CN108539385B - Low-profile miniaturized vehicle-mounted antenna with high different frequency isolation based on filter oscillator - Google Patents
Low-profile miniaturized vehicle-mounted antenna with high different frequency isolation based on filter oscillator Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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Abstract
The invention discloses a high-different-frequency isolation low-profile miniaturized vehicle-mounted antenna based on a filter oscillator, which comprises a first antenna, a second antenna and a third antenna, wherein the first antenna comprises a vertical polarization low-frequency oscillator, the second antenna adopts a vertical polarization high-frequency oscillator, the third antenna is a horizontal polarization antenna covering high and low frequencies, and the vertical polarization first antenna, the second antenna and the horizontal polarization third antenna form a dual-frequency dual-polarized antenna; the first antenna is provided with a filter feed structure for suppressing higher harmonics thereof in a wide frequency band. The filter feed structure can realize the suppression of the higher harmonic wave of 1.7-2.7GHz of the first antenna, an additional filter circuit is not required to be introduced, and the insertion loss introduced by the traditional filter cascading method is avoided. The first antenna and the second antenna which are vertically polarized and the third antenna which is horizontally polarized are adopted to form a dual-frequency dual-polarized antenna, and the dual-frequency dual-polarized antenna is mutually complemented to realize the full coverage of signals.
Description
Technical Field
The invention relates to the field of antenna research in the field of wireless mobile communication, in particular to a low-profile miniaturized vehicle-mounted antenna with high-different-frequency isolation based on a filter oscillator.
Background
In modern society, mobile communication is an important foundation of information technology industries such as internet of things and mobile internet, and is closely related to our daily life. With the development of mobile communication, the number of mobile communication systems and communication frequency bands is increasing. The performance of the antenna as a terminal for receiving and transmitting information in a mobile communication system can greatly influence the operation of the whole communication system equipment. However, in practical application, because the space reserved for the antennas by the communication device is very limited, the antennas with different frequency bands need to be integrated. In a limited space, different frequency antennas can generate strong different frequency coupling, for example, interference of higher harmonics of a low frequency antenna to a high frequency antenna can seriously affect the performance of the antenna and even the subsequent whole communication system.
The current scheme for realizing different-frequency decoupling adopts a filter oscillator, so that the introduction of an additional decoupling structure can be avoided, the whole volume of the antenna is reduced, and the radiation performance of the antenna is ensured not to be affected. The main design method of the traditional filter vibrator is a filter cascading method, namely, a filter is cascaded with a radiator of an antenna to filter clutter of interference. However, this approach increases the antenna volume and complexity on the one hand and introduces a large insertion loss on the other hand. Therefore, the filter oscillator is realized without increasing the whole size of the antenna and introducing insertion loss, and the filter oscillator is of great significance in different-frequency decoupling of multiple antennas in different frequency bands.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a low-profile miniaturized vehicle-mounted antenna with high-frequency and low-frequency isolation based on a filter oscillator.
The aim of the invention is achieved by the following technical scheme: the low-profile miniaturized vehicle-mounted antenna based on the high-different-frequency isolation of the filter oscillator comprises a first antenna, a second antenna and a third antenna, wherein the first antenna comprises a vertical polarized low-frequency oscillator, the second antenna adopts a vertical polarized high-frequency oscillator, the third antenna is a horizontal polarized antenna covering high and low frequencies, and the vertical polarized first antenna, the second antenna and the horizontal polarized third antenna form a dual-frequency dual-polarized antenna; the first antenna is provided with a filter feed structure for suppressing higher harmonics thereof in a wide frequency band. In the invention, the filter feed structure is arranged on the first antenna, an additional filter circuit is not needed, the insertion loss can be avoided, and the high different frequency isolation and miniaturization performance are brought to the integration of the first antenna and the second antenna. The first antenna, the second antenna and the third antenna which are vertically polarized form a dual-frequency dual-polarized antenna, so that the whole coverage of high-frequency signals and low-frequency signals in space can be realized.
