CN100382390C - dual frequency antenna - Google Patents

Abstract

The present invention provides a dual-band antenna, which has a radiation element, a ground element spaced at one side of the radiation element, a conductive pin crossing the radiation element and the ground element, and a signal line for transmitting and receiving signals, and is characterized in that: the conductive pin is in an N shape and the signal line is connected to the conductive pin, so that the single conductive pin is used for providing the functions of grounding and signal feeding.

Description

dual frequency antenna

technical field

The invention relates to a dual-frequency antenna, in particular to an inverted-F antenna in which a signal feeding point and a grounding point share a single conductive pin.

Background technique

Due to the wireless communication technology that uses electromagnetic waves to transmit signals, there is no need to connect cables to achieve the effect of communicating with remote devices, and it has the advantage of being easy to move, making the use of wireless communication technology There are more and more types of products, such as mobile Phones, laptops, smart home appliances that provide wireless communication capabilities, and more. Since the aforementioned devices use electromagnetic waves to transmit signals, antennas for inducing electromagnetic waves are necessary devices in devices applying wireless communication technology. At present, the antenna can be roughly divided into the antenna exposed outside the device and the antenna built in the device. Since the exposed antenna will affect the overall appearance of the device and have the disadvantages of being easily bent and broken by collisions with foreign objects, the built-in Antennas have become the future trend.

As shown in FIG. 1 , it is a traditional built-in antenna 1 . The antenna 1 is a planar inverted-F antenna (Planar Inverted-F Antenna, PIFA), which roughly has a rectangular plate-shaped radiating element 11 and a spaced relative to the floor-shaped grounding element 12, and the radiating element 11 further extends downwards with two conductive pins. 13, 14, one of the conductive pins 13 is electrically connected to the ground element 12 as a ground pin, and the other conductive pin 14 passes through the ground element 12 and is suitable for being electrically connected to a radio transceiver circuit (not shown in the figure) Feed the signal to the pin. In this way, when the signal feed-in pin 14 feeds the current into the radiation element 11, the current will be divided into left and right paths and flow through the ground pin 13 to the ground element 12, and two electromagnetic waves of different frequencies will be emitted due to the difference in the length of the two current paths. (L=λ/4, L=path length, λ=wavelength); Conversely, when the radiation element 11 induces electromagnetic waves consistent with the two frequencies and the current path length, the signal can be introduced into the wireless transceiver through the signal feed pin 14 circuit. Therefore, the flat inverted-F antenna 1 can send and receive electromagnetic waves of two different frequencies.

In addition, the shape of the radiation element 11 of the inverted-F antenna is not only a flat plate, but also a line. As shown in Fig. 2, it is another traditional inverted-F antenna 1'. Similarly, the antenna 1' has a strip-shaped radiating element 11', a plate-shaped grounding element 12' spaced opposite to the radiating element 11', and two conductive pins 13', 14' between them. The conductive pin 13' connects one end of the radiating element 11' to the grounding element 12' to serve as a grounding pin. Another conductive pin 14' is arranged in the middle between the two ends of the radiating element 11', that is, the two ends of the non-radiating element 11', so as to be connected to the radio transceiver circuit (not shown) via the signal line 15', Feed the pin as a signal. Here, when the signal feed-in pin 14' is fed with current by the signal line 15', the current will also flow in left and right directions. However, as shown in Figure 3, the current flows directly from the signal feed-in pin 14' to the ground pin 13 ', because the currents of the two pins 14' and 13' flow in opposite directions, the currents in the left path will cancel each other out, instead of resonating and emitting electromagnetic waves. As for the length L of the right path, it can be equivalent to the length of the part on the right side of the signal feed pin 14 ′ in the radiating element 11 ′, which is also approximately equal to a quarter wavelength, and can emit a specific frequency (f=c/ λ, c=3×10 ⁸ m/sec) electromagnetic waves can also induce electromagnetic waves of this frequency and induce signals into the wireless transceiver circuit through the signal feed pin 14' and the signal line 15'. Therefore, unlike the planar inverted-F antenna 1 which can transmit and receive electromagnetic waves of two frequencies, the linear inverted-F antenna 1 ′ can only transmit and receive electromagnetic waves of a single frequency.

