CN218919275U

CN218919275U - Quadrifilar helix antenna and communication device

Info

Publication number: CN218919275U
Application number: CN202221865607.2U
Authority: CN
Inventors: 王雷; 陈熙
Original assignee: Ecoflow Technology Ltd
Current assignee: Ecoflow Technology Ltd
Priority date: 2022-07-18
Filing date: 2022-07-18
Publication date: 2023-04-25
Anticipated expiration: 2032-07-18

Abstract

The application provides a quadrifilar helix antenna and a communications device. The four-arm spiral antenna comprises a hollow cylindrical carrier and four spiral arm groups with the same structure; the four spiral arm groups are wound on the side surface of the hollow cylindrical carrier and distributed at equal intervals along the side surface of the hollow cylindrical carrier; the spiral arm group comprises a first spiral arm and a second spiral arm, the lengths of the first spiral arm and the second spiral arm are different, and the first spiral arm and the second spiral arm are electrically connected through a metal strip; the bottom end of the first spiral arm is used for being connected with a grounding end, and the bottom end of the second spiral arm is used for being connected with a feed end. In this embodiment, the space on the side of the hollow cylindrical carrier is fully utilized to reduce the size of the antenna, and simultaneously, the dual-frequency signal can be received, and the working bandwidth of the antenna is widened by coupling between the spiral arm of the grounding end and the spiral arm connected with the feed-line end in each group of spiral arms.

Description

Quadrifilar helix antenna and communication device

Technical Field

The present application relates to the field of antennas, and in particular, to a quadrifilar helix antenna and a communication device.

Background

In the field of wireless communications, satellite communication systems are widely used in all respects. Currently, an RTK (Real Time Kinematic, real-time kinematic) antenna is used for receiving satellite signals, and since satellite signals are transmitted in circularly polarized waves, the RTK antenna is also referred to as a circularly polarized antenna.

If the RTK antenna is to transmit satellite signals of at least two frequency bands by different positioning systems, for example, to receive signals transmitted by two systems, namely, the beidou satellite system and the GPS (Global Positioning System ), at least two frequency band satellite signals need to be supported for reception, and the existing RTK antenna supporting dual-frequency band signal reception has the problems of larger size and lower bandwidth.

Disclosure of Invention

The main purpose of the application is to provide a four-arm spiral antenna and communication equipment, and aims to solve the problems of larger size and lower bandwidth of the existing RTK antenna.

In a first aspect, the present application provides a quadrifilar helix antenna comprising a hollow cylindrical carrier and four sets of structurally identical helical arms;

the four spiral arm groups are wound on the side surface of the hollow cylindrical carrier and distributed at equal intervals along the side surface of the hollow cylindrical carrier;

the spiral arm group comprises a first spiral arm and a second spiral arm, the lengths of the first spiral arm and the second spiral arm are different, and the first spiral arm and the second spiral arm are electrically connected through a metal strip;

the bottom end of the first spiral arm is used for being connected with a grounding end, and the bottom end of the second spiral arm is used for being connected with a feed end.

In one embodiment, the metal strip is connected between the bottom end of the first spiral arm and the bottom end of the second spiral arm.

In one embodiment, the resonant frequency of the first spiral arm is between 1.2GHz and 1.25GHz, and the resonant frequency of the second spiral arm is between 1.55GHz and 1.61 GHz.

In one embodiment, the first spiral arm comprises a first radiating section and a second radiating section, the second radiating section comprising two parallel first and second arms, the first and second arms extending from the ends of the first radiating section to the top end of the hollow cylindrical carrier, respectively.

In one embodiment, the second spiral arm comprises a first radiating section and a second radiating section, the second radiating section comprising two parallel first and second arms, the first and second arms extending from the ends of the first radiating section to the top end of the hollow cylindrical carrier, respectively.

In an embodiment, the lengths of the first support arm and the second support arm are respectively 0.1-0.2 times of the corresponding wavelength of the resonant frequency center frequency of the first spiral arm.

