CN211789521U - Miniaturized dual-band PIFA antenna and compact combined antenna - Google Patents

Abstract

The utility model discloses a miniaturized dual-frenquency PIFA antenna and compact combination antenna belongs to wireless communication technical field. The combined antenna consists of a PIFA antenna and a monopole antenna; the PIFA antenna is arranged in parallel to the carrier platform; the PIFA antenna comprises two radiators with bent lines and is used for covering a high-frequency band and a low-frequency band; the PIFA antenna further includes an inductive element connected between the feed line and the radiator for reducing the size of the antenna and securing the performance of the antenna. The radiation element of the monopole antenna has two L-shaped radiators. The utility model discloses a structure of kinking has improved the space utilization of carrier platform, has realized the cover of dual-frenquency area through two branch knot techniques.

Description

Miniaturized dual-band PIFA antenna and compact combined antenna

Technical Field

The utility model relates to a wireless communication technology field especially indicates a miniaturized dual-frenquency PIFA antenna and compact combination antenna.

Background

With the development of wireless communication technology, people's daily life has been greatly enriched. In order to realize various wireless communication functions, corresponding communication equipment needs to be installed on a carrier platform. As for antennas, which are important components of wireless communication systems, the number of communication devices on a carrier platform also needs to be increased correspondingly; due to the limited space of the carrier platform, there is a higher miniaturization requirement for the antenna. Miniaturization of antennas producing such bands is a problem that must be faced, particularly for the VHF and 3G bands. In addition, multiple antennas are placed in a limited space, and due to mutual coupling, the performance of the antennas is difficult to meet the actual use requirement.

The VHF antenna forms used at present mainly include sleeve antenna, discone antenna and microstrip printed antenna, etc. The 3G antenna mainly comprises a whip antenna, a glass antenna, a micro-strip printed antenna and the like; the two types of antennas are not suitable for the requirement of the carrier platform on the miniaturization of the antenna because the size of the antenna is large or the cross section of the antenna is high.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a miniaturized dual-frenquency PIFA antenna and compact combination antenna. The compact structure of the multi-band multi.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a miniaturized dual-frenquency PIFA antenna, includes first radiating element, first radiating element on be connected with first feeder and short circuit structure, first radiating element include trunk circuit irradiator and two branch irradiators, two branch irradiators are buckling line structure and the head end of buckling line all is connected with the trunk circuit irradiator, the width of the slot of buckling of every branch irradiator equals to the electric length inequality of two branch irradiators.

Further, the inner conductor of the first feed line is connected to the main radiator of the first radiating element through an inductance element or a capacitance element, and the outer conductor of the first feed line is grounded.

Furthermore, the short circuit structure is a metal short circuit probe, one end of the metal short circuit probe is connected with the main circuit radiator, and the other end of the metal short circuit probe is grounded.

A compact combined antenna comprises a carrier platform, a first dielectric plate, a second dielectric plate and a plurality of antenna elements, wherein the carrier platform comprises a monopole antenna and the miniaturized dual-frequency PIFA antenna, the miniaturized dual-frequency PIFA antenna is printed on the surface of the first dielectric plate, and the monopole antenna is printed on the surface of the second dielectric plate; the first dielectric plate is arranged on the upper surface of the carrier platform, the second dielectric plate is arranged on the side surface of the carrier platform, and the space included angle between the miniaturized double-frequency PIFA antenna and the monopole antenna is 90 degrees.

Furthermore, the monopole antenna comprises a second radiation unit, the second radiation unit is provided with two L-shaped radiation bodies, and the second radiation unit is also connected with a second feeder line.

Furthermore, a metal floor is further arranged at the bottom of the carrier platform, and the outer conductors of the first feeder line and the second feeder line are connected with the metal floor.

Further, the miniaturized dual-band PIFA antenna covers a VHF frequency band.

Further, the monopole antenna covers a 3G frequency band.

The utility model adopts the beneficial effect that above-mentioned technical scheme produced lies in:

1. the utility model provides an adopt inductance element or electric capacity component on the PIFA antenna, when guaranteeing whole antenna performance, still make the antenna miniaturization more.

2. The utility model provides a PIFA antenna adopts the short circuit protection structure of metal short circuit probe replacement PIFA antenna among the prior art, has not only reached miniaturized purpose, is convenient for adjust the matching characteristic of antenna moreover.

3. The utility model discloses PIFA antenna and monopole antenna in the combined antenna adopt the mode of printing the flex line on the dielectric plate, have solved the big and high problem of antenna section of antenna size among the background art.

4. Further, the utility model discloses monopole antenna among the well combination antenna, the length of two wherein L type irradiators, short radiator cover low-frequency range and high-frequency range respectively, further extend the coverage of antenna frequency channel.

Drawings

Fig. 1 is a top view of an embodiment of the present invention.

Fig. 2 is a front view of fig. 1.

Fig. 3 is a left side view in fig. 1.

Fig. 4 is a standing wave ratio of monopole antenna voltage in an embodiment of the present invention.

