CN203800182U - Multi-band combination transmitting antenna - Google Patents

Abstract

The utility model discloses a multi-band combination transmitting antenna which comprises seven active oscillator units integrated in the same plane. The active oscillator units are distributed from low frequency to high frequency from back to front. Each unit comprises a pre-stage active oscillator unit which serves as a reflection oscillator and also severs as a guidance oscillator of a back-stage active oscillator unit; and the active oscillator units are in pre-stage-low-frequency active oscillator unit 0.2-0.4 wave length interval arrangement. The transmitting antenna is subjected to multichannel integration based on a common Yagi antenna, is specially used for transmitting radio-frequency signals, and has the advantages of orientation, broadband and no frequency blind spot and the like. The transmitting antenna can transmit multiple paths of signals without a plurality of antennas, and is suitable to be used in occasions where broadband interference suppressing is carried out in specific direction and the like; the antenna is simple in process, convenient to process and assemble, suitable for mass production, wide in application range, large in market requirement, and wide in application range.

Description

A kind of multiband combined transmit antenna

Technical field

The utility model relates to a kind of radio wave transmission antenna, particularly a kind of multiband transmitting antenna.

Background technology

Transmitting antenna is the critical component of electromagnetic radiation, is widely used in the fields such as broadcast, interference, electromagnetic shielding.The general frequency bandwidth of transmitting antenna for a certain frequency range is limited, and frequency band is wider, and in the band of antenna, gain fluctuation is larger, directly has influence on electromagnetic radiation effect.Examination hall cheating, the illegal scene that particularly reply is becoming increasingly rampant various means of communication and the means of communication such as divulge information covertly, not only require frequency domain slitless connection that compacting is disturbed, and require power in mask tape evenly, compacting field intensity is enough large.Therefore, be necessary for the interior radiating antenna of band that radio-frequency power provides continuous effective.Yet the existing frequency range of need disturbing is wider, if adopt conventional transmitting antenna, can only effectively disturb the electromagnetic wave of a certain frequency range, cannot accomplish that each interference band takes into account; And in order to meet the compacting demand of each frequency range, if adopt the simple way that increases different frequency range jamming equipment, can greatly increase equipment investment, the expansion of equipment volume also can bring a lot of inconvenience for normal use.

Utility model content

Technical problem to be solved in the utility model is to provide effective enforcement directional jamming in a kind of 80MHz--800MHz frequency range and suppresses electromagnetic multiband combined transmit antenna, and it uses a set of antenna to implement to disturb to wider frequency range.

A kind of multiband combined transmit antenna described in the utility model, this antenna comprises seven active dipole unit that are integrated in same plane, press by low frequency to high frequency distribution respectively from low to high, each unit comprises active dipole, director dipole and reflection oscillator, its active dipole itself is as the director dipole of rear class, the reflection oscillator of busy previous stage, between every two active dipole unit with the arranged with interval of low-frequency active oscillator 0.2-0.4 medium wavelength.Between the 2nd and the 3rd active dipole, can add one-level parasitic element and as rear class, guide into and prime reflection oscillator, can also this for boundary, become 2 antennas.

Wherein, for arranged with interval, if wish, secondary lobe is less, between every two active dipole unit with the arranged with interval of last low-frequency active oscillator 0.3-0.4 medium wavelength; If wish, gain and directivity are better, between every two active dipole unit with the arranged with interval of last low-frequency active oscillator 0.2-0.3 medium wavelength.

The frequency range of described seven active dipole unit is respectively 80MHz～111 MHz, 110MHz～155 MHz, 154MHz～215MHz, 214MHz～298 MHz, 297MHz～414 MHz, 413MHz～576 MHz, 575MHz～800MHz from low to high.

As improvement, the length of each active dipole is the medium length of frequency range λ/2.On this utility model basis, can design as required the combined transmit antenna of any frequency range.

It is integrated that the utility model carries out multichannel on the basis of common Yagi antenna, becomes combination all channel antenna, for special emitting radio frequency signal, has orientation, broadband, without advantages such as frequency blind spots.Using this technology can launch multiple signals without multi-section antenna, be applicable to specific direction be carried out to the occasions such as broadband compacting interference, is the necessary equipment of directional frequencies control, examination hall shielding, prison and the compacting shielding of secret place.This antenna production technology is simple, and process and assemble is convenient, is applicable to large-scale production.Applied range, the market demand is large, can use wide ranges, and exploitation extending space is large.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

Embodiment

The utility model is in 80MHz--800MHz frequency range, use 7 sections of radiating doublets, by science driven dimension, combine, thereby build, guide combined antenna into, its directivity and each band gain all have good effect, the launch requirements that meets multichannel seamless connection is completely the ideal equipment of directional jamming compacting.