Preferably, the filter feed network is formed by adopting open branch wires loaded at two ends of a feed line and quarter-wavelength open slot wires etched on the surface of the feed line, and the filter feed network is printed at the bottom of the second dielectric substrate, so that the high-order harmonic suppression of 1.7-2.7GHz of the first antenna is realized.
Furthermore, the number of the open-circuit slot lines is two, the lengths of the open-circuit slot lines are different, the open-circuit branch lines filter out the higher harmonic wave of about 1.8GHz, and the open-circuit slot lines with the two different lengths filter out the higher harmonic wave in the frequency range of 2.1-2.7 GHz. Thereby realizing the suppression of the higher harmonic wave of the first antenna in the wide frequency band range. Compared with the traditional filter and antenna cascade filtering scheme, the filtering feed network is adopted without introducing an additional filtering circuit, so that the system volume is effectively reduced, and the insertion loss is avoided.
Preferably, the vertically polarized low frequency oscillator in the first antenna is a "defect ellipsoid" vertically polarized low frequency oscillator, and is printed on the first dielectric substrate, and the height is one sixth wavelength of the central working frequency of the first antenna. The antenna has the function of high-order harmonic suppression, and can realize different-frequency decoupling between the first antenna and other antennas without adding an additional filter circuit.
Preferably, the vertically polarized high frequency vibrator in the second antenna is a broadband 'binary' vertically polarized high frequency vibrator, and is printed on the third dielectric substrate.
Further, the first antenna operating frequency band is 825-960MHz, and the second antenna operating frequency band is 1710-2690MHz. And the vertical polarization coverage of high and low frequencies is realized while different antenna different frequency decoupling is completed.
Preferably, the third antenna is a printed type Vivaldi antenna, and is printed on the fourth dielectric substrate, and is placed horizontally, and the height of the third antenna is one third wavelength of the central working frequency of the third antenna. Coverage of horizontal polarization for high and low frequencies can be achieved.
Preferably, a metal reflecting surface is arranged on the periphery of the first antenna, the second antenna and the third antenna, and the height of the metal reflecting surface is smaller than one quarter wavelength of the lowest working frequency band of the vehicle-mounted external antenna. The high gain and low profile performance of the vehicle antenna can be realized through the metal reflecting surface.
Furthermore, the metal reflecting surface is a bell-shaped bending metal reflecting surface and is formed by bending and combining five metal plates with different lengths on a bell-shaped antenna base plate and a bell-shaped outline.
Further, the first antenna is arranged at the focal position in the metal reflecting surface, and the nearest distance between the second antenna and the metal reflecting surface is a wavelength corresponding to half of the central working frequency.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the vehicle-mounted antenna provided by the invention adopts a vertically polarized low-frequency oscillator with a higher harmonic suppression function, and the filtering feed network is formed by an open branch node line loaded at two ends of a feed line and a quarter-wavelength open slot line etched on the surface of the feed line. The open-circuit branch line filters out the higher harmonic wave of about 1.8GHz, and the two open-circuit slot lines with different lengths filter out the higher harmonic wave in the frequency range of 2.1-2.7 GHz. And an additional filter circuit is not required to be introduced, so that insertion loss is avoided, and the whole size of the antenna is effectively reduced.
2. The vehicle-mounted antenna can inhibit higher harmonic waves of the vertically polarized low-frequency oscillator in a wide frequency band range, and avoids the coupling influence of the vertically polarized high-frequency oscillator under the condition of not adding an additional decoupling structure. The method effectively reduces the whole volume and has no influence on the radiation performance of each antenna.
3. The working frequency band of the first antenna based on the vertical polarization low-frequency oscillator is 825-960MHz, and the working frequency band of the second antenna based on the vertical polarization high-frequency oscillator is 1710-2690MHz, so that different frequency decoupling of different antennas is realized, and meanwhile, the coverage of vertical polarization of high frequency and low frequency is realized.
4. The invention adopts the bell-shaped bending metal reflecting surface, the height of which is smaller than one quarter wavelength corresponding to the lowest working frequency band of the vehicle-mounted external antenna, and realizes the high gain and low profile performance of the vehicle-mounted antenna.
