JPH05110331A - Microstrip antenna provided with liquid crystal display device - Google Patents

Abstract

PURPOSE:To provide the microstrip antenna in which a liquid crystal display device is built in. CONSTITUTION:The antenna is constituted of a case 2 to which a liquid crystal material is packed, a plane earth electrode 3 provided to one side of a case outer peripheral face, a liquid crystal display pattern electrode 5 provided to one side of an inner peripheral face in the case 2 so that the case 2 to be sandwitched together with the plane earth electrode 3, a transparent plane patch electrode 4 provided to an outer peripheral face opposite to the face to which the plane earth electrode 3 is provided, and a lead wire connected to the plane patch electrode 4 and the pattern electrode 5 for the liquid crystal display. Thus, the microstrip antenna and the liquid crystal display function are realized by one element.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a microstrip antenna, and more particularly to a microstrip antenna having a liquid crystal display function.

[0002]

BACKGROUND ART Currently, a microstrip antenna is used to receive radio waves in the GHz band, and a liquid crystal display element or the like is used to display information at that time. But,
The entire size of the microstrip antenna is determined by the tuning frequency, and the liquid crystal display element cannot be unnecessarily downsized because of the tradeoff of the display function. Therefore, for example, a portable communication device having a microstrip antenna and a liquid crystal display element has a problem in downsizing.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a microstrip antenna having a liquid crystal display function.

[0004]

A microstrip antenna with a liquid crystal display according to the present invention comprises a case of a rectangular parallelepiped filled with a liquid crystal material, a flat ground electrode provided on one surface of the outer peripheral surface of the case, and The pattern electrode for liquid crystal display provided on one surface of the inner peripheral surface of the case so as to sandwich the case together with the planar ground electrode, and the surface on which the planar ground electrode is provided. A transparent flat patch electrode provided on the opposite outer peripheral surface, the flat patch electrode, and the liquid crystal display pattern.
And a conductive wire connected to each of the battery electrodes. With the above-described structure, the present invention realizes the microstrip antenna and the liquid crystal display function by one element.

[0005]

Embodiments of the present invention will now be described in detail with reference to the drawings. In the microstrip antenna with a liquid crystal display according to the present invention shown in FIGS. 1 and 2, the liquid crystal 1
Is filled in the case 2 having a rectangular parallelepiped shape. A planar ground electrode 3 is provided on one main surface of the outer peripheral surface of the case 2, and a transparent planar patch electrode 4 is provided on the outer peripheral surface opposite to the one main surface. A pattern electrode 5 for liquid crystal display is provided on one main surface of the inner peripheral surface of the case 2 so as to sandwich the case 2 together with the planar ground electrode 3. A conductive wire 6 is joined to the planar ground electrode 3. The tip of the conductive wire 7 reaches the through hole of the plane patch electrode 4 through the first through hole provided in each of the case 2 and the plane ground electrode 3 and further through the liquid crystal 1, and this tip is the plane patch. It is joined to the electrode 4. Further, the conductive wire 8 is joined to the pattern electrode 5 through the second through holes provided in the case 2 and the planar ground electrode 3, respectively. The flat ground electrode 3 and the first and second through holes of the case 2 are filled with sealants 9 and 10 in order to prevent the liquid crystal, which is a fluid substance, from flowing out.

To drive the liquid crystal display, an AC voltage for driving the liquid crystal of, for example, 100 Hz or less is applied to the conductive wire 7, and the conductive wire 8 is driven.
A display information signal is applied to. By the voltage application at this time, an AC electric field is generated in the dielectric 1 through the flat patch electrode 4 and the pattern electrode 5. The dielectric constant of the liquid crystal changes depending on the strength of this AC electric field. Here, the wavelength λ of the tuning frequency of the microstrip antenna is determined by the following equation.

[0007]

[Equation 1]

However, L is the length of one side of the planar patch electrode 4, and ε is the dielectric constant of the dielectric 1. Therefore, by adjusting the AC voltage value applied between the conductive lines 7 and 8, the dielectric 1
It is possible to obtain an arbitrary tuning frequency by changing the dielectric constant of. The received signal has a high frequency in the GHz band, for example, and is extracted from the conductive lines 6 and 7 by a separating means such as a high pass filter.

[0009]

As described above, since the microstrip antenna according to the present invention has a built-in display function, it is possible to reduce the size of, for example, a portable communication device having the microstrip antenna and the display function.

[Brief description of drawings]

FIG. 1 is a perspective view of a microstrip antenna with a liquid crystal display according to the present invention.

FIG. 2 is a sectional view of a microstrip antenna with a liquid crystal display according to the present invention.

[Explanation of symbols for main parts]

 1 Liquid crystal 2 Case 3, 4, 5 Electrode 6, 7, 8 Conductive wire 9, 10 Sealant

Claims (1)

[Claims] 1. A case filled with a liquid crystal material, and a flat ground electrode provided on one surface of the outer peripheral surface of the case,
A pattern electrode for liquid crystal display provided on one surface of the inner peripheral surface of the case so as to sandwich the case together with the flat surface electrode, and a surface provided with the planar ground electrode. Is a transparent flat patch electrode provided on the opposite outer peripheral surface, and a conductive line connected to each of the flat patch electrode and the liquid crystal display pattern electrode. Strip antenna.