In an embodiment, the lengths of the first support arm and the second support arm are respectively 0.1-0.2 times of the corresponding wavelength of the resonance frequency center frequency of the second spiral arm.

In a second aspect, the present application provides a communications device comprising a quadrifilar helix antenna as described above.

In an embodiment, the communication device further includes a feeding network and four feeding terminals, where the feeding terminals are four input ports of the feeding network, and the four sets of spiral arms are further configured to receive radio frequency signals and input to the feeding network through corresponding feeding terminals.

In an embodiment, the feeding network includes a phase shifting unit, a first signal amplifying unit, a first power distribution unit, a filtering unit, a second power distribution unit, and a second signal amplifying unit, which are sequentially connected, wherein:

the phase shifting unit is used for carrying out phase shifting treatment on the radio frequency signals received by the four spiral arm groups and having different phases so as to obtain a synthesized first radio frequency signal;

the first signal amplifying unit is used for amplifying the first radio frequency signal;

the first power distribution unit is used for carrying out signal separation on the radio frequency signals output by the first signal amplification unit to obtain a second radio frequency signal and a third radio frequency signal;

the filtering unit comprises a first band-pass filter and a second band-pass filter, the first band-pass filter is used for filtering the second radio-frequency signal to obtain a fourth radio-frequency signal, the second band-pass filter is used for filtering the third radio-frequency signal to obtain a fifth radio-frequency signal, and the frequencies of the fourth radio-frequency signal and the fifth radio-frequency signal are different;

the second power distribution unit is used for carrying out signal synthesis on the fourth radio frequency signal and the fifth radio frequency signal to obtain a synthesized sixth radio frequency signal;

the second signal amplifying unit is used for amplifying the sixth radio frequency signal and outputting the amplified sixth radio frequency signal.

The application provides a quadrifilar helix antenna and a communications device. The four-arm spiral antenna comprises a hollow cylindrical carrier and four spiral arm groups with the same structure; the four spiral arm groups are wound on the side surface of the hollow cylindrical carrier and distributed at equal intervals along the side surface of the hollow cylindrical carrier; the spiral arm group comprises a first spiral arm and a second spiral arm, the lengths of the first spiral arm and the second spiral arm are different, and the first spiral arm and the second spiral arm are electrically connected through a metal strip; the bottom end of the first spiral arm is used for being connected with a grounding end, and the bottom end of the second spiral arm is used for being connected with a feed end. According to the embodiment, four groups of spiral arms are arranged on the side face of the hollow cylindrical carrier, two spiral arms with different lengths in each group of spiral arms are respectively connected with the corresponding feed end and the corresponding grounding end, the space on the side face of the hollow cylindrical carrier is fully utilized to reduce the size of the antenna, and meanwhile, a dual-band signal can be received and is coupled with the spiral arms connected with the feed end through the spiral arms of the grounding end in each group of spiral arms, so that the working bandwidth of the antenna is widened.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a quadrifilar helix antenna according to an embodiment of the present application;

fig. 2 is a schematic diagram of a structure of a four-arm helical antenna according to an embodiment of the present application;

FIG. 3 is a schematic side-expanded view of a hollow cylindrical carrier provided in an embodiment of the present application;

fig. 4 is a schematic structural diagram of a quadrifilar helix antenna according to an embodiment of the present application;

FIG. 5 is a schematic side-expanded view of a hollow cylindrical carrier provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of a quadrifilar helix antenna according to an embodiment of the present application;

FIG. 7 is a schematic side-on view of a hollow cylindrical carrier provided in an embodiment of the present application;

fig. 8 is a schematic diagram of a feed network structure provided in an embodiment of the present application;

fig. 9 is a return loss diagram of a quadrifilar helix antenna provided in an embodiment of the present application;

fig. 10 is a diagram of a quadrifilar helix antenna according to an embodiment of the present application at 1600 MHz;

fig. 11 is a diagram of a quadrifilar helix antenna according to an embodiment of the present application at a frequency of 1205 MHz.

