天線增益是用來(lái)衡量天線朝一個(gè)特定方向收發(fā)信號(hào)的能力,它是選擇基站天線最重要的參數(shù)之一.
天線增益是用來(lái)衡量天線朝一個(gè)特定方向收發(fā)信號(hào)的能力,它是選擇基站天線最重要的參數(shù)之一.一般來(lái)說(shuō),增益的提高主要依靠減小垂直面向輻射的波瓣寬度,而在水平面上保持全向的輻射性能.天線增益對(duì)移動(dòng)通信系統(tǒng)的運(yùn)行質(zhì)量極為重要,因?yàn)樗鼪Q定蜂窩邊緣的信號(hào)電平.增加增益就可以在一確定方向上增大網(wǎng)絡(luò)的覆蓋范圍,或者在確定范圍內(nèi)增大增益余量.任何蜂窩系統(tǒng)都是一個(gè)雙向過(guò)程,增加天線的增益能同時(shí)減少雙向系統(tǒng)增益預(yù)算余量.另外,表征天線增益的參數(shù)有dBd和dBi.DBi是相對(duì)于點(diǎn)源天線的增益,在各方向的輻射是均勻的;dBd相對(duì)于對(duì)稱(chēng)陣子天線的增益dBi=dBd+2.15.相同的條件下,增益越高,電波傳播的距離越遠(yuǎn).一般地,GSM定向基站的天線增益為18dBi,全向的為11dBi.

MT-221014/TV
Specification:參數(shù)
Electrical電性特點(diǎn)
Frequency Range頻率范圍:         20-1250MHz
Peak Gain天線最大增益圖:       Freq. 頻率      dBi天線的增益值
VSWR駐波比:                  3:1(typ)3.5:1(max)
Azimuth pattern方位方式:           Omnidirectional全方位
Elevation pattern仰角圖覆蓋范圍:   +25°,-10°(without nulls)不含零值
Coverage
Polarization偏振現(xiàn)象:              vertical垂直
Phase Tracking相位跟蹤:            ±3°for 20 to 150MHz
                                 ±4°for 150 to 1250MHz 90% of the band
                                 ±7°for 150 to 1250MHz 10% of the band

Input Impedance輸入電阻:            50 Ohms 50歐
Input Power輸入功率:                10W CW, 1Kw peak 10瓦連續(xù)波,1千萬(wàn)峰值
Lightening Protection防雷方式:        DC Grounded直流接地

Mechanical機(jī)械性:
Weight重量:                         2.1kg
Connector 連接器類(lèi)型:               TNC-Type female
Radome天線屏蔽器:                Fiberglass玻璃纖維
Enviromental應(yīng)用環(huán)境:              MIL-E-5400
MT-4030
Specifications參數(shù)
Electrical電性特點(diǎn)
Frequency Range頻率范圍:      2-8GHz
Polarization偏振現(xiàn)象:           Circular環(huán)形
Half power beamwidth半功率速寬  75°±20°
10Db beamwidth10分貝的射速寬度   140°
Axial ratio 軸比                 boresight 1:5db
                                ±30°,2dB
                                ±60°,4dB
Beam squint光速斜度             ±5°

Mechanical機(jī)械性能
Connector連接器                 SMA Female

Environmental應(yīng)用環(huán)境
The antenna is designed in accordance with military specifications for ground equipment
該天線是按照軍用標(biāo)準(zhǔn)專(zhuān)門(mén)設(shè)計(jì)的一種設(shè)備.
Temperature operation工作溫度:      -20 °to 71°
Non- operation非工作溫度:         -20 °to 85°
Wind speed風(fēng)速:                 120KM/hr

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