RF LAYOUT Application Guide RF LAYOUT Application Guide Version: RF LAYOUT_Application Guide_V2.2 Date: 2016-02-26 Sunivision Technology Development Co.
RF LAYOUT Application Guide Table of contents Document History ................................................ ...................................................... ...................................................... .................2 Table of Contents ................................ ...................................................... ...................................................... ................................. 3 Picture Index... ......................................................
RF LAYOUT Application Guide image index Figure 1: Module RF Reference Schematic ............................................... ...................................................... ............................................... 6 Figure 2: Schematic diagram of coplanar waveguide structure ................................................ ...................................................... ............................................... 7 Figure 3: Schematic diagram of two-layer board LAYOUT...........
RF LAYOUT Application Guide 1 Introduction This document mainly introduces the PCB routing precautions of the module's peripheral RF circuit to help customers to correctly carry out when using the Quectel module. RF part PCB layout design to ensure RF performance, reducing customer design cycles. This document applies to all Quectels LTE modules. Support Bands : LTE Band 2/4/5/12 Sunivision Technology Development Co.
RF LAYOUT Application Guide 2 RF Interface Schematic Recommendations Figure 1: Module RF Reference Schematic Among them, C1, R1, and C2 are reserved matching circuits to optimize the performance of the antenna port. The default values are: R1 is pasted with 0R resistor; C1 is not pasted; C2 is not pasted. Sunivision Technology Development Co.
RF LAYOUT Application Guide 3 50 Ohm Characteristic Impedance Coplanar Waveguide Structure Design It is recommended to use the coplanar waveguide microwave transmission form, and the characteristic impedance is 50 ohms, as shown in Figure 2. Figure 2: Schematic diagram of the coplanar waveguide structure 4.2ΓΏ4.6, take here The main factors affecting the characteristic impedance of coplanar waveguides are the dielectric constant of the substrate (usually 4.
RF LAYOUT Application Guide 0.8mm 0.8mm 0.18mm 1.0mm 0.8mm 0.17mm 1.2mm 0.8mm 0.16mm 1.6mm 0.8mm 0.15mm 2mm 0.8mm 0.14mm If it is a 2-layer board, the signal layer is the Top layer, and the reference ground is the Bottom layer, as shown in Figure 3 below. If it is a 4-layer board, the reference ground can be the 2nd Layer, Layer 3 or Layer 4.
RF LAYOUT Application Guide 4 Coplanar Waveguide PCB LAYOUT Examples and Precautions Figure 6: PCB LAYOUT The example diagram combined with the numbers in the figure above, there are 6 points to be noted: 1. Control the line width W and spacing S corresponding to the 50 ohm coplanar waveguide. Take the common PCB board as FR4 medium (dielectric constant is 4.
Warning & Statement: This module meets the requirements of Part 15 Subpart B, FCC CFR Title 47 Part 2. Integration is strictly limited to fixed categorized end-products where a separation distance of at least 20 cm between the radiating part and any human body can be assured during normal operating conditions. This module only allows connection antenna in the instruction manual. If other antennas are used, re-evaluation is required.
