JP3046610U - Broadband antenna waterproof structure - Google Patents

Abstract

(57) [Problem] To provide a waterproof antenna that can be matched to a selected frequency band corresponding to an operating frequency of a transceiver or the like. A tuning coil is wound around a coil bobbin, and a coil guide and a contact are integrated with a coil housing. Further, the waterproof pipe 8 is fitted and fixed to the coil housing portion 2 and the coil bobbin 3 by the fixing members 6 and 61. Then, the tuning coil 5 is changed by moving the adjusting rod member 1 in any of the up and down directions, and in the case of the HF band, the radiating portion of the coil housing portion 2, the tuning coil 5 and the antenna rod portion 9 are connected. The radiating part of
Tune to any frequency. In the case of the VHF band and the UHF band, tuning is performed by the radiating portion of the coil housing 2.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a waterproof structure of a broadband antenna related to the HF band or the UHF band.

[0002]

[Prior art]

 As a conventional waterproof structure of this type, as shown in FIG. 2, for example, a tuning coil and a coil housing portion are brought into contact with each other by a contact, and furthermore, a structure including an antenna rod portion is provided. It is tuned to the frequency.

The tuning of the frequency is determined with the antenna rod, the tuning coil, and the contact provided at the upper end of the coil housing as a boundary, and the variable range is the length of insertion and removal of the tuning coil. It is usually tuned to the HF band and the VHF band from its structure.

Further, as means for waterproofing the tuning coil, a sleeve-shaped waterproof pipe having a connection point at the upper end of the coil bobbin is provided outside the coil housing portion, and the coil bobbin is adjusted by an adjusting rod member. When the range of the stopper is moved in any of the up and down directions, the waterproof pipe slides accordingly.

[0005]

[Problems to be solved by the invention]

 However, in the conventional technology described above, since the sleeve-shaped waterproof pipe slides outside the coil housing, the stopper provided at the lower end of the waterproof pipe and the outer wall surface of the coil housing are connected to each other. As a result, a small gap was formed between the gaps, and as a result, there was a drawback that fine dust and rainwater entered the gap.

The present invention has been made for the purpose of improving such a drawback of a conventionally known waterproof structure of a wide band antenna.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is to attach an adjusting rod member to a lower end portion of a coil bobbin in advance and spirally wind a tuning coil connected to an antenna rod portion around the coil bobbin. In addition, the coil guide portion and the contact, and both ends of the bellows-shaped waterproof pipe are fixed and integrated with the coil bobbin and the coil housing portion by a fixing member, and the tuning coil is fixed by the adjusting rod member. It is characterized in that it can be tuned to any frequency by taking it in and out.

[0008]

[Embodiment of the invention]

 Next, an embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, a tuning coil 5 is spirally wound around a coil bobbin 3 in advance, and furthermore, an adjusting rod member 1 is taken in and out. The coil bobbin 3 and the tuning coil 5 are slid in any of the upper and lower directions.

On the other hand, the coil guide section 4 is electrically connected to the coil housing section 2, and a contact 7 is attached to an upper end portion of the coil housing section 2. And is held in pressure contact with the tuning coil 5 by using the elastic member.

The frequencies of the HF band and the VHF band (for example, 3.5 MHz band to 28 MHz band and 50 MHz band) are divided into a portion where the tuning coil 5 protrudes from the contact 7, an antenna rod 9 and the antenna rod 9. The frequency is tuned to an arbitrary frequency by the radiating portion of the coil housing 2.

As a method of tuning the frequency between the VHF band and the UHF band, for example, since the wavelength of 144 MHz, which is the frequency of the VHF band, is about 2 cm, it is used as a 1/4 wavelength grounded antenna (length about If the antenna gain is taken into account at 430 MHz (wavelength of about 70 cm), which is the UHF band frequency, it is better to use 5/8 wavelength for the length of 1/2 wavelength. If it is the most appropriate length and is used in two stages, it can be shared with the 144 MHz quarter-wave grounded antenna.

The above-described common antenna for the VHF band and the UHF band is operated as a wideband antenna by applying the antenna to the coil housing 2.

At this time, the influence of the antenna rod 9 can be prevented by operating the tuning coil 5 as a high-frequency inductance with respect to the frequency of the 144 MHz band or the 430 MHz band. .

Next, the upper end of the bellows-shaped waterproof pipe 8 is fixed to the upper end of the coil bobbin 3 by using a fixing member 6, and the lower end of the waterproof pipe 8 is fixed to the upper end of the waterproof pipe 8 by using a fixing member 61. The waterproof pipe 8 expands and contracts by being fixed to the substantially upper end of the storage section 2 in combination with the sliding of the coil bobbin 3.

[0015]

[Effect of the invention]

 Since the present invention has the above-described structure, it has excellent effects as described below.

Since the waterproof pipe can be fixed by the fixing member, complete waterproofing can be performed.

Further, by providing the coil guide portion, the area in contact with the tuning coil in the coil housing portion can be increased, so that more stable operation can be performed.

Since the area for holding the tuning coil by the coil guide portion is large, the strength can be increased mechanically, and further, the influence between the coils at the contactor can be eliminated. it can.

Furthermore, since the effective area of the coil housing portion is wide, when this is used as a component of the antenna, the range of operable frequencies is widened.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Adjustment rod member 2 Coil storage part 3 Coil bobbin 4 Coil guide part 5 Tuning coil 6,61 Fixing member 7 Contact 8 Waterproof pipe 9 Antenna rod part

Claims (1)

[Utility model registration claims] 1. A tuning coil (5) connected to an antenna rod (9) is wound around a coil bobbin (3) in advance, and a coil guide (4), a contact (7), and a bellows-like shape are provided. Both ends of the waterproof pipe (8) are fixedly integrated with the coil bobbin (3) and the coil housing portion (2) by fixing members (6, 61), and an adjusting rod is provided at a lower end of the coil bobbin (3). While attaching the member (1), the tuning coil (5) can be tuned to an arbitrary frequency by inserting and removing the tuning coil (5) with the adjusting rod member (1) while elastically pressing and holding the contact (7). A waterproof structure for a broadband antenna, characterized by being obtained.