表 28：GNSS 频率
| type | frequencies | units |
|---|---|---|
| GPS/Galileo/QZSS | 1575.42 ±1.023 | MHz |
| GLONASS | 1597.5~1605.8 | MHz |
| BeiDou | 1561.098 ±2.046 | MHz |
GPS
GSM
SMA to IPEX converter cable
antenna shape, size and gain
| type | rod | paddle |
|---|---|---|
| style |  |
 |
| gain | 2dbi | 8dbi |
| Features | - | foldable |
GNSS recommanded antenna specifications
passive
- Frequency Range: 1559–1609 MHz
- Polarization: RHCP
- VSWR: < 2 (Typ.)
- Passive Antenna Gain: > 0 dBi
active
- Frequency Range: 1559–1609 MHz
- Polarization: RHCP
- VSWR: < 2 (Typ.)
- Passive Antenna Gain: > 0 dBi
- Active Antenna Noise Figure: < 1.5 dB
- Active Antenna Total Gain: < 18 d
Connection Type
- Wire or Pin Soldering
- u.FL IPEX - ipex-dat
- SMA inner-hole or inner-pin
2.4 antenna: wifi, bluetooth
for sticking inside of enclosure https://www.electrodragon.com/product/2-4g-soft-fpc-pcb-antenna-ipx-rohs/
for remote-control toys https://www.electrodragon.com/product/5pcs-2-4g-cable-type-antenna/
GSM antenna
https://www.electrodragon.com/product/pcb-build-antenna-4g-gsm-3g-wcdma-gprs/
SMA antenna 3 Meters https://www.electrodragon.com/product/gps-magenatic-active-external-antenna-3m/
SMA small-size antenna - 2PCs Quad-band Cellular GSM Antenna SMA 2Dbi https://www.electrodragon.com/product/quad-band-cellular-duck-antenna-sma/
RF antenna:
- common apps: LORA, NBIOT
- common bands: 315Mhz, 433MHz, 470Mhz, 490Mhz, 868MHz, 915MHz
spring coil antenna https://www.electrodragon.com/product/spring-coil-antenna-433-mhz/
GPS antenna
ceramic mini antenna https://www.electrodragon.com/product/gps-ceramic-antenna-build/
large outdoor antenna https://www.electrodragon.com/product/gsm-magenatic-external-antenan-3m-5dbi/
tech
Bias-T (Bias Tee)
A Bias-T (Bias Tee) is an electronic component used in radio frequency (RF) applications, like antennas, to supply DC power to devices while allowing RF signals to pass through. It's typically used to power active antenna components, such as low-noise amplifiers (LNAs), without the need for separate power cables.
A Bias-T consists of three ports:
- RF port: Where the radio signal passes without DC.
- DC port: Where the power supply is connected.
- RF+DC port: Where the combined signal (RF and DC) is outputted or inputted.
It works by using inductors and capacitors. The inductor blocks the RF signal but allows DC to pass, while the capacitor blocks DC but allows the RF signal to pass. This way, the antenna can operate without interference from the power supply.