CN1937317A - Multi-mode and multi frequency band combined antenna - Google Patents

Abstract

The disclosed composition antenna in multimode and multiple frequencies includes a conduction seat. A helical antenna with heteropic windings is setup on the conduction seat; and a pole antenna is setup on the helical antenna. The composition antenna can tune the helical antenna to two or more than two resonance frequency ranges. The pole antenna can be tuned to resonance frequency range different from resonance frequency ranges tuned by the helical antenna. Thus, the composition antenna can tune three or more resonance frequency ranges.

Description

The combined antenna of multimode and multiband

Technical field

The present invention is relevant for combined antenna, refer to especially a kind of in conjunction with helical antenna and utmost point sub antenna on a conductive seat, form the antenna of a multimode and multiband, make this antenna may be tuned to frequency range more than three or three.

Background technology

In recent years, because electronic industry is flourish, related make various portable radio communication product (as: mobile phones, personal digital aid (PDA) or radio network telephone ... etc.) constantly weed out the old and bring forth the new, and on these portable radio communication products, increase various function, and these portable radio communication products are to use various function and wireless telecommunication system, adopt different frequencies respectively, with at present, main standard wireless telecommunication system is that the global system for mobile telecommunications modular system (or claims: pan-European digital mobile telephone system, English is translated: GlobalStandard for Mobile Communications, be called for short: GSM) with (the CodeDivision Multiple Access of code division multiple access incoming communication system, be called for short: CDMA) two big classes, wherein the frequency range of global system for mobile telecommunications modular system mainly is divided into 850 MHz (MHz), 900MHz, 1800MHz, 1900MHz.And the CDMA 800MHz, the 1900MHz that are that the frequency range of code division multiple access incoming communication system adopts.

In addition, because the wireless telecommunication system difference that adopt countries in the world, therefore if go to different countries, the mobile phone that needs is also different, for example: the U.S. adopts the global system for mobile telecommunications modular system, it uses frequency range to be 850MHz/1900MHz, European Region adopts the global system for mobile telecommunications modular system, it uses frequency range to be 900MHz/1800MHz, and Korea S adopts code division multiple access incoming communication system, and it uses frequency range to be 800MHz/1900MHz, the global system for mobile telecommunications modular system is adopted in Australia, it uses frequency range to be 900MHz/1800MHz, and south east asia adopts the global system for mobile telecommunications modular system, and it uses frequency range to be 900MHz/1800MHz.

From the above, single-frequency mobile phone has not in the past applied and has used, therefore, (as: the Motorola of manufacturer that some portable radio communication products are arranged, Nokia, Sony Ericsson ... etc.), promptly at this problem, develop double frequency or three multimode portable radio communication product (as: three-frequency mobile phone) frequently, with three frequency multi mode terminals, be exactly that mobile phone supports 900,1800, frequency range such as 1900MHz and 2.4GHz, again can be at the global system for mobile telecommunications modular system, use in code division multiple access incoming communication system and the wireless network, or for can further use at personal handy phone system (Personal Handy-phone System, be called for short: PHS), bluetooth (BLUETOOTH) and global positioning system (GPS) ... wait on the wireless communication networks are in order to avoid the user will constantly change sternly product of different mobile phones or other portable radio communication between zones of different/country.

And in double frequency or three multimode portable radio communication product frequently, for receiving different 900,1800, frequency range such as 1900MHz and 2.4GHz, wherein most important part, it promptly is antenna at double frequency or three multimode portable radio communication product frequently, U.S.'s " multi-band non-uniform helical antennas " patent of invention (No. the 6112102nd, United States Patent (USP)) for example, see also shown in Figure 1, be that a helical antenna 1 has one first part, 10 and 1 second part 12, wherein this first part 10 has different inclinations angle respectively with second part 12, coil diameter, length, the spiral number of turns and circle distance, make this first part 10 and second partly 12 form the helical antenna 1 that can receive two or more frequency ranges respectively, and if this kind helical antenna 1 is used in double frequency or three multimode portable radio communication product frequently, by the inclination angle that changes this helical antenna 1, coil diameter, length, parameters such as the spiral number of turns and circle distance, can finish the tuning of resonance frequency easily, in order to receive wireless signal from various frequency range.

