WO1990001814A1 - Active antenna - Google Patents
Active antenna Download PDFInfo
- Publication number
- WO1990001814A1 WO1990001814A1 PCT/JP1989/000806 JP8900806W WO9001814A1 WO 1990001814 A1 WO1990001814 A1 WO 1990001814A1 JP 8900806 W JP8900806 W JP 8900806W WO 9001814 A1 WO9001814 A1 WO 9001814A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- active antenna
- wavelength
- amplifier
- constant element
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
Definitions
- This invention applies to active antennas, especially from VLF band near DC to SHF for satellite broadcasting and satellite communication (FM, TV, radio, amateur radio, ship / aircraft radio, mobile radio for automobiles, etc., 83-3).
- active antennas especially from VLF band near DC to SHF for satellite broadcasting and satellite communication (FM, TV, radio, amateur radio, ship / aircraft radio, mobile radio for automobiles, etc., 83-3).
- FM, TV, radio, amateur radio, ship / aircraft radio, mobile radio for automobiles, etc., 83-3 A small, ultra-sensitive antenna that can be used in a wide range of applications
- each of these receiving antennas has an operating impedance of R. And therefore this R. Characteristic impedance equal to R. Is connected and the received radio wave is guided to the receiver.
- An object of the present invention is to provide a small-sized and relatively wide-band active antenna capable of receiving even a slightly weaker radio wave in principle except for the limit of the minimum reception electric field strength. Disclosure of the invention
- the active antenna according to the present invention has a lumped constant element forming a radio wave receiving section and an input terminal connected to both ends of the lumped constant element directly or via a lead that is extremely short with respect to the wavelength of the reception frequency.
- the output terminal is configured with a high input impedance amplifier connected to the receiver. This enables a small, ultra-sensitive activator You can get tena. That is, if the active antenna of the present invention was used, for example, in the building of Akasaka, Minato-ku, Tokyo with the amplifier gain of 20 dB, the FM Yokohama station FM could be satisfactorily received. It was not possible to receive signals using a sensitivity tuner and a 1 m dipole antenna. Similarly, with the active antenna of the present invention, the Tama TV station's television could be received within the same pill, but it could not be received by a UHF receiving antenna with 32 elements and a gain of 16 dB.
- the active antenna of the present invention when receiving a radio wave, no reception current is applied to the antenna element, so that secondary radiation is not obstructed. That is, in the conventional antenna, a current flows through the antenna element to cause energy loss of radio waves in space, and thus radio waves in the adjacent room are eliminated.Therefore, there is a possibility that the reception of radio waves by the antenna in the adjacent room may become impossible. According to the active antenna of the present invention, since no current flows through the antenna element and radio waves are not drawn into the receiver from the space, there is no possibility that reception of an antenna in an adjacent room becomes impossible.
- a parabolic antenna is not required even for BS reception or the like, and a large-diameter parabolic antenna can be replaced with this by developing a high-amplification amplifier with good noise figure.
- a parabolic antenna is attached to the active antenna of the present invention, the sensitivity becomes higher and a smaller aperture is required.
- the active antenna of the present invention has a relatively wide band. That is, with the conventional antenna, multi-ghosting is caused by the reflection of a building or the like during TV reception, which makes the city difficult to see.
- the indoor antenna has a diameter of 2 O It turned out that there are many spots without goss in the spherical space of cm. That is, it is possible to solve the problem of difficulty in TV reception, which is impossible with a conventional TV antenna.
- Fig. 1 is an explanatory diagram of the active antenna of the present invention
- Figs. 2 and 3 are circuit diagrams of the amplifier
- Fig. 4 is an explanatory diagram of another embodiment of the amplifier
- the real part of the impedance of the lumped element element of the antenna system excluding the amplifier is zero and no thermal noise source exists.
- the thermal noise due to the input impedance of the amplifier is short-circuited by the capacitance in the high-frequency region and by the inductance in the low-frequency region, and does not appear in the output. That is, radio waves can be received in a state where the thermal noise of the antenna system is reduced to zero, and any amount of weak radio waves can be received by increasing the amplification degree of the amplifier.
- a linear conductor can also be considered.