Therefore, whether it is a flat inverted-F antenna 1 or a linear inverted-F antenna 1', two independent conductive pins 13, 13', 14, 14' are respectively used as grounding pins 13, 13' and grounding pins 13, 13' and The signal is fed into the pins 14, 14', resulting in a large number of components, and because it is a linear pin located between the radiating elements 11, 11' and the grounding elements 12, 12', its size and arrangement position are relatively fixed. It is difficult to adjust the input and output impedance of the antenna according to design requirements (the characteristic parameters of the antenna include frequency, frequency band and input and output impedance).

Furthermore, most of today's wireless communications used in various fields are still in the period of coexistence of many standards. For example, in Wireless Local Area Network (WLAN), the current standard has been established by Institute of Electrical and Electronic Engineer, IEEE) developed IEEE802.11b, IEEE802.11a and so on. Depending on the standard, the corresponding frequency may also be different. For example, IEEE802.11a and IEEE802.11b define the frequency bands of 5.5GHz (the frequency band is about 5.15-5.85GHz) and 2.45GHz (the frequency band is about 2.412-2.4835GHz) respectively. . At the time of design, in order to meet more standards to improve product compatibility, most of the current dual-frequency antennas that can transmit and receive two frequencies are used, which makes the linear inverted F-type antenna 1' insufficient (because it is a single-frequency antenna) ). If the linear inverted-F antenna 1' can also transmit and receive two frequencies, the applicable range of the linear inverted-F antenna 1' can be increased. If as shown in Figure 4, the setting position of the grounding pin 13" of the linear inverted F-type antenna 1" is directly changed so that it is no longer located at the end of the radiating element 11" and the effect of mutual cancellation of currents can be avoided. During the process that the end 111 ″ of the radiating element 11 ″ adjacent to the ground pin 13 ″ flows to the signal feed pin 14 ″ due to the induction of a specific frequency electromagnetic wave, the ground pin 13 ″ is compared with the signal feed pin 14 ″. The pin 14" is closer to the end 111", so that the signal will be directly introduced into the ground element 12" through the ground pin 13", so that the signal feeding pin 14" still cannot receive the signal generated by the end 111, so if the ground point ( The ground pin 13 ") is ahead of the signal feed point (signal feed pin 14"), and this end 111" still cannot effectively provide another frequency for sending and receiving. Therefore, if the two conductive pins 13 ", 14 " are maintained Playing the roles of grounding and signal feeding respectively, it is difficult to avoid the situation that the grounding point is ahead of the signal feeding point in the signal transmission path of one end 111 ″ of the radiating element 11 ″, so that the linear inverted-F antenna 1 ″ is still only It can provide a single frequency but cannot effectively provide dual frequency.

Therefore, the inventor considers that if a single conductive pin can be used to provide the functions of signal feeding and grounding and the signal feeding point is ahead of the grounding point, the left path in the traditional inverted-F antenna 1′ will be eliminated due to grounding. The pin 13' and the signal feed pin 14' are juxtaposed so that the currents cancel each other out, and compared with any kind of inverted F antenna, the number of components can be simplified, and the size or signal of this pin can be adjusted. Adjust the input and output impedance of the antenna to solve the traditional problem.

Contents of the invention

Therefore, an object of the present invention is to provide a dual-band antenna that can reduce the number of pins.

Another object of the present invention is to provide an inverted-F antenna with simplified components.

Another object of the present invention is to provide a linear inverted-F antenna capable of transmitting and receiving dual frequencies.

Therefore, a dual-frequency antenna of the present invention, which can be electrically connected to a circuit used by a radio transceiver, includes a radiating element, a grounding element spaced apart from one side of the radiating element, and a conductive pin and a signal line; wherein, the conductive pin has a first branch, one end of which is connected to the radiation element, a second branch, which is spaced from the first branch and one end of which is connected to the grounding element, and a third A branch is connected across the first and second branches; and one end of the signal line is connected to the conductive pin, and the other end is electrically connected to the circuit used by the radio transceiver device.

