JPS5859607A - Microstrip antenna - Google Patents

Abstract

PURPOSE:To suppress an unnecessary higher order mode, by providing feeding points of adjacent antennas to location deviating from the center of each antenna in opposite direction. CONSTITUTION:To feeding points P111 and P112 and P121 and P122 which are provided to microstrip antennas 11 and 12, respectively, in such a way that one point is moved by 90 deg. to the center O on each antenna, signals having phase relationships of 0 deg., 90 deg., 90 deg., and 180 deg. are supplied from an electric power distributor 20. Radio waves of circular polarized ones are generated from each microstrip antenna 11 and 12. The distributions of the lowest order mode surface electric currents of the circular polarized waves are the same in phase at both antennas and, therefore, they strengthen with each other. On the contrary, the circular polarized waves due to the distributions of the secondary higher order mode surface electric current at both antennas become opposite in phase and, therefore, they deny with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microstrip antenna, and particularly to an unnecessary high-order mode that is excited together with a desired mode when it is arranged in an array and operates as a circularly polarized wave over a wide band. The present invention relates to a microstrip antenna that suppresses lever O excitation.

In general, microstrip antennas O**@a are extremely narrow.

Conventionally, this has been achieved by increasing the thickness of the base I[O, lowering the dielectric constant of the dielectric O, etc. Iku I strip antenna O I am trying to widen the band.

By the way, when a microstrip antenna is made to have a wide band and becomes larger, in addition to the high-power Nando mode or the desired higher-order mode, there is also a special resonance near the double-power Nando mode or the desired higher-order mode O1m resonance jl liquid number. Unnecessary higher-order modes having frequencies are also excited, causing problems such as deterioration of the characteristics of the resulting circularly polarized waves.

The same holds true for nine microstrip antennas arranged in an array.

However, since then, no countermeasures against the unnecessary high-order code follow-up excitation have been considered.

In view of the above-mentioned actual situation, this is a good idea, and INK that is arrayed and operates with circularly polarized waves in a wide band, suppresses unnecessary higher-order modes that appear harmful, and stabilizes the circular The purpose of the present invention is to provide a microphone systrip antenna that obtains polarized waves.

According to the present invention, the microstrip antenna has a round feeding point bear that obtains circularly polarized waves and has an increased thickness of the substrate. , one pair of adjacent metal elements) @ child (bare array element) 90 @ (degrees) of rotational displacement, and 90 of the feed point bears of each of the bare array elements. By exaggerating the rotational displacement of .degree., the unnecessary higher-order modes are suppressed by setting the power feeding conditions to the feeding points, which have a symmetrical positional relationship between the elements, to have equal amplitude and opposite phase.

Hereinafter, a microstrip antenna according to the actual vIK will be described in detail with reference to embodiments of the accompanying drawings.

Please refer to Figure K111 and Figure 2 to get started! Ikustrip Antenna O Tomb will be explained.

The microstrip ant-t-
to feeding point PI>! It is assumed that a circularly polarized wave is obtained from this microstrip antenna by supplying amplitude power having a phase difference of 90''0 to P2 and P2.

However, i is the antenna center point To〉, the feeding point Pla is placed at any position on the stone wall, and the feeding point P2 company'6] I is the position corresponding to the above feeding point PI on the bell (OPI depth''6P2
location). t>, the above gA+IIJ:
O1 [efl intersect.

For example, if the lowest order code (first order code) is the desired order code,
If the above feed point P1 is excited at the lowest order mode, ζ
V Iku Award Strip Antenna Of! The current distribution on both sides is as shown in Figure 1. If the above-mentioned lowest-order mode is excited and is large, the unnecessary high-order mode with the most influential non-resonant high-order mode, that is, the unnecessary high-order mode whose natural resonant frequency is closest to the above-mentioned maximum order mode OIl's resonant frequency, is The second-order high-order antenna is used, and the microst call antenna is used for wideband 41
It is also stimulated by the 2nd iris, the 2nd water, and the 2nd water.

Surface current distribution based on this second-order higher-order wave 1st @I
(C) Mode showing K and tk. Furthermore, the above unnecessary high-order peak (in this example, the second water high-order peak) is excited by the induced back electromotive force, as shown in 18@). generates a surface current distribution.

Next, the pigeon coop with the feed point P2 excited in the lowest order mode described above (+90 with respect to the feed point PiOall vibration condition)
The current distribution of this microslip anti-10 table is as shown in Figure 1←) and 1. &.

Below, Figure 1 (f) Th! Is Figure 111 (2) the corresponding power feeding point? According to 201111KJllt, it is the second higher order wave that occurs in the ζO microphone p strip antenna.
The induced (2
(order excitation) and shows the current distribution between the lowest order
'e Ashi, above-mentioned Figure 1 (e) A and No. 111411
)K correspond to each other.

