CN201392884Y - Binary plane inverted-F antenna array - Google Patents

Abstract

The utility model discloses a binary plane inverted-F antenna array which comprises a PCB dielectric board and a metal floorboard fixed on the PCB dielectric board, wherein the metal floorboard is provided with a through groove, two plane inverted-F antennas are fixed on the two sides of the through groove in parallel, the adjacent inner sides of the two plane inverted-F antennas are respectively located on the same plane with the positions in which the sides of the grooves are located, the adjacent inner sides of the two plane inverted-F antennas can form a lambda/2 groove antenna together with the through groove, thereby attenuating the coupling between two PIFAs. The binary plane inverted-F antenna array has the advantages of high isolation degree, low cost, compact structure and convenient production and integration.

Description

A kind of binary plane inverted F antenna array

Technical field

The utility model relates to a kind of binary plane inverted F antenna array.

Background technology

Require the multiple antenna emission in MIMO (many antenna inputs, many antenna outputs) communication, multiple antenna receives simultaneously.All emissions with accept antenna and all be operated in identical frequency.In order to guarantee higher transmission rate, all antennas will guarantee less coupling.Require the portable terminal miniaturization, low cost in the MIMO communication simultaneously.The method of the isolation between traditional raising antenna generally is by increasing the antenna array unit spacing or two different antennas of polarization mode being put together.But no matter be which kind of method, the center distance of antenna element is all bigger.And complex structure is difficult to satisfy the demand of MIMO communication.

Summary of the invention

The purpose of this utility model is at the deficiencies in the prior art, provides a kind of isolation height, cost low, and compact conformation is convenient to make and integrated binary plane inverted F antenna array.

Binary plane inverted F antenna array of the present utility model, comprise the PCB dielectric-slab, be fixed on the metal floor on the PCB dielectric-slab, metal floor has groove, two planar inverted-F antennas (PIFA) secured in parallel is in the both sides of groove, the adjacent inner edge of two planar inverted-F antennas is in same plane with the trough rim of position respectively, and the adjacent inner edge of two planar inverted-F antennas and groove be common to constitute λ/2 slot antennas.

The beneficial effects of the utility model are:

Binary plane inverted F antenna array utilizes adjacent inner edge and λ/2 slot antennas of the common formation of groove of two planar inverted-F antennas, can be used for weakening two couplings between PIFA, under the situation of two PIFA spacings less than λ/50, isolation in working band below the realization-20dB, the isolation that centre frequency place-30dB is following.The utlity model has the isolation height, cost is low, compact conformation such as is convenient to make and integrated at advantage.

Description of drawings

Fig. 1 is the formation schematic diagram of binary plane inverted F antenna array of the present utility model, and wherein: (a) being front view, (b) is vertical view, (c) is end view;

Fig. 2 is the isolation characteristic schematic diagram of each output port of binary plane inverted F antenna array;

Fig. 3 is the return loss characteristic schematic diagram of each port of binary plane inverted F antenna array.

Embodiment

Further specify the utility model below in conjunction with accompanying drawing.

With reference to Fig. 1, binary plane inverted F antenna array of the present utility model, comprise PCB dielectric-slab 1, be fixed on the metal floor 2 on the PCB dielectric-slab, metal floor has groove 3, two planar inverted-F antenna 4 secured in parallel are in the both sides of groove, and the adjacent inner edge 5 of two planar inverted-F antennas is in same plane with the trough rim of position respectively, and the adjacent inner edge 5 of two planar inverted-F antennas and groove 3 be common to constitute λ/2 slot antennas.

During work, utilize common λ/2 slot antennas that constitute of the adjacent inner edge of two planar inverted-F antennas and groove, can weaken two couplings between PIFA, isolate the frequency f of strength _ISOCan be expressed as following formula:

$f_{\mathrm{ISO}}=\frac{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="Y2009201181370005H1.png"\; state="\{\{state\}\}">c</figure-callout>}}{2\&CenterDot;(h_{\mathrm{PIFA}}+l_{\mathrm{PIFA}}+l_{\mathrm{SLOT}})}$

Wherein, h _PIFA, l _PIFABe respectively the high and long of PIFA, l _SLOTBe the length of the groove that comprises medium influence on the floor, c is the free space light velocity.

The binary plane inverted F antenna array design example: designing a centre frequency is 2.44GHz, and-6dB bandwidth covers 2.4-2.48GHz (WLAN), isolates the binary PIFA array less than-20dB.The absolute bandwidth of this binary PIFA array is 107.7MHz, and relative bandwidth is 4.4%.Adopt the structure of Fig. 1 to realize that wherein the relative dielectric constant of PCB medium is 4.7, the metal thickness that is used to make antenna and floor in the structure is 0.4mm, the long L=24mm of metal floor, wide W=41mm, the h of PIFA unit _PIFA=7mm, l _PIFA=22mm, w _PIFA=6mm, the distance of two PIFA inner edges is Ws=1.8mm.The isolation performance of the binary PIFA array output end mouth of employing above-mentioned parameter design and return loss performance are as shown in Figures 2 and 3.

Fig. 2 has provided the isolation of the port of two PIFA, among the figure: S21 is the transmission coefficient of input to the second PIFA output of first PIFA, S12 is the transmission coefficient of the input of second PIFA to first PIFA output, transmission coefficient has reflected the degree of the isolation of two PIFA ports, transmission coefficient more septulum from good more.Binary plane inverted F antenna array of the present utility model is isolated maximum and can be reached-30dB.

Fig. 3 has provided the amplitude response of two PIFA ports return losses separately.Among the figure: S11 is the reflection coefficient of first PIFA input, and S22 is the reflection coefficient of second PIFA output.

By Fig. 2 and Fig. 3 as seen, binary plane inverted F antenna array of the present utility model in the frequency range of work under the situation that keeps good return loss and isolation, simple in structure in addition, low cost and other advantages.

Claims (1)

1. binary plane inverted F antenna array, it is characterized in that comprising PCB dielectric-slab (1), be fixed on the metal floor (2) on the PCB dielectric-slab, metal floor has groove (3), two planar inverted-F antennas (4) secured in parallel is in the both sides of groove, the adjacent inner edge (5) of two planar inverted-F antennas is in same plane with the trough rim of position respectively, and the adjacent inner edge (5) of two planar inverted-F antennas constitutes a λ/2 slot antennas jointly with groove (3).

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