CN103490151A - L-waveband broadband circular polarization micro-strip antenna - Google Patents
L-waveband broadband circular polarization micro-strip antenna Download PDFInfo
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Abstract
The invention discloses an L-waveband broadband circular polarization micro-strip antenna which comprises an upper-layer radiating antenna dielectric substrate and a lower-layer feed network dielectric substrate; a radiation patch is printed on the upper surface of the upper-layer radiating antenna dielectric substrate; four coupling patches are printed on the lower surface of the upper-layer radiating antenna dielectric substrate; an earth plate is arranged on the upper surface of the lower-layer feed network dielectric substrate, and a micro-strip power dividing phase-shifting feed network with one input end and four output ends is printed on the lower surface of the lower-layer feed network dielectric substrate; an air gap is formed between the upper-layer radiating antenna dielectric substrate and the lower-layer feed network dielectric substrate; each coupling patch is connected with one output end of the micro-strip power dividing phase-shifting feed network through a metal probe. The L-waveband broadband circular polarization micro-strip antenna is simple in structure, low in cost, easy to tune, wide in impedance bandwidth and circular polarization bandwidth and suitable for application to a maritime satellite communication system and a satellite positioning navigation system terminal.
Description
Technical field
The present invention relates to the antenna technology of wireless communication field, be specially a kind of L-band broadband circular polarization microstrip antenna.
Background technology
Broadband whole world local area network (LAN) (BGAN) be International Maritime Satellite Organization (INMARSAT) provide the 4th generation global mobile satellite communication system, it has drawn with compatibility the advantage of communicating by letter of 3G, combine the demand of portable mobile, broadband and network service in satellite communication, the revolutionary communication system that provides safe and reliable audio and video stream media transmission, Email, network insertion to serve to the user who moves arbitrarily in the world is provided, this system works is at L-band, and its reception and transmission frequency be correspondence 1525～1550MHz and 1626.5～1660.5MHz respectively.For antenna of transmit-receive sharing, the working band of antenna is designed to 1525～660.5MHz, relative bandwidth is 8.5%, antenna adopts the right-handed circular polarization form, because the loss that the circular polarization electromagnetic wave is introduced through misty rain layer and ionosphere the time is little.
Global positioning system (GPS) predecessor is a kind of Transit satellite navigation system of US military development, and through years development, this system has incorporated each application of the development of the national economy, national defense construction and social development.Global positioning system (GPS) can provide vehicle location, the monitoring of antitheft, travel route and call out the function such as commander, simultaneously alliance of Chinese Internet of Things school-run enterprise thinks that global positioning system (GPS) is by virtual reality, and that has realized most of article such as thing and thing, thing and people and network is connected, makes that article are convenient identifies, manages and control.Global positioning system (GPS) excellent performance has for many years in the past won the thousands of users' among the people in the whole world trust, and its reliability is obvious to all in the past, in future long-time, also will make global user be benefited.The L1 frequency range of global positioning system (GPS) navigation satellite framing signal is 1575.42MHz ± 1.02MHz, and antenna adopts right-handed circular polarization.
Microstrip antenna a series of outstanding advantages such as little, lightweight and cost is low with its volume in many antenna systems and to be subject to people's favor, development swift and violent.Microstrip antenna has occupied very important status in radio communication, radio-frequency (RF) identification, satellite communication, satellite navigation, commander and the various fields such as control system, biomedical radiator.Yet the impedance bandwidth that microstrip antenna is intrinsic and circular polarization bandwidth are narrower, typical frequency bandwidth is several to a few percent from percent zero point, has greatly limited its performance, therefore develops the broadband circular polarization microstrip antenna significant.
Summary of the invention
The present invention is directed to the proposition of above problem, and develop a kind of can compatible marisat system and the L-band broadband circular polarization microstrip antenna of NAVSTAR terminal applies.
