CN2502415Y - Coil aerial with high dielectric coefficient cap - Google Patents

Abstract

The utility model discloses a coil aerial with high dielectric coefficient cap. An insulating end part of the coil aerial is assembled with a cap, with a coil fixed between the insulating end part and the cap, wherein, the cap is made of a coil aerial with high dielectric coefficient material and the inside of the cap is provided with a one-time molded internally extending pole which can match with the internal diameter of the coil; the high dielectric coefficient can be formed in the coil through the adoption of the internally extending pole so as to relatively reduce the length of the wave. Hereby, an improved coil aerial comes into being. The coil aerial can increase the stability of the electric appliances during the vertical guidance and make the whole length of the coil aerial effectively shortened.

Description

Coil antenna with high-dielectric coefficient cap

Technical field

The utility model relates to a kind of coil antenna with high-dielectric coefficient cap, refers in particular to the coil antenna that can shorten antenna length effectively behind the structural improvement through the antenna cap and increase electric stability.

Background technology

Establishing the helical coil that forms with the metal wire silver lap is the main element of antenna as transmitting-receiving frequency, and the each side structure of this helical coil antenna (helix antenna) all can have influence on the function of entire antenna.As British patent the 2nd, 206, disclosed coil antenna in No. 243, its coil diameter (Diameter of wire), coil method (Material of wire), internal coil diameter (core diameter of helix), circle all can have influence on the function that entire antenna should have and set apart from (pitchof helix), total length (overall length) etc.Simultaneously, no matter traditional coil antenna or microstrip antenna widely day by day now, its preset length mostly is to cooperate wavelength X to be provided with.

The general equipment that uses this type of coil antenna, with the mobile phone is example, it is the inner via hole that coil is placed an insulating coating pipe, coil is assembled in the inner via hole of outer tube to compressive state with elastic shaft, because the characteristic of coil, make this assembling structure can to the circle of coil apart from and total length cause the influence that is difficult to expect, promptly the coil after the assembling can change, making the total length after the assembling is not original total length of setting.Thereby make conventional coil when assembling and a large amount of production, cause the quality difference of the antenna of producing every day easily.

As shown in Figure 1, the conventional coil antenna includes an insulating coating pipe 10, a cap 11 and a coil 12.This coil 12 is inserted in the insulating coating pipe 10 in advance in the endoporus 13 of upper shed, and imposes high frequency weld job program when fit cap 11, and an end of coil 12 is pressed on the inner top surface 14 of cap 11, and the other end is pressed against on the inner bottom surface 15 of endoporus 13.This loop construction commonly used except coil 12 behind assembling location, upright total length can obviously be affected because of the reelability structure of coil itself, and make electric stability undesirable outside, also owing to be full of air in the centre of coil 12, because the dielectric coefficient of air is less, as can be known by the wavelength formula: $\mathrm{\λ}=\frac{c}{f\sqrt{\mathrm{\δ}}}$

Wherein λ is a wavelength, and c is an electric capacity, the f frequency, and δ then is a dielectric coefficient, because the dielectric coefficient of air is 1, under the less situation of δ, λ can increase relatively, therefore makes entire antenna length also need lengthening relatively.But as the Communication Equipment of mobile phone and so on, miniaturization is its main designer trends now, and coil is set as than length for adapting to wavelength, is to be difficult to meet required requirement.

Summary of the invention

For this reason, the coil antenna that has the high-dielectric coefficient cap in the utility model mainly is undesirable and wavelength is long and then cause the long problem of length of coil in order to solve above-mentioned electric stability.

The coil antenna that has the high-dielectric coefficient cap in the utility model is to be assembled with cap in the insulation end, and between this insulation end and cap, be fixed with a coil, wherein, described cap is made by high-k material, and portion is formed with the interior extending column that can cooperate internal coil diameter within it, utilize and be somebody's turn to do interior extending column portion's formation in coil high-dielectric coefficient, to reduce wavelength relatively.

Wherein, described cap and interior extending column can be made by the insulation plastic material, and determine its dielectric coefficient.

In addition, the described cap central position of end face within it is formed with the interior extending column that matches with the size and shape of internal coil diameter in the cross section, and both can be matched with required elasticity.

