Smart Device RF & Antennas

1. Smart Device RF &
Antennas
Yong Heui Cho @ Mokwon University

2. 2
Smart Device Structure
7. Android – Phone Calls
8. Introduction to IoT
9. Smart Device RF & Antennas
10. Introduction to RTOS

3. 3
3G & 4G Comparison
Attribute 3G 4G
Major Characteristic
Predominantly voice- data as
add-on
Converged data and VoIP
Network Architecture Wide area Cell based
Hybrid – integration of
Wireless LAN (WiFi),
Bluetooth, Wide Area
Frequency Band 1.6 - 2.5 GHz 2 - 8 GHz
Component Design
Optimized antenna; multi-
band adapters
Smart antennas; SW multi-
band; wideband radios
Bandwidth 5 – 20 MHz 100+ MHz
Data Rate 385 kbps - 2 Mbps 20 – 100 Mbps
Access WCDMA/CDMA2000 MC-CDMA or OFDM
Forward Error Correction
Convolution code 1/2, 1/3;
turbo
Concatenated Coding
Switching Circuit/Packet Packet
Mobile top Speed 200 km/h 200 km/h
IP Multiple versions All IP (IPv6.0)
Operational ~2003 ~2010

4. 4
RF Transmitter (Tx)
 )cos()cos(
2
1
)cos()cos( yxyxyx 
BBf BBLO ff  BBLO ff 

• Superheterodyne
• Up-conversion: frequency

5. 5
RF Receiver (Rx)
• Down-conversion: frequency
 )cos()cos(
2
1
)cos()cos( yxyxyx 
BBfBBIF ff BBLO ff 
IFLO fff  IFff 


6. 6
Simple Model for Antenna
• Antenna: I ↔ E, H

7. 7
First Cell-phone
• Dr. Martin Cooper in Motorola
Thin phone: 7.1 [mm]
Motorola RAZR

8. 8
Intennas for 3G Phone
• Internal antenna: The antenna is in a
phone. You can’t see it.
• A metal pattern is served as an antenna.

9. 9
Smartphone Antennas
←raymaps.com

10. 10
Smartphone HW: AP
• Application Platform Chip
– AP: Application Processor
– Flash memory
– Mobile Dynamic RAM
– PMU: Power Management Unit
– Audio Codec
– Bluetooth
– WiFi

11. 11
Smartphone HW: CP
• Connectivity Platform Chip
– CPU: Central Processing Unit
– DSP: Digital Signal Processing
• RF baseband processing
• Voice processing
– PA: Power Amplifier
– Tx-Rx switch
– DAC + ADC

12. 12
Openmoko Project
• Open source mobile phone project
UART: Universal Asynchronous Rx/Tx
SDIO: Secure Digital I/O
GPIO: General Purpose I/O
I2C: Inter-Integrated Circuit

13. 13
Nexus5 Block Diagram