TW201622249A - Antenna array of hybrid irradiator subassembly - Google Patents

Abstract

The utility model relates to an antenna array indicates an antenna array of hybrid irradiator subassembly especially. It has contained the metal irradiator of compriseing the dipole radiation body and the fold dipole radiation body to see through parallelly connected metal irradiator and reach impedance match's mesh, simultaneously, input impedance makes for inductive fold dipole radiation body compensates its capacitance effect in aforementioned antenna operation frequency channel for the dipole radiation body of capacitive character receives for the input impedance that is the utilization in specific day string handle frequency channel the utility model discloses an antenna array of hybrid irradiator subassembly can be under specific sky string handle frequency channel, the advantage of performance high efficiency, high directivity.

Description

Antenna array of hybrid radiator elements 【0001】

The invention relates to an antenna array, in particular to a hybrid radiation having a parallel structure to achieve impedance matching and using the inductance effect of the folded dipole radiator to compensate the capacitance effect of the dipole radiator and allowing the resonance point to be at a specific antenna operating frequency. An antenna array of body elements.

【0002】

The rapid development of wireless communication technology has made the antenna design trend tend to be miniaturized and the transmission system has multiple frequency bands. Therefore, it is necessary to integrate multiple antennas into the same antenna module to achieve increasingly strict design standards.

[0003]

Generally, the array antenna is composed of many identical single antennas arranged in a regular order. The radiation field pattern of a single antenna is difficult to control, the gain is not high, and other important parameters often cannot meet the high-standard usage requirements of today's industry, so Array antennas are needed to improve some products with higher transmission quality requirements. Each of the array antennas has a certain arrangement rule and a signal feed conduction mode, so as to achieve the required effect, the more the number of antenna elements, the higher the gain and the relatively large size. Another problem to be considered in development is to satisfy impedance matching. Poor matching will affect the sensitivity of the transmission and reception system and the accuracy of the system. For high-power or high-sensitivity transmission systems, the long-term impedance mismatch will further affect the stability of the system.

[0004]

The invention is based on the concept improvement of the array antenna, and develops an antenna array of a hybrid radiator element combining a plurality of radiators, so as to obtain complementary effects by utilizing novel combinations of different radiators, and satisfying high-performance and low-cost industries. Demand, but also in the size control, and strive to meet the trend of miniaturized electronic product development.

[0005]

The main object of the present invention is to provide an antenna array of a hybrid radiator element having a metal radiator structure connected in parallel with each other to reduce the antenna array of the hybrid radiator element when the impedance of the single metal radiator structure is high. The overall impedance is still able to achieve impedance matching, in line with industry standards to ensure its application value.

[0006]

Another object of the present invention is to provide an antenna array of a hybrid radiator element having a folded dipole radiator and a dipole radiator in a metal radiator structure, and a folded dipole radiator in an antenna operating frequency band As an inductive component, to compensate for the capacitive effect of the dipole radiator, the resonant frequency of the antenna array can be substantially adjusted and fall at a frequency of 2.4 GHz.

【0007】

Still another object of the present invention is to provide an antenna array of a hybrid radiator element which has high directivity and high efficiency at a frequency of 2.4 GHz and is suitable for use in existing wireless communication products.

[0008]

A further object of the present invention is to provide an antenna array of a hybrid radiator element that can be further connected to a low-pass filter to allow only low-frequency signals (such as the aforementioned 2.4 GHz) to pass, thereby avoiding the passage of high-frequency signals. Become a noise in other systems (such as WiMax operating at 3GHz or WLAN at 5GHz) or interference from multiplier resonance.

【0009】

It is still another object of the present invention to provide an antenna array of hybrid radiator elements that can be disposed on only one side of the microwave substrate, which is beneficial in the simplification of the process.

[0010]

The invention discloses an antenna array of a hybrid radiator element. The basic and necessary structure comprises a high frequency signal feeding transmission line, and the two ends of the high frequency signal feeding transmission line are respectively connected with a metal radiator. The metal radiation bodies are connected in parallel, and the high-frequency signal is fed into the transmission line with a signal feeding point and a signal grounding point. The metal radiation systems are bilaterally symmetric with respect to the signal feeding point and the signal grounding point, and each The metal radiation system comprises: a dipole radiator having an input impedance that is capacitive in an antenna operating frequency band, and comprising a first dipole radiating arm and a second dipole radiating arm, the high frequency signal feeding The input transmission line is connected to one of the first contact of the first dipole radiating arm and the second contact of the second dipole radiating arm; and a folded dipole radiator whose input impedance is within the operating band of the antenna Inductive, and a third contact and a fourth contact of the two ends are respectively connected to the high frequency signal feeding transmission line and form a loop, and used to compensate the capacitance effect of the dipole radiator; Below the antenna array of the hybrid radiator elements provided with a metal reflector.