Coil antenna in the utility model is owing to be formed with an interior extending column that can match with internal coil diameter in cap inside, coil is positioned and has preferable perpendicularity and stable electrical characteristic, simultaneously, by the wavelength formula as can be known, owing to extend inner prop, make the dielectric coefficient of coil inside increase, thereby wavelength X is reduced relatively, shorten antenna length effectively.

Description of drawings

Fig. 1 is the structure cross-sectional schematic of conventional coil antenna;

Fig. 2 is the cross-sectional schematic when cap and coil are in bonding state in the utility model;

Fig. 3 is the cross-sectional schematic that cap in the utility model, coil combine with the insulating coating pipe.

Embodiment

As shown in Figures 2 and 3, the coil antenna that has the high-dielectric coefficient cap in the utility model include a cap 20, in order to engage the insulated tube 30 and the Inside coil 40 of cap 20.Cap 20 central position of end face 22 within it is provided with an interior extending column 24, and extending column 24 is linked in the coil 40 in this.Therefore, cross section of extending column 24 preferably is made as and can cooperates the size and the shape of coil 40 internal diameters (core diameterof helix) to match in this, and both can be matched with suitable elasticity.

Cap 20 portion within it is provided with an interior step 26, insulated tube 30 then can be preset with step 31 outside in its outside, make the upper surface 33 of the lower surface 28 of cap 20 and insulated tube 30 when assembled state, just also be resisted against outside on step 31 and the interior step 26 and position, thereby make between the interior terrace 35 of inner top surface 22 that Inside coil 40 can be fixed on cap 20 with the circle distance set and total length and insulated tube 30.

Find out from above structure, set coil diameter, internal coil diameter, circle apart from and the coil 40 of total length in assembling process, support by interior extending column 24 earlier, rather than with unsupported combinations of states in cap 20 and insulated tube 30 inside.Therefore in manufacture process, it encloses distance and the influence because of keeping the formed total length of perpendicularity all can not be subject to processing, and has more stable and reliable electrical characteristic.

Simultaneously, the hollow bulb of coil 40 is filled up by interior extending column 24, and the dielectric coefficient that promptly originally is full of air is changed, if cap 20 and Qi Nei extending column 24 are integrally formed by plastic material, and the dielectric coefficient of this type of plastic material (being δ) is generally about 2.2.

By above-mentioned wavelength formula as can be known, when coil 40 other member supports of no use, when portion is full of air (dielectric coefficient of air is 1) within it:

After coil 40 and cap 20 are improved with aforementioned structure,

Using under equivalent capacitance (c) and the same frequency (f), wavelength in the utility model (λ ')=0.674 λ, be whole cap 20 and coil 40 when using dielectric coefficient to be about 2.2 material forming cap and interior extending column thereof, can shorten the length of coil about 1/3, reduce the material that consumed thereby can have, and the longitudinal length of whole winding antenna is shortened and miniaturization.

Above-mentioned cap 20 and the interior extending column 24 integrally formed with it can not use conductive plastic, and need to use the insulation plastic material one-body molded, and the dielectric coefficient of certain selected plastic material is high more, and the size that antenna can shorten is also more obvious.

Astragal antenna in the utility model since in advance coil is enclosed within the integrally formed interior extending column 24 of cap on, therefore in the production and assembly process of entire antenna, the perpendicularity of coil can be by correcting, circle is also improved significantly apart from affected situation, the electric stability of entire antenna is also even more ideal, thereby the disqualification rate in when assembling also can reduce.Simultaneously, the coil antenna in the utility model can shorten the antenna length of whole communication apparatus effectively, and is suitable for the miniaturization development of antenna.

In addition; above-mentionedly only the specific embodiment in the utility model is described in detail; but can not be as protection range of the present utility model, every various modifications of being made according to the design spirit in the utility model change with equivalence, all should think to fall into protection range of the present utility model.

Claims (3)

1. coil antenna with high-dielectric coefficient cap, be assembled with cap in the insulation end, and between this insulation end and cap, be fixed with a coil, it is characterized in that: described cap is made by high-k material, and portion is formed with the interior extending column that can cooperate internal coil diameter within it.

2. according to the coil antenna with high-dielectric coefficient cap described in the claim 1, it is characterized in that: described cap and interior extending column are made by the insulation plastic material.

3. according to the coil antenna with high-dielectric coefficient cap described in the claim 1, it is characterized in that: the described cap central position of end face within it is formed with the interior extending column that matches with the size and shape of internal coil diameter in the cross section.

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