Technological means of the present invention is as follows:
A kind of L-band broadband circular polarization microstrip antenna, comprise upper strata radiating antenna medium substrate and lower floor's feeding network medium substrate; The upper surface of described upper strata radiating antenna medium substrate is printed with radiation patch; Described radiation patch comprises antenna primary radiation paster and four parasitic radiation pasters that are symmetrically distributed in antenna primary radiation paster surrounding of a centering; The lower surface of described upper strata radiating antenna medium substrate is printed with four coupling pasters; The upper surface of described lower floor feeding network medium substrate is provided with ground plate, and the lower surface of this lower floor's feeding network medium substrate is printed with the micro-band merit with an input and four outputs and divides the phase shift feeding network; There is air gap between described upper strata radiating antenna medium substrate and described lower floor feeding network medium substrate; Each described coupling paster divides an output of phase shift feeding network to be connected with micro-with merit by a metal probe; Described micro-micro-band merit of a minute four of dividing the phase shift feeding network to adopt to consist of T-shaped power splitter with merit is divided the phase shift feeding network;
Further, described metal probe passes ground plate and insulate mutually with described ground plate; Be provided with the protection hole suitable with metal probe on described ground plate;
Further, described micro-input of phase shift feeding network that divides with merit connects sub-miniature A connector by 50 ohmage lines;
Further, described upper strata radiating antenna medium substrate and lower floor's feeding network medium substrate are parallel to each other, and are fixed together to keep by plastic screw the air gap had between upper strata radiating antenna medium substrate and described lower floor feeding network medium substrate;
Further, described micro-band merit divides the phase shift feeding network to comprise:
Characteristic impedance is the first microstrip line and the second microstrip line that 100 ohm and electrical length differ 90 degree;
Two identical quarter-wave microstrip line I, quarter-wave microstrip line II;
Two the 3rd identical microstrip lines and the 5th microstrip line;
Two the 4th identical microstrip lines and the 6th microstrip line; The electrical length that the electrical length that the characteristic impedance of described the 3rd microstrip line, the 4th microstrip line, the 5th microstrip line and the 6th microstrip line is 100 ohm and the 3rd microstrip line and the 4th microstrip line differs 180 degree, the 5th microstrip line and the 6th microstrip line differs 180 degree;
With two identical short circuit minor matters; Two described short circuit minor matters one ends connect respectively quarter-wave microstrip line I and quarter-wave microstrip line II, and the other end is connected with ground plate by the short circuit pin;
Described micro-signal that divides the phase shift feeding network to input by input A with merit be divided into the equal output signal of four road power; Input signal obtains having the first via output signal of 0 degree phase shift through input A, the first microstrip line, quarter-wave microstrip line I, the 3rd microstrip line and output B; Input signal obtains having the second tunnel output signal of 180 degree phase shifts through input A, the first microstrip line, quarter-wave microstrip line I, the 4th microstrip line and output C; Input signal obtains having the Third Road output signal of 90 degree phase shifts through input A, the second microstrip line, quarter-wave microstrip line II, the 5th microstrip line and output D; Input signal obtains having 270 degree phase shift tetra-tunnel output signals through input A, the second microstrip line, quarter-wave microstrip line II, the 6th microstrip line and output E;
Further, described radiation patch and micro-band merit are divided phase shift feeding network shared grounding plate; The characteristic impedance of described short circuit minor matters is 70.7 ohm;
Further, described upper strata radiating antenna medium substrate and lower floor's feeding network medium substrate employing thickness are that the microwave dielectric material that 2mm, dielectric constant are 2.65 is made;
Further, form distributed capacitance between described antenna primary radiation paster and described coupling paster, and be circular patch; Described parasitic radiation paster is circular-arc paster; Form fluting between adjacent two parasitic radiation pasters and antenna primary radiation paster; The circular polarization characteristics that L-band broadband circular polarization microstrip antenna is regulated in size, the position of size, position and fluting by changing the parasitic radiation paster;
Further, adjust the size of coupling paster according to the variation of described air gap.
