JPS58148503A - Reception antenna for television signal - Google Patents

Abstract

PURPOSE:To receive UHF and VHF television signals with one antenna, by constituting the antenna with a folded dipole antenna element and plural coils inserted on the way. CONSTITUTION:The antenna is formed with the folded dipole elements 1, 1 and the coils L1, L2 inserted on the way. The antenna with this constitution is used in the state that electromagnetic waves are incoming from the direction of the arrow A. In this case, relating to the television electromagnetic waves of low and high bands of VHF, the current distribution as shown in figure is obtained at a front element 2a and a rear element 2b, and the television electromagnetic waves are received excellently. Relating to the television electromagnetic waves of UHF, the current distribution as shown in figure is obtained at the elements such as front element 2a, rear element 2b, root elements 3a, 3b and tip elements 4a, 4b, and the electromagnetic waves are received excellently, similarly also in this case.

Description

[Detailed Description of the Invention] Jin's invention relates to a television receiving antenna used to receive television waves, and its purpose is to use one antenna to receive both UHF television signals and MAHF television signals. It is an object of the present invention to provide a television receiving antenna that can receive television signals.

The drawings showing the screen embodiment of the present application will be explained.

2) Daibo μ antenna KN shown in Figure 1
1.1 shows a U-shaped antenna element. Each element is 1.1K or -.
is the front element,! b indicates the rear side element, respectively.
m, 4 bti front f front side l side elements are shown. Each of the above-mentioned elements is formed using a well-known antenna confectionery material in which an aluminum material is formed into a pipe shape. b indicates the feed point and the well-known matching! ! A power supply line 7 is connected via I6.

LX indicates the first coil μ, and L indicates the second coil.

The length, value, etc. of each of the above-mentioned elements and the coil p are selected so that a current distribution as described below is generated for a low band or high band TV signal of MAHF or a TV signal of UHF. As an example, "'870mm, b.
・410 Kaidai, tl...2'10mw*s Haji...
8zOw@m,...1100su+s, f'-"1
b2 car w*, Ls...φ9.6Xg winding, wealth 1
．． 0 steel wire, L2...Φ8×3 figure winding, t-1.0 steel wire. According to experiments, it appears that almost uniform characteristics can be obtained even if the above value is increased or decreased by about 20X.

The antenna configured as described above is used in a state where radio waves arrive from the direction of the arrow M. In this case, VH! Regarding low band television waves, each element has a current distribution as shown in FIG. 2, and can receive the television waves well. It was received nine times! As is well known, low-band television radio waves are transmitted from a power supply point S to a power supply line 7 via a matching box 6.

For TV radio waves KIII of VHF 08 Ipahedo, each element has a current distribution as shown in FIG.

Therefore, in this case as well, the radio waves can be received satisfactorily, and the received radio waves are sent out to the feeder line IK in the same manner as described above.

Regarding the next KUHF television radio wave, each element has a current distribution as shown in FIG.

This allows you to receive TV signals well. The received traveling radio waves are fed as in the previous case.
&TK is sent out.

Next, Figure 6 shows the UHF11KTh of the antenna with the above configuration.
It is understood that good values were obtained over the entire UHF television broadcast band.

In addition, Figures 6, 7, and 8 respectively show the lowest frequency channel in the σHF television broadcasting band (18 channel p, frequency 470 m [Hz)], and the broadcast chat A.
/ (88 channel μ, 620 MHz) and the highest channel tv (62 channel, 770 naz) were measured and nine results are shown.

As described above, according to the present invention, VHF television radio waves can also be
Not only can you receive all HF TV waves well, but you can also obtain a good front-to-front ratio in all UHF TV broadcast bands, and when receiving UHF TV waves, you can eliminate unnecessary noise from the rear. This has the effect of allowing the target radio waves to be received well without picking up the signal.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and the top view of the first WJ#i antenna and FIGS.
11, a diagram showing the state of current distribution on the element, FIG. 5 a diagram showing the front-to-back ratio characteristic in the tiUHF band,
FIG. 6 to FIG. 8 are diagrams showing the directional characteristics of the UHF band device. 1... Ho μ def) dipole antenna element, Ll
, L Yuki ... Carp μ. Figure 1 Figure 2 Figure 4 Figure 61!1 1i8 ratio (dB) (MHz)

Claims (1)

[Claims] A television receiving antenna comprising a Hope Det Mei Po μ antenna and a Koi μ antenna interposed in the middle of the antenna so as to be able to receive UHF and VHF television signals.