Description of drawings

Other technical contents, features and advantages of the present invention will be clearly presented in the following detailed description of preferred embodiments with reference to the accompanying drawings, in the accompanying drawings:

FIG. 1 is a schematic diagram of a traditional planar inverted-F antenna.

FIG. 2 is a schematic diagram of a conventional linear inverted-F antenna.

FIG. 3 is a schematic diagram of an equivalent circuit of a current left path of the antenna in FIG. 2 .

FIG. 4 is a schematic diagram of a variation of the linear inverted-F antenna of FIG. 2 .

Fig. 5 is a schematic diagram of a first preferred embodiment of the dual-frequency antenna of the present invention, and the dual-frequency antenna of this embodiment is a schematic diagram of a linear inverted-F antenna.

FIG. 6 is a schematic diagram of the antenna of FIG. 5 at a first frequency.

FIG. 7 is a schematic diagram of the antenna of FIG. 5 at a second frequency.

FIG. 8 is a test result diagram of a voltage standing wave ratio (Voltage Standing Wave Ratio, VSWR) of an example of the antenna of FIG. 5 .

FIG. 9 is a schematic diagram of the antenna of FIG. 5 assembled in a liquid crystal display.

Fig. 10 is a schematic diagram of a second preferred embodiment of the dual-frequency antenna of the present invention, and the dual-frequency antenna of this embodiment is a planar inverted-F antenna.

Component designation comparison

2, 2' antenna 3, 3' radiating element

31 The first section 32 The second section

33 input points 4, 4' grounding element

5, 5' conductive pin 51, 51' the first

511, 512 end of the first branch

52, 52' the second branch 521, 521' the end of the second branch

53, 53' the third branch 531 first end

The second end of 532 at the turning point of 54 and 55

6, 6' signal line 61, 61' multi-core wire (core wire)

62, 62′ ground plane 7 laptop

71 liquid crystal display

Detailed ways

It should be noted that in the following embodiments, the same or similar reference numerals represent the same or similar elements. Furthermore, the frequency of a general antenna is related to the size of the radiating element used in the antenna, while the frequency band is related to the size of the grounding element used in the antenna, and the input and output impedance is related to the distance between the signal feeding point and the grounding element, In addition, when any one of frequency, frequency band, and input and output impedance changes, it will affect the other two, so that the adjustment of the three influences each other.

The invention improves the inverted F-type antenna, makes the signal feed and the ground share a single pin, simplifies the structure of the antenna, and further solves the traditional problem. At first, as Fig. 5, be the first preferred embodiment of the dual frequency antenna of the present invention, this embodiment is the linear inverted F type antenna 2 and comprises a radiating element 3, a grounding element 4, a conductive pin 5 and a Signal line 6.

The radiating element 3 is a straight wire made of conductive wires for sending and receiving two different frequencies f ₁ and f ₂ . The length of the radiating element 3 can be divided into a first section 31 resonant at a first frequency _f1 and a second section ₃₂ resonant at a second frequency f2 depending on two different frequencies, the first frequency f ₁ is different from the second frequency f ₂ . Specifically, the length l ₁ of the first section 31 is approximately equal to a quarter of the wavelength λ ₁ of the first frequency f ₁ [l ₁ =λ ₁ /4=c/(4f ₁ ), c=3×10 ⁸ m/sec], and the length l ₂ of the second section 32 is approximately equal to a quarter of the wavelength λ ₂ of the second frequency f ₂ [l ₂ =λ ₂ /4=c/(4f ₂ ), c= 3×10 ⁸ m/sec], so the total length L of the radiation element 3 is approximately equal to the sum of the quarter wavelengths λ ₁ and λ ₂ of the two frequencies f ₁ and f ₂ (L=l ₁ +l ₂ ) .

