Abstract: An embodiment is a radio wave lens including a plurality of unit cells two-dimensionally arranged on a surface of a substrate intersecting an incident radio wave. Each of the unit cells includes a dielectric layer whose dielectric constant is externally controllable, dielectric layers formed so as to sandwich the dielectric layer therebetween, a conductor layer formed on a surface of the dielectric layer in a side of the dielectric layer so as to be in contact with the dielectric layer, and a conductor layer formed on a surface of the dielectric layer in a side of the dielectric layer so as to be in contact with the dielectric layer.

Abstract: In a radio wave lens, unit cells are two-dimensionally disposed on a plane of a substrate intersecting an incident radio wave. In the unit cells, a conductor portion bent in a crank shape in a plane of the substrate is formed, or a conductor-removed region bent in a crank shape in the plane of the substrate is formed in a conductor layer on the substrate. The unit cells in which the bending directions of the conductor portions or the bending directions of the conductor-removed regions are different from each other are two-dimensionally disposed according to a desired phase distribution of the radio wave transmitted through the unit cells.

Abstract: An embodiment is a slot-coupling type coupler for connecting a high-frequency circuit to a waveguide tube. The coupler includes a substrate, at least a part of the substrate being inserted into the waveguide tube, and a conductor patch on the substrate and configured to emit a high-frequency wave generated by the high-frequency circuit into the waveguide tube. The conductor patch comprises a first conductor patch on a first side of the substrate and includes a complementary metamaterial cell including one or more conductor portions forming one or more gaps.

Abstract: A mixer includes a transistor to which an IF signal of ae positive phase side is input, a transistor to which an IF signal of a negative phase side is input, a transistor to which an LO signal is input, and a synthesizer which synthesizes components of a RF frequency band output from the drain terminals of the transistors in a negative phase, and synthesizes components of an IF frequency band output from the drain terminals of the transistors in the same phase.

Abstract: An embodiment is a beamformer for directing an incident electromagnetic wave, including a first conductive metamaterial cell configured to shift a phase of a first portion of the electromagnetic wave, a second conductive metamaterial cell located adjacent to the first conductive metamaterial cell, having a different geometry than the first conductive metamaterial cell, and configured to shift a phase of a second portion of the electromagnetic wave, a conductor including at least a portion disposed between the first conductive metamaterial cell and the second conductive metamaterial cell.

Abstract: The mixer circuit includes a mixer, an LO matching circuit inserted between an LO signal terminal and a first terminal of the mixer, an IF matching circuit inserted between the IF signal terminal and a second terminal of the mixer, and an RF matching circuit inserted between an RF signal terminal and a third terminal of the mixer. In the RF matching circuit, a reflection characteristic is set such that a minimum value of reflection loss appears on a high-frequency side of the frequency of the LO signal.

Abstract: A split ring resonator (10) as a unit cell of a passive element includes a conductor (1) made of a metal and having an annular shape split by a first gap (2) and a second gap (3) different from the first gap (2). A first capacitance generated by the first gap (2) is different from a second capacitance generated by the second gap (3).

Abstract: A split ring resonator (10) as a unit cell of a passive element includes a conductor (1) made of a metal and having an annular shape split by a first gap (2) and a second gap (3) different from the first gap (2). A first capacitance generated by the first gap (2) is different from a second capacitance generated by the second gap (3).

Abstract: A pair of access control circuits having bit line pairs wired corresponds to a same data terminal and is assigned different addresses. During a test mode, a data swap circuit prohibits swapping of connections between a pair of data terminals and a pair of data lines when one of the access control circuits is used, and swaps the connections between a pair of data terminals and a pair of data lines when the other one of the access control circuits is used. Accordingly, it is possible to give a data signal at the same logic level to bit lines with different logics from each other. Stress can be given between a contact arranged between a pair of the access control circuits and bit lines adjacent to both sides of the contact. Consequently, designing of a test pattern can be simplified, and test efficiency can be improved.

Abstract: A semiconductor memory device includes a memory cell array, a redundant element, an address specifying circuit configured to select one of a plurality of addresses as a redundancy address in response to a switchover signal, a decoder circuit configured to select the redundant element in response to an externally applied address that matches the redundancy address selected by the address specifying circuit, and a test mode setting circuit configured to change the switchover signal in response to an externally applied input, thereby to cause the redundancy address assigned to the redundant element to be switched between different ones of the plurality of addresses.

Abstract: A pair of access control circuits having bit line pairs wired corresponds to a same data terminal and is assigned different addresses. During a test mode, a data swap circuit prohibits swapping of connections between a pair of data terminals and a pair of data lines when one of the access control circuits is used, and swaps the connections between a pair of data terminals and a pair of data lines when the other one of the access control circuits is used. Accordingly, it is possible to give a data signal at the same logic level to bit lines with different logics from each other. Stress can be given between a contact arranged between a pair of the access control circuits and bit lines adjacent to both sides of the contact. Consequently, designing of a test pattern can be simplified, and test efficiency can be improved.

Abstract: A semiconductor memory device includes a memory cell array, a redundant element, an address specifying circuit configured to select one of a plurality of addresses as a redundancy address in response to a switchover signal, a decoder circuit configured to select the redundant element in response to an externally applied address that matches the redundancy address selected by the address specifying circuit, and a test mode setting circuit configured to change the switchover signal in response to an externally applied input, thereby to cause the redundancy address assigned to the redundant element to be switched between different ones of the plurality of addresses.

Abstract: Here is described a portable chiller with which an ophthalmic solution, cosmetic preparation, beverage or the like in a small container can be conveniently chilled. This portable chiller consists generally of a cylinder filled with a liquefied refrigerant gas and a chiller case. This chiller case includes a cylinderloading compartment, a cooling compartment in which the article is chilled, and a refrigerant ejection device for ejecting the refrigerant from the cylinder accommodated in the cylinder compartment into the cooling compartment.

Abstract: Here is described a portable chiller with which an ophthalmic solution, cosmetic preparation, beverage or the like in a small container can be conveniently chilled. This portable chiller consists generally of a cylinder filled with a liquefied refrigerant gas and a chiller case. This chiller case includes a cylinderloading compartment, a cooling compartment in which the article is chilled, and a refrigerant ejection device for ejecting the refrigerant from the cylinder accommodated in the cylinder compartment into the cooling compartment.