- a linear conductor antenna element 1 having a length sufficiently shorter than the wavelength of the reception frequency, for example, a length of several cm, is used as a lumped constant element.
- the input terminal 3a, 3b of the high input impedance amplifier 3 is connected to the input terminal 3a, 3b of the high input impedance amplifier 3 directly or via the lead 2 of a very short length for the wavelength of the receiving frequency. (Not shown).
- the active antenna of the present invention has the above-described configuration, the resistance generated in the short antenna element 1 and the short lead 2 is almost zero, that is, the thermal noise is extremely small, and therefore the extremely weak radio wave Can be received without being buried in noise.
- FIG. 2 is a circuit diagram of an amplifier considered as a high input impedance amplifier 3 used in the active antenna of the present invention
- FIG. The transistor 6 is a coaxial cable.
- the jacket of the coaxial cable 6 is connected to one end of the antenna element 1 via one of the ground and the input terminal 3a, thereby forming a dipole antenna.
- there are inconveniences such as a change in the state of radio wave reception by the antenna.
- a differential amplifier using two transistors 5a and 5b as shown in FIG. 3 can be considered.
- 7 is a constant current source.
- the earth line of the amplifier and the jacket of the coaxial cable are completely separated from the antenna element, so that it is possible to prevent the antenna from becoming a dipole antenna as described above.
- FIG. 4 shows an example in which a shield plate 8 cuts off between the antenna element 1 and the amplifier 3 in FIG. 2.
- the equivalent circuit is shown in FIG. 5 due to the Miller effect of the shield plate. As a result, the same effect as in the example of FIG. 3 can be obtained.
- FIG. 6 shows an example in which the active antenna of the present invention is disposed at one end of a radio wave absorber having a length of several meters, for example, a ferrite cylinder 9 and a radio wave is guided from the other end. If so, its directivity can be significantly improved.
- FIG. 7 shows, as an antenna element 1 in the active antenna of the present invention, for example, a capacitor formed by arranging two 8 cm square conductor plates 1 a and 1 b at a distance of 1 O cm from each other.
- a linear conductor may be wound into a coil having a diameter and length of several cm by winding it 10 times, for example, as shown in FIG. 8, and as shown in FIG.
- a capacitor in which a capacitor and a coil are connected in series may be used.
- the active antenna according to the present invention is particularly suitable for the SLF (FM, TV, radio, amateur radio, marine and aircraft radio, mobile radio such as automobile, BS It is suitable for use as a small, relatively wide-band, ultra-high-sensitivity active antenna that can be applied to a wide range of applications up to CS and CS) and can receive even the weakest radio waves in principle.
- SLF FM, TV, radio, amateur radio, marine and aircraft radio, mobile radio such as automobile, BS
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9007798A GB2231204A (en) | 1988-08-12 | 1990-04-06 | Active antenna |
KR1019900700753A KR900702595A (ko) | 1988-08-12 | 1990-04-11 | 능동 안테나 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63200211A JPH0250604A (ja) | 1988-08-12 | 1988-08-12 | アクティブアンテナ |
JP63/200211 | 1988-08-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990001814A1 true WO1990001814A1 (en) | 1990-02-22 |
Family
ID=16420662
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1989/000806 WO1990001814A1 (en) | 1988-08-12 | 1989-08-07 | Active antenna |
Country Status (7)
Country | Link |
---|---|
US (1) | US5172126A (ja) |
EP (1) | EP0386255A4 (ja) |
JP (1) | JPH0250604A (ja) |
KR (1) | KR900702595A (ja) |
AU (1) | AU624174B2 (ja) |
GB (1) | GB2231204A (ja) |
