TWI617096B - Cognitive radio antennas - Google Patents

Abstract

A sensing radio antenna includes: a substrate having a first surface and a second surface; a sensing antenna disposed on the first surface, the sensing antenna having a sensing line segment and a a tunable antenna, the tunable antenna is disposed on the first surface, the tunable antenna has a feeding line segment, an adjusting line segment, a first radiant segment, a second radiant segment, and a third a radiation line segment, a first diode and a second diode; and a ground layer disposed on the second surface, thereby improving spectrum resource use efficiency.

Description

Perceptual radio antenna

The present invention relates to a perceptual radio antenna, and more particularly to a perceptual radio antenna having both radio frequency sensing and system reset.

Different communication systems can perform transmission operations in different communication bands. Among the limited spectrum resources, the currently used communication bands are between 0 GHz and 6 GHz. According to the survey, in the communication band of 0 GHz to 6 GHz, the usage rate of 0 GHz to 1 GHz is the highest, the usage rate of 1 GHz to 2 GHz is second, and the usage rate of 3 GHz to 6 GHz is the lowest. Thus, the problem of uneven use of spectrum resources already exists. A lot of time.

In order to effectively improve the efficiency of spectrum use, Cognitive Radio (CR) technology, which can operate in different frequency bands, is expected to become the mainstream of communication technology in the future. Devices suitable for cognitive radio technology must have the capability of RF sensing and Reconfigurability, which can detect idle or suitable frequency bands and then pass the selected frequency band. System reset capability adjusts its own relevant transmission parameters (including operating frequency, bandwidth, radiated power, etc.). However, conventional antennas usually do not have both radio frequency sensing capability and system reset capability, and are not suitable for cognitive radio technology. Under the condition of the antenna, the problem of poor use of spectrum resources cannot be effectively solved.

In view of this, the present invention provides a cognitive radio antenna to solve the problem of inefficient use of spectrum resources due to the lack of a suitable antenna.

The object of the present invention is to provide a cognitive radio antenna, the cognitive radio day The line can effectively detect the applicable frequency band and the switching operation frequency, and has the effect of improving the efficiency of using spectrum resources.

"Coupling" as used throughout this disclosure refers to the manner in which energy is transferred from one medium to another.

In order to achieve the foregoing object, the cognitive radio antenna of the present invention comprises: a substrate having a first surface and a second surface; a sensing antenna, the sensing antenna being disposed on the first surface, the sensing The antenna has a sensing line segment and a circular segment, and the sensing line segment and the circular segment are sequentially connected along a first direction; an adjustable antenna, the adjustable antenna is disposed on the first surface, The adjustable antenna has a feed line segment, an adjustment line segment, a first radiation segment, a second radiation segment, a third radiation segment, a first diode and a second diode, and the feed segment and The adjustment line segment extends along the first direction, the first radiation line segment, the second radiation line segment and the third radiation line segment extend along a second direction, and the second direction is perpendicular to the first direction, the feed line The segment, the first diode, and the adjustment segment are sequentially connected along the first direction, and the first radiation segment, the second diode, and the adjustment segment are sequentially connected along the second direction, the first a second radiating line segment connecting the feeding line segment, the third The ray segment is located between the first radiant segment and the second radiant segment and is connected to the adjustment segment, and in the second direction, the distance from the adjustment segment to the sensing antenna is greater than the first radiant segment to the sense Measuring a distance of the antenna; and a ground layer disposed on the second surface, the ground layer partially covering the sensing line segment and the feeding line in a vertical projection direction of the second surface toward the first surface segment. Thereby, the sensing radio antenna of the present invention can achieve the functions of radio frequency sensing and system resetting through the sensing antenna and the tunable antenna, and can effectively detect the applicable frequency band and the switching operation frequency in the cognitive radio system, and has the improvement The efficiency of the use of spectrum resources.

Wherein, in the second direction, the length of the first radiation segment is greater than the length of the second radiation segment. Thereby, the tunable antenna can achieve the function of system reset, and can effectively switch the operating frequency in the cognitive radio system, and has the effect of improving the efficiency of using spectrum resources.

