JPH0412045B2 - - Google Patents
Info
- Publication number
- JPH0412045B2 JPH0412045B2 JP58141629A JP14162983A JPH0412045B2 JP H0412045 B2 JPH0412045 B2 JP H0412045B2 JP 58141629 A JP58141629 A JP 58141629A JP 14162983 A JP14162983 A JP 14162983A JP H0412045 B2 JPH0412045 B2 JP H0412045B2
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- hula hoop
- ground plane
- band
- vehicle body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000002131 composite material Substances 0.000 claims description 7
- 239000004020 conductor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Details Of Aerials (AREA)
Description
【発明の詳細な説明】
本発明は、フラフープアンテナを用いた多チヤ
ネルの複合アンテナに関し、特にＫHz帯のAM放
送も受信できるようにしたものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-channel composite antenna using a hula hoop antenna, which is particularly capable of receiving AM broadcasts in the KHz band.
自動車等の移動体の電波利用は、業務以外でも
AM放送、FM放送、VHF帯TV、UHF
帯TV、無線電話等、極めて広い周波数帯域に
わたる傾向にある。しかし、これらの各アンテナ
を地上高の高い（利得の良い）車両の屋根付近に
林立させれば美感上のみならず走行性能面からも
好ましくない。 Radio waves from mobile devices such as cars can be used for purposes other than work.
AM broadcast, FM broadcast, VHF band TV, UHF
Broadband TV, wireless telephones, etc. tend to cover an extremely wide frequency band. However, if these antennas are arranged near the roof of a vehicle with a high ground clearance (good gain), it is undesirable not only from an aesthetic point of view but also from a driving performance point of view.
本発明の第１の目的は、フラフープ（Hula−
Hoop）アンテナを利用してコンパクトな多チヤ
ネル複合アンテナを構成しようとするものであ
る。フラフープアンテナはDDRR（Directional−
discontinuity ring−radiator）アンテナとも呼
ばれる円周λ／４のリング状のアンテナで、その
性能は長さλ／４のホイツプアンテナに相当す
る。そして、リング状のエレメントを地板から水
平に僅か0.007λ程度浮かせただけでも受信可能と
なつた報告例もある。 The first object of the present invention is to use a hula hoop.
This is an attempt to construct a compact multi-channel composite antenna using a Hoop antenna. The hula hoop antenna is DDRR (Directional−
It is a ring-shaped antenna with a circumference of λ/4 and its performance is equivalent to a whip antenna with a length of λ/4. There are also reports that reception was possible even if the ring-shaped element was lifted horizontally by only about 0.007λ from the ground plane.
ところで、このフラフープアンテナでＫHz帯の
AM放送を受信しようとすると、その波長λが
190〜600ｍもあるので非常に大径になり、到底車
載用には使用できない。 By the way, this hula hoop antenna can be used in the KHz band.
When trying to receive AM broadcasting, the wavelength λ is
With a diameter of 190 to 600 m, it is extremely large and cannot be used in vehicles.
本発明の第２の目的は、上述したフラフープア
ンテナの地板を利用してＫHz帯の容量性アンテナ
を構成することにある。 A second object of the present invention is to construct a KHz band capacitive antenna using the ground plate of the hula hoop antenna described above.
本発明の車載用複合アンテナは、地板に対向し
てＭHz帯以上の用途に供するフラフープアンテナ
を配設すると共にその周囲を誘電体のドームで覆
い、且つ該地板を車両本体から電気的に浮かせて
配設することにより、該地板と車両本体との間を
ＫHz帯の容量性アンテナとして使用するようにし
てなることを特徴とするが、以下図示の実施例を
参照しながらこれを詳細に説明する。 The in-vehicle composite antenna of the present invention has a hula hoop antenna for use in the MHz band or higher disposed opposite to the ground plane, and its surroundings are covered with a dielectric dome, and the ground plane is electrically suspended from the vehicle body. By arranging it, the space between the ground plate and the vehicle body can be used as a KHz band capacitive antenna, which will be explained in detail below with reference to the illustrated embodiment. .