Reference numerals:

100-four-arm helical antenna 200-circuit board 110-hollow cylindrical carrier 120-helical arm 121-first helical arm 123-second helical arm

130-feed end 140-ground end 300-feed network

301-phase shifting unit 302-first signal amplifying unit 303-first power dividing unit 304-filtering unit 305-second power dividing unit 306-second signal amplifying unit

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

In one embodiment, as shown in fig. 1, a schematic structural diagram of a four-arm helical arm antenna 100 is provided. The four-arm spiral antenna 100 is disposed on the circuit board 200, wherein the four-arm spiral antenna 100 includes a hollow cylindrical carrier 110 and four groups of spiral arms 120 with the same structure. Each set of spiral arms 120 includes a first spiral arm 121 and a second spiral arm 123.

Specifically, the hollow cylindrical carrier 110 is disposed on the circuit board 200, four sets of spiral arms 120 are wound around the side of the hollow cylindrical carrier 110, and the intervals between the spiral arms 120 of each set are the same, i.e., each set of spiral arms 120 is equally spaced along the side of the hollow cylindrical carrier 110; the first spiral arm 121 and the second spiral arm 123 of each set of spiral arms 120 are different in length, and the first spiral arm 131 and the second spiral arm 133 of each set of spiral arms 130 are electrically connected through a metal strip. Specifically, reference may be made to fig. 2, which is an exploded view of the quadrifilar helix antenna 100 in this embodiment.

It can be understood that the length of the first spiral arm 121 in this embodiment may be longer than the length of the second spiral arm 123, or may be shorter than the length of the second spiral arm 123, and when the shorter spiral arm resonates with the longer spiral arm, the shorter spiral arm is used to generate high-frequency resonance, and the longer spiral arm is used to generate low-frequency resonance, so that the four-arm spiral antenna 100 may respectively radiate electromagnetic wave signals with different resonant frequencies through spiral arms with different lengths, thereby supporting dual-band satellite signal reception.

In addition, four feeding terminals 130 and four grounding terminals 140 are disposed on the circuit board 200 corresponding to the four sets of spiral arms 120. The bottom end of one spiral arm of each group of spiral arms 120 is connected with a corresponding grounding end 140, the bottom end of the other spiral arm is connected with a corresponding feeding end 130, and the feeding end 130 is used for feeding electromagnetic wave signals with different frequencies to the connected spiral arms. Specifically, as shown in fig. 1, a first spiral arm 121 of one group of spiral arms 120 is connected to the feeding end 130, and a second spiral arm 123 of the same group is connected to the grounding end 140, and vice versa. It should be understood that, in this embodiment, four sets of spiral arms 130 are included, where the first spiral arm 131 and the second spiral arm 133 in each set of spiral arms 130 are the same for connecting to the feeding end or the grounding end, that is, if the bottom end of the first spiral arm 121 in one set is used for connecting to the grounding end 140, the bottom end of the second spiral arm 123 is used for connecting to the feeding end 130, the bottom ends of the first spiral arms 121 in the other three sets are all used for connecting to the grounding end 140, and the bottom ends of the second spiral arms 123 are all used for connecting to the feeding end 130.

In this embodiment, four sets of spiral arms 120 are disposed on the side surface of the hollow cylindrical carrier 110, so that the space on the side surface of the hollow cylindrical carrier 110 is fully utilized to reduce the size of the antenna, and two spiral arms with different lengths in each set of spiral arms 120 are respectively connected with the corresponding feed end 130 and the grounding end 140, so that the bandwidth of the antenna can be increased by coupling. Each group of spiral arms only needs to be provided with one grounding end and one feeding end corresponding to the circuit board, so that the arrangement of welding points is reduced, the subsequent welding procedures are reduced, and the rework rate is reduced.

In one embodiment, as shown in FIG. 3, a side expanded view of hollow cylindrical carrier 110 is shown in one embodiment. Wherein the length of the first spiral arm 121 is greater than the length of the second spiral arm 123. And a metal strip is connected between the bottom ends of the first spiral arm 121 and the second spiral arm 123.