Owing to having adopted technique scheme, a kind of L-band broadband circular polarization microstrip antenna provided by the invention, the antenna primary radiation paster and four the parasitic radiation pasters that are symmetrically distributed in antenna primary radiation paster surrounding that comprise a centering by radiation patch, broadening the circular polarization bandwidth of antenna; Adopt metal probe butt coupling paster and micro-output that divides the phase shift feeding network with merit, adjust the size of coupling paster according to the variation of described air gap, realized metal probe is introduced to the compensation that inductance and coupling paster are introduced electric capacity, broadening the impedance bandwidth of antenna; Micro-band merit is divided between phase shift feeding network and radiation patch and is separated by ground plate, has reduced the impact of the parasitic radiation of feeding network on antenna directivity, has improved the performance of antenna; Micro-band merit divides the phase shift feeding network to introduce the short circuit minor matters, has guaranteed that feeding network merit distribution phase-shift is accurate, further broadening impedance bandwidth and the circular polarization bandwidth of antenna; The present invention is simple in structure, cost is low, it is tuning to be easy to, have wide impedance bandwidth and circular polarization bandwidth, is applicable to the application of marisat system and NAVSTAR terminal.
The accompanying drawing explanation
Fig. 1 is the structural representation of microstrip antenna of the present invention;
Fig. 2 is the schematic top plan view of microstrip antenna of the present invention;
Fig. 3 is micro-structural representation that divides the phase shift feeding network with merit of the present invention;
Fig. 4 is micro-principle schematic of dividing the phase shift feeding network with merit of the present invention;
Fig. 5 is the curve chart of the reflection coefficient of microstrip antenna of the present invention with frequency change;
Fig. 6 is the curve chart of the zenith axis ratio of microstrip antenna of the present invention with frequency change.
In figure: 1, upper strata radiating antenna medium substrate, 2, lower floor's feeding network medium substrate, 3, plastic screw, 4, air gap, 5, metal probe, 6, sub-miniature A connector, 7, 50 ohmage lines, 11, antenna primary radiation paster, 12, the parasitic radiation paster, 13, the coupling paster, 14, fluting, 21, ground plate, 22, micro-band merit is divided the phase shift feeding network, 23, the short circuit pin, 211, the protection hole, 221, the first microstrip line, 222, quarter-wave microstrip line I, 223, the second microstrip line, 224, quarter-wave microstrip line II, 225, the 3rd microstrip line, 226, the 4th microstrip line, 227, the 5th microstrip line, 228, the 6th microstrip line, 229, output B, 230, output C, 231, output D, 232, output E, 233, the short circuit minor matters.
Embodiment
A kind of L-band broadband circular polarization microstrip antenna as shown in Figure 1, Figure 2, Figure 3 and Figure 4, is characterized in that comprising upper strata radiating antenna medium substrate 1 and lower floor's feeding network medium substrate 2; The upper surface of described upper strata radiating antenna medium substrate 1 is printed with radiation patch; Described radiation patch comprises antenna primary radiation paster 11 and four parasitic radiation pasters 12 that are symmetrically distributed in antenna primary radiation paster 11 surroundings of a centering; The lower surface of described upper strata radiating antenna medium substrate 1 is printed with four coupling pasters 13; The upper surface of described lower floor feeding network medium substrate 2 is provided with ground plate 21, and the lower surface of this lower floor's feeding network medium substrate 2 is printed with the micro-band merit with an input and four outputs and divides phase shift feeding network 22; There is air gap 4 between described upper strata radiating antenna medium substrate 1 and described lower floor feeding network medium substrate 2; Each described