摘要:
A nonradiative dielectric waveguide filter of the present invention permits the manufacturing process including the production of a dielectric strip to be simpler. The filter can be formed by a pillar dielectric strip. The nonradiative dielectric waveguide filter includes resonators, input-output connection units, and cut-off regions, in which the upper and lower conductor plates and a dielectric strip disposed therebetween form the filter. In one example, the main signal-transmitting mode is the LSM mode; a groove having a bottom and conductor walls is disposed in a position in which the conductor plates are opposing; the resonator is formed by fitting the dielectric strip into the groove; and the cut-off regions are formed by second grooves formed in the conductor plates adjacent to the dielectric strip.
摘要:
An object of the present invention is to provide an NRD guide which can be used in a wide band in a state where output levels of distributed high-frequency signals are nearly equal and does not require precise positioning, thereby enhancing mass productivity thereof. The NRD guide comprises a first straight dielectric strip made of cordierite ceramics having a dielectric constant of 4.8 and a dielectric loss of 2.7×10−4 (at a measurement frequency of 77 GHz) and having a section of 1.0 mm width×2.25 mm height, and a second dielectric strip joined to the first dielectric strip at a midway position thereof so as to be branched along an arc and bent at an angle of 90°, wherein the first and second dielectric strips are integrally produced, and the radius of curvature r of a junction (branched portion) of the second dielectric strip is 12.7 mm, which is larger than the wavelength &lgr;≈5 mm of high-frequency signals of 60 GHz.
摘要:
In a transmission line, protrusions extend in line one after another in a direction perpendicular to the cross section in a part of a dielectric substrate, with a discontinuous portion therebetween. A lower-surface electrode is formed on a main surface of the dielectric substrate provided with the protrusions and on the outer surfaces of the protrusions. An upper-surface electrode is formed on substantially the whole area of the surface opposite to the lower-surface electrode. Further, a plurality of through-holes for connecting the lower-surface electrode and the upper-surface electrode, which are formed on both surfaces of the dielectric substrate, are aligned on both sides of the protrusions along the direction in which the protrusions extend. Also, coplanar lines and a circuit element are mounted on the upper-surface electrode. The coplanar lines are coupled at a predetermined position to a transmission path formed by the protrusions.
摘要:
An electromagnetic wave propagation structure, suitable for the transmission of an electromagnetic wave and the formation of resonators within filters, is constructed of both high and low dielectric-constant materials wherein the high dielectric-constant is in excess of approximately 80 and the low dielectric-constant is less than approximately 2. A boundary between the high and the low dielectric-constant materials serves as an electric wall to waves propagating in the low dielectric-constant material and as a magnetic wall to waves propagating in the high dielectric-constant material. This permits substitution of the high dielectric-constant material for metal elements, such as resonators and feed structures in filters. Furthermore, the use of a cladding of dielectric material of one of the foregoing dielectric ranges about a core of material of the other of the foregoing dielectric ranges enables construction of waveguides having rectangular and circular cross-sections. Microstrip and stripline structures with substitution of the high dielectric-constant material for the harmonic elements may also be constructed.
摘要:
A dielectric strip is located in a space formed by facing grooves in two conductors. A corner of the groove bottom surface Gb has a sectionally substantial arc form. A groove side surface Gs is tapered such that a gap can be provided between the groove side surface Gs and the side surface of the dielectric strip.
摘要:
A single-wire time-domain reflectometer (TDR) combines the best performance features of prior art “electronic dipsticks” in a high accuracy implementation that allows tank penetration though a small opening. A wire-horn structure is employed to launch TDR pulses onto a single wire transmission line, wherein the horn wires can be flexed inwards so the dipstick structure can be inserted through a small tank opening. Once inside the tank, the horn wires flex to their normal state to provide a controlled reference reflection while simultaneously providing high coupling efficiency to the dipstick. The TDR system determines the fill-level of a tank by measuring the time difference between a reflection created at the wire-horn, which all is at the top of a tank, and a reflection from a material in the tank. The TDR employs automatic time-of-peak (TOP) detectors and incorporates a 2-diode sampler, a low-aberration pulse generator, and a 0.001% accurate timebase.
摘要:
It is possible to generate a resonance mode such that a dielectric resonator (20) can be resonated and an electric field vector leaking out from the resonator (20) exists by arranging antennas (22a and 22b) for the resonator (20). When a sample (22) has dielectric anisotropy, the resonance frequency of the resonator (20) varies when the sample (25) or resonator (20) is rotated. The dielectric anisotropy of the sample (25) is found from the variance of the resonance frequency. Thus the dielectric anisotropy of not only a sheet-like sample, but also such a sample as a three-dimensional molded sample can be measured.
摘要:
A dielectric waveguide designed to avoid the influence of reflection of electromagnetic waves at connected portions of dielectric strips and to have an improved characteristic. The distance L between connection planes between pairs of dielectric strips adjacent in the direction of propagation of an electromagnetic wave is set to an odd number multiple of ¼ of the guide wavelength. Reflected waves are thereby superposed in phase opposition to each other to cancel out. In this manner, propagation of a reflected signal to ports is limited.
摘要:
An object of the present invention is to provide an NRD guide which can be used in a wide band in a state where output levels of distributed high-frequency signals are nearly equal and does not require precise positioning, thereby enhancing mass productivity thereof. The NRD guide comprises a first straight dielectric strip made of cordierite ceramics having a dielectric constant of 4.8 and a dielectric loss of 2.7×10−4 (at a measurement frequency of 77 GHz) and having a section of 1.0 mm width×2.25 mm height, and a second dielectric strip joined to the first dielectric strip at a midway position thereof so as to be branched along an arc and bent at an angle of 90°, wherein the first and second dielectric strips are integrally produced, and the radius of curvature r of a junction (branched portion) of the second dielectric strip is 12.7 mm, which is larger than the wavelength &lgr;≈5 mm of high-frequency signals of 60 GHz.
摘要:
A dielectric waveguide designed to avoid the influence of reflection of electromagnetic waves at connected portions of dielectric strips and to have an improved characteristic. A third dielectric strip is inserted in a part of a connection section at which a first dielectric strip and a second dielectric strip are connected to each other, and the distances between the three connection planes in said connection section are determined so that a wave reflected at the connection plane between the first and third dielectric strips, a wave reflected at the connection plane between the first and second dielectric strips, and a wave reflected at the connection plane between the second and third dielectric strips are superposed with a phase difference of 2&pgr;/3 from each other. Alternatively or in addition, the distance between the first-second dielectric strip connection plane and the first-third dielectric strip connection plane is set to ⅙ of the guide wavelength of an electromagnetic wave propagating through the dielectric strips, and the distance between the first-second dielectric strip connection plane and the second-third dielectric strip connection plane is set to ⅙ of the guide wavelength. Reflected waves are thereby superposed in phase opposition to each other to cancel out. In this manner, propagation of a reflected signal to ports is limited.