1‧‧‧High frequency signal feed transmission line
1A‧‧‧First transmission line
1B‧‧‧second transmission line
10‧‧‧ Signal Feeding Point
11‧‧‧ Signal Grounding Point
2‧‧‧Metal radiator
21‧‧‧ Dipole radiator
21A‧‧‧First dipole radiating arm
210A‧‧‧First contact
21B‧‧‧Second dipole radiation arm
210B‧‧‧second junction
22‧‧‧Folding dipole radiator
22A‧‧‧ third joint
22B‧‧‧fourth joint
3‧‧‧Microwave substrate
4‧‧‧Metal reflector
50‧‧‧Feeding line
51‧‧‧Low-pass filter
D‧‧‧ interval
S‧‧‧The distance between the first contact and the third contact
(1)~(3)‧‧‧ test results

[0011]

Figure 1 is a schematic view showing the structure of a preferred embodiment of the present invention;
Figure 2 is a partial structural view of a preferred embodiment of the present invention for indicating the structure of a metal radiator;
3 is a side view showing a structure of a preferred embodiment of the present invention for indicating the relative position of the microwave substrate and the metal reflector;
Figure 4 is a graph showing an input impedance curve of an imaginary part according to a preferred embodiment of the present invention;
Figure 5A is a diagram showing an E-plane radiation field pattern of a preferred embodiment of the present invention;
FIG. 5B is a diagram showing a H-plane radiation field pattern according to a preferred embodiment of the present invention;
Figure 6 is a return loss diagram of a preferred embodiment of the present invention;
7A is a schematic structural view of another preferred embodiment of the present invention for indicating a low-pass filter; and FIG. 7B is a return loss diagram of another preferred embodiment of the present invention; Used to indicate the test result with the low pass filter set.

[0012]

For a better understanding and understanding of the features and advantages of the present invention, the preferred embodiments and the detailed description are described as follows:

[0013]

First, referring to FIG. 1 and FIG. 2 together, the antenna array of the hybrid radiator element disclosed in the preferred embodiment of the present invention comprises a high frequency signal feed transmission line 1 and a pair of metal structures. The radiator 2, the two ends of the high-frequency signal feeding transmission line 1 are respectively connected to a metal radiator 2, and the metal radiators 2 are connected in parallel. In the preferred embodiment of the present invention, the high-frequency signal feed transmission line 1 includes a first transmission line 1A and a second transmission line 1B, which are disposed in parallel, and the points in the first transmission line 1A and the second transmission line 1B respectively have Signal feed point 10 and signal ground point 11. The signal feed point 10 can be connected to the center signal wire of the feed line (not shown) to feed the high frequency signal, and the signal ground point 11 is connected to the ground wire of the feed line. The metal radiators 2 are connected to the two ends of the high-frequency signal feed transmission line 1 and are symmetrically arranged with the signal feed point 10 and the signal ground point 11 as the center of symmetry.

[0014]

The single metal radiator 2 itself comprises a set of dipole radiators 21 and a folded dipole radiator 22, both of which are connected to the high frequency signal feed transmission line 1.

[0015]

The dipole radiator 21 includes a first dipole radiating arm 21A and a second dipole radiating arm 21B. The lengths of the two radiating arms are the same, and are vertically symmetrical with respect to the high frequency signal feeding transmission line 1. The connection between the dipole radiator 21 and the high frequency signal feed transmission line 1 is transmitted through the first contact 210A at one end of the first dipole radiating arm 21A and the second contact 210B at one end of the second dipole radiating arm 21B. The length of the dipole radiator 21 in the preferred embodiment of the present invention is substantially 1.25 operating wavelengths (1.25λ), which is longer than a typical half-wavelength dipole antenna (0.5λ), and has a larger Gain effect, energy is more concentrated.

[0016]

The folded dipole radiator 22 is not directly connected to the dipole radiator 21, and the third contact 22A and the fourth contact 22B at both ends thereof are respectively coupled to the first transmission line 1A and the second of the high frequency signal feeding transmission line 1. The ends of the transmission line 1B are connected, and the folded dipole radiator 22 itself is in the form of a loop. The folded dipole radiator 22 of the preferred embodiment of the present invention has a length of 0.9 to 1 operating wavelength (0.9 to 1 λ). The distance S between a contact 210A and the third contact 22A is preferably less than 0.25 operating wavelengths (0.25 λ).