coupling paster 13 divides an output of phase shift feeding network 22 to be connected with micro-with merit by a metal probe 5; Describedly micro-ly with merit, divide phase shift feeding network 22 to adopt the micro-band merit of a minute four formed by T-shaped power splitter to divide phase shift feeding network 22; Further, described metal probe 5 passes ground plate 21 and insulate mutually with described ground plate 21; Be provided with the protection hole 211 suitable with metal probe 5 on described ground plate 21; Further, described micro-input of phase shift feeding network 22 that divides with merit connects sub-miniature A connector 6 by 50 ohmage lines 7; Further, described upper strata radiating antenna medium substrate 1 and lower floor's feeding network medium substrate 2 are parallel to each other, and are fixed together to keep by plastic screw 3 air gap 4 had between upper strata radiating antenna medium substrate 1 and described lower floor feeding network medium substrate 2; Further, described micro-band merit divides phase shift feeding network 22 to comprise: characteristic impedance is the first microstrip line 221 and the second microstrip line 223 that 100 ohm and electrical length differ 90 degree; Two identical quarter-wave microstrip line I 222, quarter-wave microstrip line II 224; Two the 3rd identical microstrip lines 225 and the 5th microstrip line 227; Two the 4th identical microstrip lines 226 and the 6th microstrip line 228; The electrical length that the electrical length that the characteristic impedance of described the 3rd microstrip line 225, the 4th microstrip line 226, the 5th microstrip line 227 and the 6th microstrip line 228 is 100 ohm and the 3rd microstrip line 225 and the 4th microstrip line 226 differs 180 degree, the 5th microstrip line 227 and the 6th microstrip line 228 differs 180 degree; With two identical short circuit minor matters 233; Two described short circuit minor matters 233 1 ends connect respectively quarter-wave microstrip line I 222 and quarter-wave microstrip line II 224, and the other end is connected with ground plate 21 by short circuit pin 23; Described micro-signal that divides phase shift feeding network 22 to input by input A with merit be divided into the equal output signal of four road power; Input signal obtains having the first via output signal of 0 degree phase shift through input A, the first microstrip line 221, quarter-wave microstrip line I 222, the 3rd microstrip line 225 and output B229; Input signal obtains having the second tunnel output signal of 180 degree phase shifts through input A, the first microstrip line 221, quarter-wave microstrip line I 222, the 4th microstrip line 226 and output C230; Input signal obtains having the Third Road output signal of 90 degree phase shifts through input A, the second microstrip line 223, quarter-wave microstrip line II 224, the 5th microstrip line 227 and output D231; Input signal obtains having 270 degree phase shift tetra-tunnel output signals through input A, the second microstrip line 223, quarter-wave microstrip line II 224, the 6th microstrip line 228 and output E232; Further, described radiation patch and micro-band merit divide the phase shift feeding network 22 shared grounding plates 21; The characteristic impedance of described short circuit minor matters 233 is 70.7 ohm; Further, described upper strata radiating antenna medium substrate 1 and lower floor's feeding network medium substrate 2 employing thickness are that the microwave dielectric material that 2mm, dielectric constant are 2.65 is made; Further, form distributed capacitance between described antenna primary radiation paster 11 and described coupling paster 13, and be circular patch; Described parasitic radiation paster 12 is circular-arc paster; Form fluting 14 between adjacent two parasitic radiation pasters 12 and antenna primary radiation paster 11; The circular polarization characteristics that L-band broadband circular polarization microstrip antenna is regulated in size, position by changing parasitic radiation paster 12 and slot 14 size, position; Further, adjust the size of coupling paster 13 according to the variation of described air gap 4.
