Card-Type Wireless Communication Device Antenna Interference
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Solution Overview
Problem
Conventional card-type wireless communication devices experience deteriorated communication performance due to mutual interference between HF band coil antennas and UHF band dipole antennas, limiting the size of the coil antenna within the constraints of an IC card format.
Innovation Solution
A card-type wireless communication device design that includes a support base material with a coil antenna for HF band signals and a dipole antenna for UHF band signals, where the dipole antenna's configuration minimizes interference by positioning its open end close to the coil antenna's edge via a linear part, allowing for a larger coil antenna size while maintaining communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the coil antenna size is increased within the limited IC card dimensions, then the HF band signal transmission capability is improved, but the available space for the dipole antenna is reduced
Solution Approach 1:
The ground pattern utilizes the two-dimensional plane of the IC card substrate to create electromagnetic field control zones that do not occupy additional physical space. By operating in the electromagnetic field dimension rather than physical space dimension, the system allows larger coil antenna area without reducing dipole antenna area
2Area of stationary object
If the coil antenna and dipole antenna are arranged close to each other to maximize card utilization, then the space efficiency is improved, but mutual interference increases and communication performance deteriorates
Solution Approach 1:
The ground pattern acts as an intermediary that enables close proximity arrangement of the coil antenna and dipole antenna while preventing harmful mutual interference. It creates electromagnetic field boundaries that allow spatial efficiency without sacrificing performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively suppresses interference between the antennas, enabling reliable communication performance across both frequency bands while ensuring a larger coil antenna size within the limited dimensions of an IC card, expanding the signal transmission/reception range.
Implementation Method 1
a coil antenna disposed on the support base material and configured for transmitting and receiving signals in a first frequency band
Implementation Method 2
a dipole antenna disposed on the support base material outside the coil antenna and configured for transmitting and receiving signals in a second frequency band higher than the first frequency band
Data Source
AI summary
A card-type wireless communication device is provided that suppresses a deterioration in communication performance of the dipole antenna while ensuring a larger coil antenna size in a limited card size. The card-type wireless communication device includes a coil antenna and a dipole antenna. The dipole antenna includes first dipole element including a first connection end connected to a second-frequency-band RFIC element, first linear part that extends from the first connection end along an outer edge of the coil antenna, and a first open end facing the outer edge of the coil antenna via the first linear part. Moreover, a second dipole element includes a second connection end connected to second-frequency-band RFIC element, and a second open end at a position farther from the outer edge of the coil antenna than a shortest distance between the first linear part and the outer edge of the coil antenna.