Fig. 5 is a standing-wave ratio of the voltage of the PIFA antenna in an embodiment of the present invention.

In the figure: 1. the antenna comprises a second dielectric plate, a first dielectric plate, a second radiating unit, a third radiating unit, a fourth radiating unit, a fifth radiating unit, a sixth radiating unit, a.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 5, a compact combined antenna includes a carrier platform, a monopole antenna, and a miniaturized dual-band PIFA antenna, which are printed on the surfaces of a first dielectric plate 2 and a second dielectric plate 1, respectively; the first dielectric plate is horizontally arranged on the upper surface of the carrier platform, and the PIFA antenna is parallel to the upper surface of the carrier platform; the second dielectric plate is positioned on the side surface of the carrier platform and the monopole antenna is vertically arranged.

Miniaturized PIFA antenna: including first radiating element, be connected with first feeder 6 and short circuit structure on the first radiating element, radiating element includes two branch irradiators 9 and trunk circuit irradiators 4, and two irradiators are the meander line structure and the head end of meander line all is connected with the trunk circuit irradiator, and the width of the slot of buckling 10 of every branch irradiator equals to the electrical length inequality of two branch irradiators.

The inner conductor of the first feed line 6 is connected to the radiating element via an inductive element 7 or a capacitive element, and the outer conductor is grounded. The short circuit structure is a metal short circuit probe 8, and the other end of the metal short circuit probe is grounded.

The radiation unit of the monopole antenna is provided with two L-shaped radiators, and the radiation unit is also connected with a second feeder line 5.

In the embodiment, the PIFA antenna covers a VHF frequency band, and the monopole antenna covers a 3G frequency band. The printed monopole antenna has the size of 54mm multiplied by 40mm multiplied by 1mm, and the PIFA antenna has the size of 350mm multiplied by 90mm multiplied by 54 mm. The length, width and height of the combined antenna of the present embodiment are 365mm × 90mm × 54 mm.

The PIFA antenna is placed parallel to the carrier to achieve a low profile characteristic. The structure of the bent line with the two branches realizes VHF multi-band coverage, the size of the antenna can be reduced by using the structure of the bent line, and two working frequency bands can be respectively adjusted by adjusting the lengths of the two branches during installation. The inductance element is used for connecting the feed structure and the VHF antenna and simultaneously plays a role in reducing the frequency band of the antenna. The performance of the two antennas can meet the actual requirement by reasonably placing the PIFA antenna and the monopole antenna and adjusting the distance between the two antennas.

The antenna realizes the coverage of two frequency bands by adopting the double-branch radiator of the PIFA antenna and the monopole antenna. Since the PIFA antenna has a low frequency, the PIFA antenna employs an inductance element and a meander line radiator in order to realize a compact structure. The resonance positions of the two frequency bands of the PIFA antenna can be changed by changing the value of the inductance element and the number of bends of the bend line. In addition, changing the position of the metal shorting probe can adjust the matching characteristics of the PIFA antenna.

Claims (8)

1. The utility model provides a miniaturized dual-frenquency PIFA antenna, includes first radiating element, first radiating element on be connected with first feeder (6) and short-circuit structure, its characterized in that, first radiating element include trunk circuit irradiator (4) and two branch irradiators (9), two branch irradiators are the meander line structure and the head end of meander line all is connected with the trunk circuit irradiator, the width of the slot of buckling (10) of every branch irradiator equals to the electrical length inequality of two branch irradiators.

2. A miniaturised dual band PIFA antenna as claimed in claim 1 wherein the inner conductor of the first feed line is connected to the main radiator of the first radiating element by an inductive or capacitive element and the outer conductor of the first feed line is connected to ground.

3. A miniaturised dual band PIFA antenna according to claim 1 characterised in that the shorting structure is a metal shorting probe (8) having one end connected to the main radiator and the other end connected to ground.

4. A compact combined antenna comprising a carrier platform, characterized in that it further comprises a monopole antenna and a miniaturized dual-band PIFA antenna according to any of claims 1-3, the miniaturized dual-band PIFA antenna being printed on the surface of the first dielectric plate (2) and the monopole antenna being printed on the surface of the second dielectric plate (1); the first dielectric plate is arranged on the upper surface of the carrier platform, the second dielectric plate is arranged on the side surface of the carrier platform, and the space included angle between the miniaturized double-frequency PIFA antenna and the monopole antenna is 90 degrees.

5. A compact combined antenna according to claim 4, characterised in that the monopole antenna comprises a second radiating element (3) having two L-shaped radiators and a second feed line (5), the inner conductor of which is connected to the second radiating element.

6. A compact combined antenna according to claim 4, characterised in that the bottom of the carrier platform is further provided with a metal floor (11), to which the outer conductors of the first and second feeder are connected.

7. A compact combined antenna as claimed in claim 4, characterised in that the miniaturized dual band PIFA antenna covers the VHF band.

8. A compact combined antenna according to claim 4, characterised in that the monopole antenna covers the 3G band.

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