In one embodiment, each set of spiral arms 120 has a first spiral arm 121 for exciting low frequencies and a second spiral arm 123 for exciting high frequencies.

Specifically, the length of the first spiral arm 121 in each set of spiral arms 120 is greater than the length of the second spiral arm 123 in this embodiment. Wherein the first spiral arm 121 is connected to one of the feeder terminal 130 or the ground terminal 140 on the circuit board 200 for exciting a low frequency; and the second spiral arm 123 is connected to the other of the feeder end 130 or the ground end 140 on the circuit board 200. That is, when the first spiral arm 121 is connected to the feeding terminal, the second spiral arm 123 is connected to the ground terminal, and vice versa.

The present embodiment resonates by the first spiral arm 121 and the second spiral arm 123 to receive satellite signals.

In one embodiment, the resonant frequency of the first spiral arm 121 is between 1.200GHz and 1.250GHz, and the resonant frequency of the second spiral arm 123 is between 1.555GHz and 1.610 GHz.

Specifically, since the first frequency and the second frequency of the satellite signal transmitted by the GPS are 1575.42MHz and 1228MHz, respectively; the first frequency and the second frequency of the satellite signals sent by the Beidou navigation system are 1559.052-1591.788MHz and 1166.22-1217.37MHz respectively; the first and second frequencies of the global positioning system for GLONASS (GLONASS) are about 1602 and 1246 khz, respectively. Therefore, the first spiral arm 121 and the second spiral arm 123 of the present embodiment can receive a plurality of satellite signals, and meet the requirement of coverage of a plurality of positioning systems.

In one embodiment, as shown in fig. 4, a schematic structural diagram of a quadrifilar helix antenna 100 is provided. The first spiral arm 121 includes a first radiating segment 1211 and a second radiating segment 1212. The second radiating section 1212 includes two equal length and parallel first and second arms extending from the end of the first radiating section toward the top of the hollow cylindrical carrier 110.

In particular, reference can be made to fig. 5, which is a side expanded view of the hollow cylindrical carrier 110 in this embodiment. In this embodiment, the second radiation section 1212 is configured as two arms, so as to adjust the resonant frequency of the first spiral arm 121, thereby reducing the size of the quadrifilar helix antenna 100.

In one embodiment, the length of the first arm and the second arm of the first spiral arm 121 are each 0.1 to 0.2 times the wavelength of the center frequency of the resonance frequency of the first spiral arm 121. For example, if the resonant frequency of the first spiral arm 121 is between 1.200GHz and 1.250GHz, the length of each of the first arm and the second arm is 0.1 to 0.2 times the wavelength of the resonant frequency thereof.

In one embodiment, as shown in fig. 6, a schematic structural diagram of a quadrifilar helix antenna 100 is provided. Wherein the second spiral arm 123 comprises a first radiating section 1231 and a second radiating section 1232, the second radiating section 1232 comprising two equally long and parallel first and second arms extending from the end of the first radiating section 1231 towards the top end of the hollow cylindrical carrier.

In particular, reference can be made to fig. 7, which is a side expanded view of the hollow cylindrical carrier 110 in this embodiment. In this embodiment, the second radiating segment 1232 is configured as two arms, so as to adjust the resonant frequency of the second spiral arm 133, thereby reducing the size of the quadrifilar antenna 100.

In one embodiment, the length of the first arm 133 and the second arm 133 of the second spiral arm 133 is 0.1 to 0.2 times the wavelength of the center frequency of the resonance frequency of the second spiral arm 123. Illustratively, if the resonant frequency of the second spiral arm 123 is between 1.205GHz and 1.250GHz, the length of the first arm and the second arm are each 0.1-0.2 times the wavelength of the resonant frequency.

In one embodiment, a communication device is provided that includes the quadrifilar helix antenna 100 described above, with a hollow cylindrical carrier 110 disposed on a circuit board 200. The mechanism of the quadrifilar helix antenna 100 can refer to the corresponding embodiments described in the present application, and the description of the present embodiment is omitted here.

