CN104538733A - Log-periodic dipole antenna loaded with rectangular coupled resonators - Google Patents
Log-periodic dipole antenna loaded with rectangular coupled resonators Download PDFInfo
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Abstract
The invention belongs to the technical field of communication and particularly provides a log-periodic dipole antenna loaded with rectangular coupled resonators. The antenna comprises a pair of log-periodic dipole antenna arrays, a pair of rectangular coupled resonator arrays and an input port. The obverse side of a dielectric slab is provided with one log-periodic dipole array, one rectangular coupled resonator array and a ribbon feeder, wherein the rectangular coupled resonators correspond to dipoles on the reverse side of the dielectric slab in position to form coupled feeding. The reverse side of the dielectric slab is provided with the other log-periodic dipole array, the other rectangular coupled resonator array and a ribbon feeder, and the reverse side of the dielectric slab and the obverse side of the dielectric slab are distributed symmetrically in structure. The center of the dielectric slab is provided with a ribbon feeder. According to the log-periodic dipole antenna loaded with the rectangular coupled resonators, by loading a traditional log-periodic dipole antenna with the rectangular coupled resonator arrays, the advantages of widened frequency band, low cut-off frequency and compact size are achieved.
Description
Technical field
The invention belongs to communication technical field, be specifically related to a kind of logarithm period element antenna being loaded with new structure.
Background technology
Logarithm periodic antenna proposed in nineteen fifty-seven, was a kind of wide band frequency-independent antenna, and its basic thought is that antenna is by a certain scale factor
still equal its original structure after conversion, then the frequency of antenna is
with
shi Xingneng is identical.Because it has wider frequency band and simple structure, use widely so obtain rapidly in a lot of fields.
The main Types of logarithm periodic antenna has the form such as Log Periodic Dipole Antenna and unipole antenna, logarithm period resonance v antenna, logarithm period helical antenna, wherein the most generally Log Periodic Dipole Antenna.It may be used for point-to-point communication, also may be used for scientific and technological digital signal to measure, of many uses, such as cable TV antenna, receive radio signals, send the scientific and technological signal of digital base stations, and the effectiveness etc. of radiation measurement facility radar, also can be used as the broadcast transmitting antenna of short wave communication antenna and medium wave, shortwave.
The present invention carries out on the basis of traditional Log Periodic Dipole Antenna.
The current study hotspot structure mainly concentrated on by changing its low frequency end oscillator of Log Periodic Dipole Antenna increases bandwidth sum and reduces lower limiting frequency, and this is because the oscillator of Log Periodic Dipole Antenna is by a certain scale factor
become equal proportion to change, when cut-off frequency is lower, the size of antenna is comparatively large, brings inconvenience to processing and use.The shape and size of adjustment low frequency end oscillator improve its low frequency performance at present, expands the main method of bandwidth, such as rectangle, folding oscillator, triangle, or increase fluting or corner cut etc. on oscillator or feeder line.
The invention belongs to the new method of the research direction of being different from over.
Through finding the literature search of prior art, the patent " wide-band printing Diminishing Dimension of Log-Periodic Dipole Antenna " (CN104092011A) of the people such as the Fu Jiahui of Harbin Institute of Technology, the structure of oscillator changes into by this antenna
shape and chevron, to increase its electrical length; The people such as Dimitris E. Anagnostou are in the IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS(antenna of the 7th volume in 2008 and wireless transmission) on delivered " A Printed Log-Periodic Koch-Dipole Array (LPKDA) " (a kind of printed log-periodic antenna loading Ke Ke oscillator) "; the impedance bandwidth of this antenna covers 1.90-3.2GHz, decreases the area of antenna 17%.After deliberation, the shape of the method that they adopt all for a change antenna oscillator, and the method for loading new structure rectangle coupled resonators array in this paper (complementary split ring Complementary Split-Ring Resonator), expand bandwidth sum by the innovation mode of research different from the past and reduce volume, adopt herein traditional logarithm periodic antenna frequency band be 0.6-1.8GHz(3:1), after loading rectangle coupled resonators array, frequency band is 0.4-1.8GHz(4.5:1), wherein minimum cutoff by first to (maximum a pair) rectangle coupled resonators (5, 14) size determines, lowest resonant frequency formula is the (light velocity/[4 × (distance center distance+long+wide)], radiation in whole frequency domain is then by regulating the scale factor of rectangle coupled resonators array
realize.Meanwhile, further research in conjunction with the logarithm periodic antenna of non-traditional oscillator, the logarithm periodic antenna of Ke Ke oscillator such as, can load rectangle coupled resonators array, with in conjunction with the two advantage.