Wherein, in the second direction, the length of the third radiation segment is greater than the length of the second radiation segment and less than the length of the first radiation segment. Thereby, the tunable antenna can achieve the function of system reset, and can effectively switch the operating frequency in the cognitive radio system, and has the effect of improving the efficiency of using spectrum resources.

The tunable antenna further has a first connecting line segment and a second connecting line segment, the first connecting line segment extending along the first direction, the second connecting line segment extending along the second direction, and the second radiating line segment The first connecting line segment, the second connecting line segment and the feeding line segment are sequentially connected along the second direction. Thereby, the tunable antenna can achieve the function of system reset, and can effectively switch the operating frequency in the cognitive radio system, and has the effect of improving the efficiency of using spectrum resources.

Wherein, in the first direction, the length of the feeding line segment is greater than the length of the adjusting line segment. Thereby, the tunable antenna can achieve the function of system reset, and can effectively switch the operating frequency in the cognitive radio system, and has the effect of improving the efficiency of using spectrum resources.

The first diode and the second diode are both variable capacitance diodes. Thereby, the tunable antenna can achieve the function of system reset, and can effectively switch the operating frequency in the cognitive radio system, and has the effect of improving the efficiency of using spectrum resources.

The circular section of the sensing antenna has a slot segment extending along the second direction. Thereby, the sensing antenna can achieve the function of radio frequency sensing, and can effectively detect the applicable frequency band in the cognitive radio system, and has the effect of improving the efficiency of using spectrum resources.

The sensing line segment of the sensing antenna has a first sensing feeder segment, a second sensing feeder segment and a third sensing feeder segment, the first sensing feeder segment and the second sensing feeder segment. The segment and the third sensing feeder segment are sequentially connected along the first direction, and in the first direction, the length of the first sensing feeder segment is smaller than the length of the second sensing feeder segment, the second The length of the sensing feeder segment is smaller than the third sensing feeder segment; and, in the second direction, the width of the first sensing feeder segment is greater than the width of the second sensing feeder segment, the second sensing feeder The width of the segment is greater than the The third senses the width of the feeder segment. Thereby, the sensing antenna can achieve the function of radio frequency sensing, and can effectively detect the applicable frequency band in the cognitive radio system, and has the effect of improving the efficiency of using spectrum resources.

The auxiliary adjustable antenna is disposed on the first surface, and the sensing antenna is located between the adjustable antenna and the auxiliary adjustable antenna on the first surface, the auxiliary The adjustable antenna has an auxiliary feeding line segment, an auxiliary adjusting line segment, a first auxiliary radiation segment, a second auxiliary radiation segment, a third auxiliary radiation segment, a first auxiliary diode and a second auxiliary diode The auxiliary feeding line segment and the auxiliary adjusting line segment extend along the first direction, and the first auxiliary radiation segment, the second auxiliary radiation segment and the third auxiliary radiation segment extend along the second direction, the auxiliary The feeding line segment, the first auxiliary diode and the auxiliary adjusting line segment are sequentially connected along the first direction, and the auxiliary adjusting line segment, the second auxiliary diode and the first auxiliary radiating line segment are along the second The second auxiliary radiation line segment is connected to the auxiliary feed line segment, and the third auxiliary radiation line segment is located between the first auxiliary radiation line segment and the second auxiliary radiation line segment and is connected to the auxiliary adjustment line And in the second direction, the auxiliary line to adjust the sensing distance of the antenna larger than the first auxiliary lines radiating from the sensing line to the antenna. Thereby, the auxiliary tunable antenna can achieve the function of system reset, and can effectively switch the operating frequency in the sensible radio system with multiple inputs and multiple outputs, and has the effect of improving the efficiency of using spectrum resources.

The length of the first auxiliary radiation segment is greater than the length of the second auxiliary radiation segment in the second direction. Thereby, the auxiliary tunable antenna can achieve the function of system reset, and can effectively switch the operating frequency in the sensible radio system with multiple inputs and multiple outputs, and has the effect of improving the efficiency of using spectrum resources.