5. The dual-frequency dual-polarized antenna is formed by adopting the vertical polarization low-frequency oscillator, the vertical polarization high-frequency oscillator and the horizontal polarization antenna covering high and low frequencies, so that the radiation energy in different angle areas is mutually supplemented and enhanced while the high and different frequencies are isolated, and the full coverage of high and low frequency signals is realized.
6. The vehicle-mounted antenna can be applied to the field of wireless mobile communication, in particular to a wireless communication scene of an unmanned automobile, and can be applied to receiving and transmitting equipment of a future vehicle-mounted communication system. The adoption of the filter oscillator in the vehicle-mounted antenna can realize high-different-frequency isolation performance, and further meet the performance requirement of the vehicle-mounted antenna in the aspect of dual-frequency dual-polarization miniaturization.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a particular embodiment of a high-frequency isolation low-profile miniaturized vehicle-mounted antenna based on a filter element of the present invention;
FIG. 2 is a top view of the vehicle antenna structure of FIG. 1;
FIG. 3 is a side view of the vehicle antenna of FIG. 1 with the bell-folded metal reflector structure removed;
FIG. 4 is a schematic diagram of a first antenna of the vehicle-mounted antenna shown in FIG. 1;
FIG. 5 is a schematic diagram of a first in-antenna filter feed network in the in-vehicle antenna of FIG. 1;
FIG. 6 is a schematic diagram of a second antenna of the vehicle-mounted antenna shown in FIG. 1;
FIG. 7 is a schematic diagram of a third antenna of the vehicle antenna shown in FIG. 1;
FIG. 8 is a schematic perspective view of a bell-folded metal parabolic reflector of the vehicle antenna of FIG. 1;
FIG. 9 is an S-parameter curve of the vehicle antenna shown in FIG. 1;
FIG. 10 is a schematic diagram of the vehicle antenna of FIG. 1 in S with and without a filtered feed network 21 ，S 11 A curve;
FIG. 11 is an antenna gain curve for the vehicle antenna of FIG. 1 with and without the filtered feed network, respectively;
FIG. 12 is a vertical polarization pattern of the first antenna of the vehicle antenna of FIG. 1 at a frequency of 0.9GHz;
fig. 13 is a vertical polarization pattern of a second antenna of the vehicle antenna shown in fig. 1 at different frequencies: a) 1.8GHz; b) 2.7GHz;
fig. 14 is a horizontal polarization pattern of a third antenna of the vehicle-mounted antenna shown in fig. 1 at different frequencies: a) 0.9GHz; b) 1.8GHz; c) 2.7GHz.
Detailed Description
Technical details of the present invention will be clearly and thoroughly described below with reference to the accompanying drawings in the embodiments of the present invention, wherein the described embodiments are only some embodiments, but not all embodiments of the present invention. Based on the embodiments of the present invention, other embodiments that may be obtained by those of ordinary skill in the art without making any inventive effort are within the scope of the present invention.
The low-profile miniaturized vehicle-mounted antenna with high-frequency isolation based on the filter oscillator can be applied to receiving and transmitting equipment of a future vehicle-mounted communication system, and referring to fig. 1, 2 and 3, the vehicle-mounted antenna structure of the embodiment comprises a first antenna, a second antenna, a third antenna 3 and a bell-shaped bending metal reflecting surface 4. The first antenna is composed of a 'defect ellipsoid' -shaped vertical polarization low-frequency oscillator 1 and a filtering feed network 8, the second antenna adopts a binary-type vertical polarization high-frequency oscillator 2, and the third antenna 3 adopts a printed type Vivaldi structure, so that high-frequency and low-frequency horizontal polarization can be covered.
Referring to fig. 4, the first antenna includes a vertically polarized low frequency vibrator of a "defective ellipsoid" type placed vertically, and is printed on the first dielectric substrate 5 to a height of one sixth wavelength of the central operating frequency of the first antenna.
Referring to fig. 5, the filter feed network 8 of the first antenna of the vehicle-mounted antenna of this embodiment is printed at the bottom of the second dielectric substrate 11, and is mainly divided into two parts: part of the filter is an open-circuit branch line 9 loaded at two ends of the feeder, and the open-circuit branch line 9 filters out higher harmonics of about 1.8GHz; the other part is a feeder line 10 with a quarter-wavelength open slot line, and the two open slot lines with different lengths filter out the higher harmonic wave in the frequency range of 2.1-2.7GHz, so that the higher harmonic wave of the first antenna is restrained in the wide frequency range, and the different-frequency isolation between the antennas is improved. Compared with the traditional filter and antenna cascade filtering scheme, the filtering feed network 8 is adopted without introducing an additional filtering circuit, so that the system volume is effectively reduced, the insertion loss is avoided, and the high different frequency isolation of the whole vehicle-mounted antenna is realized.
Referring to fig. 6, the second antenna is a broadband binary vertical polarized high-frequency oscillator 2, which is printed on a third dielectric substrate 6, and has a nearest distance from a bell-shaped bent metal reflecting surface 4 of about half a wavelength corresponding to a central working frequency, and the gain of the antenna is improved by the action of the metal reflecting surface 4.
Referring to fig. 7, the third antenna 3 is a printed type vivaldi antenna, and is printed on the fourth dielectric substrate 7, and is placed horizontally, and the height is one third wavelength of the central working frequency of the third antenna, so that the coverage of horizontal polarization of high and low frequencies is realized.
Referring to fig. 8, the reflection surface 4 is formed by bending and combining five metal plates with different lengths on a bell-shaped antenna base plate and a bell-shaped outline, the height of the metal plates is smaller than a quarter wavelength corresponding to the lowest working frequency band of the vehicle-mounted external antenna, the first antenna is arranged at the focal position in the metal reflection surface, the nearest distance between the second antenna and the metal reflection surface is a half wavelength corresponding to the central working frequency, and the high gain and low profile performance of the vehicle-mounted antenna can be realized.
Referring to fig. 9, an S-parameter curve of an embodiment of the high gain low profile low loss vehicle antenna of the present invention is shown. The operating band (S of the first antenna 11 <-10 dB) of 800-986MHz (186 MHz, 20.8%). The operating band (S of the second antenna 22 <-10 dB) is 1.6-3.0GHz (1.4 GHz, 60%), which respectively realize the coverage of low frequency band and high frequency band in the vertical polarization mode. Third antenna operating band (S) 33 <-10 dB) is 815-975MHz (160 MHz, 17.9%) and 1.45-3.00GHz (1.55 GHz, 69.7%), achieving simultaneous coverage for low and high frequency bands in horizontal polarization mode. For the first antenna and the second antenna with different frequency bands under the same polarization mode, the filtering feed network 8 is adopted, and the isolation between the first antenna and the second antenna is |S 21 The I is higher than 20dB in the high frequency band of 1.4-3.0GHz (1.6 GHz, 72.7%), and the I S in most frequency bands 21 The I value is even more than 25dB, so that the excellent high-pilot frequency decoupling effect of the filtering feed network in the vehicle-mounted antenna is reflected, and the high-pilot frequency isolation among different antennas can be realized without introducing an additional filtering circuit. The antennas with different polarization modes of the vehicle-mounted antenna have high isolation degree, and the isolation degree |S between the vertically polarized first antenna and the horizontally polarized third antenna 13 Isolation between the second and third antennas |S 23 The I is higher than 35dB at 0.6-3.0GHz (2.4 GHz, 133.3%).
To better illustrate the effect of the filter feed network in the vehicle-mounted antenna of the present invention, referring to FIG. 10, an S of the high-gain low-profile low-loss vehicle-mounted antenna of the present embodiment is shown with the filter feed network and the non-filter feed network in the first antenna 21 ，S 11 Comparison of curves. Simulated S when the filtered feed network is removed from the first antenna 11 The-10 dB frequency bands corresponding to the curves are 0.709-1.044GHz (0.335 GHz, 38.2%) and 2.57-3.00GHz (0.43 GHz, 15.4%), which shows that the vertical polarization low-frequency vibrator of the filter-free feed network generates stronger higher harmonic waves, which can generate serious interference to the second antenna. Isolation |S between first antenna and second antenna without filter feed network 21 The value of I is 1.4-3.0GHz (1.6 GHz, 72.7%) alreadyIs lower than 20dB, and even in the range of 1.08-1.36GHz (0.28 GHz,23.0 percent) 21 The I value is lower than 15dB, and the inter-port different-frequency isolation effect is obviously deteriorated.
Further, referring to fig. 11, a comparison of antenna gain curves of the high-gain low-profile low-loss vehicle antenna of the present embodiment is shown for the first antenna with and without the filtered feed network. In a vehicle-mounted antenna model without a filtering feed network, the gains of a first antenna at 1.8-2.8GHz (1.0 GHz, 43.5%) are all above 2.5 dBi; however, after the filter feed network is added, the gain of the first antenna is reduced to be below-2.5 dBi at 1.8-2.8GHz (1.0 GHz, 43.5%), and the suppression effect of the filter feed network on the higher harmonic of the frequency band vertical polarization low-frequency oscillator is remarkably shown.
Referring to fig. 12, a vertical polarization pattern of the first antenna at a frequency of 0.9GHz in the high-gain low-profile low-loss vehicle antenna according to the present embodiment is shown. The maximum radiation direction tilt angle of the first antenna is 32 deg., the maximum main lobe gain value is 7.8dBi, and the main lobe 3dB beam width is 72 deg.. The results indicate that the first antenna achieves signal coverage obliquely above the low frequency band in the vertical polarization mode.
Referring to fig. 13, fig. 13 a) shows a vertical polarization pattern of the second antenna at 1.8GHz in the gain low-profile low-loss vehicle antenna according to the present embodiment. The second antenna has a maximum radiation direction tilt angle of 67 deg. at 1.8GHz, a maximum main lobe gain value of 11.87dBi, and a main lobe 3dB beamwidth of 46 deg.. The higher gain value shows the effect of the bell-shaped bending metal reflecting surface on the second antenna at 1.8GHz, so that the gain of the antenna is improved. Fig. 13 b) shows a vertical polarization pattern of the second antenna at 2.7GHz in the high-gain low-profile low-loss vehicle antenna of the present embodiment. The second antenna has a maximum radiation direction tilt angle of 72 DEG at 2.7GHz, a maximum main lobe gain value of 14.79dBi, and a main lobe 3dB beam width of 40 deg. The higher gain value shows that the bell-shaped bent metal reflecting surface has the effect of improving the antenna gain for the second antenna at 2.7GHz. The results indicate that the second antenna achieves signal coverage in the vertical polarization mode for the high frequency band obliquely above and in the horizontal direction.
Referring to fig. 14, fig. 14 a) shows a horizontal polarization pattern of the third antenna at the frequency of 0.9GHz in the high-gain low-profile low-loss vehicle antenna according to the present embodiment. The third antenna has a maximum radiation direction tilt angle of 27 degrees at 0.9GHz, a maximum main lobe gain value of 7.9dBi, and a main lobe 3dB beam width of 78 degrees. Fig. 14 b) shows a horizontal polarization pattern at 1.8GHz for a third antenna in a high gain low profile low loss vehicle antenna embodiment of the present invention. The third antenna has a maximum radiation direction tilt angle of 50 degrees at 1.8GHz, a maximum main lobe gain value of 10.9dBi, and a main lobe 3dB beam width of 47 degrees. Fig. 14 c) shows a horizontal polarization pattern of the third antenna in the high-gain low-profile low-loss vehicle antenna of the present embodiment at a frequency of 2.7GHz. The third antenna has a maximum radiation direction tilt angle of 68 degrees at 2.7GHz, a maximum main lobe gain value of 12.4dBi, and a main lobe 3dB beam width of 37 degrees. It can be seen that as the frequency increases, the main lobe inclination angle degree of the third antenna gradually increases, so as to cover the direction diagram of the vehicle-mounted antenna emission direction; the higher gain value of the antenna covering high and low frequencies reflects the gain improvement effect of the metal reflecting surface and meets the high gain performance requirement of future vehicle-mounted antennas. The result shows that the third antenna realizes signal coverage of the high-low frequency band obliquely upwards and horizontally in the horizontal polarization mode.