[0017]

In the antenna array of the hybrid radiator element of the present invention, the input impedance of the dipole radiator 21 is capacitive in an antenna operating band (as shown by the curve (1) in Fig. 4, the imaginary input impedance < 0), the antenna operating frequency band is 2.4GHz as the center frequency, which is a wireless transmission frequency band commonly used in the world, such as wireless area network (IEEE 802.11b/IEEE 802.11g), Bluetooth, ZigBee, etc. The frequency is transmitted. Therefore, in order to compensate for the capacitive effect of the dipole radiator 21, the present invention uses the folded dipole radiator 22 having an input impedance in the antenna operating band as an inductive component, as shown by the curve (2) in FIG. Its imaginary input impedance is >0. The advantage of the folded dipole radiator 22 is that it is itself a metal body and can be used as a part of the antenna to transmit signals, which has a double benefit.

[0018]

The high-frequency signal feed transmission line 1 and the metal radiator 2 mentioned above can be formed on one side of a microwave substrate 3 by printing, and the high-frequency signal feeding transmission line 1 and the metal radiator 2 are connected together in the printing process. Forming. The high-frequency signal is radiated on both sides of the metal radiator 2, and in order to improve the directivity of the present invention, a metal reflector 4 is disposed under the microwave substrate 3 to reflect the energy radiated toward the microwave substrate 3 Facing above the microwave substrate 3, the energy radiated toward the upper side of the microwave substrate 3 is stronger, and has better directivity and signal intensity.

[0019]

Referring to FIG. 3, there is a gap D between the microwave substrate 3 and the metal reflector 4, the height of which is less than 0.15 operating wavelengths, and preferably the range is substantially 0.08 operating wavelengths. The spacing D between the microwave substrate 3 and the metal reflector 4 in the preferred embodiment of the present invention is not 0.25 operating wavelengths (the signals reflected after the radiation are returned to the microwave substrate 3 by a distance of half a wavelength). The reason for the gain effect is that the length of the high frequency signal feed transmission line 1 is substantially less than 50 mm so that the two metal radiators 2 are adjacent (S preferably less than 0.25 operating wavelengths), and the microwave substrate 3 and the metal Under the influence of the area and shape of the reflector 4 being substantially the same, the energy emitted by the two hybrid metal radiators 2 interacts, and the reflection at a small interval D achieves a significant enhancement benefit, so the microwave substrate 3 The distance from the metal reflector 4 can be reduced to less than 0.15 operating wavelengths, and it can be applied to electronic products having a small volume and space.

[0020]

Please refer to FIG. 4 , which is a graph of the input impedance of the imaginary part according to a preferred embodiment of the present invention; wherein the curve (1) is an imaginary input impedance curve of the dipole radiator 21, and the curve (2) is a folded couple. The imaginary part of the polar radiator 22 is input with an impedance curve, and the curve (3) is an imaginary input impedance curve of the high frequency signal feeding transmission line 1, the dipole radiator 21 and the folded dipole radiator 22. As shown, the dipole radiator 21 itself is capacitive in the 2.4 GHz antenna operating band (imaginary input impedance < 0), and the folded dipole radiator 22 is inductive in the 2.4 GHz antenna operating band (imaginary input) The impedance is >0), and after the combination, the high-frequency signal is fed into the transmission line 1 and the resonance point (the imaginary input impedance is almost zero) is adjusted to fall at 2.4 GHz.

[0021]

The input impedance of the antenna is the ratio of the input voltage to the input current at the antenna feed end, and the antenna is connected to the feed line. The best case is that the input impedance of the antenna is pure resistance and equal to the characteristic impedance of the feed line. At this time, the feed line terminal has no power. Reflection, there is no standing wave on the feed line. In the preferred embodiment of the present invention, the impedance of the metal radiator 2 is 100 ohms, and after being connected in parallel with the foregoing structure, it can be reduced to 50 ohms to achieve impedance matching, which is in line with industry considerations to energy transfer and energy. The attenuation is balanced and the common standard is matched with the 2.4 GHz antenna operating frequency band. Therefore, the present invention fully complies with the application conditions of the existing industry standards. 5A and 5B are respectively the E-plane and H-plane radiation field patterns of the preferred embodiment of the present invention, which reveals that the beam width of the signal power attenuation is half (3 dB), and the beam width is about 50 degrees in the E plane and the H plane, respectively. 64 degrees.

