CN2101329U

CN2101329U - Miniature tv receiving antenna

Info

Publication number: CN2101329U
Application number: CN 91215898
Authority: CN
Inventors: 何登田
Original assignee: Tianxia Electronics & Electrical Appliance Co ltd Shanghai
Current assignee: Tianxia Electronics & Electrical Appliance Co ltd Shanghai
Priority date: 1991-09-13
Filing date: 1991-09-13
Publication date: 1992-04-08

Abstract

The utility model relates to a miniature TV receiving antenna, comprising a thin type printed board, an output terminal, and a metal wire. The utility model is characterized in that a frequency selective device which is composed of induction coils L[1], L[2] and capacitors C[1], C[2] is installed on the thin type printed board, wherein, the front and the back sides of the thin type printed board are respectively covered by L[1] and L[2]; the thin type printed board adopts double-side metallic copper film to print a thin film board. The miniature TV receiving antenna of the utility model has the advantages of convenient installation, small size, and beautiful appearance. The utility model achieves the effects of double image elimination and sharp received images for each channel, being particularly suitable for being used as an outdoor television receiving antenna.

Description

Miniature TV receiving antenna

The utility model relates to a kind of television receiving antenna, particularly a kind of micro-television reception antenna.

Existing indoor and outdoor active tv reception antenna is made up of element antenna, VHF, UHF amplifier etc.The output level of this antenna immobilizes, and all belongs to traditional directionality television receiving antenna, and at present commercially available is exactly such antenna.Because output level is constant, reception is undesirable, regulates inconvenience and time-consuming in addition, again because of being directed, can not be compatible so be subjected to the effect of watching that obstacle reflection such as high building easily produces ghost image, each channel when receiving again, and influence and watch effect.So people are improved one after another by every means, the television receiving antenna that development is novel is as increasing by one gain control-Chinese patent CN90207019, though can reach the good effect of watching at output, but also can only be, and complex structure as indoor active tv reception antenna.The ultrathin television receiving antenna of Chinese patent CN85203880-and for example, but still do not break away from above-mentioned formula, just element antenna, reflector are made with metal forming or metal film, though in light weight, and watch that effect is not good enough, and regulate also inconvenience.

The purpose of this utility model provides the good micro-television reception antenna of little, the round-the-clock selection performance of a kind of volume.

The utility model is realized as follows: it comprises slim printed board, lead-out terminal, plain conductor, also installs one by induction coil L in slim printed board simultaneously ₁～L ₂, capacitor C ₁～C ₂The frequency selective device that constitutes, L ₁An end and L ₂An end be connected in series L with plain conductor ₁The other end and capacitor C ₂End serial connection, C ₂The other end be connected to lead-out terminal, L ₂The other end also be connected on the lead-out terminal capacitor C ₁And is connected on the lead-out terminal.Induction coil L ₁, L ₂Cover respectively on the positive and negative two sides of slim printed board, and slim printed board is the printed film plate that adopts the double-sided metal copper film that its thickness is 2～3 millimeters, size and induction coil L ₁, L ₂The number of turns be directly proportional.

Because micro-television receiving antenna device of the present utility model is the printed film plate that adopts the double-sided metal copper film, so when frequency electromagnetic waves induces high-frequency current in the metal surface, through induction coil L ₁, L ₂, capacitor C ₁～C ₂The frequency selective device that constitutes just can be selected the TV signal of all-channel effectively and send into the television set high-frequency receiver, its receiving sensitivity depends on the size and the receive direction of induction area, also promptly receives the strongest composite video signal in the minimum area scope effectively.Again owing to be to adopt the monolithic printed board, so under the condition that does not reduce receiving sensitivity, improved the selectivity of reception antenna, thereby increased the antijamming capability of antenna, just adopt common electric capacity because of frequency selective device of the present utility model again, induction coil is again to cover in the slim printed board of monolithic, so its good looking appearance is light and handy, simple in structure, easily manufactured, selectivity is good in addition, so each channel all has the satisfied effect of watching, be not subjected to simultaneously influencing of external environment, Installation and Debugging are convenient.

The utility model is described in further detail below in conjunction with accompanying drawing:

Fig. 1 is a profile schematic diagram of the present utility model.

Fig. 2 is an electrical schematic diagram of the present utility model.

Fig. 3 is a structural representation of the present utility model.

As shown in Figure 2, when frequency electromagnetic waves at induction coil L ₁, L ₂Surface induction go out high-frequency current through capacitor C ₁～C ₂Send into the high-frequency receiver of television set after the frequency-selecting by lead-out terminal, its faradic size and induction coil L ₁, L ₂The number of turns relevant.

As shown in Figure 3, slim printed board 1 is to adopt commercially available two-sided copper film epoxy printed film plate, draws required induction coil L on its positive and negative two sides with the general protection paint that is insoluble to ferric trichloride ₁, L ₂The number of turns (be generally 6～8 circle), immerse and can obtain required induction coil L after corroding cleaning in the liquor ferri trichloridi then ₁, L ₂, be drilled with thereon again in order to capacitor C to be installed ₁, C ₂, the aperture of lead-out terminal 2 (size is that 1 centimetre, quantity are 6～7), with metallic copper lead 3 with L ₁An end and L ₂One end of (not marking among the figure) connects; And then with capacitor C ₁, C ₂Lead-out terminal 2 is installed in the slim printed board 1, again lead-out terminal 2 is connected coaxial wire, in order to connect the high-frequency receiver of television set, C ₁～C ₂Capacitance be generally 10～20Pf.

The above-mentioned receiving antenna device that assembles is installed in the ABS(or the PBT of injection moulding) in the shell, get final product with the poured with epoxy resin encapsulation then.

Claims

1, a kind of micro-television reception antenna comprises slim printed board 1, lead-out terminal 2, plain conductor 3, it is characterized in that also installing one by induction coil L in slim printed board 1 ₁～L ₂, C ₁～C ₂The frequency selective device 4 that constitutes, induction coil L ₁An end and L ₂An end with plain conductor 3 serial connection, L ₁The other end and capacitor C ₂End serial connection, C ₂The other end be connected on the lead-out terminal 2 capacitor C ₁And is connected on the lead-out terminal 2.

2, by the described micro-television reception antenna of claim 1, it is characterized in that above-mentioned induction coil L ₁, L ₂Cover respectively on the positive and negative two sides of slim printed board 1, slim printed board 1 is to adopt double-sided metal copper film printed film plate, and its thickness is 2～3 millimeters, its size and induction coil L ₁, L ₂The number of turns be directly proportional.

3, by the described micro-television reception antenna of claim 1, it is characterized in that induction coil L ₁, L ₂The number of turns all be 6～8 the circle.