7

G5Y-1

G5Y-1

The separation between the strip line and each ground pattern

should be approximately the same as the strip line width.

• Conductive patterns should be designed to be as short as

possible. Meandering of the strip transmission line will

adversely affect the high-frequency characteristics of the

relay.

• Each ground pattern should be designed to be as wide as

possible so as not to generate a potential difference between

ground patterns.

• Avoid directing of conductive lines in the area of the PC

board on which the relay bottoms, as this can result in short-

circuiting.

s EXAMPLES OF PACKAGING DESIGN

Since these examples are presented with an eye to low cost

packaging, expensive packaging methods, such as thru-hole

connection, are not described. For this reason, the

characteristics of each circuit board should be checked

thoroughly before putting it to practical use.

The method of packaging using paper epoxy type double-

sided PC board.

The dielectric constant of a paper epoxy type double-sided PC

board is considered to be approximately the same as that of a

glass epoxy type PC board

The width of a strip transmission line is as follows:

Unit mm (inch)

Thickness of

Impedance

Width of

PC board

(

Ω)

strip line

1.6 (0.06)

50

2.7 (0.11)

75

1.3 (0.05)

1.0 (0.04)

50

1.7 (0.07)

75

0.8 (0.03)

s HOW TO DESIGN PC BOARD

The figure above shows the conductive pattern side. The

microstrip connected to the contact terminal must be of the

above-mentioned pattern width. Ensure that the distance

between microstrip and each ground pattern is approximately

the same as the width of the microstrip. Connect with jumpers

between the top and bottom of the pattern at the points

marked “X” in the figure. The greater the number of jumper

points, the better the high-frequency characteristics. In this

manner, an isolation of 65 to 75 dB at 500 MHz or 50 dB at

900 MHz can be obtained. In this case, the components

mounting side of the PC board is entirely the ground pattern.

Remove the pattern around each of the contact terminals and

coil terminal in size 2.0x2.0 mm (0.08 x 0.08 in).

The method of packaging using a single-sided PC board

When a relay is mounted on a single-sided PC board, an

isolation of only 60 to 70 dB can be obtained at 200 MHz.

Therefore, to permit the relay on the single-sided PC board in

a higher frequency range, a metallic plate can be inserted

between the PC board and the relay, then connected to the

ground pattern.

As seen in the figure to the left, a metallic plate is sandwiched

between the relay and the PC board to connect to the pattern.

The key is that the ground terminal of the Type G5Y-1 relay,

the bent tabs A of the metallic plate, and the ground pattern

must be soldered together at one time.

This combination of a low-cost, single-sided PC board and a

low-cost, metallic plate, provides the same high-frequency

characteristics as when the relay is mounted on a double-

sided PC board.

By grounding the ground terminal of the Type G5Y-1 relay and

the metallic plate at the same place, excellent high-frequency

characteristics can be obtained.

In this method, the metallic plate must adhere firmly to the PC

board. The design of strip transmission lines should be the

same as when a double-sided PC board is employed.

CAUTION:

A key point in mounting the relay on a single-sided PC

board is to ensure that the relay base is not floating

above the PC board or metallic plate, but bottoms

firmly upon them.

Note:

In the interest of product improvement, specifications

are subject to change.