The ground element 4 is a conductive piece located below the radiation element 2 at intervals. The size of the ground element 4 is related to the frequency bandwidth of the antenna 2 . Specifically, as the grounding effective area changes, the impedance and bandwidth of the antenna 2 also change accordingly. For example, if the first frequency f ₁ is assumed to comply with the IEEE802.11a standard, the first frequency f ₁ can be It is 5.5 GHz and its preset bandwidth can be 5.15-5.85 GHz; if the second frequency f ₂ complies with the 802.11b standard, then the second frequency f ₂ can be 2.45 GHz and its bandwidth can be 2.412-2.4835 GHz.

The conductive pin 5 in this example is located between the radiation element 3 and the ground element 4 and has a first branch 51 , a second branch 52 and a third branch 53 . One end 51 of the first branch 51 is connected to the input point 33, the input point 33 is located between the two sections 31, 32 in the radiating element 3, and the other end 52 extends along the direction of the radiating element 3 toward the grounding element 4 and is not connected to the grounding element 4. The ground element 4 contacts. One end 521 of the second branch 52 is connected to the ground element 4 and the other end 522 extends along the direction of the ground element 4 toward the radiation element 3 without touching the radiation element 3 , and the second branch 52 is spaced apart from the first branch 51 . The third branch 53 bridges the first branch 51 and the second branch 52, and its first end 531 is connected to the end 512 of the first branch 51 that is not connected to the radiation element 3 and the second end 532 is connected to the second branch 52. The end 522 not in contact with the grounding element 4 causes the conductive pin 5 to present an N-shape. In this embodiment, the first branch 51 and the second branch 52 are respectively perpendicular to the radiating element 3 and the grounding element 4, so that they are parallel to each other, and the two ends 531, 532 of the third branch 53 are respectively perpendicular to the The first branch 51 is connected to the second branch 52, so that two vertical turning points 54, 55 are formed on the conductive pin 5. One turning point 54 is located at the junction of the first branch 51 and the third branch 53 and the other The turning point 55 is located at the junction of the second branch 52 and the third branch 53 . It should be noted that although this embodiment defines the conductive pin 5 in detail for the purpose of illustration, those in the industry should know that the shape and turning angle of the conductive pin 5 can be adjusted according to actual design requirements, and only need to meet the requirements of the radiating element 3 The condition that resonance with the ground element 4 can be generated is sufficient.

One end 61 of the signal line 6 is connected to the conductive pin 5, and the other end is electrically connected to the radio transceiver circuit (not shown in the figure) used by the radio transceiver device, so that the radio transceiver circuit can be electrically connected to the radiation element 3, so as to The radiation element 3 is used to receive or transmit electromagnetic waves. In this embodiment, the signal line 6 can be a coaxial cable, which generally includes a multi-core wire 61, an insulating layer covering the multi-core wire 61, a grounding layer 62 covering the insulating layer and made of conductive material, and An insulating coat covering the ground layer 62 is used to electrically connect the radiation element 3 and the radio transceiver circuit with the multi-core wire 61 , and to electrically connect the ground layer 62 to the ground element 4 .

In this embodiment, the multi-core wire 61 of the signal line 6 is connected to the third branch 53 of the conductive pin 5, preferably at the turning point 54 between the first branch 51 and the third branch 53. That is, the turning point 54 is used as the signal feeding point. In this way, because the conductive pin 5 is connected to the radiating element 3 and the grounding element 4, it can act as a grounding pin, and because the signal line 6 is connected to the conductive pin 5, the signal line 6 can feed the signal through the conductive pin 5. Into the radiating element 3 or from the radiating element 3 to receive the resonant signal, and can play the function of the signal feeding pin, so that the single conductive pin 5 has both the signal feeding and grounding functions, which is obviously different from the traditional use of two conductive pins. The pin acts as a signal feed and ground function.

