Inverted-F PCB Antenna Data Sheet

Product Overview

A PCB antenna dedicated to the TWELITE series, designed for small tags.

Features

• Composed of a copper foil pattern on a printed circuit board (FR-4), enabling a compact, thin, and cost-effective design (antenna characteristics improve with compact design).
• Dedicated antenna for the TWELITE series (TWE-L-WX / MW-R-WX / MW-G-WX) (cannot be connected to coaxial connector types).

Standard Installation Method

• To obtain similar radio wave characteristics (omnidirectional) in all directions, install vertically as shown in the figure. For details on omnidirectionality, refer to the section “Directivity”.

• When installed horizontally, omnidirectionality cannot be obtained.

Outline Drawing, Dimensions, and TWELITE Mounting Diagram

• Hatched area: copper foil formed on the printed circuit board.
• PCB substrate material: FR-4 (unchangeable)
• PCB substrate thickness: 0.5 [mm], 0.8 [mm], 1 [mm], 1.6 [mm] There are restrictions on the antenna pattern, PCB substrate thickness, and substrate material for radio certification. For details, refer to the section “About Radio Certification”.
• The antenna pattern is optimized for a PCB substrate thickness of 1 [mm], so characteristics slightly change if the substrate thickness differs. However, these changes are usually minimal. Characteristic patterns on a board based on an ideal GND size show changes of about 1–3 [dB].

Specifications

Note 1: This is the radio certification application value based on measurements in all directions and may differ from the maximum value in the directivity chart below.

Directivity

Directivity Measurement Method 1 (Standard Installation Method)

• Measure the vertical plane

• Vertical plane directivity

• Rotation direction of the measurement target and measurement angle

Directivity Measurement Method 2

• Measure the horizontal plane

• Horizontal plane directivity

• Rotation direction of the measurement target and measurement angle

Note: 0 [dB] on the directivity chart corresponds to the gain of a standard dipole antenna. Note: TWELITE was mounted on a printed circuit board measuring 32.75 [mm] × 26.00 [mm] with a substrate thickness of 1 [mm], and gain and directivity were measured.

About Radio Certification

There are restrictions on the antenna pattern, PCB substrate material, and substrate thickness for radio certification.

• In Japan, radio certification applications are made under the following conditions:

  1. Antenna pattern: design as shown in <Figure: Outline Drawing and Dimensions>
  2. PCB substrate material: FR-4
  3. PCB substrate thickness: 0.5 [mm], 0.8 [mm], 1.0 [mm], 1.6 [mm]
  4. Target modules: TWE-L-WX, MW-R-WX, MW-G-W

• Outside Japan (FCC, CE), radio certification applications are made under the following conditions:

  1. Antenna pattern: design as shown in <Figure: Outline Drawing and Dimensions>
  2. PCB substrate material: FR-4
  3. PCB substrate thickness: 1 [mm]
  4. Target module: TWE-L-WX

• For details, please refer to the URL below.

  https://twelite.gitbook.io/general/radio-cert/design-revf-ant