摘要:
Disclosed are a ferrite for high-frequency applications and a manufacturing method thereof. The ferrite comprises the elements Mg, Cu, Fe, and O, in which the elements have a composition ratio represented by the formula Mg1-xCuxFe2O4, wherein x has a value of 0.1 or less.
摘要:
Disclosed are a ferrite for high-frequency applications and a manufacturing method thereof. The ferrite comprises the elements Mg, Cu, Fe, and O, in which the elements have a composition ratio represented by the formula Mg1-xCuxFe2O4, wherein x has a value of 0.1 or less.
摘要:
The present invention relates to a resonance frequency variable type antenna which has as low operating frequency as mobile broadcasting service bands of T-DMB and DVB-H and a wide frequency bandwidth and can select and receive various channels using a loop antenna capable of varying a resonance frequency through a variable capacitor. Particularly, the resonance frequency variable antenna can be mounted in a limited space, use two different service bands (T-DMB and DVB-H) and independently operate for the two service bands to achieve high-quality mobile broadcasting services. Accordingly, various mobile broadcasting services can be provided using a single antenna and the product values and reliabilities of the resonance frequency variable type antenna of the invention and mobile terminals including the resonance frequency variable antenna of the invention can be improved.
摘要:
The present invention relates to A radio frequency (RF) switch and an apparatus including the RF switch. In an aspect of the present invention, an RF switch includes a transmission line having one end connected to an input terminal or an output terminal and the other end connected to a signal line and configured to transfer an RF signal, and a diode disposed between the input terminal and the transmission line or between the output terminal and the transmission line, the diode being configured to control whether or not to transmit the RF signal. In another aspect, an RF switch includes a transmission line having one end connected to an input terminal and the other end connected to an output terminal, and a diode disposed between the input terminal and the transmission line or between the output terminal and the transmission line, the diode being configured to control whether or not to transmit the RF signal. Here, a CRLH (Composite Right/Left-Handed) transmission line is employed as the transmission line.
摘要:
Disclosed herein is a method for producing a spinel ferrite which has a low permeability loss and a low dielectric loss so that the spinel ferrite can be widely used as a material for high-frequency (MHz) electronic components, and a spinel ferrite produced thereby. The method for producing the spinel ferrite comprises the steps of: providing nickel oxide, cobalt oxide, manganese oxide and iron oxide; wet-mixing the nickel oxide, the cobalt oxide, the manganese oxide and the iron oxide in methanol to obtain a mixture; collecting powder from the mixture and drying the collected powder; grinding the dried powder; and heat-treating the dried powder, thereby producing a nickel-manganese-cobalt spinel ferrite having a low permeability loss and a low dielectric loss. The nickel-manganese-cobalt spinel ferrite can be widely as a material for RF electronic components, and when it is applied to an antenna, it can reduce the length of the antenna and improve the bandwidth, efficiency and performance of the antenna.
摘要:
The invention provides an antenna that uses a complex structure in which a dielectric having a low dielectric constant and a magnetic substance having high magnetic permeability are arranged perpendicularly and periodically to improve the gain, efficiency, and bandwidth of the antenna while maintaining the miniaturization of the antenna which is an advantage of known antennas using a dielectric having a high dielectric constant. For this purpose, the provided antenna is characterized by including a substrate and a radiation patch formed on the substrate. The substrate is formed with a complex structure having a perpendicular period between the dielectric and the magnetic substance.
摘要:
The present invention relates to a transmission line in which a physical value of an inductive element can be changed in various ways while minimizing a size. The transmission line of the present invention includes a transmission unit, a ground unit and inductive elements. The inductive element connects the transmission unit and the ground unit, and has a predetermined pattern. The inductive element is provided between two surfaces of a substrate. According to the present invention, a physical value of the inductive element, in particular, an inductance value can be changed in various ways while not increasing an overall size. Accordingly, a transmission line can be designed freely according to its application.
摘要:
Disclosed herein is a dual-resonance broadband antenna, and more particularly, to such a dual-resonance broadband antenna in which dual resonance is caused to occur using an antenna consisting of a strip line, a microstrip line or the like having a meander pattern so as to receive a signal for a wireless communication service at a relatively low frequency band, particularly, a signal with a terrestrial digital multimedia broadcasting (T-DMB) service frequency band of 174-216 MHz among a very high frequency (VHF) band. Particularly, the dual-resonance broadband antenna of the present invention is remarkably red used in its size (length) as compared to a general helical antenna, a monopole antenna, a dipole antenna or the like while using a wireless communication service at a relatively low frequency band, thereby achieving miniaturization thereof. Further, it is possible to improve quality and reliability of the small-sized dual-resonance broadband antenna according to the present invention as well as enhance the qualities of a portable terminal and a transmission and reception device for wireless communication employing the antenna according to the present invention.
摘要:
The present invention provides an antistatic deposition method of a wireless terminal component, which comprises depositing tin (Sn) or a tin-aluminum (Sn—Al) alloy on a molded material for a wireless terminal component. Also, the present invention discloses an antistatic deposition method of a wireless terminal component, which comprises: depositing tin (Sn) or a tin-aluminum (Sn—Al) alloy on a molded material for a wireless terminal component; and depositing one or more materials selected from the group consisting of Si, SiO, Ti, TiO, Al O and a mixture thereof on the deposited tin (Sn) layer or the deposited tin-aluminum (Sn—Al) alloy layer. The antistatic deposition method of a wireless terminal component according to the present invention has advantageous effects in that it overcomes the problems of the prior art that generation of static electricity adversely affects the performance of the inner circuits of the wireless terminal in case where a metal such as nickel (Ni), chrome (Cr) or the like is deposited on a wireless terminal component so as to create a mirror effect, and in that it can maintain an mirror effect and the performance of radio frequencies, can prevent peel-off of a tin (Sn) or tin-aluminum (Sn—Al) alloy deposited on a molded material for a wireless terminal component, and can improve scratch resistance and impact resistance of the wireless terminal component.
摘要:
There is provided an antenna having a spiral-shaped loading formed on the ground plane, in which a resonant frequency is lowered as the reactance component of a CRLH-TL structure is adjusted.