WO (1) | WO1990001814A1 (ja) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9114720D0 (en) * | 1991-07-08 | 1991-08-28 | Electronic Advanced Research L | Radio receiving circuits |
EP0523271B1 (en) * | 1991-07-18 | 1997-03-12 | Texas Instruments Deutschland Gmbh | Circuit arrangement for antenna coupling |
GB2306056B (en) * | 1995-10-06 | 1999-12-08 | Nokia Mobile Phones Ltd | Antenna |
US6433835B1 (en) | 1998-04-17 | 2002-08-13 | Encamera Sciences Corporation | Expanded information capacity for existing communication transmission systems |
US7180942B2 (en) | 2001-12-18 | 2007-02-20 | Dotcast, Inc. | Joint adaptive optimization of soft decision device and feedback equalizer |
US6917336B2 (en) * | 2002-01-23 | 2005-07-12 | Dotcast, Inc. | Miniature ultra-wideband active receiving antenna |
WO2004075469A2 (en) | 2003-02-19 | 2004-09-02 | Dotcast Inc. | Joint, adaptive control of equalization, synchronization, and gain in a digital communications receiver |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS548061B1 (ja) * | 1970-07-25 | 1979-04-12 | ||
JPS57207404A (en) * | 1981-06-15 | 1982-12-20 | Sumitomo Electric Ind Ltd | Active antenna using differential amplifier |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB834465A (en) * | 1957-03-18 | 1960-05-11 | Nat Res Dev | Improvements in or relating to microwave modulators |
US3386033A (en) * | 1965-02-11 | 1968-05-28 | Univ Ohio State Res Found | Amplifier using antenna as a circuit element |
US3622890A (en) * | 1968-01-31 | 1971-11-23 | Matsushita Electric Ind Co Ltd | Folded integrated antenna and amplifier |
AU418988B2 (en) * | 1968-05-20 | 1971-11-17 | Improved transistorised antenna | |
US3714659A (en) * | 1968-12-10 | 1973-01-30 | C Firman | Very low frequency subminiature active antenna |
US3703685A (en) * | 1969-09-10 | 1972-11-21 | Labtron Corp Of America | Multiband antenna with associated r.f. amplifier |
US3827053A (en) * | 1970-07-23 | 1974-07-30 | E Willie | Antenna with large capacitive termination and low noise input circuit |
DE2115657C3 (de) * | 1971-03-31 | 1983-12-22 | Flachenecker, Gerhard, Prof. Dr.-Ing., 8012 Ottobrunn | Aktive Unipol-Empfangsantenne |
US3774218A (en) * | 1972-01-18 | 1973-11-20 | C Fowler | Coaxial cable loop antenna with unidirectional current amplifier opposite the output |
US4115778A (en) * | 1976-11-18 | 1978-09-19 | Jfd Electronics Corporation | Electronic solid state FM dipole antenna |
NL182109C (nl) * | 1980-06-20 | 1988-01-04 | Philips Nv | Actieve antenne. |
JPS57188143A (en) * | 1981-05-14 | 1982-11-19 | Sony Corp | Antenna device |
US5019830A (en) * | 1989-03-13 | 1991-05-28 | Harada Kogyo Kabushiki Kaisha | Amplified FM antenna with parallel radiator and ground plane |
-
1988
- 1988-08-12 JP JP63200211A patent/JPH0250604A/ja active Pending
-
1989
- 1989-08-07 AU AU40435/89A patent/AU624174B2/en not_active Ceased
- 1989-08-07 US US07/477,868 patent/US5172126A/en not_active Expired - Fee Related
- 1989-08-07 WO PCT/JP1989/000806 patent/WO1990001814A1/ja not_active Application Discontinuation
- 1989-08-07 EP EP19890909039 patent/EP0386255A4/en not_active Withdrawn
-
1990
- 1990-04-06 GB GB9007798A patent/GB2231204A/en not_active Withdrawn
- 1990-04-11 KR KR1019900700753A patent/KR900702595A/ko not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS548061B1 (ja) * | 1970-07-25 | 1979-04-12 | ||
JPS57207404A (en) * | 1981-06-15 | 1982-12-20 | Sumitomo Electric Ind Ltd | Active antenna using differential amplifier |
Non-Patent Citations (1)
Title |
---|
See also references of EP0386255A4 * |
Also Published As
Publication number | Publication date |
---|---|
US5172126A (en) | 1992-12-15 |
JPH0250604A (ja) | 1990-02-20 |
KR900702595A (ko) | 1990-12-07 |
EP0386255A4 (en) | 1991-03-13 |
EP0386255A1 (en) | 1990-09-12 |
AU624174B2 (en) | 1992-06-04 |
AU4043589A (en) | 1990-03-05 |
GB2231204A (en) | 1990-11-07 |
GB9007798D0 (en) | 1990-08-01 |
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