Its concrete structure is shown in Fig. 1, this antenna is similar to Yagi antenna, by seven active dipole unit that are integrated in same plane, formed, antenna is pressed by low frequency to high frequency distribution respectively from low to high, each unit comprises active dipole, director dipole and reflection oscillator, its active dipole itself is as the director dipole of rear class, the reflection oscillator of busy previous stage, between every two active dipole unit with the arranged with interval of low-frequency active oscillator 0.2-0.4 medium wavelength.; The frequency range of seven active dipole unit is respectively 80MHz～111 MHz, 110MHz～155 MHz, 154MHz～215MHz, 214MHz～298 MHz, 297MHz～414 MHz, 413MHz～576 MHz, 575MHz～800MHz from low to high.

Bandwidth problem is the difficult problem that antenna faces.It is slow that so-called broad-band antenna is band edge gain decline, and practical application frequency band is still limited.The effective way that solves bandwidth is the combination of many antennas band overlapping, uses multichannel transmitting antenna, reaches the requirement of seamless coverage.In general, for the antenna receiving, the gain of gliding of its sideband can be improved by isostatic compensation, and antenna for launching, will rely on antenna self the design bandwidth of realizing ideal completely.The technological difficulties that this programme will solve are that reasonable frequency band setting and the frequency band between adjacent two antennas of single portion antenna overlaps.The combination spacing of multi-section antenna determines the directional diagram of antenna, also affects the gain of antenna simultaneously.The utility model adopts 7 active dipole unit, frequency distribution from low to high, and low side oscillator is the reflection oscillator of the high frequency oscillator in the place ahead, and prime oscillator is as the director dipole of rear oscillator, builds so dexterously entire combination Yagi antenna.Be characterized in good directionality, gain high, result is simple, is desirable multichannel broadband emission antenna.

Active antenna spacing is the 0.4 times of calculating that is less than last frequency range oscillator.Generally, spacing is larger, and main lobe is narrower, and the frequency response of input impedance is better, but the minor lobe of antenna is larger.Spacing selection hour, secondary lobe is less, but gain and directivity are less better.If consider the former, spacing can be selected greatly, at 0.3-0.4 wavelength; If consider the latter, spacing can be selected less, in 0.2-0.3 medium physical wavelength.User freely selects according to demand.The material of active dipole is copper pipe or aluminum pipe, and diameter is generally less than 15mm, and caliber is large, and oscillator length should be less, and full-size must not be greater than λ/2.The design length of active dipole is the medium length of frequency range λ/2, the medium physical length of element spacing < λ/2, and this measure is in order that the increase directivity of antenna and the impedance matching of active dipole and high-frequency feed line need.

The utility model is mainly the design that transmits, can multichannel seamless connection within the scope of certain frequency, transmit continuously, and form broadband combining structure antenna.Be applicable to the application scenarios such as broad-band interference transmitter, directed broadband transmission signal.Its frequency coverage is 80MHz-800MHz, and Fen Qi road transmission channel is overlapping between two, without frequency gap.7 road active dipole bandwidth surpass 30% respectively, and in combination band, gain is greater than 3dB, and Radiational sector is greater than 60 ^o.Because element spacing and antenna main beam width and impedance frequency response and tail beam size are conflicts, therefore, can change element spacing design according to user demand.What need that main lobe is narrow, frequency response is good can suitably strengthen spacing, but does not surpass 0.5 λ, needs little secondary lobe, azimuthally selects little spacing design greatly, but generally should not be less than 0.15 λ.The impedance matching of active dipole adopts the universal way of λ/2 matched line.

The concrete application approach of the utility model is a lot; the above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of the utility model principle; can also make some improvement, expand to any practical frequency range, these improvement also should be considered as protection range of the present utility model.

Claims (4)

1. a multiband combined transmit antenna, it is characterized in that, this antenna comprises seven active dipole unit that are integrated in same plane, press respectively from back to front low frequency to high frequency distribution, each unit comprises the director dipole in active dipole, the place ahead and the reflection oscillator at rear, and rear active dipole doubles as reflection oscillator, be also the director dipole of rear class simultaneously; Between two between active dipole unit with the arranged with interval of low-frequency active oscillator unit 0.2-0.4 wavelength.

2. multiband combined transmit antenna according to claim 1, is characterized in that, if select secondary lobe less, between two between active dipole unit with the arranged with interval of low-frequency active oscillator unit 0.3-0.4 wavelength; If select gain and directivity better, between two between active dipole with the arranged with interval of low-frequency active oscillator unit 0.2-0.3 wavelength.

3. multiband combined transmit antenna according to claim 1 and 2, it is characterized in that, the frequency range of seven active dipole unit is respectively 80MHz～111 MHz, 110MHz～155 MHz, 154MHz～215MHz, 214MHz～298 MHz, 297MHz～414 MHz, 413MHz～576 MHz, 575MHz～800MHz from low to high.

4. multiband combined transmit antenna according to claim 1 and 2, is characterized in that, the length of each active dipole is the medium length of frequency range λ/2.