LSQ976-NR-1-0-20-R18 datasheet(22/50 Pages) MICROCHIP

tên linh kiện	LSQ976-NR-1-0-20-R18

Giải thích chi tiết về linh kiện	Wireless Security Remote Control Development Kit User?셲 Guide

PDF	50 Pages

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nhà sản xuất	MICROCHIP [Microchip Technology]

Trang chủ	http://www.microchip.com

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22 / 50 page

Wireless Security Remote Control Development Kit User’s Guide

DS41646A-page 22

 2012 Microchip Technology Inc.

FIGURE 3-2:

PCB TOP LAYER PHOTO

Figure 3-3 shows the bottom layer of the PCB. The bottom layer shows the PCB loop

antenna and the PCB traces for the conductive push buttons from the plastic enclosure.

FIGURE 3-3:

PCB BOTTOM LAYER PHOTO

3.4

PCB ANTENNA DESCRIPTION

The PCB antenna is a combination of top and bottom PCB layer traces, as shown in

Figure 3-4. The feed point from the transmitter is on the right side of the figure. It is a

top layer trace shown in red. It taps into the PCB loop antenna on the bottom layer

shown in blue. The antenna loops to the left side of the PCB and is terminated to ground

by a capacitor.

The PCB antenna is an “electrically small loop antenna.” That is, the wavelength of the

antenna is very much less than the one-quarter wavelength that antennas are normally

designed to. This type of antenna has an extremely high quality factor (Q). Therefore,

it is very susceptible to parasitic impedances and very challenging to impedance match

to the transmitter.

LSQ976-NR-1-0-20-R18 bảng dữ liệu(PDF) 22 Page - Microchip Technology