Now, the above feeding points P1 and P! By simultaneously applying the above-mentioned excitation to the microchip antenna, circularly polarized waves are generated in principle.

However, when paying attention to the directionality of the current distribution of each IIWi mentioned above, as is clear from Figure 1-) to
Mode (lowest order mode) surface current distribution (Figure 1 (b)
(see (e)) and the biased IEO quadrature direction and the negative higher order mode (second water higher order mode) K induced by the nine desired mode (lowest order mode) lI! Based on the two current distributions (see Figure 111-) and ω), it can be seen that the polarization O is in the opposite direction of rotation. In other words, the polarized component rotating in the opposite direction Wc is cross-polarized. The ζO cross bias is applied to the positive and negative wave components obtained above.

No. 2 @-) indicates No. 111(a)K above! 9G for the feed points Pi and I'2 of the Eclestrip antenna
This shows a microstrip antenna in which feeding points P3Th and P4 are arranged with a rotational displacement of
佽）The phase of the power supplied to the microstrip antenna shown in K is the phase of the power supplied to the microstrip antenna shown in FIG. It is assumed that the phase of the power supplied to the power supply point P4 (see Figure 2C) is exactly opposite in phase (phase difference 180°) tcl.

Now, when excitation is applied to each of the feeding points P3 and P4 of the microstrip antenna, the lowest degree of curvature of the scissors O1! l! Both current distribution, second water higher order wall-do of
1N! The two current distributions and the lowest order current distributions induced (secondary excitation) by this second water height peak are shown in Figures 2 (b) to 5) and 2 (e) to 2, respectively. −
ll shown in! Becomes a hut. However, these Figure 2-)~(
2) corresponds to ?) to &6 shown in FIG. 1, respectively, and the detailed explanation thereof will be omitted.

In other words, in this microphone so-called strip antenna,
By discussing the above-mentioned nine excitations simultaneously for the feed points pss+- and P4, a stone that generates a predetermined O circularly polarized wave is
Unnecessary higher order mode (second water higher order mode) owhvavc
At the same time, cross-polarized waves, which are generated and are harmful to great circularly polarized waves, also occur at the same time.

Next, let's make the microstrip antenna shown in FIG. 1 and the nine-microphone strip antenna shown in FIG. 2 simultaneously vibrate for Km as a pair array element.

In this case, Figures 1 (b) to (2)) and Figure 2 (b)
As is clear from ~ω, the lNN electric current of the forged low-order arc is divided by Fig. 1), ←) and Fig. 2>, <e>.
[) Is the circular bias due to K the same phase as tk? hand! The second water high-order wave is induced (!-order excitation) by the second water high-order wave, and the ninth lowest-order wave is 01! Cross-polarized components due to the surface current distribution (see 1 ml), ω (see FIG. 2), and (2)) have opposite phases and mutually cancel each other.

ζO, a pair array element is constructed by attaching two O micros wrap antennas that operate circularly polarized waves over a wide band with a displacement of 9G@OB, and By setting the power supply conditions to the respective power supply points, which are in symmetrical position relation with each other by providing a transverse position, to equal amplitude and opposite phase to each other, unnecessary higher-order modes can be spread. Banknotes can be suppressed.

1. It goes without saying that the above-mentioned 9.4 also applies in the case of suppressing any "relaxed, even-ordered, high-order walls."

Before, Section 115(a)
By setting up multiple O feed points on the top of the tower, the current distribution is similar to 411, and the current distribution is %0? It is sufficient to set up a plurality of power supply points on the 6C wire and apply the interrupted power supply conditions to each of these power supply points at once.

1ksP1 Om! For convenience, the beak (Fig. 4) and 211 (a) K indicate each feeding point Pi, P2Th, and P.
3. Place the P40 at the center point of each *
*Although it is important to note that the placement positions of each power supply point P1 and P20 do not necessarily have to be at the same distance from each other, that is, each of these power supply points Pl.

? 2 and P3,? As long as at least one of the power supply points 4 is at a bias position opposite to each other, a sufficient tortoise effect can be obtained by appropriately considering the power supply conditions described above.

This is what Mr. Kameoka said about the case where the power supply points mentioned above are number II.

Now, in order to obtain circularly polarized waves, the miter strip antenna according to the present invention is formed by applying the above-mentioned principle to the miter strip antenna which can be formed into an O array.
As shown in the figure.

In FIG. 3, W is a microphone strip antenna that can be arrayed, and an element (element antenna) U and one element mu, which become a pair array element, and these elements tt, 1
2 and the group 1[13 and 0 IIK are shown intervening 1%1% dielectric. As shown in the same No. 311, the lip antenna W is formed into an O array with nine microcouses), and has a large O element usp and a separator. !
1, P 122 ﾾete ill, @tlko0! Iku four-stroke strip antenna 1o IIi base 1 [130 thicker and larger], or' stages such as lowering the electrical conductivity of the above-mentioned electric body OII, etc., and widening the band appropriately, t9, power divider 20 Mori above power feeding points p 111 , P112 .

P121 and p122 are provided with electric power under predetermined conditions to form an array of mital strip antennas Wt.
It is assumed that four equilinear powers are supplied at once under the phase condition O indicated by lK. In other words, the feeding point? A predetermined amplitude power of Hiro phase 0"0 is supplied to 111 K, and the power supply point de 11
For 2, supply phase +90' 0 predetermined amplitude power,
Feeding point p 121 For wc, the same phase as Hiro +*o”o
TokorojI! Il@supply power, feed point de l! 2, the Hiro phase +180@D predetermined Il@power is supplied.

As a result, the micros lip antenna 10, the feed point pair consisting of the above feed points P111 and P112, and the above feed point 1' 121 and P122 are formed. Based on Kuhara Kan, we will emphasize the above-mentioned Seishiho-de 01111 and remove unnecessary higher-order walls.
IL is arranged according to the direction (cross polarized liquid component OIL raw)
For convenience, the explanation for suppressing 0 or more is given in the case of left-handed circular deviation *0, but in the case of right-handed circular deviation *0, the same thing can be achieved by reversing the phase rotation O direction. I can say that.

It is assumed that a stable large circularly polarized liquid is radiated from this arrayed large microstrip antenna lO.

In addition, the above-mentioned microphone strip antenna 10
In the case of multi-element design, the elements shown in Figure 113 can be used as basic elements to form an array as shown in Figures 411 and 5.

The embodiment shown in FIG. 3 is a coaxial feeding type in which each power output from the power divider is supplied to the microphone strip antenna 10 via a coaxial line. Any other power supply method may be used as long as it satisfies the above power supply conditions.

Furthermore, the A-turn shape of the elements 11 and 12t) should be symmetrical with respect to the working axis in the vibration direction (as an example, it should not be defined as a large circle shown in FIG. 3).

1ksIP1 In the microphone strip antenna according to the present invention, the number of feeding points, the positional relationship, and each feeding condition are not unique. It can also be effectively applied when obtaining a polarized liquid.

As described above, according to the microphone strip antenna according to the present invention, even-order O
It is possible to obtain good TNS* without being affected by the violent effects of the low-level high-order mode.

[Brief explanation of drawings]

Figure 4 and Diagram 2 Hiro A diagram showing the microphone-strip antenna OJ according to the present invention, Figure 3 from Hiromoto @! Ikustrip antenna〇1 example ■, 4th cabinet and 1g5 diagram relate to the real 91IK! It is a figure which shows the other O Example of an Iku prize strip antenna. 1G-ff Iku ■ Strip antenna, 11.12-・
Elements, low substrates, and power dividers. Figure 1 (G) (b) (C) (e) (f) (d) (9) Figure 2 (Q) (b) (c) (e) (f) (d) (9) 3rd Figure 1n Figure 4

Claims (1)

[Claims] a) A microstrip antenna Ks? that is composed of a plurality of element antennas and operates with circularly polarized waves. and l1ff respectively to obtain the circularly polarized wave in each element antenna.
At least one of the two power supply units O connected to I
II) A microphone-strip antenna, characterized in that it can be arranged in a substantially opposite position with respect to the meeting element antenna. C) The two feeding parts are placed at the center of the element antenna to obtain the circularly polarized wave.
The microphone-strip antenna according to claim 011, wherein the antenna is disposed in a perpendicular direction J and at a close distance from each other. 0) The power feeding section arranged in the above-mentioned opposite position is arranged at a position equidistant from the center of each element antenna O, and has a ratio of 9%. Microphone strip antenna. ■ Patent claim O@s where the power supply unit consists of a single power supply point
Section ■I! O microphone - strip antenna. 6) Patent claim o1 in which the power feeding unit includes a plurality of power feeding points
Ov equal strip antenna described in 111jla. (can) Patent claim e, wherein the electric power supplied to the power supply unit is arranged at biased positions in mutually opposite directions, and the electric power supplied to the power supply unit is electric power in mutually opposite positions.
The microstrip antenna described in sim iris (2). (7) Patent claim 0, wherein the power supplied to the power supply unit disposed at the biased position in the opposite direction is equal to II@0 power.
The microstrip antenna described in Section 111111(6).・) The microstrip antenna according to claim OSm (part 1), in which the electric power supplies are supplied to the power feeding units disposed at zero deviation positions in opposite directions to each other and have opposite phases and bias amplitudes.