Furthermore, because the signal line 6 is connected to the turning point 54 of the conductive pin 5, when the signal is sent from the radio transceiver circuit and fed into the conductive pin 5 through the signal line 6, the signal will be shunted to the first branch 51. and the third branch 53, and when part of the signal fed into the third branch 53 flows to the turning point 55 between the third branch 53 and the second branch 52, because of the obstruction of the vertical turning point 55, part of the signal will change its flow direction. The third branch 53 is reflowed to be fed into the radiation element 3 through the first branch 51, and part of the signal flowing to the first branch 51 will be smoothly fed into the radiation element 3, so that most of the signals will be fed into the radiation element 3 to generate resonate to emit electromagnetic waves. When the radiating element 3 induces electromagnetic waves to generate a signal, because the signal line 6 is connected to the turning point 54 of the conductive pin 5, before the signal is fed into the grounding element 4, most of the signal will be received by the signal line 6 and transmitted to the radio. On the contrary, when the radiation element 3 induces electromagnetic waves to generate a signal, the signal flows to the conductive pin 5, because the signal feed-in point (that is, the junction of the signal line 6 and the conductive pin 5) is ahead of the ground point ( That is, the conductive pin 5 is connected to the ground element 4), so the signal will be fed into the signal line 6 first. In addition, since the signal line 6 in this example is set along the direction of the first branch 51 to be consistent with the signal flow direction, the signal wants to Feeding into the ground element 4 requires two turns, so that most of the signal will be fed into the signal line 6 . Therefore, the turning design of the conductive pin 5 enables it to provide the functions of grounding and signal feed-in.

In this way, the traditional linear inverted-F antenna has the problem of being unable to generate resonance because the ground pin and the signal feed pin are parallel and located at one end of the radiation element, so that the currents flowing through this end cancel each other out, because this embodiment uses Connected to the conductive pin 5 of the input point 33 to provide a grounding function, rather than at the end, and the signal feed point (ie, the turning point 54) is ahead of the ground point (ie, the end 521 of the second branch 52), causing the induction signal It will first flow into the signal line 6 through the signal feeding point (that is, the turning point 54) and be received by the radio transceiver circuit, so that the two sections 31, 32 of the radiating element 3 can both send out or receive radio waves of a specific frequency. In detail, as shown in Figure 6, when the antenna 2 induces the electromagnetic wave of the first frequency _f1 , the first section 31 of the radiation element 3 will resonate because the length matches the first frequency _f1 and generate an induction signal through the first branch 51 is fed into the signal line 6; similarly, as shown in Figure 7, when the antenna 2 induces the second frequency _f2 , the second section 32 will resonate to generate an induction signal to be fed into through the first branch 51 of the conductive pin 5 Signal line 6. In this way, the design of the common conduction pin of the signal feeding point and the grounding point of the present invention is used to achieve the purpose of the invention of dual frequency transmission and reception.

Furthermore, in order to prove that the structure of this embodiment can indeed transmit and receive antennas with two different frequencies. An example is given for testing according to this embodiment. In this example, the radiating element 3 can send and receive electromagnetic waves conforming to the standards of IEEE802.11a and IEEE802.11b, and it is assumed that the length _l1 of the first section 31 of the radiating element 3 is 6 mm (10 ⁻³ m), and the second section 32 is the length l ₂ is 22mm, the length of the first branch 51 of the conductive pin 5 is 2mm, the length of the second branch 52 is 3mm, the length of the third branch 53 is 9mm, and the size of the grounding element 4 is 20mm× 40mm. Generally, as the voltage standing wave ratio (Voltage Standing Wave Ratio, VSWR) value increases, the signal reflection will become more serious and affect the operation of the antenna. Therefore, the antenna standard generally defines the maximum allowable value of the voltage standing wave ratio. The maximum allowable value may vary with different standards. If the VSWR of this frequency is lower than the maximum allowable value, it can only be confirmed that the antenna can operate at this frequency. Therefore, this experiment uses the measurement of the voltage standing wave ratio of the antenna 2 in this example at each frequency between 2GHz and 6GHz. The result is shown in Figure 8, in order to know the operable frequency range of the antenna 2, and according to IEEE802.11b and IEEE802. The frequency band requirements in the 11a standard, the results of extracting the corresponding frequency points in Figure 8 are listed in Table 1 and Table 2 below.