L-band broadband circular polarization microstrip antenna of the present invention, wherein the radius of antenna primary radiation paster 11 can be 43mm, the arc length of four parasitic radiation pasters 12 can be 8.5mm, each parasitic radiation paster 12 can be 3.5mm with the distance of antenna primary radiation paster 11, the radius of metal probe 5 can be 1.45mm, the radius of coupling paster 13 can be 6.5mm, the height of air gap 4 can be 24mm, the present invention can adjust according to the variation of described air gap 4 size of coupling paster 13, when air gap becomes large, need suitably to increase the size of coupling paster, can also be by changing the size of parasitic radiation paster 12, position and 14 the size of slotting, the circular polarization characteristics of L-band broadband circular polarization microstrip antenna is regulated in position, this adjustment process obtains by the HFSS software emulation, parasitic radiation paster 12 is determined by HFSS software from the position of antenna primary radiation paster 11, keep parasitic radiation paster 12 apart from antenna primary radiation paster 11 invariant positions, parasitic radiation paster 12 becomes large, it is large that the circular polarization bandwidth becomes, the size of the fluting 14 formed between adjacent two parasitic radiation pasters 12 and antenna primary radiation paster 11 and position are all determined by HFSS software, when the arc length of four parasitic radiation pasters 12 is 8.5mm, when the distance of each parasitic radiation paster 12 and antenna primary radiation paster 11 is 3.5mm, the corresponding circular polarization bandwidth of size of the fluting 14 formed between adjacent two parasitic radiation pasters 12 and antenna primary radiation paster 11 is the widest, micro-ly with merit, divide the first microstrip line 221 of phase shift feeding network 22 and the characteristic impedance of the second microstrip line 223 to be 100 ohm and to differ 90 degree with respect to centre frequency 1600MHz electrical length, for realizing 90 degree phase shifts, the first microstrip line 221 and the second microstrip line 223 form quarter wavelength impedance transducer by the network of quarter-wave microstrip line I and quarter-wave microstrip line II and back respectively, realize impedance matching, the 3rd microstrip line 225, the 4th microstrip line 226, the electrical length that the characteristic impedance of the 5th microstrip line 227 and the 6th microstrip line 228 is 100 ohm and the 3rd microstrip line 225 and the 4th microstrip line 226 differs 180 degree, the electrical length of the 5th microstrip line 227 and the 6th microstrip line 228 differs 180 degree, for realizing 180 degree phase shifts, by micro-band merit, divide phase shift feeding network 22 to realize successively 0 degree, 90 degree, 180 degree, the phase shift of 270 degree, to realize right-handed circular polarization, by simulation calculation obtain the first microstrip line 221 electrical length at λ/8(with respect to centre frequency 1600MHz, electrical length is 45 degree) and the second microstrip line 223 electrical length when λ * 3/8, the merit of T-shaped power splitter divides bandwidth the widest, adding in addition the electrical length that characteristic impedance is 70.7 ohm is that λ/4(is with respect to centre frequency 1600MHz) short circuit minor matters 233, bandwidth in order to broadening merit proportion by subtraction, also improved the accuracy of phase shift simultaneously, the reflection coefficient of microstrip antenna of the present invention as shown in Figure 5 is with the curve chart of frequency change, and the input reflection coefficient of L-band broadband circular polarization microstrip antenna is at 1440MHz-1830MHz all lower than-15dB, and the input coupling of antenna is good, the zenith axis of microstrip antenna of the present invention as shown in Figure 6 is than the curve chart with frequency change, the zenith axis of L-band broadband circular polarization microstrip antenna meets axial ratio than at 1510MHz-1760MHz and is less than 3dB, the circular polarization Performance Ratio of antenna is better, antenna of the present invention gains and can reach 8dB on frequency range used, circular polarization microstrip antenna impedance bandwidth is wider, the frequency band range 1440MHz-1830MHz of return loss 15dB, relative bandwidth is 24%, and there is good circular polarization characteristics, zenith axis is than the frequency band range 1510MHz-1760MHz that is less than 3dB, relative bandwidth is 15%.A kind of L-band broadband circular polarization microstrip antenna provided by the invention, comprise antenna primary radiation paster and four parasitic radiation pasters that are symmetrically distributed in antenna primary radiation paster surrounding of a centering by radiation patch, broadening the circular polarization bandwidth of antenna; Adopt metal probe butt coupling paster and micro-output that divides the phase shift feeding network with merit, adjust the size of coupling paster according to the variation of described air gap, realized metal probe is introduced to the compensation that inductance and coupling paster are introduced electric capacity, broadening the impedance bandwidth of antenna; Micro-band merit is divided between phase shift feeding network and radiation patch and is separated by ground plate, has reduced the impact of the parasitic radiation of feeding network on antenna directivity, has improved the performance of antenna; Micro-band merit divides the phase shift feeding network to introduce the short circuit minor matters, has guaranteed that feeding network merit distribution phase-shift is accurate, further broadening impedance bandwidth and the circular polarization bandwidth of antenna; The present invention is simple in structure, cost is low, it is tuning to be easy to, have wide impedance bandwidth and circular polarization bandwidth, is applicable to the application of marisat system and NAVSTAR terminal.