Summary of the invention
The object of the invention is, on the basis not changing logarithm periodic antenna design, a kind of rectangle coupled resonators loaded is provided, while the cut-off frequency reducing antenna, does not increase the volume of antenna, make it than the logarithm period element antenna originally having larger bandwidth.
The Log Periodic Dipole Antenna of bandwidth broadning provided by the invention, covering 0.4-1.8GHz frequency range, having less size (as being 300mm × 368mm) simultaneously.Structure of the present invention, based on traditional logarithm period element antenna, by loading rectangle coupled resonators array at the back side opposite position of often pair of logarithm period dipole element, reaching simultaneously and increasing the object that bandwidth sum does not increase volume.Specifically, the logarithm period element antenna of loading new structure provided by the invention, its structure as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5.Comprise a passive dielectric-slab 1, an input port 23, the front of described dielectric-slab 1 has: the first transmission line unit 25, first logarithm period layered transducer elements 4, first rectangle coupled resonators array 5,7,9,11,13,15,17,19,21, short circuit end line 3, wherein:
One end and the input port 23 of the first transmission line unit 25 connect, and the other end and short circuit end line 3 connect, and the first logarithm period layered transducer elements 4 and the first transmission line unit 25 connect; First logarithm period layered transducer elements 4 takes the design of traditional logarithm periodic antenna, and its length, width and spacing increase along with oscillator sequence number and reduce in proportion, and its scale factor is
; The symmetric position being centrally located at corresponding first logarithm period layered transducer elements 4 center of the first rectangle coupled resonators array 5,7,9,11,13,15,17,19,21, along with the shortening of logarithm period oscillator length, it is long and wide by geometric ratio shortening, its size constant in proportion
become geometric ratio change, this factor is the arithmetic square root of logarithm period oscillator, and its reason is for when resonance frequency is lower, and the resonance point bandwidth corresponding to often pair of oscillator is narrower, increases
antenna can be made at whole frequency domain interior resonance, and the distance of resonator array and the first transmission line unit 25 remains unchanged;
The reverse side of dielectric-slab 1 has: the second transmission line unit 24, second logarithm period layered transducer elements 2, second rectangle coupled resonators array 6,8,10,12,14,16,18,20,22, wherein:
Input port 23 and the second transmission line unit 24 connect, and the second logarithm period layered transducer elements 2 and the second transmission line unit 24 connect; Second logarithm period layered transducer elements 2 takes the design of traditional logarithm periodic antenna, and its size is identical with the first logarithm period layered transducer elements 4, position and the first logarithm period layered transducer elements 4 in a center of symmetry about the major axis of dielectric-slab 1; The size of the second rectangle coupled resonators array 6,8,10,12,14,16,18,20,22 and the first rectangle coupled resonators array 5,7,9,11,13,15,17,19,21 identical, position and the first rectangle coupled resonators array 5,7,9,11,13,15,17,19,21 in a center of symmetry about the major axis of dielectric-slab 1;
The center of dielectric-slab 1 has one end of the 3rd transmission line unit the 26, three transmission line unit 26 and input port 23 to connect, and the other end and short circuit end line 3 connect;
Input port 23 respectively with the first transmission line unit 24, second transmission line unit 25, the 3rd transmission line unit 26 are connected, wherein the signal end of input port 23 is connected with the 3rd transmission line unit 26, and the ground of input port 23 is connected with the first transmission line unit 24, second transmission line unit 25; Two ends respectively with the first transmission line unit 24 of short circuit end line 3 is connected with the 3rd transmission line unit 26; First rectangle coupled resonators array 5,7,9,11,13,15,17,19,21 and second logarithm period layered transducer elements 2 is positioned at the same position of dielectric-slab 1 positive and negative; Second rectangle coupled resonators array 6,8,10,12,14,16,18,20,22 and first logarithm period layered transducer elements 4 is positioned at the same position of dielectric-slab 1 positive and negative.
First rectangle coupled resonators array 5,7,9,11,13,15,17,19,21 and second rectangle coupled resonators array 6,8,10,12,14,16,18,20,22, wherein the structure of each unit is identical, and according to sequence number, its size is by a proportionality constant
become geometric ratio change; For rectangle coupled resonators array 5, obtain by etching C shape line of rabbet joint unit the 28, a 2nd C shape line of rabbet joint unit 29 on rectangle resonance piece unit 27.
In the present invention, the first described rectangle coupled resonators array 5,7,9,11,13,15,17,19,21 is all adjustable with the position of relative first transmission line unit 24, second transmission line unit 25 with the size of the second rectangle coupled resonators array 6,8,10,12,14,16,18,20,22; In the structure of the first described rectangle coupled resonators array 5,7,9,11,13,15,17,19,21 and second rectangle coupled resonators array 6,8,10,12,14,16,18,20,22, the length of the one C shape line of rabbet joint unit 28 and the 2nd C shape line of rabbet joint unit 29 and wide all adjustable, and the length of a C shape line of rabbet joint unit 28 and the wide length that should be greater than the 2nd C shape line of rabbet joint unit 29 respectively and wide, the line of rabbet joint width of the two should be identical, line of rabbet joint width-adjustable.
In the present invention, the rectangle resonance piece unit 27 in described short circuit end line 3, first logarithm period layered transducer elements 4, second logarithm period layered transducer elements 2, first transmission line unit 25, second transmission line unit 24, the 3rd transmission line unit 26 and the first rectangle coupled resonators array 5,7,9,11,13,15,17,19,21, second rectangle coupled resonators array 6,8,10,12,14,16,18,20,22 is conductor.
In the present invention, a described C shape line of rabbet joint unit 28 and the 2nd C shape line of rabbet joint unit 29 are all that etching removes corresponding seam shape on the first rectangle coupled resonators array 5,7,9,11,13,15,17,19,21, second rectangle coupled resonators array 6,8,10,12,14,16,18,20,22, and the air element structure formed.
In the present invention, described input port unit 23 outer signal source, additional pumping signal is by the 3rd transmission line unit 26, short circuit end line 3, first transmission line unit 25, second transmission line unit 24, first logarithm period layered transducer elements 4, second logarithm period layered transducer elements 2, again by the first logarithm period layered transducer elements 4, second logarithm period layered transducer elements 2 and the first rectangle coupled resonators array 5, 7, 9, 11, 13, 15, 17, 19, 21, second rectangle coupled resonators array 6, 8, 10, 12, 14, 16, 18, 20, the coupling of 22, realize the feed to antenna, by adjusting the 3rd transmission line unit 26, short circuit end line 3, first transmission line unit 25, second transmission line unit 24, first logarithm period layered transducer elements 4, the size of the second logarithm period layered transducer elements 2, and the first logarithm period layered transducer elements 4, second logarithm period layered transducer elements 2 and the first rectangle coupled resonators array 5, 7, 9, 11, 13, 15, 17, 19, 21, second rectangle coupled resonators array 6, 8, 10, 12, 14, 16, 18, 20, the size of 22 and position and both relative positions and shape, realize expanding its low frequency bandwidth, reduce the object of cut-off frequency and compression volume.
In the present invention, the first described transmission line unit 25, second transmission line unit 24, the 3rd transmission line unit 26 are all 50
uniform transmission line.
In the present invention, described dielectric-slab 1, its dielectric constant is 4.4, and thickness is 2.4mm.
The present invention loads rectangle coupled resonators array on traditional logarithm periodic antenna, compared with traditional logarithm period dipole, by loading resonator, with coupling feed way, improve the utilance of vacant area in traditional logarithm periodic antenna, thus add bandwidth; Rectangle resonator provides longer current path, and compared with traditional, under same size, have lower cut-off frequency, namely during identical cut-off frequency, size is less.Traditional antenna realizes broadband performance by the logarithm of careful adjustment dipole element, position and scale factor, on this basis, the present invention is by the relative position of the size of careful adjustment rectangle coupled resonators array and position and they and logarithm dipole antenna, larger bandwidth (0.4-1.8GHz can be realized, i.e. 4.5 octaves) and lower cut-off frequency, or have less size when same band, as a comparison, prototype antenna is when same size, and minimum cutoff is 0.6GHZ.
Accompanying drawing explanation
Fig. 1 is that the present invention loads the overall structural representation of the logarithm period element antenna of new structure.
Fig. 2 is the inverse layer structure schematic diagram that the present invention loads the logarithm period element antenna of new structure.
Fig. 3 is the Facad structure schematic diagram that the present invention loads the logarithm period element antenna of new structure.
Fig. 4 is the division center schematic diagram that the present invention loads the logarithm period element antenna of new structure.
Fig. 5 is the rectangle coupled resonators schematic diagram that the present invention loads the logarithm period element antenna of new structure.
Fig. 6 is the frequency characteristic schematic diagram that the present invention loads the logarithm period element antenna emulation of new structure.
Fig. 7 is the H face directional diagram schematic diagram that the present invention loads the logarithm period element antenna emulation of new structure.
Fig. 8 is the E face directional diagram schematic diagram that the present invention loads the logarithm period element antenna emulation of new structure.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated: the present embodiment is implemented under premised on technical solution of the present invention, give detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the present embodiment comprises: a passive dielectric-slab 1, an input port 23, input port is connected with center with the front of dielectric-slab, reverse side respectively, wherein the center of dielectric-slab is connected with the signal of input port, and the positive and negative of dielectric-slab are connected with the ground of input port.
As shown in Figure 2, the front of the dielectric-slab 1 described in the present embodiment has: the first transmission line unit 25, first logarithm period layered transducer elements 4, first rectangle coupled resonators array 5,7,9,11,13,15,17,19,21, short circuit end line 3.One end and the input port 23 of the first transmission line unit 25 connect, and the other end and short circuit end line 3 connect, and the first logarithm period layered transducer elements 4 and the first transmission line unit 25 connect; First logarithm period layered transducer elements 4 takes the design of traditional logarithm periodic antenna, and its length, width and spacing increase along with oscillator sequence number and reduce in proportion, and its scale factor is
; The symmetric position being centrally located at corresponding first logarithm period layered transducer elements 4 center of the first rectangle coupled resonators array 5,7,9,11,13,15,17,19,21, along with the shortening of logarithm period oscillator length, it is long and wide by geometric ratio shortening, and its scale factor is
, this factor is the arithmetic square root of logarithm period oscillator, and its reason is for when resonance frequency is lower, and the resonance point bandwidth corresponding to often pair of oscillator is narrower, increases
antenna can be made at whole frequency domain interior resonance, and the distance of resonator array and the first transmission line unit 25 remains unchanged.
As shown in Figure 3, the reverse side of the dielectric-slab 1 described in the present embodiment has: the second transmission line unit 24, second logarithm period layered transducer elements 2, second rectangle coupled resonators array 6,8,10,12,14,16,18,20,22.Input port 23 and the second transmission line unit 24 connect, and the second logarithm period layered transducer elements 2 and the second transmission line unit 24 connect; Second logarithm period layered transducer elements 2 takes the design of traditional logarithm periodic antenna, and its size is identical with the first logarithm period layered transducer elements 4, position and the first logarithm period layered transducer elements 4 in a center of symmetry about the major axis of dielectric-slab 1; The size of the second rectangle coupled resonators array 6,8,10,12,14,16,18,20,22 and the first rectangle coupled resonators array 5,7,9,11,13,15,17,19,21 identical, position and the first rectangle coupled resonators array 5,7,9,11,13,15,17,19,21 in a center of symmetry about the major axis of dielectric-slab 1.
As shown in Figure 4, the center of the dielectric-slab 1 described in the present embodiment has one end of the 3rd transmission line unit the 26, three transmission line unit 26 and input port 23 to connect, and the other end and short circuit end line 3 connect.
As shown in Figure 5, the first rectangle coupled resonators array 5,7,9,11,13,15,17,19,21 and second rectangle coupled resonators array 6,8,10,12,14,16,18,20,22 described in the present embodiment, wherein the structure of each unit is identical, according to sequence number, its size is by a proportionality constant
become geometric ratio change; For rectangle coupled resonators array 5, obtain by etching C shape line of rabbet joint unit the 28, a 2nd C shape line of rabbet joint unit 29 on rectangle resonance piece unit 27.
Dielectric-slab 1 and the first logarithm period layered transducer elements 4, second logarithm period layered transducer elements 2 increase first, second rectangle coupled resonators array, the size of first, second rectangle coupled resonators array, position and shape are all adjustable, and first, second rectangle coupled resonators array is innovative point of the present invention by the mode feed of coupling.
Rectangle resonance piece unit 27 in described short circuit end line 3, first logarithm period layered transducer elements 4, second logarithm period layered transducer elements 2, first transmission line unit 25, second transmission line unit 24, the 3rd transmission line unit 26 and the first rectangle coupled resonators array 5,7,9,11,13,15,17,19,21, second rectangle coupled resonators array 6,8,10,12,14,16,18,20,22 is conductor.
A described C shape line of rabbet joint unit 28 and the 2nd C shape line of rabbet joint unit 29 are all that etching removes corresponding seam shape on the first rectangle coupled resonators array 5,7,9,11,13,15,17,19,21, second rectangle coupled resonators array 6,8,10,12,14,16,18,20,22, and the air element structure formed.
The first described transmission line unit 25, second transmission line unit 24, the 3rd transmission line unit 26 are all 50
uniform transmission line.
Described dielectric-slab 1, its dielectric constant is 4.4, and thickness is 2.4mm.
Input port unit 23 outer signal source described in the present embodiment, additional pumping signal is by the 3rd transmission line unit 26, short circuit end line 3, first transmission line unit 25, second transmission line unit 24, first logarithm period layered transducer elements 4, second logarithm period layered transducer elements 2, again by the first logarithm period layered transducer elements 4, second logarithm period layered transducer elements 2 and the first rectangle coupled resonators array 5, 7, 9, 11, 13, 15, 17, 19, 21, second rectangle coupled resonators array 6, 8, 10, 12, 14, 16, 18, 20, the coupling of 22, realize the feed to antenna.By adjusting the 3rd transmission line unit 26, short circuit end line 3, first transmission line unit 25, second transmission line unit 24, first logarithm period layered transducer elements 4, the size of the second logarithm period layered transducer elements 2, and the first logarithm period layered transducer elements 4, second logarithm period layered transducer elements 2 and the first rectangle coupled resonators array 5, 7, 9, 11, 13, 15, 17, 19, 21, second rectangle coupled resonators array 6, 8, 10, 12, 14, 16, 18, 20, the size of 22 and position and both relative positions and shape, realize expanding its low frequency bandwidth, reduce the object of cut-off frequency and compression volume.
As shown in Figure 6, be the return loss of the present embodiment.Wherein abscissa represents frequency variable, and unit is GHz; Ordinate represents return loss variable, and unit is dB.The passband of new antenna of the present invention is 0.4-1.8GHz, and return loss is less than-10dB in passband, has the directional characteristic identical with traditional logarithm periodic antenna, and antenna size is 300mm × 368mm.
As shown in Figure 7, be the present embodiment H face normalization polar coordinates directional diagram.
As shown in Figure 8, be the present embodiment E face normalization polar coordinates directional diagram.
Claims (8)
1. load a logarithm period element antenna for rectangle coupled resonators, comprise a passive dielectric-slab, an input port, is characterized in that,
The front of described dielectric-slab has: the first transmission line unit, the first logarithm period layered transducer elements, the first rectangle coupled resonators array, short circuit end line, wherein:
One end and the input port of the first transmission line unit connect, and the other end and short circuit end line connect, and the first logarithm period layered transducer elements and the first transmission line unit connect; First logarithm period layered transducer elements 4 takes the design of traditional logarithm periodic antenna, and its length, width and spacing increase along with oscillator sequence number and reduce in proportion; The symmetric position being centrally located at corresponding first logarithm period layered transducer elements 4 center of the first rectangle coupled resonators array, along with the shortening of logarithm period oscillator length, it is long and wide by geometric ratio shortening, and this factor is the arithmetic square root of logarithm period oscillator;
The reverse side of dielectric-slab has: the second transmission line unit 24, second logarithm period layered transducer elements, the second rectangle coupled resonators array, wherein:
Input port and the second transmission line unit connect, and the second logarithm period layered transducer elements and the second transmission line unit connect; Second logarithm period layered transducer elements takes the design of traditional logarithm periodic antenna, and its size is identical with the first logarithm period layered transducer elements, position and the first logarithm period layered transducer elements in a center of symmetry about the major axis of dielectric-slab; The size of the second rectangle coupled resonators array is identical with the first rectangle coupled resonators array, position and the first rectangle coupled resonators array in a center of symmetry about the major axis of dielectric-slab;
There is the 3rd transmission line unit at the center of dielectric-slab, and one end and the input port of the 3rd transmission line unit connect, and the other end and short circuit end line connect;
Input port respectively with the first transmission line unit, the second transmission line unit, the 3rd transmission line unit are connected, and wherein the signal end of input port is connected with the 3rd transmission line unit, and the ground of input port is connected with the first transmission line unit, the second transmission line unit; Two ends respectively with the first transmission line unit of short circuit end line is connected with the 3rd transmission line unit; First rectangle coupled resonators array and the second logarithm period layered transducer elements are positioned at the same position of dielectric-slab positive and negative; Second rectangle coupled resonators array and the first logarithm period layered transducer elements are positioned at the same position of dielectric-slab positive and negative.
2. logarithm period element antenna according to claim 1, is characterized in that:
Described first rectangle coupled resonators array and the second rectangle coupled resonators array, wherein the structure of each unit is identical, and according to sequence number, its size is by a proportionality constant
become geometric ratio change; Each coupled resonators in rectangle coupled resonators array, by etching a C shape line of rabbet joint unit on this rectangle resonance piece unit, the 2nd C shape line of rabbet joint unit obtains.
3. logarithm period element antenna according to claim 2, is characterized in that:
The first described rectangle coupled resonators array is all adjustable with the position of relative first transmission line unit, the second transmission line unit with the size of the second rectangle coupled resonators array; In the structure of the first described rectangle coupled resonators array and the second rectangle coupled resonators array, the length of the one C shape line of rabbet joint unit and the 2nd C shape line of rabbet joint unit and wide all adjustable, and the length of a C shape line of rabbet joint unit and the wide length that should be greater than the 2nd C shape line of rabbet joint unit respectively and wide, the line of rabbet joint width of the two should be identical, line of rabbet joint width-adjustable.
4. the logarithm period element antenna according to claim 1,2 or 3, is characterized in that:
Rectangle resonance piece unit in described short circuit end line, the first logarithm period layered transducer elements, the second logarithm period layered transducer elements, the first transmission line unit, the second transmission line unit, the 3rd transmission line unit and the first rectangle coupled resonators array, the second rectangle coupled resonators array is conductor.
5. logarithm period element antenna according to claim 3, is characterized in that:
A described C shape line of rabbet joint unit and the 2nd C shape line of rabbet joint unit are all that etching removes corresponding seam shape on the first rectangle coupled resonators array, the second rectangle coupled resonators array, and the air element structure formed.
6., according to the logarithm period element antenna one of claim 1-5 Suo Shu, it is characterized in that:
Described input port unit outer signal source, additional pumping signal is by the 3rd transmission line unit, short circuit end line, first transmission line unit, the second transmission line unit, the first logarithm period layered transducer elements, the second logarithm period layered transducer elements, again by the first logarithm period layered transducer elements, the second logarithm period layered transducer elements and the first rectangle coupled resonators array, being coupled of the second rectangle coupled resonators array, realize the feed to antenna; By adjusting the 3rd transmission line unit, short circuit end line, the size of the first transmission line unit, the second transmission line unit, the first logarithm period layered transducer elements, the second logarithm period layered transducer elements, and the first logarithm period layered transducer elements, the second logarithm period layered transducer elements and the first rectangle coupled resonators array, the size of the second rectangle coupled resonators array and position and both relative positions and shape, the object realize expanding its low frequency bandwidth, reducing cut-off frequency and compression volume.
7. according to the logarithm period element antenna one of claim 1-5 Suo Shu, it is characterized in that: the first described transmission line unit, the second transmission line unit, the 3rd transmission line unit are all 50
uniform transmission line.
8. the logarithm period element antenna according to one of claim-5 1, is characterized in that, described dielectric-slab, and its dielectric constant is 4.4, and thickness is 2.4mm.
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| CN105206927B (en) * | 2015-09-06 | 2018-03-30 | 哈尔滨工业大学 | Printed form monopole folded dipole log-periodic antenna |
| CN105655697A (en) * | 2016-01-05 | 2016-06-08 | 上海交通大学 | Novel broadband microstrip log-periodic antenna array |
| CN105655697B (en) * | 2016-01-05 | 2018-12-18 | 上海交通大学 | Wideband micro-strip Log Periodic Array Antenna |
| CN111755807A (en) * | 2020-05-20 | 2020-10-09 | 南京邮电大学 | Equiangular spiral-based frequency scanning log-periodic antenna |
| CN111755807B (en) * | 2020-05-20 | 2022-06-03 | 南京邮电大学 | Equiangular spiral-based frequency scanning log-periodic antenna |
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| CN104538733B (en) | 2017-07-07 |
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