In one embodiment, the communication device further includes four feeding terminals 130 disposed on the circuit board 200 and a feeding network 150, where the four feeding terminals 130 are four input ports of the feeding network 150, and the radio frequency signal input received by the four sets of spiral arms 100 is input to the feeding network through the four feeding terminals 130.

In this embodiment, the first spiral arm 121 connected to the ground terminal 140 may be connected to the second spiral arm 123 connected to the feed terminal 130, so as to increase the bandwidth of the antenna by coupling, so as to accurately receive satellite signals with different frequencies.

In one embodiment, as shown in fig. 8, a schematic structure of the feeding network 300 is shown, and the four-arm helical antenna 100 is described above, wherein four feeding terminals 130 of the four-arm helical antenna 100 are connected to four input ports of the feeding network 300, so as to input the radio frequency signals received by the four sets of helical arms 120, i.e. the rotation feeds of 0 °, 90 °, 180 ° and 270 ° respectively, into the feeding network 300 at the same time. The feed network 300 is an important component in the base station antenna, and the feed network 300 connects the antenna port and the array element to form a radio frequency signal transmission path.

Specifically, the feed network 300 is disposed on the circuit board 200 inside the cylindrical carrier 110. The four feeding terminals 130 may be four pad structures on the circuit board 200, or may be an integral structure formed by the spiral arm and disposed on the printed circuit board 200, or may be an extension line. It is understood that the feeding end 130 in this embodiment can be reasonably set by a person skilled in the art, as long as the purpose of connecting the spiral arm of the four-arm spiral antenna 100 with the feeding network 300 can be achieved.

In this embodiment, the four feeding ends 130 input the radio frequency signals received by the quadrifilar helix antenna 100 into the feeding network 300, so as to achieve the high-precision multi-mode navigation requirement.

In one embodiment, with continued reference to fig. 9, the feeding network 300 is disposed on the circuit board 200, and includes a phase shifting unit 301, a first signal amplifying unit 302, a first power distributing unit 303, a filtering unit 304, a second power distributing unit 305, and a second signal amplifying unit 306, which are sequentially connected, wherein: the phase shifting unit 301 is configured to perform phase shifting processing on radio frequency signals received by the four groups of spiral arms 120 and having different phases, so as to obtain a synthesized first radio frequency signal; the first signal amplifying unit 302 is configured to amplify a first radio frequency signal; the first power distribution unit 303 is configured to perform signal separation on the radio frequency signal output by the first signal amplification unit 302, so as to obtain a second radio frequency signal and a third radio frequency signal; the filtering unit 304 includes a first band-pass filter BFP1 and a second band-pass filter BFP2, the first band-pass filter BFP1 is configured to filter the second radio frequency signal to obtain a fourth radio frequency signal, the second band-pass filter BFP2 is configured to filter the third radio frequency signal to obtain a fifth radio frequency signal, and frequencies of the fourth radio frequency signal and the fifth radio frequency signal are different; the second power allocation unit 305 is configured to perform signal synthesis on the fourth radio frequency signal and the fifth radio frequency signal, so as to obtain a synthesized sixth radio frequency signal; the second signal amplifying unit 306 is configured to amplify and output the sixth rf signal.

For the four-arm helical antenna 100, there is a phase difference of 90 ° between satellite signals received by the four sets of helical arms 120. Therefore, in this embodiment, the gain is improved by filtering the received satellite signal after phase shifting, and then the radio frequency signal with higher gain is obtained through power division, filtering, synthesis and re-filtering. The accuracy of the antenna for receiving satellite signals is improved, and a user can realize accurate positioning through the satellite positioning system.

The following provides an antenna simulation result of an embodiment to illustrate the beneficial effects of the technical scheme of the present application.

As shown in fig. 9, a schematic diagram of return loss of the quadrifilar helix antenna obtained using the embodiment of fig. 4 is provided. The abscissa in the figure is the frequency (GHz), and the ordinate is the return loss parameter (dB), and as can be seen from fig. 9, the return loss is less than-6.08 dB at 1.2GHz-1.25GHz and 1.55GHz-1.61GHz, and the frequencies cover the first frequency and the second frequency of the GPS, the beidou and the GLONASS, so as to realize the reception of the multi-frequency satellite signals.