The above; it is only preferably embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to replacement or changed according to technical scheme of the present invention and inventive concept thereof, within all should being encompassed in protection scope of the present invention.
Claims (9)
1. a L-band broadband circular polarization microstrip antenna, is characterized in that comprising upper strata radiating antenna medium substrate (1) and lower floor's feeding network medium substrate (2); The upper surface of described upper strata radiating antenna medium substrate (1) is printed with radiation patch; Described radiation patch comprises antenna primary radiation paster (11) and four parasitic radiation pasters (12) that are symmetrically distributed in antenna primary radiation paster (11) surrounding of a centering; The lower surface of described upper strata radiating antenna medium substrate (1) is printed with four coupling pasters (13); The upper surface of described lower floor's feeding network medium substrate (2) is provided with ground plate (21), and the lower surface of this lower floor's feeding network medium substrate (2) is printed with the micro-band merit with an input and four outputs and divides phase shift feeding network (22); There is air gap (4) between described upper strata radiating antenna medium substrate (1) and described lower floor's feeding network medium substrate (2); Each described coupling paster (13) divides an output of phase shift feeding network (22) to be connected by a metal probe (5) and micro-band merit; Described micro-band merit divides phase shift feeding network (22) to adopt the micro-band merit of a minute four consisted of T-shaped power splitter to divide phase shift feeding network (22).
2. a kind of L-band broadband circular polarization microstrip antenna according to claim 1, is characterized in that described metal probe (5) through ground plate (21) and insulate mutually with described ground plate (21); Be provided with the protection hole (211) suitable with metal probe (5) on described ground plate (21).
3. a kind of L-band broadband circular polarization microstrip antenna according to claim 1, is characterized in that described micro-band merit divides the input of phase shift feeding network (22) to connect sub-miniature A connectors (6) by 50 ohmage lines (7).
4. a kind of L-band broadband circular polarization microstrip antenna according to claim 1, it is characterized in that described upper strata radiating antenna medium substrate (1) and lower floor's feeding network medium substrate (2) are parallel to each other, and be fixed together to keep by plastic screw (3) air gap (4) had between upper strata radiating antenna medium substrate (1) and described lower floor's feeding network medium substrate (2).
