摘要:
A detector used in radio devices typically mobile communications equipment. A small detector detects frequencies in two predetermined bands separately with respective predetermined coupling. The detector comprises a first transmission line (1), and second and third transmission lines (2) and (3) disposed near the first transmission line (1). One end of the first transmission line (1) is connected to a terminating resistor (4), and the other end of the first transmission line (1) is connected to an anode terminal of a detecting diode (6) through a wideband matching circuit (5). A cathode terminal of the detecting diode (6) is connected to a load circuit (7).
摘要:
A two-frequency switch which is used for mobile radio communication of portable telephone, etc., and can be switched to turned-on/off states in two channels with a simple constitution. The two-frequency switch is composed of a parallel connected body of a PIN diode (101) and its compensation circuit (102) which is constituted of a circuit having at least two series resonance points and one parallel resonance point. Therefore, the impedance of the compensation circuit which is capacitive at a frequency as low as a direct current becomes inductive after passing through the first series resonance point and cancels the parasitic capacitance of the diode (101) in the first channel. In addition, the impedance again can become inductive after passing through the next series resonance point from the parallel resonance point and cancel the parasitic capacitance of the PIN diode (101) in the second channel.
摘要:
The present invention relates to a hybrid radio frequency (RF) switching device. It is an object of the invention to provide a hybrid RF switching device including fewer diodes and having a smaller size and high performance. To achieve the object according to the invention, the device includes first to fourth ports, a diode coupled between the first port and second port, a first transmission line having an electrical length of λg/4 (where λg is a wavelength of a frequency in a first frequency band), and a first element coupled in series with the first transmission line having an almost simple reactance component and nearly opening in a second frequency band. The first transmission line and first element are coupled in series between the second port and third port. The device further includes a second transmission line having an electrical length of λd/4 (where λd is a wavelength of a frequency in the second frequency band), and a second element having an almost simple reactance component and nearly opening in the first frequency band. The second transmission line and second element are coupled in series between the second port and fourth port.
摘要:
A high frequency switch used for a mobile communication apparatus, such as, a portable telephone or the like is provided. The dual band switch may be in an ON or an OFF state in two bands. The dual band switch may comprise a series circuit including a PIN diode and a compensation circuit. The compensation circuit may be formed having at least two series resonance points and one parallel resonance point. The circuit arrangement allows the impedance of the compensation circuit, which is capacitive at low frequency close to a direct current, to become inductive after a first series resonance point, so that a parasitic capacitance of the diode may be canceled in a first band. The impedance of the compensation circuit may also become inductive after a parallel resonance point and the following series resonance point, so that a parasitic capacity of the PIN diode may be canceled in a second band.
摘要:
A filter used for radio communication equipment, whose characteristics are not deteriorated because the no-load Q of the strip line resonator is high. The filter comprises a base (4) having first and second electromagnetically-coupled strip lines (5) and (6) on the front side, and an earth pattern (2) on the reverse side, a dielectric layer (8) stacked on the front side of the base (4), and provided with capacitor patterns (9) and (10) on the front side facing the aforesaid first and second strip lines (5) and (6) with the dielectric layer (8) therebetween; and a metal cap (1) covering the dielectric layer (8). A conduction film which is connected to the earth pattern (2) on the reverse side is provided on a part of the edge of the base (4). At least a part of the outer periphery of the metal cap (1) extends to this conduction film and is connected to it.
摘要:
A filter used for radio communication equipment, whose characteristics are not deteriorated because the no-load Q of the strip line resonator is high. The filter comprises a base (4) having first and second electromagnetically-coupled strip lines (5) and (6) on the front side, and an earth pattern (2) on the reverse side, a dielectric layer (8) stacked on the front side of the base (4), and provided with capacitor patterns (9) and (10) on the front side facing the aforesaid first and second strip lines (5) and (6) with the dielectric layer (8) therebetween; and a metal cap (1) covering the dielectric layer (8). A conduction film which is connected to the earth pattern (2) on the reverse side is provided on a part of the edge of the base (4). At least a part of the outer periphery of the metal cap (1) extends to this conduction film and is connected to it.
摘要:
An antenna comprising a magnetic body (31) disposed in the vicinity of an earth lead wire (28), wherein a space for a nonmagnetic body is provided between a discharge electrode (27) and an earth electrode (26).
摘要:
A small high-performance high-frequency composite switch component having a reduced number of diodes. The switch component has first to forth ports. A diode is connected between the first and second ports. A first transmission line of μg/4 (μg is the wavelength of the frequency in a first frequency band) and a substantially open first element which is a substantially simple reactance component in a second frequency band are connected in series between the second and third ports. A second transmission line of μd/4 (μd is the wavelength of the frequency in the second frequency band) and a substantially open second element which is a substantially simple reactance component in the first frequency band are connected in series between the second and third ports.
摘要:
An antenna of the present invention is provided with a magnetic material (31) in the vicinity of a grounding lead wire (28) and with a nonmagnetic space between a radiation electrode (27) and a ground electrode (26).