Wherein, in the second direction, the length of the third auxiliary radiation segment is greater than the length of the second auxiliary radiation segment and smaller than the length of the first auxiliary radiation segment. Thereby, the auxiliary adjustable antenna can achieve the function of system reset, and can be in the multi-input and multi-output sensing radio system. Effectively switching the operating frequency in the system has the effect of improving the efficiency of spectrum resource usage.

The tunable antenna further has a first auxiliary connecting line segment and a second auxiliary connecting line segment, the first auxiliary connecting line segment extending along the first direction, the second auxiliary connecting line segment extending along the second direction, and the The auxiliary feed line segment, the second auxiliary connection line segment, the first auxiliary connection line segment and the second auxiliary radiation segment are sequentially connected in the second direction. Thereby, the auxiliary tunable antenna can achieve the function of system reset, and can effectively switch the operating frequency in the sensible radio system with multiple inputs and multiple outputs, and has the effect of improving the efficiency of using spectrum resources.

Wherein, in the first direction, the length of the auxiliary feeding line segment is greater than the length of the auxiliary adjusting line segment. Thereby, the auxiliary tunable antenna can achieve the function of system reset, and can effectively switch the operating frequency in the sensible radio system with multiple inputs and multiple outputs, and has the effect of improving the efficiency of using spectrum resources.

The first auxiliary diode and the second auxiliary diode are both variable capacitance diodes. Thereby, the auxiliary tunable antenna can achieve the function of system reset, and can effectively switch the operating frequency in the sensible radio system with multiple inputs and multiple outputs, and has the effect of improving the efficiency of using spectrum resources.

The ground layer partially covers the auxiliary feed line segment in a vertical projection direction of the second surface toward the first surface. Thereby, the auxiliary tunable antenna can achieve the function of system reset, and can effectively switch the operating frequency in the sensible radio system with multiple inputs and multiple outputs, and has the effect of improving the efficiency of using spectrum resources.

〔this invention〕

1‧‧‧Substrate

11‧‧‧ first surface

12‧‧‧ second surface

2‧‧‧Sensing antenna

21‧‧‧Sensing line segment

211‧‧‧First sensing feeder segment

212‧‧‧Second sensing feeder segment

213‧‧‧ Third sense feeder segment

22‧‧‧Circular section

221‧‧‧Slot

3‧‧‧Adjustable antenna

31‧‧‧Feed in line segments

32‧‧‧Adjust line segments

33‧‧‧First radiation line

34‧‧‧second radiation segment

35‧‧‧ Third radiant section

36‧‧‧First Diode

37‧‧‧second diode

38‧‧‧First connecting line segment

39‧‧‧Second connecting line segment

4‧‧‧ Grounding layer

41‧‧‧Sense missing slot

42‧‧‧Feeding in the slot

43‧‧‧Auxiliary feeding missing slot

5‧‧‧Auxiliary adjustable antenna

51‧‧‧Auxiliary feed line segment

52‧‧‧Assisted adjustment line segment

53‧‧‧First auxiliary radiation segment

54‧‧‧Second auxiliary radiation segment

55‧‧‧ Third auxiliary radiation segment

56‧‧‧First auxiliary diode

57‧‧‧Second auxiliary diode

58‧‧‧First auxiliary connecting line segment

59‧‧‧Second auxiliary connecting line segment

A1‧‧‧ first direction

A2‧‧‧ second direction

L1‧‧‧ first curve

L2‧‧‧ second curve

Fig. 1 is a perspective view showing a perspective structure of a cognitive radio antenna of the present invention.

Figure 2: Top view of the cognitive radio antenna of the present invention.

Fig. 3 is a diagram showing the frequency response of the sensing antenna of the cognitive radio antenna of the present invention.

Figure 4: Frequency of the tunable antenna and the auxiliary tunable antenna of the cognitive radio antenna of the present invention Response graph.

The above and other objects, features and advantages of the present invention will become more <RTIgt; The sensing radio antenna of the present invention comprises a substrate 1, a sensing antenna 2, a tunable antenna 3 and a grounding layer 4. The sensing antenna 2 and the tunable antenna 3 are disposed on a surface of the substrate 1. The ground layer 4 is disposed on the other surface of the substrate 1.

