Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Distributed parameter resonator-type magnetron
Reexamination Certificate
2003-03-21
2004-10-12
Alemu, Ephrem (Department: 2821)
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Distributed parameter resonator-type magnetron
C315S005130, C333S182000
Reexamination Certificate
active
06803726
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
This application claims the benefit of Korean Application No. 2002-62295, filed Oct. 12, 2002, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a high frequency generator and, more particularly, to a noise filter of a high frequency generator.
2. Description of the Related Art
A high frequency generator, such as a magnetron, a klystron, a traveling wave tube and a semiconductor device, is applied in various fields. The high frequency generator mainly employs a noise filter to prevent undesired leakage of high frequency energy. The leakage of high frequency energy causes noise in electronic devices, such as a television and the like. For this reason, it is important to prevent leakage of high frequency energy from the high frequency generator. Generally, a noise filter includes inductive devices, such as choke coils, a capacitor, a shielding casing and the like, and are connected to an electric conductor to supply power.
FIGS. 1A and 1B
are partially sectional and top views of a conventional noise filter of a high frequency generator, respectively.
FIGS. 1A and 1B
are also shown in Korean Non-examined Patent Publication No. 10-1999-0072650. As shown in
FIGS. 1A and 1B
, a noise filter
120
is disposed under a magnetron
100
. Inside a filter casing
144
of the noise filter
120
, choke coils
154
, each including a core inductor
150
and an air-core inductor
152
connected in series to each other, are disposed. The core inductors
150
have high frequency-energy absorbing members
148
inserted thereinto, while the air-core inductors
152
do not have the high frequency-energy absorbing members
148
therein. The core inductors
150
are connected to a condenser
158
. The air-core inductors
152
are connected to a stem
156
through stem terminals
156
a
and
156
b.
Generally, a core inductor may reduce noise of a frequency band below 400 MHz by regulating a number of coil windings thereof. An air-core inductor may reduce noise of a frequency band ranging from 700 MHz to 1000 MHz by regulating a number of coil windings thereof. In the conventional noise filter shown in
FIGS. 1A and 1B
, the core inductors
150
and the air-core inductors
152
are connected in series to each other, and sectional areas of the high frequency-energy absorbing members
148
are sized, so noise of a frequency band ranging from 400 MHz to 700 MHz is reduced.
However, although a noise frequency band causing many communication obstacles ranges from 400 MHz to 900 MHz, the conventional noise filter may not reduce noise of a frequency band ranging from 400 MHz to 900 MHz using the core inductors
150
, the air-core inductors
152
, or a structure in which the core inductor
150
and the air-core inductor
152
are connected in series to each other.
SUMMARY OF THE INVENTION
Accordingly, it is an aspect of the present invention to provide a noise filter of a high frequency generator, which may reduce noise of a certain frequency band leaked from the high frequency generator using a structure in which a core inductor, an air-core inductor and another core inductor are connected in series to each other.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
The foregoing and/or other aspects of the present invention are achieved by providing a noise filter of a high frequency generator having a structure in which a first core inductor, an air-core inductor and a second core inductor are connected in series to each other. The first and second core inductors have high frequency-energy absorbing members inserted thereinto, and the air-core inductor is not provided with a high frequency-energy absorbing member.
According to an aspect of the invention, the high frequency-energy absorbing member is made of one of iron oxide, tin alloy and ferrite.
According to another aspect of the invention, the high frequency-energy absorbing member is provided with a sectional area in which noise of a frequency band ranging from 400 MHZ to 900 MHz is attenuated.
REFERENCES:
patent: 3922612 (1975-11-01), Tashiro
patent: 4131824 (1978-12-01), Nakai et al.
patent: 4720658 (1988-01-01), Tsuzurahara
patent: 5432405 (1995-07-01), Ochiai et al.
patent: 10-241586 (1998-09-01), None
patent: 1999-72650 (1999-09-01), None
Alemu Ephrem
Samsung Electronics Co,. Ltd.
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