第１図は本発明の一実施例を示す断面図で、１
はフラフープアンテナ、２はその地板、３は誘電
体のドーム、４は給電用同軸ケーブル、５は車両
本体（例えば屋根）、６は地板２を本体から電気
的に浮かせる誘電体の支持体、７はFMからTV
放送用に至るＭHz帯域以上の同調回路（群）、８
はAM放送用の同調回路である。地板２は直径35
cm程度の円板で、ドーム３表面までの高さは３cm
程度である。このアンテナ１は地板２に対しプラ
スチツク等のサポータで支持される。 FIG. 1 is a sectional view showing one embodiment of the present invention.
2 is a hula hoop antenna, 2 is its base plate, 3 is a dielectric dome, 4 is a power feeding coaxial cable, 5 is a vehicle body (for example, the roof), 6 is a dielectric support that electrically floats the base plate 2 from the body, 7 is FM to TV
Tuning circuits (groups) above MHz band for broadcasting, 8
is a tuning circuit for AM broadcasting. Main plate 2 has a diameter of 35
It is a disk of about cm, and the height to the surface of the dome 3 is 3 cm.
That's about it. This antenna 1 is supported by a supporter made of plastic or the like on a ground plane 2.
AM放送以外は数10〜数100MHz帯であるから
その波長λは数ｍのオーダーである。従つて、フ
ラフープアンテナ１の直径ＤはＤ0.25λ／πよ
り、数10〜数100mmで実現できる。第２図は共通
の地板２に対向して径の異なるフラフープアンテ
ナ１ａ〜１ｃを同心円状に配設した例で、外側か
ら順にFM用、VHF−TV用、UHF−TV用とな
る。４ａ〜４ｃはそれらの給電ケーブルであり、
またC1〜C3は帯域調整用の可変容量である。第
１図のドーム３内にはこれら複数のアンテナが収
容され得る。 Since broadcasts other than AM broadcasts are in the several 10 to several 100 MHz band, the wavelength λ is on the order of several meters. Therefore, the diameter D of the hula hoop antenna 1 can be realized as several 10 to several 100 mm from D0.25λ/π. FIG. 2 shows an example in which hula hoop antennas 1a to 1c having different diameters are arranged concentrically facing a common ground plate 2, and the antennas are for FM, VHF-TV, and UHF-TV in order from the outside. 4a to 4c are their power supply cables,
Further, C 1 to C 3 are variable capacitors for band adjustment. A plurality of these antennas can be accommodated within the dome 3 of FIG.
一方、AM用には地板２をエレメントとして車
両本体５を地板とする容量性アンテナを用いる。
このアンテナの性能は地板２の面積が広く、また
その本体５から高さＨが高いほど良いが、地板２
の直径が35cmあればＨ＝５cm以上で十分である。
従つて、地板２から上が３cm程度であるから高さ
８cm程度でAMまでも含めた多チヤネルの複合ア
ンテナを構成できる。尚、第１図の同調回路の一
端は同調ケーブル４の中心導体41を通してアンテ
ナ１に接続され、他端は該ケーブルの外導体を通
して地板２に接続される。また同調回路８の一端
は該ケーブルの外導体を通して地板２に接続さ
れ、他端は本体５と同電位に接続される。このよ
うに周波数帯の異なる同調回路７，８の一端が地
板２で共通になる場合は、受信回路側でそれぞれ
の周波数に対応した十分な高周波インピダンスを
得る配慮が必要である。 On the other hand, for AM, a capacitive antenna is used in which the base plate 2 is an element and the vehicle body 5 is a base plate.
The performance of this antenna is better as the area of the ground plate 2 is wider and the height H from the main body 5 is higher.
If the diameter of is 35cm, it is sufficient that H=5cm or more.