The substrate 1 has a first surface 11 and a second surface 12. The substrate 1 can be a printed circuit board, and the main material of the substrate 1 is not limited herein, such as a fiberglass material.

The sensing antenna 2 is disposed on the first surface 11 , the sensing antenna 2 has a sensing line segment 21 and a circular segment 22 , the sensing line segment 21 extends along a first direction A1 , and the sensing line The segment 21 and the circular segment 22 are sequentially connected in the first direction A1. The sensing antenna 2 can be formed by feeding the microstrip line, and the electrical length can be a quarter wavelength of 2.2 GHz, and has the capability of radio frequency sensing.

The sensing line segment 21 has a first sensing feeder segment 211, a second sensing feeder segment 212, and a third sensing feeder segment 213. The first sensing feeder segment 211 and the second sensing feeder segment The segment 212 and the third sensing feeder segment 213 are sequentially connected along the first direction A1, and the length of the first sensing feeder segment 211 is smaller than the second sensing feeder segment 212 in the first direction A1. The length of the second sensing feeder segment 212 is smaller than the third sensing feeder segment 213; and, in a second direction A2, the width of the first sensing feeder segment 211 is greater than the second sensing feeder The width of the segment 212, the width of the second sensing feeder segment 212 is greater than the width of the third sensing feeder segment 213. The second direction A2 is perpendicular to the first direction A1. With the above arrangement, the sensing antenna 2 can be well matched between 2 GHz and 6 GHz, and the radio frequency sensing can be improved. The effect of ability.

Furthermore, the circular section 22 of the sensing antenna 2 can have a slot section 221 extending along the second direction A2 and adjacent to the circular section 22 and the sensing line segment 21 The connection. By making the extending direction of the slot segment 221 perpendicular to the extending direction of the sensing line segment 21, the sensing antenna 2 can have a good matching between 2 GHz and 6 GHz, and has the effect of improving the radio frequency sensing capability.

The tunable antenna 3 is disposed on the first surface 11. The tunable antenna 3 has a feed line segment 31, an adjustment line segment 32, a first radiant line segment 33, a second radiant line segment 34, and a third radiant line segment 35. a first diode 36 and a second diode 37, the feed line segment 31 and the adjustment line segment 32 extend along the first direction A1, the first radiation segment 33, the second radiation segment 34 and The third radiation line segment 35 extends along the second direction A2. The feed line segment 31, the first diode 36 and the adjustment line segment 32 are sequentially connected along the first direction A1. The first radiation segment 33 is sequentially connected. The second diode 37 and the adjustment line segment 32 are sequentially connected along the second direction A2. The second radiation segment 34 is connected to the feed line segment 31. The third radiation segment 35 is located at the first radiation segment 33. And the second radiation line segment 34 is connected to the adjustment line segment 32, and in the second direction A2, the distance between the adjustment line segment 32 and the sensing antenna 2 is greater than the first radiation line segment 33 to the sensing antenna. 2 distances.

The first diode 36 and the second diode 37 are both variable capacitance diodes. Thereby, through the arrangement of the first diode 36 and the second diode 37, the impedance of the entire adjustable antenna 3 can be changed by using a change in the capacitance value, and the electrical length of the tunable antenna 3 can be adjusted. To achieve the system reset (frequency adjustable) function. Moreover, since the operating bandwidth of the first radiating line segment 33 can cover approximately 1.91 GHz to 3.35 GHz, the operating bandwidth of the second radiating line segment 34 can cover approximately 3.35 GHz to 4.5 GHz, and the operating frequency of the third radiating line segment 35 The width can cover approximately 4.5 GHz to 6.2 GHz. Therefore, the tunable antenna 3 can be between 2 GHz and 6 GHz through the arrangement of the first radiant line segment 33, the second radiant line segment 34, and the third radiant line segment 35. Tune The entire operating frequency has the effect of achieving system reset (frequency adjustable).

