Abstract: The applicator of this invention functions as an antenna of electromagnetic waves when used in hyperthermia. The casing of this applicator serves as waveguide.The applicator incorporates in its casing an electromagnetic lens. It is also provided with a cooling mechanism for cooling the body surface of the heated region at an opening of the casing. When electromagnetic waves which have been introduced from outside to the supply portion propagate in the human body from the opening of the casing, energy reflection is generated due to untuned impedance. In order to prevent this reflection, the applicator of this invention incorporates three stub tuners which can be adjusted from outside so as to reduce the loss of energy.The casing of the applicator of this invention is filled with fluid such as machine oil which has a small damping factor so as to reduce the loss of electromagnetic waves in the casing which occurs during its propagation. The three stub tuners are waterproofed at their movable portion.

Abstract: A very large proportion of electromagnetic waves are reflected by the surface of the human body. To cope with this phenonmenon, the applicator of the present invention incorporates an electromagnetic lens at an electromagnetic wave-radiating end portion thereof, thereby enabling electromagnetic waves propagated in the human body to be gradually focused into a portion of the body to be heated. An omnidirectional electromagnetic lens is employed.Affected parts located at different depths in the body are generally treated by different applicators. However, the applicator of the present invention is constructed so that the electromagnetic lens is replacable. In consequence, only one case for the applicator is required. This makes the use of the applicator easier.For the purpose of providing a small-sized electromagnetic lens and applicator, coolant is made to flow inside the electromagnetic lens.

Abstract: A slotted waveguide antenna assembly includes a slotted waveguide, a dielectric beam shaper and reflectors which are fixed and held by a holder member.The dielectric beam shaper is formed from a pair of dielectric plate members. The dielectric plate members are so arranged that they are slightly closer at the forward ends than the base ends, thus providing a nonparallel arrangement. The inclination of the dielectric plate members is selected within a range of 0.8.ltoreq.d/D<1 (D: a distance between the dielectric plate members at the base portions, d: a distance between the dielectric plate members at the forward portions).The dielectric plate members have a thickness which produces a phase difference, between electromagnetic waves reflected by inner surfaces of the respectivie dielectric plate members that are opposite each other.

Abstract: The present invention is applied to a slotted waveguide antenna assembly which comprises a slotted waveguide having a plurality of slots, a reflector having an aperture in front of the slotted waveguide and reflecting radiated electromagnetic wave for forming directive beam, and a mounting portion for mounting the antenna assembly onto a place where the antenna assembly is to be installed.In such an antenna assembly, a fixing member is provided on the reflector at a position spaced from the slotted waveguide. The fixing member extends between the opposite walls of the reflector and fixed thereto. The fixing member has an end which projects outwardly from the wall of the reflector to form the mounting portion. The fixing member is sufficiently thin as compared with the working wavelength.The slotted waveguide antenna assembly may have a dielectric wave-guiding arrangement.

Abstract: A heating apparatus for hyperthermia utilizes electromagnetic waves for locally heating cancerous cells within a living body. When it is necessary for a plurality of patients to be subjected to hyperthermia treatment at the same time and in parallel with each other, the control of a plurality of electromagnetic wave outputs and the control of cooling of the surface of a heated region are effected by a centralized control which employs time-division multiplexing. Thus, it is advantageously possible to efficiently carry out a hyperthermia treatment which is fitting for the condition of each of a plurality of patients.

Abstract: A heating apparatus for hyperthermia utilizes electromagnetic waves for locally heating cancerous cells within a living body. Electromagnetic waves output from a single electromagnetic wave generating means are branched into a plurality of branched electromagnetic waves, which are respectively employed to conduct hyperthermia treatments for a plurality of patients. The whole of the hyperthermia system is controlled in a concentrated fashion from a single section by means of time-division multiplexing. It is therefore possible for a plurality of patients to be subjected to hyperthermia treatment at the same time and in parallel with each other, even when the conditions of these patients differ from one another. Further, it is advantageously possible to simplify the arrangement of the system as a whole and stabilize the control of the system.

Abstract: A heating apparatus for hyperthermia utilizes electromagnetic waves for locally heating cancerous cells within a living body. Electromagnetic waves output from a single electromagnetic wave generating device are branched into a plurality of electromagnetic wave outputs, which are respective employed to conduct hyperthermia treatments for a plurality of patients, the level of each of the branched outputs being adjustable. The whole of the hyperthermia system is controlled in a concentrated fashion from a single section by way of time-division multiplexing. It is therefore possible for a plurality of patients to be subjected to hyperthermia treatment at the same time and in parallel with each other, even when the conditions of these patients differ from one another. Further, it is advantageously possible to simplify the arrangement of the system as a whole and provide an even more precise control of the system.

Abstract: Coolant liquid is caused to flow through a lens section of an applicator to control the heating of the applicator due to a loss in propagation of the electromagnetic waves in the applicator. Furthermore, in this applicator, device for decreasing the internal loss, device for improving a lens effect to efficiently heat a predetermined portion in a living body, and the like are provided, respectively, as necessary.

Abstract: Described is an antenna structure which reduces the side lobe level of a slot array antenna of the type using a dielectric plate as a director mechanism. A slot radiator is mounted on the vertical side of a member composed of metal plates and having a C-shaped side sectional shape, and a pair of parallel dielectric plates are projected to extend in the direction of the open end of the C-shaped member. Also, a pair of metal pent roof plates are provided to spread upwardly and downwardly from the open end edges of the C-shaped member on the outer side of the dielectric plates. The metal pent roof plates serve as reflecting plates for the radiation power from the slot radiator and thus the side lobe level is reduced to a practical low level.