Table 1

Frequency (GHz) 2.4 2.45 2.5 VSWR 1.59 1.26 1.102

Generally, IEEE 802.11b requires that the VSWR is less than 2, and with reference to Figure 8 and the above list 1, when the frequency of antenna 2 is 2.4GHz, the VSWR is 1.59 (as shown in Node 1 in Figure 8), and the frequency is At 2.45GHz, the VSWR is 1.26 (as shown in node 2 in Figure 8) and when the frequency is 2.5GHz, the VSWR is 1.102 (as shown in Figure 8, node 3), so it can be seen that the antenna 2 of this example can be at least Operate within the frequency range of 2.4-2.5GHz to meet the frequency band requirements (2.412-2.4835GHz) in the IEEE802.11b standard.

Table 2

Frequency (GHz) 5.15 5.25 5.35 5.47 5.825 VSWR 1.481 1.564 1.323 1.192 1.769

As shown in Table 2 above, when the frequency of antenna 2 is 5.15 GHz, the voltage standing wave ratio is 1.481 (as shown in node 4 in Figure 8), and when the frequency is 5.25 GHz, the voltage standing wave ratio is 1.564 (as shown in Figure 8, node 5), When the frequency is 5.35GHz, the VSWR is 1.323 (as shown in node 6 in Figure 8), when the frequency is 5.47GHz, the VSWR is 1.192 (as shown in Figure 8, node 7) and when the frequency is 5.825GHz, the VSWR The ratio is 1.769 (as node 8 in FIG. 8 ), so the antenna 2 in this example can also operate in the range of 5.15-5.825 GHz to meet the frequency band requirement (5.15-5.85 GHz) in the IEEE802.11a standard.

According to the aforementioned experimental results, it is proved that the structure of this example can indeed provide a dual-band antenna conforming to IEEE802.11a and IEEE802.11b standards, which further proves that the signal feeding point and the grounding point in this embodiment can indeed share the same conductive pin 5 . Therefore, in this embodiment, a single conductive pin 5 is used to take into account both signal feeding and grounding functions, so as to solve the regret that the traditional linear F-type antenna cannot transmit and receive two frequencies. The reduction in number makes this embodiment indeed achieve the effect of reducing the number of components and simplifying the structure.

In addition, in order to reduce the thickness of the antenna 2 and facilitate assembly, the antenna 2 can be made of a flexible printed circuit (FPC; or soft printed circuit) material to reduce the thickness of the antenna 2 and effectively reduce the overall height of the antenna. effect. Moreover, due to the flexibility of the material, the antenna 2 is convenient to be embedded in the limited space of the electronic device. For example, as shown in FIG. 9, when the antenna 2 is assembled in the notebook computer 7, it can be embedded in the frame of the liquid crystal display 71. Moreover, the grounding element 4 can be attached to the back plate of the liquid crystal display 71 , so that the area of the grounding element 4 is less limited, so as to achieve more flexible assembly. In addition, the grounding element 4 of the antenna 2 can also be connected to existing metal components in the electronic device to expand the grounding area, thereby increasing the operating bandwidth of the antenna 2, and further facilitating adjustment of frequency and input and output impedance.

Furthermore, it should be noted that although the signal line 6 is connected to the turning point of the conductive pin 5 in this embodiment, those in the industry should know that the connection position of the signal line 6 can be changed according to actual design needs, for example, it can be changed in the third The movement on the support 53 should not be limited to the description of this embodiment; and since the signal feed pin and the radiation element are not integrally formed in the traditional antenna, the position of the signal feed point is fixed and difficult to change. However, in this embodiment, the signal line 6 is externally connected to the conductive pin 5, so that the position of the signal feed-in point can be adjusted according to demand after assembly, so as to utilize the change of the signal feed-in point (that is, the signal line 6 is connected to the conductive pin 5) and the grounding point (that is, the connection between the conductive pin 5 and the grounding element 4) to adjust the resonant frequency of the antenna 2, and because the resonant frequency, frequency band and input and output impedance of the antenna 2 affect each other, making You can also adjust the frequency band or input and output impedance.