Moreover, in the first direction A1, the length of the feed line segment 31 is greater than the length of the adjustment line segment 32; in the second direction A2, the length of the first radiation line segment 33 is greater than the length of the second radiation line segment 34. The length of the third radiation segment 35 is greater than the length of the second radiation segment 34 and less than the length of the first radiation segment 33. Thereby, the tunable antenna 3 can have a good matching between 2 GHz and 6 GHz, and has the effect of improving system reset (frequency adjustable).

Furthermore, the tunable antenna 3 further has a first connecting line segment 38 and a second connecting line segment 39. The first connecting line segment 38 extends along the first direction A1, and the second connecting line segment 39 is along the second direction A2. The second radiating line segment 34, the first connecting line segment 38, the second connecting line segment 39 and the feeding line segment 31 are sequentially connected along the second direction A2. Thereby, the second radiation segment 34 can be well matched at the intermediate frequency, and the center frequency can be operated at about 3.5 GHz, with the effect of increasing the system reset (frequency adjustable).

The ground layer 4 is disposed on the second surface 12. In the embodiment, the ground layer 4 partially covers the sensing line segment 21 and the feeding line segment 31 in a vertical projection direction of the second surface 12 toward the first surface 11. Moreover, on the second surface 12, the ground layer 4 may have an irregular shape. For example, the edge of the ground layer 4 has a sensing notch 41, and the second surface 12 faces the first surface 11 vertically. In the projection direction, the sensing slot 41 is aligned with the sensing line segment 21, and in the second direction A2, the maximum width of the sensing slot 41 is greater than the maximum width of the sensing line segment 21; The end edge of the ground layer 4 has a feed slot 42. The feed slot 42 is aligned with the feed line segment 31 in the vertical projection direction of the second surface 12 toward the first surface 11. In the second direction A2, the maximum width of the feed slot 42 is not greater than the maximum width of the feed line segment 31. By the arrangement of the ground layer 4, the overall characteristics of the cognitive radio antenna of the present invention can be maintained, and the effect of achieving radio frequency sensing and system adjustment can be achieved.

When the cognitive radio antenna of the present invention has only the above components, it can be used for single Single-Input Single-Output (SISO). Further, the cognitive radio antenna of the present invention may additionally have an auxiliary tunable antenna 5 to make the present invention applicable to Multiple-Input Multiple-Output (MIMO).

The auxiliary tunable antenna 5 is disposed on the first surface 11 . The sensing antenna 2 is located between the tunable antenna 3 and the auxiliary tunable antenna 5 . The auxiliary tunable antenna 5 is disposed on the first surface 11 . The utility model has an auxiliary feeding line segment 51, an auxiliary adjusting line segment 52, a first auxiliary radiation segment 53, a second auxiliary radiation segment 54, a third auxiliary radiation segment 55, a first auxiliary diode 56 and a second The auxiliary diode segment 57 and the auxiliary adjustment line segment 52 extend along the first direction A1. The first auxiliary radiation segment 53, the second auxiliary radiation segment 54 and the third auxiliary radiation segment 55 The auxiliary feeding line segment 51, the first auxiliary diode 56 and the auxiliary adjusting line 52 are sequentially connected along the first direction A1. The auxiliary adjusting line segment 52, the first The second auxiliary diode 57 and the first auxiliary radiation segment 53 are sequentially connected along the second direction A2. The second auxiliary radiation segment 54 is connected to the auxiliary feeding segment 51. The third auxiliary radiation segment 55 is located at the first And between the auxiliary radiation segment 53 and the second auxiliary radiation segment 54 Adjustment of the auxiliary line 52, and in the second direction A2, the auxiliary line 52 to adjust the sensing distance based antenna 2 greater than the distance to the sensing antenna 53 2 of the first auxiliary line radiation. Thereby, when the sensing antenna 2 is disposed between the adjustable antenna 3 and the auxiliary adjustable antenna 5, the isolation between the adjustable antenna 3 and the auxiliary adjustable antenna 5 can be improved to reduce the adjustable The radiant energy directly coupled to the antenna 3 and the auxiliary tunable antenna 5 has the effect of increasing the isolation of the radiant energy.