Again, the TaiWan, China patent of invention (Taiwan is announced No. 549621) that is called " communication apparatus multifrequency helical antenna structure " in name, think U.S.'s " multi-band non-uniform helical antennas " patent of invention, its helical antenna is in the course of processing, will influence the former parameter of finishing with setting (as: inclination angle and circle distance), and can receive and dispatch the unsettled situation of signal, or helical antenna is difficult for reaching the multifrequency demand, therefore, this Taiwan patent case is provided with positioning piece 2 in the inside of helical antenna, fix this helical antenna 1 by this keeper 2, and as the antenna (as shown in Figure 2) that receives the 3rd frequency range.

But, the patent of invention of " the communication apparatus multifrequency helical antenna structure " of TaiWan, China, utilizing this keeper to do 2 is the mode that receives the antenna of the 3rd frequency range, be to be provided with the metal micro-strip line 20 that to mate with helical coil on these keeper 2 surfaces, in other words, this keeper 2 is for finishing the tuning of resonance frequency, be still the various parameters that depend on this helical antenna 1, the position and the shape thereof that make these metal micro-strip line 20 settings, will be subject to this helical antenna 1, make the setting of the 3rd frequency range, still exist processing and go up shortcoming, for example: this keeper 2 must be provided with the groove 22 that matches with coil, if set groove 22 positional faults of this keeper 2, will cause this helical antenna 1 and keeper 2 can't be tuned to correct reception and transmit frequency band, again, the size of groove 22 must cooperate the line footpath of helical antenna 1, if groove 22 too king bolt antenna 1 can't be fixed in this groove 22, if groove 22 too little then these helical antennas 1 can't embed in this groove 22.

Summary of the invention

Because aforesaid many shortcomings, the inventor is through the permanent research and experiment of making great efforts, and development and Design goes out the combined antenna of a kind of multimode of the present invention and multiband finally, in the hope of by proposition of the present invention, can contribute to some extent society.

One object of the present invention is, the combined antenna of a kind of multimode and multiband is provided, it is a helical antenna that on a conductive seat, is provided with non-homogeneous coiling, and this conductive seat is provided with a utmost point sub antenna in this helical antenna, and this helical antenna and utmost point sub antenna can be by adjusting its physical property parameter, this helical antenna and utmost point sub antenna may be tuned to different resonance band respectively, make this combined antenna may be tuned to resonance band more than three or three altogether.

Be in another object of the present invention, this helical antenna has first coil part and second coil part, wherein this first coil partly partly respectively has physical property parameter inequality with second coil, make this first coil part and this second coil partly may be tuned to different resonance band respectively, and this first coil partly and this second coil resonance band partly, is different from the resonance band of this utmost point sub antenna.

Be that in another purpose of the present invention this utmost point sub antenna can be by adjusting its physical property parameter, make its be tuned to be different from the resonance band of this helical antenna.

For ease of to the object, the technical characteristics and the effect of the present invention, do further understanding and understanding, for the embodiment conjunction with figs., be described in detail as follows now:

Description of drawings

Fig. 1 is the schematic diagram of the helical antenna of known non-homogeneous coiling;

Fig. 2 is the helical antenna of known non-homogeneous coiling and the schematic diagram of keeper;

Fig. 3 is a schematic appearance of the present invention;

Fig. 4 is decomposition of the present invention and schematic equivalent circuit;

Fig. 5 is the test result schematic diagram of one embodiment of the invention.

Embodiment

The present invention is the combined antenna of a kind of multimode and multiband, see also shown in Figure 3, be provided with a conductive seat 3, this conductive seat 3 is provided with a helical antenna 4 of non-homogeneous coiling, this helical antenna 4 has partly 40 and second coil part 42 of first coil, wherein this first coil part, 40 and second coil part 42 respectively has the physical property parameter (as: inclination angle of antenna inequality, coil diameter, length, the spiral number of turns and circle distance etc.), make this first coil part 40 and this second coil partly 42 may be tuned to different resonance band respectively, again, this conductive seat 3 is provided with a utmost point sub antenna 5 in these helical antenna 4 inboards, this utmost point sub antenna 5 can be by adjusting its physical property parameter (as: length of antenna or line footpath etc.), make this utmost point sub antenna 5 may be tuned to the resonance band that is different from this helical antenna 4, so, this combined antenna 6 can by this helical antenna 4 be tuned to two or more resonance band, and by this plank antenna 5 be tuned to be different from the resonance band of this helical antenna 4, make this combined antenna 6 may be tuned to resonance band more than three or three.