In addition, the concept of the single conductive pin of the present invention can also be applied to other types of inverted-F antennas, such as the planar inverted-F antenna of the second embodiment of the present invention described below. As shown in Fig. 10, the antenna 2' is a planar inverted-F antenna and has a radiation element 3', a ground element 4', a conductive pin 5' and a signal line 6' the same as the previous embodiment. The difference between this embodiment and the previous embodiments is that the radiation element 3' is a conductive sheet, and a rectangular groove 32' is recessed on one side 31' of the radiation element 3' to increase the length of the current path and further miniaturize the radiation element The dimensions of 2' and the components 4', 5' and 6' are the same as those of the previous embodiments and will not be repeated here. In this embodiment, since the multi-core wire 61' of the signal line 6' is connected to the conductive pin 5' and the conductive pin 5 bridges the radiation element 3' and the ground element 4', the conductive pin 5' is connected to the aforementioned The same embodiments can provide the functions of signal feed-in and grounding, thereby achieving the effect of simplifying the structure.

The above is only a preferred embodiment of the present invention, and the scope of the present invention can not be limited with this, that is, all simple equivalent changes and modifications made according to the claims of the present invention and the contents of the description should still belong to the present invention. within the scope of invention patents.

Claims (15)

1. dual-band antenna, this antenna can produce with the employed circuit of a radio receiver-transmitter and be electrically connected, and comprises:

One radiant element has first frequency section and second frequency section, and an input point is between this first frequency section and second frequency section, as the usefulness of signal output input;

One earth element is the side that the compartment of terrain is positioned at this radiant element;

One conductive connecting pin, has one first, the one end connects this input point and the other end does not contact with earth element, radiant element, one second be with this first separately and the one end is connected this earth element and the other end does not contact with earth element, radiant element, and one the 3rd be cross-over connection in this first and second, a turning point be positioned at first with the 3rd joint and another turning point be positioned at second with the 3rd joint; And

One signal line, an end are to be connected in this conductive connecting pin, and the other end then produces with the employed circuit of this radio receiver-transmitter and is electrically connected.

2. dual-band antenna as claimed in claim 1, wherein, this signal line is to be connected in the 3rd of this conductive connecting pin.

3. dual-band antenna as claimed in claim 1 or 2, wherein, this signal line be connected in first of this conductive connecting pin with the 3rd joining place.

4. dual-band antenna as claimed in claim 1, wherein, the 3rd is to be connected in this first and second free end.

5. dual-band antenna as claimed in claim 4, wherein, the 3rd of this conductive connecting pin is vertical this first.

6. dual-band antenna as claimed in claim 1, wherein, the 3rd of this conductive connecting pin is vertical this second.

7. dual-band antenna as claimed in claim 1, wherein, this radiant element is to be parallel to this earth element.

8. dual-band antenna as claimed in claim 1, wherein, first of this conductive connecting pin is to be parallel to each other with second.

9. dual-band antenna as claimed in claim 8, wherein, this first and second be vertically to be connected in this radiant element and this earth element respectively.

10. dual-band antenna as claimed in claim 1, wherein, this earth element is a lamellar body.

11. dual-band antenna as claimed in claim 10, wherein, this radiant element is a straight line.

12. dual-band antenna as claimed in claim 10, wherein, this radiant element is a lamellar body, to form dull and stereotyped inverted F shaped antenna.

13. dual-band antenna as claimed in claim 12, wherein, an example of this radiant element is arranged with a groove.

14. dual-band antenna as claimed in claim 1, wherein, this signal line is a coaxial cable and has a cable and electrical isolation ground coats this cable and is the ground plane of conductive material, and this cable is to be electrically connected this radiant element and the employed circuit of this wireless transmitter, and this ground plane is to be electrically connected this earth element.

15. as any described dual-band antenna in claim 1-2 and 4-11 and 14, wherein, described dual-band antenna is dull and stereotyped reversed F-typed dual-band antenna.

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