The first auxiliary diode 56 and the second auxiliary diode 57 are both variable capacitance diodes. Thereby, through the arrangement of the first auxiliary diode 56 and the second auxiliary diode 57, the impedance of the auxiliary tunable antenna 5 can be changed by using a change in the capacitance value, and the auxiliary tunable antenna 5 can be adjusted. The electrical length is to achieve the function of system reset (frequency adjustable). Moreover, since the operating bandwidth of the first auxiliary radiation segment 53 can cover approximately 1.91 GHz to 3.35 GHz, the operating bandwidth of the second auxiliary radiating line segment 54 may cover approximately 3.35 GHz to 4.5 GHz, and the operating bandwidth of the third auxiliary radiating line segment 55 may cover approximately 4.5 GHz to 6.2 GHz, thereby transmitting the first auxiliary radiation The arrangement of the line segment 53, the second auxiliary radiation segment 54 and the third auxiliary radiation segment 55 enables the auxiliary adjustable antenna 5 to adjust the operating frequency between 2 GHz and 6 GHz, and has a system reset (frequency adjustable). Effect.

Moreover, in the first direction A1, the length of the auxiliary feeding line segment 51 is greater than the length of the auxiliary adjusting line segment 52; in the second direction A2, the length of the first auxiliary radiation segment 53 is greater than the second auxiliary radiation The length of the line segment 54 is longer than the length of the second auxiliary radiation segment 54 and less than the length of the first auxiliary radiation segment 53. Thereby, the auxiliary adjustable antenna 5 can have a good matching between 2 GHz and 6 GHz, and has the effect of improving the system reset (frequency adjustable).

Furthermore, the auxiliary adjustable antenna 5 further has a first auxiliary connecting line segment 58 and a second auxiliary connecting line segment 59. The first auxiliary connecting line segment 58 extends along the first direction A1, and the second auxiliary connecting line segment 59 The second direction A2 extends, and the auxiliary feeding line segment 51, the second auxiliary connecting line segment 59, the first auxiliary connecting line segment 58 and the second auxiliary radiating line segment 54 are sequentially connected in the second direction A2. Thereby, the second auxiliary radiation segment 54 can be well matched at the intermediate frequency, and the center frequency can be operated at about 3.5 GHz, with the effect of improving the system reset (frequency adjustable).

In addition, in the case that the cognitive radio antenna of the present invention further has the auxiliary adjustable antenna 5, the ground layer 4 partially covers the auxiliary feed line in the vertical projection direction of the second surface 12 toward the first surface 11. The segment 51, and the end edge of the ground layer 4 may further have an auxiliary feeding slot 43 for aligning the auxiliary feeding line segment 51, and in the second direction A2, the auxiliary The maximum width of the feed slot 43 is not greater than the maximum width of the auxiliary feed line 51. By the arrangement of the ground layer 4, the overall characteristics of the cognitive radio antenna of the present invention under the multiple input multiple output system can be maintained, and the effect of achieving radio frequency sensing and system adjustment can be achieved.

In order to prove that the cognitive radio antenna of the present invention does have the effect of radio frequency sensing and system adjustment, the following simulation is performed by the above implementation structure, and the simulation can be performed by a processor, and the simulation software can be any conventional frequency. The software of the response analysis is well known to those skilled in the art and will not be described again. In the above simulation, the length of the substrate 1 in the first direction A1 and the second direction A2 is 50 mm and 84 mm, respectively, and the thickness is 1.6 mm, and the sensing line segment 21 of the sensing antenna 2 is the largest in the second direction A2. The width of the circular section 22 of the sensing antenna 2 is 10 mm; the minimum length of the grounding layer 4 in the first direction A1 is 25 mm; the length of the grounding layer 4 in the second direction A2 is 84mm; the minimum length of the sensing notch 41 of the grounding layer 4 in the first direction A1 is 2mm; the maximum width of the sensing notch 41 of the grounding layer 4 in the second direction A2 is 7mm.