[0022]

Please refer to the return loss diagram shown in FIG. 6. As shown in the figure, the preferred embodiment of the present invention emits a signal in a frequency band higher than 2.5 GHz in addition to the frequency of the 2.4 GHz frequency signal. It may cause interference to other systems, such as WiMax operating at 3GHz or 5GHz WLAN. Therefore, referring to another preferred embodiment of FIG. 7A, the present invention can further enable the high frequency signal to be fed into the transmission line 1 to be connected to a low pass filter 51 through the feed line 50, and the low pass filter 51 can filter a high frequency signal, such as a signal above 2.5 GHz, such that the antenna array of the hybrid radiator element of the present invention avoids radiating signals above a predetermined operating frequency, such as the return loss shown in FIG. 7B, the present invention The antenna array of the hybrid radiator element has a small amount of energy radiated from the signal above 2.5 GHz, which is equivalent to background noise, and thus does not interfere with signal reception of other systems.

[0023]

In summary, the present invention discloses in detail an antenna array of a hybrid radiator element, which considers that the input impedance of the dipole radiator is capacitive in a specific antenna operating frequency band, and thus the folded dipole radiator is used. The specific antenna operating frequency band acts as an inductive component, which compensates for the capacitive effect of the dipole radiator, so that the operating frequency of the antenna array of the hybrid radiator component can meet the standards of industrial application; and for the problem of impedance matching, The parallel technique is used to reduce the impedance to a predetermined value to achieve a match. In addition, the present invention can also reduce the distance between the metal reflector and the microwave substrate where the antenna array is located according to requirements, in order to cope with the trend of miniaturization of electronic components; and based on the problem of signal interference, the method of adding a low-pass filter can be easily utilized. Complete signal filtering. The invention has the advantages of high efficiency, high pointing orientation and high gain, and its structural features do not impose any additional burden on the existing manufacturing process in the industry, so the invention is undoubtedly a practical and combined with many advantages. An antenna array of hybrid radiating elements of commercial value.

[0024]

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and the variations, modifications, and modifications of the shapes, structures, features, and spirits described in the claims of the present invention. All should be included in the scope of the patent application of the present invention.

1‧‧‧High frequency signal feed transmission line

1A‧‧‧First transmission line

1B‧‧‧second transmission line

10‧‧‧ Signal Feeding Point

11‧‧‧ Signal Grounding Point

21‧‧‧ Dipole radiator

21A‧‧‧First dipole radiating arm

210A‧‧‧First contact

21B‧‧‧Second dipole radiation arm

210B‧‧‧second junction

22‧‧‧Folding dipole radiator

22A‧‧‧ third joint

22B‧‧‧fourth joint

3‧‧‧Microwave substrate

4‧‧‧Metal reflector

D‧‧‧ interval

S‧‧‧The distance between the first contact and the third contact

Claims (9)

[Item 1] An antenna array of a hybrid radiator element includes a high frequency signal feeding transmission line, and two ends of the high frequency signal feeding transmission line are respectively connected to a metal radiator, and the metal radiators are connected in parallel, and the high frequency The signal feeding into the transmission line has a signal feeding point and a signal grounding point. The metal radiation systems are bilaterally symmetric with respect to the signal feeding point and the signal grounding point, and each of the metal radiation systems comprises:
a dipole radiator having an input impedance that is capacitive in an antenna operating frequency band and includes a first dipole radiating arm and a second dipole radiating arm, the high frequency signal feeding transmission line being connected to the first a first contact of a dipole radiating arm and a second contact of the second dipole radiating arm; and a folded dipole radiating body whose input impedance is inductive in the operating band of the antenna, and two of One of the third contact and the fourth contact are respectively connected to the high frequency signal feed transmission line and form a loop, and are used to compensate the capacitance effect of the dipole radiator;
Wherein, a metal reflector is disposed under the antenna array of the hybrid radiator element. [Item 2] The antenna array of the hybrid radiator element of claim 1, wherein the dipole radiator has a length of substantially 1.25 operating wavelengths. [Item 3] The antenna array of the hybrid radiator element of claim 1, wherein the folded dipole radiator has a length of 0.9 to 1 operating wavelength. [Item 4] The antenna array of the hybrid radiator element of claim 1, wherein the high frequency signal feeding transmission line and the metal radiation system are disposed on one side of a microwave substrate. [Item 5] The antenna array of the hybrid radiator element of claim 4, wherein the distance between the microwave substrate and the metal reflector is less than 0.15 operating wavelengths. [Item 6] The antenna array of the hybrid radiator element of claim 4, wherein the area and shape of the microwave substrate and the metal reflector are substantially the same. [Item 7] The antenna array of the hybrid radiator element of claim 1, wherein the high frequency signal feed line is further connected to a low pass filter. [Item 8] The antenna array of the hybrid radiator element of claim 1, wherein the first dipole radiating arm and the second dipole radiating arm are the same length. [Item 9] The antenna array of the hybrid radiator element of claim 1, wherein the distance between the first contact and the third contact is less than a quarter wavelength of the operating frequency.