From the above, this combined antenna 6 does not utilize the identical assembly of any and known keeper, be used for fixing this helical antenna 4, its main cause is the explanation as prior art, the known locations part is being made the restriction that is caused on the groove, with the puzzlement that causes the known locations part in processing and assembling, and, then have following several advantages if change the known locations part into this utmost point sub antenna 5:

1, installation is convenient rapidly, and 4 of helical antennas do not need any assembly;

2, the applicant finds after experiment repeatedly, the helical antenna 4 former parameters of finishing with setting (as: inclination angle and circle distance), with present process technology, in the course of processing, can't too much influence be arranged to helical antenna 4, only artificial or accident collision, and cause helical antenna 4 to be out of shape, the damage of right unexpected situation of this kind or malice, when being not patent application still the prediction, in other words, the known locations part is a kind of improvement of non-essential fully, and the present invention utilize utmost point sub antenna 5 can reach easily be tuned to be different from the purpose of the resonance band of helical antenna 4;

3, the known locations part need be provided with microstrip antenna, and needs the production process through complicated microstrip antenna, reviews, and utmost point sub antenna 5 can be by change length or line footpath, can be easily be tuned to various frequency ranges, can save manufacturing time and cost of manufacture.

In another preferred embodiment of the present invention, see also shown in Figure 3, these helical antenna 4 these first coils are 40 tiltangle 1 partly, tiltangle 2 less than this second coil part 42, make this first coil partly 40 circle apart from S1, also the circle than this second coil part 42 is little apart from S2, and first coil of this helical antenna 4 is 40 and 1 second coil part 42 partly, can be regarded as N planar circular serial connection respectively approx forms, can regard the antenna array of forming with coil antenna as, and according to aforementioned first coil 40 and second coil, 42 shape partly partly, distance becomes upper tightly lower sparse shape between these helical antenna 4 each helical coils, two kinds of modes of structuring the formation have been that is to say, form the distributed inductance loaded antenna that is operated in two frequency ranges respectively, its fundamental characteristics is decided by the ratio (being D/ λ) of screw diameter D and wavelength X, D/ λ＜1.8 of two wave bands, therefore, also can be described as a kind of normal direction mode helical antenna (Normal Mode Helix), it is shown in Figure 4 that E looks like, if D is the average diameter of spiral, S is a pitch, h is an axial length, l is the average length of every circle, θ is a helical angle, N is the number of turns, and A is little anchor ring long-pending (regarding each spiral coil as a little ring), and E face electric field and direction coefficient are as follows:

$\left.\begin{array}{c}{\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="A20051002982900131.png"\; state="\{\{state\}\}">l</figure-callout>}}^2={\mathrm{<figure-callout\; id="2"\; label="S"\; filenames="A20051002982900131.png"\; state="\{\{state\}\}">S</figure-callout>}}^2+{\left(\mathrm{\&pi;D}\right)}^2={\left(\frac{S}{\mathrm{Sin\&theta;}}\right)}^2\\ h=\mathrm{NS}\end{array}\right\}$

$E_{\mathrm{\&theta;}}=j\frac{60\mathrm{\&pi;I}}{r}\frac{S}{\mathrm{\&lambda;}}\mathrm{Sin\&theta;}$

