JPS62188507A - Antenna system - Google Patents

Abstract

PURPOSE:To obtain an antenna system with excellent impedance characteristic by loading a filter between a feeder and plural unipole antennas and providing the unipole antennas on a dielectric rod so as to excite them at respective resonance frequency of radio wave thereby incorporating the linear unipole antennas. CONSTITUTION:The power from an oscillation source 1 enters a filter 9 via a feeder 2 and the filter 9 excites mainly the plate unipole antenna 7a, 7b or 7c in response to the frequency. In this case, the plate unipole antenna excited mainly differs from the frequency and the radio wave is radiated efficiently from the excited plate unipole antenna. The dielectric rod 8 supports the plate unipole antennas 7a-7c to incorporate them. Thus, the impedance characteristic is improved, the antenna system is incorporated and the strength is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an antenna device for a mobile object with excellent impedance characteristics.

[Conventional technology]

Figure 3 is an example of the Journal of the Institute of Electrical Communication Engineers, Vol. 49, No. 5, pp. 8.
83 to 890 (May 1960), and FIG. 3(a) is a view seen from above;
FIG. 3(1)) is a side view. In the figure, (1)
is the oscillation source, (2) is the supply ``Iltim, (3a), (3
bL (3c) is a support/feeder line that also serves as antenna support, (4→, (4b) I(4Q) is a linear unipole antenna, and (5) is a ground conductor. Conventional antenna devices are Since it is configured as follows, what is the power and power from the oscillation source (1)?
a), (3b), (3(ri). This distributed power is distributed to the linear unipole antenna (4a
) 1 (4b) # <4c) VC is supplied and radiated into space. Linear unipole antenna ((4a) l
(4b) If the length of 1 (4C) is different, the resonance frequency of each linear unipole antenna will be different. Therefore, by appropriately selecting the length of the linear unipole antenna, this antenna device has broadband impedance characteristics.

[Problem that the invention seeks to solve]

In the conventional antenna device as described above, the deer passing through the feed line (2) is connected to the linear unipole antenna (4a).

(4b), (4c) Since it is distributed by K, the power of frequencies other than the frequency that has the most residual root in each linear unipole antenna is also supplied to that linear unipole antenna. In this case, there is a problem in that the reflected wave from the linear unipole antenna with no residual root returns to the feed line (2), resulting in poor input impedance characteristics. Also, linear unipole antennas (4a) and (4b).

There was a problem in that it was difficult to maintain the mutual parallelism of (4c), and it was necessary to strengthen the support/feeder lines (3a), (3b), and (3C).

This invention was made to solve this problem, and it excites each linear unipole antenna only with radio waves of the respective common imaging frequencies, and also integrates the linear unipole antennas to improve impedance characteristics. The object is to obtain an excellent antenna device.

[Means for solving problems]

In the antenna device according to the present invention, a filter is loaded between a feeder and a plurality of unipole antennas, and the unipole antennas are integrated into one dielectric rod.

[For production]

In this invention, each unipole antenna is excited with a radio wave of its respective residual frequency by a filter loaded between the feed ti and the plurality of uniball antennas, and
By providing a plurality of unipole antennas on one dielectric rod, the relative position of each unipole antenna does not move, and the strength can be increased.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of this invention, (1)
, (2) is the same as the above conventional device. (6
a).

(6b) and (6c) are the distribution dt lines that feed the planar unipole antenna (7a) + (7b) I (7C), respectively, and (8) is the planar uniball antenna (7a).
f ('1lb) I (7c) A dielectric rod is provided at ', and (9) is a filter. Plate unipole antenna (7a).

(7b), (7c) K Dielectric rod (8) K can be provided by applying conductive tape, etching, gluing a conductor plate, etc. 0 Constructed as above In the antenna installation dVc, the power from the oscillation source (1) is passed through the feed line (2) to the filter (9).
) Enter K. The filter (9) is a plate-shaped uniball antenna (7a), (7b) or (7) depending on the frequency.
It has the function of mainly exciting C). At this time, the plate-shaped uniball antenna that is mainly excited differs depending on the frequency.
Efficiently emit space from an excited plate-shaped unipole antenna? [Waves are radiated. The dielectric rod (8) supports the plate-shaped unipole antenna (7aL (7→s ('i'c) 0 FIG. 2 is a diagram showing an embodiment of the filter (2).

(5) is the same as that in Figure 3, and ('i'a) +
e7b) and (7C) are the same as those in Figure 1.0 is a high-pass filter, (b) is a low-pass filter, (2) is a bandpass filter, and ←3a) to ←3d) are filters. The constituent capacitors 4a) to (Z4a) are coils. In this embodiment, when the radio waves that have passed through the feed line (2) have a high frequency, they are sent to the plate-shaped uniball antenna (7a).
When the frequency is low, the planar unipole antenna c7C)
mainly enters. When the frequency is intermediate, a bandpass filter (2
), power is mainly supplied to the plate-shaped unipole antenna (7b). In this way, the frequency of the radio waves used is 17i
: Power is supplied only to the suitable unipole antenna, so reflection from other unipole antennas does not occur, and input impedance deterioration does not occur.0 In addition, in the above embodiment, the case of transmission was explained.
The same applies to reception. Please note that the cross section of the four-body rod is not limited to a circular shape, but may be of other shapes such as an ellipse. moreover,
A hollow dielectric tube may be used instead of the dielectric rod.

〔Effect of the invention〕

As explained above, in this invention, impedance characteristics can be improved by loading a filter between a feed line and a plurality of unipole antennas, and by providing a uniball antenna on a dielectric rod, this antenna can be improved. The device can be integrated and strengthened.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a block diagram showing an embodiment of a filter, and Fig. 3 shows a conventional antenna device. (a) is a front view, and (b) is a side view. It is. In the figure, (1) C oscillation source, (2) C supply ti, (3a
) to (3C) are supporting/feeding lines, (4a) to (4C) are linear unipole antennas, (5) are ground conductors, (6a) to
(6C) is a distribution wire, (7→~(]C) is a plate-shaped unipole antenna, (8) is an inducer rod, (9) is a filter,
QO is a high-pass filter, (b) is a low-pass filter, (2)
is a bandpass filter, u3) to 3 are capacitors, (14
a) to Q4d) are coils. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (3)

[Claims] (1) In an antenna device comprising a plurality of linear or plate-shaped unipole antennas and one feeder line, the plurality of unipole antennas are fed in parallel with one feeder line. An antenna device characterized in that a filter is loaded between a unipole antenna and the feed line. (2) In an antenna device that uses three unipole antennas of different lengths, the filter is designed to handle the low frequency range corresponding to the longest unipole antenna, the shortest unipole antenna, and the intermediate length unipole antenna. filter,
The antenna device according to claim 1, wherein the antenna device is a high-pass filter or a band filter. (3) The antenna device according to claim 1 or 2, characterized in that a plurality of unipole antennas are provided on the surface of one dielectric rod.