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參數(shù)資料
| 型號(hào)： | EM2420TR |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 2.4 GHz IEEE 802.15.4 / ZigBee RF Transceiver |
| 中文描述： | 2.4 GHz IEEE 802.15.4標(biāo)準(zhǔn)/ ZigBee的射頻收發(fā)器 |
| 文件頁(yè)數(shù)： | 62/89頁(yè) |
| 文件大?。?/td> | 1758K |
| 代理商： | EM2420TR |
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EM2420
Ember Part Number: 120-0049-000
C
EM2420 Datasheet
Page 62 of 89
Monopole
antennas with a length corresponding to
one quarter of the electrical wavelength
(
λ
/4). They are very easy to design and
can be implemented simply as a “piece of
wire” or even integrated into the PCB.
antennas
are
resonant
The length of the
λ
/4-monopole antenna is
given by:
L = 7125 / f
where f is in MHz, giving the length in cm.
An antenna for 2450 MHz should be 2.9
cm.
Non-resonant monopole antennas shorter
than
λ
/4 can also be used, but at the
expense of range. In size and cost critical
applications such an antenna may very
well be integrated into the PCB.
Enclosing the antenna in high dielectric
constant material reduces the overall size
of the antenna. Many vendors offer such
antennas intended for PCB mounting.
Helical antennas can be thought of as a
combination of a monopole and a loop
antenna. They are a good compromise in
size critical applications. Helical antennas
tend to be more difficult to optimize than
the simple monopole.
Loop antennas are easy to integrate into
the PCB, but are less effective due to
difficult impedance matching because of
their very low radiation resistance.
For low power applications the differential
antenna is recommended giving the best
range and because of its simplicity.
The antenna should be connected as
close as possible to the IC. If the antenna
is located away from the RF pins the
antenna should be matched to the feeding
transmission line (50
).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EM242302 | 功能描述:柵欄接線端子 EURO MC421-38102 TERM RoHS:否 制造商:TE Connectivity / AMP 產(chǎn)品:Barrier Terminal Blocks 系列: 類型:Dual Barrier, Flat Block without Mounting Ears 節(jié)距:9.53 mm 位置/觸點(diǎn)數(shù)量:2 線規(guī)量程:22-12 電流額定值:20 A 電壓額定值:300 V 安裝風(fēng)格:Through Hole 安裝角:Vertical 端接類型:Screw 觸點(diǎn)電鍍:Tin |
| EM242303 | 功能描述:柵欄接線端子 EURO MC421-38103 TERM RoHS:否 制造商:TE Connectivity / AMP 產(chǎn)品:Barrier Terminal Blocks 系列: 類型:Dual Barrier, Flat Block without Mounting Ears 節(jié)距:9.53 mm 位置/觸點(diǎn)數(shù)量:2 線規(guī)量程:22-12 電流額定值:20 A 電壓額定值:300 V 安裝風(fēng)格:Through Hole 安裝角:Vertical 端接類型:Screw 觸點(diǎn)電鍍:Tin |
| EM242608H | 功能描述:可插拔接線端子 EuroMag Pluggable Terminal Block RoHS:否 制造商:Phoenix Contact 產(chǎn)品:Plugs 系列:PTS 端接類型:Spring Cage 位置/觸點(diǎn)數(shù)量:5 線規(guī)量程:26-14 節(jié)距:5 mm 電流額定值:10 A 電壓額定值:250 V 安裝風(fēng)格: 安裝角: 觸點(diǎn)電鍍: |
| EM-24346-C36 | 功能描述:麥克風(fēng) 3.61 X 3.61 X 2.21MM -52 SENS, 12SL PORT RoHS:否 制造商:Knowles Acoustics 方向性:Omnidirectional 阻抗:4.4 K Ohms 工作電壓:0.9 V to 10 V 靈敏度:- 53 dB 端接類型:Wire Leads 長(zhǎng)度:5.56 mm 寬度:3.98 mm 深度:2.21 mm |
| EM-24346-D65 | 功能描述:100Hz ~ 10kHz Analog Microphone Electret Condenser 1.3V Omnidirectional (-52dB ±3dB @ 74dB SPL) Solder Pads 制造商:knowles 系列:EM 包裝:托盤 零件狀態(tài):有效 類型:駐極體電容 輸出類型:模擬 方向:全向 頻率范圍:100Hz ~ 10kHz 靈敏度:-52dB ±3dB @ 74dB SPL 信噪比:- 阻抗:4.4 千歐 電壓 - 額定:1.3V 電壓范圍:0.9 ~ 3V 電流 - 電源:50μA 端口位置:側(cè)面 密封等級(jí):無(wú) 端接:焊盤 大小/尺寸:3.57mm 長(zhǎng) x 3.57mm 寬 高度（最大值）:2.21mm 形狀:方形 標(biāo)準(zhǔn)包裝:25 |
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