The foregoing is a detailed description of specific embodiments provided for a high-profile, low-profile, miniaturized, on-board antenna based on filter element isolation of the present invention. The specific examples are presented herein to illustrate the design, principles and embodiments of the present invention and to aid in understanding the invention and its core ideas. The foregoing description is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, as any modification, equivalent replacement, improvement or the like which comes within the spirit and principles of the present invention.
Claims (8)
1. The low-profile miniaturized vehicle-mounted antenna based on high-different-frequency isolation of the filter oscillator is characterized by comprising a first antenna, a second antenna and a third antenna, wherein the first antenna comprises a vertical polarized low-frequency oscillator, the vertical polarized low-frequency oscillator is printed on a first dielectric substrate, the second antenna adopts a vertical polarized high-frequency oscillator, the third antenna is a horizontal polarized antenna covering high frequency and low frequency, and the vertical polarized first antenna, the vertical polarized second antenna and the horizontal polarized third antenna form a dual-frequency dual-polarized antenna; a filtering feed structure for realizing the suppression of higher harmonics thereof in a wide frequency band range is arranged on the first antenna;
the filtering feed network is formed by adopting open branch node lines loaded at two ends of a feed line and quarter-wavelength open slot lines etched on the surface of the feed line, and is printed at the bottom of the second medium substrate to realize the suppression of the high harmonic wave of 1.7-2.7GHz of the first antenna;
the open-circuit slot lines are two, the lengths are different, the open-circuit branch lines filter out the higher harmonic wave of about 1.8GHz, and the open-circuit slot lines with two different lengths filter out the higher harmonic wave in the frequency range of 2.1-2.7 GHz.
2. The low-profile miniaturized vehicle-mounted antenna of claim 1, wherein the vertically polarized low-frequency element is a "defect ellipsoid" type vertically polarized low-frequency element, and the height is one sixth wavelength of the center operating frequency of the first antenna.
3. The low-profile miniaturized vehicle-mounted antenna of claim 1, wherein the vertically polarized high-frequency element in the second antenna is a broadband "binary" vertically polarized high-frequency element, printed on a third dielectric substrate.
4. The low profile miniaturized vehicle-mounted antenna based on high-frequency-to-different isolation of the filter element of claim 1, wherein the first antenna operating frequency band is 825-960MHz and the second antenna operating frequency band is 1710-2690MHz.
5. The low-profile miniaturized vehicle-mounted antenna with high-frequency isolation based on the filter oscillator according to claim 1, wherein the third antenna is a printed type Vivaldi antenna, is printed on a fourth dielectric substrate, is horizontally placed, and has a height of one third wavelength of the central working frequency of the third antenna.
6. The low-profile miniaturized vehicle-mounted antenna based on high-different-frequency isolation of a filter oscillator according to claim 1, wherein a metal reflecting surface is arranged on the periphery of the first antenna, the second antenna and the third antenna, and the height of the metal reflecting surface is smaller than one quarter wavelength of the lowest working frequency band of the vehicle-mounted external antenna.
7. The low-profile miniaturized vehicle-mounted antenna with high-frequency isolation based on the filter oscillator according to claim 6, wherein the metal reflecting surface is a bell-shaped bent metal reflecting surface and is formed by bending and combining a bell-shaped antenna bottom plate and five metal plates with different lengths on a bell-shaped outline.
8. The low profile miniaturized vehicle-mounted antenna based on high-frequency isolation of the filter element of claim 6, wherein the first antenna is disposed at a focal position within a metallic reflective surface;
the nearest distance between the second antenna and the metal reflecting surface is a wavelength corresponding to half of the central working frequency.
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| CN108539385A (en) | 2018-09-14 |
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