Again, to can be considered be by first coil, 4 spiral coils of 40 (L1 (average length of first coil every circle partly) * N1 partly to this helical antenna 4; N1=4) and second coil, 5 spiral coils of 42 (L2 (average length of second coil every circle partly) * N2 partly; N2=5) composition one has the first synthesis unit C1 of 9 spiral coils, and first coil partly the height h of total pitch of 40 and second coil part 42 (be S1 * N1+S2 * N2), then form the second synthesis unit C2 with 4 spiral coils, this helical antenna 4 utilizes this first synthesis unit C1 and the second synthesis unit C2 by the humorous two-band of being transferred to, so, these helical coils just have the antenna of two kinds of equivalent lengths, the one, and the helix total length of whole helical antenna (L1 * N1+L2 * N2), another then is these length h of imitating leads (S1 * N1+S2 * N2)), each equivalent length correspondence a working frequency range, in the present invention, these helical antenna 4 parts exist 850-950MHz and two resonance band of 1800-1900MHz, four resonance frequencies, as shown in Figure 5.Each unit is made of another spiral coil and an electric Hertz antenna.Because the diameter of spiral coil is very little, the electric current on each synthesis unit can be thought the constant amplitude homophase, and by theoretical and experiment showed, CURRENT DISTRIBUTION along the axis direction of spiral coil still near Sine distribution, it is a kind of slow wave structure again, and electromagnetic wave is along axis propagation.

And in this embodiment, this utmost point sub antenna 5 works in industrial science medical treatment frequency range (Industrial, Scientific, Medical, ISM) 2,400,000,000 hertz of (2.4GHz) frequency ranges, as the monopole antenna that stands on 1/4 wavelength (λ) on the circuit board (PCB), itself and circuit board (PCB) form half-wave dipole, and the E face electric field of this utmost point sub antenna 5, direction coefficient are as follows:

$E_{\mathrm{\&theta;}}=\underset{-1}{\overset{l}{\&Integral;}}d{E}_{\mathrm{\&theta;}}=j\frac{60I_m}{r}\frac{\cos \left(\mathrm{kl}\cos \mathrm{\&theta;}\right)-\cos \mathrm{kl}}{\sin \mathrm{\&theta;}}{e}^{-\mathrm{jkr}}$

$\left|E_{\text{\&theta;}}\right|=\frac{\left|f\left(\mathrm{\&theta;}\right)\right|}{\left|f_{\max }\right|}=\frac{1}{\left|f_{\max }\right|}\left|\frac{\cos (\mathrm{kl}\cos \mathrm{\&theta;}-\cos \mathrm{kl})}{\sin \mathrm{\&theta;}}\right|$

$\left|F\left(\mathrm{\&theta;}\right)\right|=\left|\frac{\cos \left(\frac{\mathrm{\&pi;}}{2}\cos \mathrm{\&theta;}\right)}{\sin \mathrm{\&theta;}}\right|$

Wherein Im is the electric current at equivalent current antinode place, and k is propagation coefficient (Propagation Constant), and l is the equivalent length of monopole.In addition, these utmost point sub antenna 5 ends are connected with a feed side 7, this feed side 7 is to form an equivalent length H (as: 13.5mm) with this utmost point sub antenna 5, and length H will be imitated at these with this utmost point sub antenna 5 in this feed side 7, can be tuned to the resonance band that is different from this helical antenna 4.

In addition, helical antenna 4 relevant for non-homogeneous coiling of the present invention, its can utilize difform first coil partly 5 spiral coils of 40 and second coil partly 42 by tuning two the technical characterictics (as: shape) that have nothing in common with each other with super band, be in U.S.'s " multi-band non-uniform helical antennas " patent of invention (No. the 6112102nd, United States Patent (USP)), detailed description to be arranged, so do not give unnecessary details in addition, in addition, this combined antenna 6 really can be by this helical antenna 4 and this utmost point sub antenna 5, and by tuning three of having nothing in common with each other with super band, and can improve the shortcoming that the known locations part is caused.

The above only is a specific embodiment of the best of the present invention, and structural feature of the present invention is not limited thereto, and anyly is familiar with present technique field person in field of the present invention, can think easily and variation or modification, all can be encompassed in the claim of following this case.

Claims (9)

1, the combined antenna of a kind of multimode and multiband comprises:

One conductive seat;

One helical antenna of non-homogeneous coiling, be located on this conductive seat, this helical antenna has first coil part and second coil part, and this first coil partly partly respectively has physical property parameter inequality with second coil, makes this first coil part and this second coil partly may be tuned to different resonance band respectively;

One utmost point sub antenna is located at the position of this conductive seat in this helical antenna, and this utmost point sub antenna can make this utmost point sub antenna may be tuned to the resonance band that is different from helical antenna by adjusting its physical property parameter.