As shown in fig. 10, a pattern of the quadrifilar helix antenna is provided at a frequency of 1.555GHz-1.610 GHz. Specifically, the abscissa in fig. 10 is the pitch angle, and the ordinate is the gain. Fig. 10 includes a gain profile for a left-hand polarized quadrifilar helix antenna at a frequency of 1.600GHz and a gain profile for a right-hand polarized quadrifilar helix antenna at a frequency of 1.600 GHz. And the broken line is used to represent the gain curve at an azimuth angle of 90 ° and the solid line is used to represent the gain curve at an azimuth angle of 0 °.

As shown in fig. 11, a pattern of four-arm helical antennas at frequencies of 1.200GHz-1.250GHz is provided. Specifically, the abscissa in fig. 11 is the pitch angle, and the ordinate is the gain. Fig. 11 includes a gain profile for a left-hand polarized quadrifilar helix antenna at a frequency of 1.205GHz and a gain profile for a right-hand polarized quadrifilar helix antenna at a frequency of 1.2.05 GHz. And the broken line is used to represent the gain curve at an azimuth angle of 90 ° and the solid line is used to represent the gain curve at an azimuth angle of 0 °.

As can be seen from fig. 10 and 11, the quadrifilar helix antenna in the present embodiment has better gain and cross polarization ratio effects.

In the description of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The above disclosure provides many different embodiments or examples for implementing different structures of the present application. The components and arrangements of specific examples are described above in order to simplify the disclosure of this application. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above embodiments are only preferred embodiments of the present application, and the scope of the present application is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present application are intended to be within the scope of the present application.

Claims

1. A quadrifilar helix antenna, characterized by: the four-arm spiral antenna comprises a hollow cylindrical carrier and four spiral arm groups with the same structure;

2. The quadrifilar helix antenna according to claim 1 wherein the metal strip is connected between the bottom end of the first helical arm and the bottom end of the second helical arm.

3. The quadrifilar helix antenna according to claim 1 wherein the resonant frequency of the first helical arm is between 1.2GHz-1.25GHz and the resonant frequency of the second helical arm is between 1.55GHz-1.61 GHz.

4. A quadrifilar helix antenna according to any one of claims 1 to 3 wherein the first helix arm comprises a first radiating section and a second radiating section, the second radiating section comprising two parallel first and second arms, the first and second arms extending from the ends of the first radiating section towards the top end of the hollow cylindrical carrier, respectively.

5. A quadrifilar helix antenna according to any one of claims 1 to 3 wherein the second helix arm comprises a first radiating section and a second radiating section, the second radiating section comprising two parallel first and second arms, the first and second arms extending from the ends of the first radiating section towards the top end of the hollow cylindrical carrier, respectively.

6. The quadrifilar helix antenna according to claim 4 wherein the length of the first and second arms are each between 0.1 and 0.2 times the wavelength corresponding to the center frequency of the resonant frequency band of the first helical arm.

7. The quadrifilar helix antenna according to claim 5 wherein the length of the first and second arms are each between 0.1 and 0.2 times the wavelength corresponding to the center frequency of the resonant frequency band of the second helical arm.

8. A communication device comprising a circuit board and the quadrifilar helix antenna according to any of claims 1 to 7, wherein the hollow cylindrical carrier is provided on the circuit board.

9. The communication device of claim 8, further comprising a feed network disposed on the circuit board and four feed terminals, the four feed terminals being four input ports of the feed network, the four sets of spiral arms further configured to receive radio frequency signals and input to the feed network through corresponding feed terminals.

10. The communication device of claim 9, wherein the feed network comprises a phase shifting unit, a first signal amplifying unit, a first power dividing unit, a filtering unit, a second power dividing unit, a second signal amplifying unit, connected in sequence, wherein: