KR20020061208A - Aperture Coupled Cross-Slot Circular Polarization Microstrip Patch Antenna for PCS Terminal and Mobile Communication - Google Patents

Abstract

PURPOSE: An aperture coupled cross slot circularly polarized wave micro strip patch antenna is provided to protect human body from electromagnetic interference by permitting antenna to be directed outward, while improving transmitting/receiving efficiency regardless of the position of terminal. CONSTITUTION: A micro strip patch antenna comprises a feeder line installed at the lowermost end through a printing method; an antenna substrate(3) and a cross slot arranged onto the feeder line, wherein the cross slot has an open center; and a radiation patch(1) arranged together with a radiation dielectric member onto the resultant structure. The distance between slots is lambda/4 wavelength of operating frequency so as to form a phase difference of 90 degree, thus generating a circularly polarized wave. The slots are formed to be symmetrical centering from the feeder line.

Description

Aperture Coupled Cross-Slot Circular Polarization Microstrip Patch Antenna for PCS Terminal and Mobile Communication}

Until now, the antenna for PCS terminals uses both monopole antennas, whose main purpose is transmission, and helical antennas, whose purpose is reception. In the situation where design prioritizes efficacy, and furthermore, insisting on efficiency only in a situation where it becomes small and light weight, it can be said that it is far behind the demand of the times. In order to solve this problem, some of the antennas installed inside the terminal are in progress, but when the antenna itself is separated from the terminal, it may have some characteristics, but when it is installed with various circuit elements in the terminal, It can be expected that the characteristics of the antenna will decrease due to mutual interference between the antenna and the terminal circuit elements.

Therefore, the present invention antenna is an antenna that can solve the practicality and efficiency as described above. When the antenna part touches the ground when it is dropped due to inconvenience and carelessness, the entire terminal may be discarded due to the damage of the antenna part. Due to its location, it can cause a fatal harm to the human body due to electromagnetic waves, which is the most concern, and thus it has been much controversial.

Therefore, since the antenna of the present invention is a flat antenna, there is no need to worry about the disposal of the terminal due to the damage of the antenna by installing the antenna on the folder surface of the terminal in the case of the folding type and the flip of the terminal in the case of the flip type. Since the location of the face toward the outside of the face can minimize the effects of the human body due to electromagnetic waves, it is a solution to the problem that is a major controversy in the world today about the effect of electromagnetic waves from the PCS terminal on the human body. .

In the principle of the microstrip patch antenna, an electron source becomes a radiation source at two radiation edges of a rectangular or circular radiation patch, and the main beam is configured to copy in the upper direction of the radiation patch by the Hoigens principle. The input impedance is largely affected by the width of the patch, and the operating frequency is greatly affected by the length. The parameters that determine the characteristics of the antenna include the length and width of the radiation patch, the dielectric constant, the length and width of the slots, the length of the stub, and the resonant frequency, impedance, bandwidth, and coupling size of the antenna vary with each parameter change. . The relative dielectric constant εr of the antenna substrate affects the bandwidth and the radiation efficiency of the antenna. Lower permittivity has a wider impedance bandwidth and can reduce surface wave generation. The parameter for determining the resonance frequency of the antenna is determined by the length L of the radiation patch, and the width W of the radiation patch is related to the resonance resistance of the antenna. The wider the patch width, the lower the resistance value.

The circularly polarized flat antenna of the present invention has a random position, so that the terminal can be received at any position, but also, it is possible to receive a circular polarization without the linear polarization generally used in the PCS terminal in order to invent an antenna having excellent transmission efficiency. The purpose of the present invention is to invent an aperture coupled cross-slot microstrip patch antenna which has excellent transmission characteristics against environmental changes such as rainy weather and generates circular polarization considering the randomness of installation and location. There is this.

1 is a radiation patch used in a typical patch antenna

Figure 2 is a radiation patch proposed in the present invention in order to minimize the fringing effect generated in the radiation patch edge, which is one of the problems of the patch antenna, a band-type parasitic element is installed outside the radiation patch.

3 is an opening slot structure proposed in the present invention, in order to generate a circular polarization, the distance between slots is given a distance of λ / 4 wavelength of operating frequency so that the phase difference of 90 ° may be provided. Designed to achieve vertical symmetry.

4 is a structure in which power is fed by a microstrip line as a feed line.

<Description of the symbols for the main parts of the drawings>

1: Radiating Patch

2: parasitic element

3: antenna dielectric layer (Antenna Substrate)

4: Slot for opening the opening

5: Ground Plane

6 Coupling Point

7: Feed Substrate

8: Feeding Point

When described in detail with the accompanying drawings as follows.

2, 3, and 4 combined with the feed line of Figure 4 characteristic impedance 50Ω at the bottom of the microstrip substrate and the cross slot of FIG. 3 at the top to install the signal excited on the feed line through the slot electromagnetic The signal is transmitted to the topmost radiation patch of FIG. 2 by the coupling, and the electromagnetic signal propagates in space through the radiation patch. In addition, in order to solve the narrow band problem of the conventional single-layer patch antenna, a stack structure and a band-type parasitic element are installed around the radiation patch to increase the bandwidth. When the slot of Figure 3 is based on the feed line is designed to achieve symmetry up, down, left and right. The invented antenna has a random position of the PCS terminal so that it can be received at any position, but in order to invent an antenna having excellent transmission efficiency, it excludes the linear polarization generally used in the PCS terminal and generates a circular polarization, which causes rainy weather. The invention has invented an Aperture Coupled Cross-Slot Microstrip Patch Antenna having excellent transmission characteristics in the same environment and generating circular polarization in consideration of installation and positional randomness. It can be used not only in PCS but also in various places of mobile communication such as IMT200. There are various methods of generating circular polarization, such as the method of double feeding and the method of cutting the diagonal edges of the radiation patch. However, the antenna of the present invention has a slot-to-slot distance of λ / 4 and a 90 ° angle. The phase difference can be achieved.

Helical and monopole antennas used in existing PCS terminals are difficult to manufacture due to their complex structure, but microstrip antennas are easy to manufacture, can be mass-produced by printed circuit technology, and they are small in size and light in weight. Although there is a difference in transmission / reception efficiency due to the position of the terminal due to the existing linear polarization, the antenna of the present invention has an advantage that the arbitrary position of the terminal is not affected by generating a circular polarization. In addition, when the antenna part first touches the ground due to inconvenient portability due to protruding outside of the PCS terminal, a problem may occur that destroys the entire terminal due to damage to the antenna part. When used in handsets, mass production is possible, the risk of damage is eliminated, and the current controversy is expected to explode as the electromagnetic wave problem is increasing.

Claims (3)

In the invention of the microstrip antenna, the feeder line is installed at the bottom by a printing technique, the cross-shaped slot with the center of the slot open with the dielectric layer is installed, and the radiation patch is installed with the radiation dielectric on the top to form a laminated structure. Steps to The slot according to claim 1, wherein an opening slot constitutes a cross slot having an open slot center having a phase difference of 90 ° with a slot-to-slot distance of λ / 4. Configuring the slot as shown in Figure 3 on the grounding conductor plate to be symmetrical The method of claim 1, wherein the parasitic element in band form is installed around the radiation patch and the radiation patch.