2, combined antenna as claimed in claim 1 is characterized in that, the physical property parameter of this helical antenna, and the inclination angle, coil diameter, length, the spiral number of turns or the circle that can be the spiral coil of helical antenna are apart from one of them.

3, combined antenna as claimed in claim 1 is characterized in that, the physical property parameter of this utmost point sub antenna, can be the length of antenna or line footpath one of them.

4, combined antenna as claimed in claim 1, it is characterized in that, this first coil of this helical antenna inclination angle partly, less than this second coil inclination angle partly, make this first coil circle distance partly, also little than this second coil circle distance partly, and first coil of this helical antenna part and second coil part, make between each helical coil of this helical antenna apart from becoming upper tightly lower sparse shape.

5, combined antenna as claimed in claim 4, it is characterized in that, the fundamental characteristics of this helical antenna is decided by the ratio of screw diameter D and wavelength X, and the average diameter that D is a spiral is established in D/ λ＜1.8 of two wave bands, S is a pitch, h is an axial length, and l is the average length of every circle, and θ is a helical angle, N is the number of turns, and then an electric field and the direction coefficient of this helical antenna are as follows:

$\left.\begin{array}{c}{l}^2=S^2+{\left(\mathrm{\&pi;D}\right)}^2={\left(\frac{S}{\mathrm{Sin\&theta;}}\right)}^2\\ h=\mathrm{NS}\end{array}\right\}$

$E_{\mathrm{\&theta;}}=j\frac{60\mathrm{\&pi;I}}{r}\frac{S}{\mathrm{\&lambda;}}\mathrm{Sin\&theta;}$

6, combined antenna as claimed in claim 4, it is characterized in that, this helical antenna is formed first synthesis unit by first coil each spiral coil and second coil each spiral coil partly partly, first coil partly and the circle of second coil each spiral coil partly apart from then forming second synthesis unit, this helical antenna system utilizes this first synthesis unit and second synthesis unit to be transferred to two different frequency ranges by humorous.

7, combined antenna as claimed in claim 6 is characterized in that, this helical antenna partly has 5 spiral coils by first coil, and this second coil partly has 4 spiral coils.

8, combined antenna as claimed in claim 1, it is characterized in that, this utmost point sub antenna is as the monopole antenna that stands on 1/4 wavelength (λ) on the circuit board, and itself and circuit board form half-wave dipole, and an electric field of this utmost point sub antenna, direction coefficient are as follows:

$E_{\mathrm{\&theta;}}=\underset{-\mathrm{l}}{\overset{\mathrm{l}}{\&Integral;}}d{E}_{\mathrm{\&theta;}}=j\frac{{60I}_m}{r}\frac{\cos \left(\mathrm{kl}\cos \mathrm{\&theta;}\right)-\cos \mathrm{kl}}{\sin \mathrm{\&theta;}}{e}^{-\mathrm{jkr}}$

$\left|E_{\mathrm{\&theta;}}\right|=\frac{\left|f\right|\left(\mathrm{\&theta;}\right)}{\left|f_{\max }\right|}=\frac{1}{\left|f_{\max }\right|}\left|\frac{\cos (\mathrm{kl}\cos \mathrm{\&theta;}-\mathrm{coskl})}{\sin \mathrm{\&theta;}}\right|$

$\left|F\right(\mathrm{\&theta;}\left)\right|=\left|\frac{\cos \left(\frac{\mathrm{\&pi;}}{2}\cos \mathrm{\&theta;}\right)}{\sin \mathrm{\&theta;}}\right|$

Wherein Im is the electric current at equivalent current antinode place, and k is a propagation coefficient, and l is the equivalent length of monopole.

9, combined antenna as claimed in claim 1, it is characterized in that, the terminal system of this utmost point sub antenna is connected with a feed side, this feed side and this utmost point sub antenna form an equivalent length, this feed side and this utmost point sub antenna will be imitated length at these, can be tuned to the resonance band that is different from this helical antenna.

Images