Please refer to FIG. 3 , which is a frequency response diagram of the sensing antenna 2 when it is disposed on the substrate 1 in the above manner (the state of change of each frequency between S11). As can be seen from FIG. 3 , the sensing antenna 2 There is a requirement of -10 dB in the frequency range of 2 GHz to 6 GHz, indicating that the sensing antenna 2 can have good radio frequency sensing capability in the frequency range of 2 GHz to 6 GHz.

In addition, the substrate 1 is provided with the tunable antenna 3 and the single-input single-output system in the first direction A1, except that the sensing antenna 2 and the ground layer 4 are disposed in the above manner. The length of the feeding line segment 31 is 28.5 mm; the length of the adjusting line segment 32 is 12.5 mm; the length of the first connecting line segment 38 is 8 mm; in the second direction A2, the width of the feeding line segment 31 is 3 mm; The width of the first radiation segment 33 is 14 mm; the width of the second radiation segment 34 is 3.5 mm; the width of the third radiation segment 35 is 7 mm; the first diode 36 and the second diode 37 are both It is 2.22pF. Moreover, the substrate 1 may be additionally provided with the auxiliary adjustable antenna 5 and operate in a multiple input multiple output system. In the first direction A1, the length of the auxiliary feeding line segment 51 is 28.5 mm; the auxiliary adjusting line segment 52 The length of the first auxiliary connecting line segment 58 is 8 mm; in the second direction A2, the width of the auxiliary feeding line segment 51 is 3 mm; the width of the first auxiliary radiating line segment 53 is 14 mm; Second auxiliary The width of the radiation segment 54 is 3.5 mm; the width of the third auxiliary radiation segment 55 is 7 mm; the first auxiliary diode 56 and the second auxiliary diode 57 are both 2.22 pF.

Referring to FIG. 4, when the tunable antenna 3 or the auxiliary tunable antenna 5 is disposed on the substrate 1 in the above manner, a first curve L1 represents a frequency response diagram under the single input single output system (S11). In the state of change between the frequencies when only the tunable antenna 3 is present, a second curve L2 represents a frequency response diagram under the MIMO system (S11 has both the tunable antenna 3 and the auxiliary tunable The state of change between the frequencies of the antenna 5), as can be seen from FIG. 4, the sensing radio antenna of the present invention can be respectively at a low frequency (about 2.2 GHz to 2.6 GHz), whether it is a single input single output system or a multiple input multiple output system. ), the intermediate frequency (about 3.4 GHz to 3.7 GHz) and the high frequency (about 4.6 GHz to 5 GHz) and other frequency bands reach the requirement of -10 dB, indicating that the tunable antenna 2 or the auxiliary tunable antenna 5 can be in the frequency band of 2 GHz to 6 GHz. Good system reset capability within range.

In summary, the sensing radio antenna of the present invention can achieve the functions of radio frequency sensing and system resetting through the sensing antenna 2 and the tunable antenna 3, and can effectively detect the applicable frequency band and the switching operation in the cognitive radio system. Frequency, which has the effect of improving the efficiency of spectrum resource usage.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

Claims (15)