Therefore, since the height above the ground plane 2 is about 3 cm, a multi-channel composite antenna including AM can be constructed with a height of about 8 cm. Incidentally, one end of the tuning circuit shown in FIG. 1 is connected to the antenna 1 through the center conductor 41 of the tuning cable 4, and the other end is connected to the ground plane 2 through the outer conductor of the cable. Further, one end of the tuning circuit 8 is connected to the ground plate 2 through the outer conductor of the cable, and the other end is connected to the same potential as the main body 5. If one end of the tuning circuits 7 and 8 having different frequency bands is shared by the ground plane 2 as described above, consideration must be given to obtaining sufficient high frequency impedance corresponding to each frequency on the receiving circuit side.
かかる複合アンテナの設置個所は車両の屋根に
限らず、例えば自動車のスタビライザに内蔵させ
るようにしてもよい。 The installation location of such a composite antenna is not limited to the roof of the vehicle, but may be built into the stabilizer of the automobile, for example.
以上述べたように本発明によれば、ＫHz帯から
ＭHz帯に至る多チヤネル車載用複合アンテナをコ
ンパクトに構成できる利点がある。 As described above, according to the present invention, there is an advantage that a multi-channel vehicle-mounted composite antenna ranging from the KHz band to the MHz band can be configured compactly.
第１図は本発明の一実施例を示す構成図、第２
図は多重構造のフラフープアンテナの説明図であ
る。
図中、１，１ａ〜１ｃはフラフープアンテナ、
２はその地板、３は誘電体のドーム、４，４ａ〜
４ｃは給電ケーブル、５は車両本体、６は地板２
の支持体である。
FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
The figure is an explanatory diagram of a hula hoop antenna with a multiple structure. In the figure, 1, 1a to 1c are hula hoop antennas,
2 is the base plate, 3 is the dielectric dome, 4, 4a~
4c is the power supply cable, 5 is the vehicle body, 6 is the main plate 2
It is a support for
Claims (1)
周波数の用途に供するフラフープアンテナを配設
すると共にその周囲を誘電体のドームで覆い、且
つ該地板を車両本体から電気的に浮かせて配設す
ることにより、該地板と車両本体との間を例えば
ＫHz帯の比較的低い周波数用の容量性アンテナと
して使用するようにしてなることを特徴とする車
載用の複合アンテナ。1. A hula hoop antenna for use in relatively high frequencies above the MHz band is arranged facing the ground plane, and its surroundings are covered with a dielectric dome, and the ground plane is electrically suspended from the vehicle body. A composite antenna for a vehicle, characterized in that the space between the ground plate and the vehicle body is used as a capacitive antenna for relatively low frequencies in the KHz band, for example.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58141629A JPS6051008A (en) | 1983-08-02 | 1983-08-02 | On-vehicle composite antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58141629A JPS6051008A (en) | 1983-08-02 | 1983-08-02 | On-vehicle composite antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6051008A JPS6051008A (en) | 1985-03-22 |
| JPH0412045B2 true JPH0412045B2 (en) | 1992-03-03 |
Family
ID=15296482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58141629A Granted JPS6051008A (en) | 1983-08-02 | 1983-08-02 | On-vehicle composite antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6051008A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0987789A4 (en) * | 1998-03-31 | 2004-09-22 | Matsushita Electric Ind Co Ltd | Antenna unit and digital television receiver |
| WO2000002287A1 (en) | 1998-07-02 | 2000-01-13 | Matsushita Electric Industrial Co., Ltd. | Antenna unit, communication system and digital television receiver |
| KR100891623B1 (en) * | 2007-08-13 | 2009-04-02 | 주식회사 이엠따블유안테나 | Antenna of resonance frequency variable type |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5514316B2 (en) * | 1973-02-20 | 1980-04-15 | ||
| JPS56141604A (en) * | 1980-04-05 | 1981-11-05 | Nippon Telegr & Teleph Corp <Ntt> | Microstrip antenna |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5514316U (en) * | 1978-07-05 | 1980-01-29 |
-
1983
- 1983-08-02 JP JP58141629A patent/JPS6051008A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5514316B2 (en) * | 1973-02-20 | 1980-04-15 | ||
| JPS56141604A (en) * | 1980-04-05 | 1981-11-05 | Nippon Telegr & Teleph Corp <Ntt> | Microstrip antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6051008A (en) | 1985-03-22 |
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