5. a kind of L-band broadband circular polarization microstrip antenna according to claim 1 is characterized in that described micro-band merit divides phase shift feeding network (22) to comprise:
Characteristic impedance is the first microstrip line (221) and the second microstrip line (223) that 100 ohm and electrical length differ 90 degree;
Two identical quarter-wave microstrip line I (222), quarter-wave microstrip line II (224);
Two the 3rd identical microstrip lines (225) and the 5th microstrip line (227);
Two the 4th identical microstrip lines (226) and the 6th microstrip line (228); The characteristic impedance of described the 3rd microstrip line (225), the 4th microstrip line (226), the 5th microstrip line (227) and the 6th microstrip line (228) is that 100 ohm and the 3rd microstrip line (225) differ 180 degree with the electrical length of the 4th microstrip line (226), the 5th microstrip line (227) differs 180 degree with the electrical length of the 6th microstrip line (228);
With two identical short circuit minor matters (233); Two described short circuit minor matters (233) one ends connect respectively quarter-wave microstrip line I (222) and quarter-wave microstrip line II (224), and the other end is connected with ground plate (21) by short circuit pin (23);
Described micro-band merit divides phase shift feeding network (22) to be divided into the equal output signal of four road power by the signal of input A input; Input signal is through input A, the first microstrip line (221), quarter-wave microstrip line I (222), the 3rd microstrip line (225) and output B(229) obtain having the first via output signal of 0 degree phase shift; Input signal is through input A, the first microstrip line (221), quarter-wave microstrip line I (222), the 4th microstrip line (226) and output C(230) obtain having the second tunnel output signal of 180 degree phase shifts; Input signal is through input A, the second microstrip line (223), quarter-wave microstrip line II (224), the 5th microstrip line (227) and output D(231) obtain having the Third Road output signal of 90 degree phase shifts; Input signal is through input A, the second microstrip line (223), quarter-wave microstrip line II (224), the 6th microstrip line (228) and output E(232) obtain having 270 degree phase shift tetra-tunnel output signals.
6. a kind of L-band broadband circular polarization microstrip antenna according to claim 1, is characterized in that described radiation patch and micro-band merit divide phase shift feeding network (22) shared grounding plate (21); The characteristic impedance of described short circuit minor matters (233) is 70.7 ohm.
7. a kind of L-band broadband circular polarization microstrip antenna according to claim 1, is characterized in that it is that the microwave dielectric material that 2mm, dielectric constant are 2.65 is made that described upper strata radiating antenna medium substrate (1) and lower floor's feeding network medium substrate (2) adopt thickness.
8. a kind of L-band broadband circular polarization microstrip antenna according to claim 1, is characterized in that forming distributed capacitance between described antenna primary radiation paster (11) and described coupling paster (13), and be circular patch; Described parasitic radiation paster (12) is circular-arc paster; Form fluting (14) between adjacent two parasitic radiation pasters (12) and antenna primary radiation paster (11); The circular polarization characteristics that L-band broadband circular polarization microstrip antenna is regulated in size, the position of size, position and fluting (14) by changing parasitic radiation paster (12).
9. a kind of L-band broadband circular polarization microstrip antenna according to claim 1, is characterized in that adjusting according to the variation of described air gap (4) size of coupling paster (13).
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| CN114614261A (en) * | 2022-03-09 | 2022-06-10 | 中国电子科技集团公司第五十四研究所 | Terahertz circularly polarized directional diagram reconfigurable antenna based on MEMS switch |
| CN114614261B (en) * | 2022-03-09 | 2023-12-29 | 中国电子科技集团公司第五十四研究所 | Terahertz circular polarization pattern reconfigurable antenna based on MEMS switch |
| CN114639952A (en) * | 2022-05-17 | 2022-06-17 | 深圳华大北斗科技股份有限公司 | Omnidirectional circularly polarized antenna |
| CN115101930B (en) * | 2022-07-15 | 2022-11-15 | 广东工业大学 | Dual-frequency satellite navigation antenna with edge-loaded resonant branches |
| CN115101930A (en) * | 2022-07-15 | 2022-09-23 | 广东工业大学 | Dual-frequency satellite navigation antenna with edge-loaded resonant branches |
| CN115425411A (en) * | 2022-08-24 | 2022-12-02 | 华南理工大学 | Broadband multiport phase-shifting power-division feed network |
| CN116315649A (en) * | 2023-05-19 | 2023-06-23 | 陕西海积信息科技有限公司 | Small circularly polarized antenna |
| CN117691351A (en) * | 2024-02-01 | 2024-03-12 | 西南科技大学 | Broadband filtering circularly polarized antenna loaded with serial configuration filtering strips |
| CN117691351B (en) * | 2024-02-01 | 2024-05-14 | 西南科技大学 | Broadband filtering circularly polarized antenna loaded with serial configuration filtering strips |
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