A sensing radio antenna includes: a substrate having a first surface and a second surface; a sensing antenna disposed on the first surface, the sensing antenna having a sensing line segment and a a circular section, the sensing line segment and the circular section are sequentially connected in a first direction; an adjustable antenna, the adjustable antenna is disposed on the first surface, and the adjustable antenna has a feeding line segment An adjustment line segment, a first radiation line segment, a second radiation segment, a third radiation segment, a first diode, and a second diode, the feed segment and the adjustment segment being along the first The first radiation line segment, the second radiation line segment and the third radiation line segment extend along a second direction, and the second direction is perpendicular to the first direction, the feeding line segment and the first diode And the adjusting line segment is sequentially connected along the first direction, the first radiant line segment, the second diode body and the adjusting line segment are sequentially connected along the second direction, and the second radiant line segment is connected to the feeding line segment The third radiation line segment is located at the first radiation line And connecting the adjustment line segment between the second radiation line segment, and in the second direction, the distance from the adjustment line segment to the sensing antenna is greater than the distance from the first radiation line segment to the sensing antenna; The ground layer is disposed on the second surface, and the ground layer partially covers the sensing line segment and the feeding line segment in a vertical projection direction of the second surface toward the first surface. The cognitive radio antenna of claim 1, wherein in the second direction, the length of the first radiation segment is greater than the length of the second radiation segment. The cognitive radio antenna of claim 1, wherein in the second direction, the length of the third radiation segment is greater than the length of the second radiation segment and less than the length of the first radiation segment. The sensible radio antenna of claim 1, wherein the tunable antenna further has a first connecting line segment and a second connecting line segment, the first connecting line segment extending along the first direction, the second connecting line segment Extending in the second direction, and the second radiation segment, the first connection The wiring section, the second connecting line segment and the feeding line segment are sequentially connected in the second direction. The cognitive radio antenna of claim 1, wherein the length of the feed line segment is greater than the length of the adjustment line segment in the first direction. The sensor radio antenna according to claim 1, wherein the first diode and the second diode are variable capacitor diodes. The cognitive radio antenna of claim 1, wherein the circular section of the sensing antenna has a slot segment extending in the second direction. The sensory radio antenna of claim 1, wherein the sensing line segment of the sensing antenna has a first sensing feeder segment, a second sensing feeder segment and a third sensing feeder segment, The first sensing feeder segment, the second sensing feeder segment and the third sensing feeder segment are sequentially connected along the first direction, and in the first direction, the length of the first sensing feeder segment is less than The length of the second sensing feeder segment, the length of the second sensing feeder segment is smaller than the third sensing feeder segment; and, in the second direction, the width of the first sensing feeder segment is greater than the second The width of the feeder segment is sensed, and the width of the second sensing feeder segment is greater than the width of the third sensing feeder segment. The cognitive radio antenna according to claim 1, wherein the auxiliary adjustable antenna is disposed on the first surface, and the sensing antenna is located on the first surface. Between the modulated antenna and the auxiliary adjustable antenna, the auxiliary adjustable antenna has an auxiliary feed line segment, an auxiliary adjustment line segment, a first auxiliary radiation segment, a second auxiliary radiation segment, a third auxiliary radiation segment, and a a first auxiliary diode and a second auxiliary diode, the auxiliary feeding line segment and the auxiliary adjusting line segment extending along the first direction, the first auxiliary radiation segment, the second auxiliary radiation segment and the third The auxiliary radiation line segment extends along the second direction, and the auxiliary feed line segment, the first auxiliary diode and the auxiliary adjustment line segment are sequentially connected along the first direction, the auxiliary adjustment line segment and the second auxiliary diode And the first auxiliary radiation segment is sequentially connected along the second direction, and the second auxiliary radiation segment is connected to the auxiliary feed line a third auxiliary radiation line segment between the first auxiliary radiation line segment and the second auxiliary radiation line segment and connected to the auxiliary adjustment line segment, and in the second direction, the auxiliary adjustment line segment to the sensing antenna The distance is greater than the distance of the first auxiliary radiation segment to the sensing antenna. The cognitive radio antenna of claim 9, wherein in the second direction, the length of the first auxiliary radiation segment is greater than the length of the second auxiliary radiation segment. The cognitive radio antenna of claim 9, wherein in the second direction, the length of the third auxiliary radiation segment is greater than the length of the second auxiliary radiation segment and less than the length of the first auxiliary radiation segment. The sensible radio antenna according to claim 9 , wherein the tunable antenna further has a first auxiliary connecting line segment and a second auxiliary connecting line segment, the first auxiliary connecting line segment extending along the first direction, the first The second auxiliary connecting line segment extends along the second direction, and the auxiliary feeding line segment, the second auxiliary connecting line segment, the first auxiliary connecting line segment and the second auxiliary radiating line segment are sequentially connected along the second direction. The cognitive radio antenna of claim 9, wherein the length of the auxiliary feed line segment is greater than the length of the auxiliary adjustment line segment in the first direction. The sensible radio antenna according to claim 9, wherein the first auxiliary diode and the second auxiliary diode are variable capacitor diodes. The cognitive radio antenna of claim 9, wherein the ground layer partially covers the auxiliary feed line segment in a vertical projection direction of the second surface toward the first surface.