CN202352835U

CN202352835U - Antenna capable of switching electric wave polarization direction, and circuit

Info

Publication number: CN202352835U
Application number: CN2011203547021U
Authority: CN
Inventors: 黄乐
Original assignee: Shanghai Kostal Huayang Automotive Electric Co Ltd
Current assignee: Shanghai Kostal Huayang Automotive Electric Co Ltd
Priority date: 2011-09-21
Filing date: 2011-09-21
Publication date: 2012-07-25
Anticipated expiration: 2021-09-21

Abstract

The utility model discloses an antenna capable of switching an electric wave polarization direction, and a circuit. A main body of the antenna is a substrate, one side of the substrate is provided with a first feed point 1 and a second feed point 2, the first feed point 1 and the second feed point 2 are respectively provided with an inverted F antenna, and the inverted F antennae are symmetric along a diagonal line of the substrate and are connected with the circuit through a feed microstrip line. The utility model has the beneficial effects that four states of electric control are completed by using two DC voltages, thus complexity, response time and cost for realizing control logic is reduced, communication quality is ensured under the more complex wireless communication condition; and the antenna has smaller size structure so as to be conveniently integrated with a communication device circuit, and is convenient for application of handheld equipment.

Description

The antenna of changeable polarization of the e direction and circuit

Technical field

The utility model relates to wireless communication technology field, specially refers to a kind of antenna and circuit of changeable polarization of the e direction.

Background technology

Be widely used in fields such as smart mobile phone and automobile monitoring recently along with wireless communication technology, antenna configuration has been proposed many new requirements, comprise miniaturization and high efficiency.Antenna is wanted enough small and exquisite being easy to carry, and wants simultaneously to guarantee that higher gain reduces consumption of electric.Because the user is to the placement of equipment and grip the randomness of situation, the polarized state of antenna cannot be predicted, thereby be difficult to avoid because the signal quality that the polarization of the e loss brings descends.

Existing polarization of the e switched antenna structure is merely able to partial polarization is switched, and such as switching the left-handed and dextrorotation in the circularly polarised, perhaps can only switch linear polarization and circular polarization.In addition, the size of existing polarization of the e switched antenna structure is bigger, generally needs the area (λ is a wavelength) of λ/2x λ/2.Also have, general RF switching circuit uses 2 direct voltages to control 2 kinds of assembled state of two RF feedback points.The circuit of 4 kinds of assembled state of two distributing points does not appear controlling through two direct voltages.

In sum, to the defective of prior art, need a kind of antenna and circuit and method of changeable polarization of the e direction especially, with the problem of mentioning more than solving.

The utility model content

The purpose of the utility model is to provide a kind of antenna and circuit and method of changeable polarization of the e direction, controls the circuit of 4 kinds of assembled state of two distributing points through two dc offset voltages, thereby realizes the purpose of the utility model.

The technical problem that the utility model solved can adopt following technical scheme to realize:

A kind of antenna of changeable polarization of the e direction and circuit is characterized in that,

The main body of said antenna is a substrate; The one side of substrate is provided with the first distributing point FeedPoint 1 and the second distributing point FeedPoint 2; Being separately installed with one on the said first distributing point FeedPoint 1 and the second distributing point FeedPoint 2 falls-the F antenna; Said fall-F antenna links to each other with circuit through the feed microstrip line along the diagonal symmetry of substrate;

Said circuit comprises the first distributing point FeedPoint 1 and the second distributing point FeedPoint 2, dc offset voltage V1 and V2, high-frequency signal input and output RF, diode D1～D5, triode T1 and T2, inductance L 1, L2 and L3, capacitor C 1～C7;

Be in series with capacitor C 1, capacitor C 2, diode D2, inductance L 1, diode D3, inductance L 2, inductance L 3, capacitor C 3 and capacitor C 4 successively between the said first distributing point FeedPoint 1 and the second distributing point FeedPoint 2; Be connected with the diode D1 of a ground connection between said capacitor C 1 and the capacitor C 2, be connected with the diode D4 of a ground connection between inductance L 2 and the inductance L 3, be connected with the diode D5 of a ground connection between capacitor C 3 and the capacitor C 4;

Connect dc offset voltage V1 between said capacitor C 2 and the diode D2; Said dc offset voltage V1 is through capacitor C 5 ground connection, and the base stage of connection triode T1, the grounded emitter of triode T1; The utmost point electrode of triode T1 connects diode D1, and connects dc offset voltage V2;

Connect high-frequency signal input and output RF through capacitor C 6 between said diode D3 and the inductance L 2, and connect the base stage of triode T2, the grounded emitter of triode T2, and connect diode D5; Triode T2 collector electrode connects dc offset voltage V2, and dc offset voltage V2 is through capacitor C 7 ground connection.

Further, the construction size of said antenna is λ/4* λ/4.

The beneficial effect of the utility model is: only utilized 2 direct voltages to accomplish the electrical control of 4 kinds of states; Complexity, response time and cost that control logic realizes have been reduced; Can under complicated more radio communication condition, guarantee the quality of communication; Having less dimensional structure simultaneously can be integrated with the communication period device circuitry easily, is convenient to the application of handheld device.

Description of drawings

Fig. 1 is the sketch map of described antenna of the utility model and distributing point.

Fig. 2 is the simulation architecture figure of described antenna of the utility model and distributing point.

Fig. 3 is the described electrical block diagram of the utility model.

Fig. 4 is the axial ratio direction simulation result figure of the utility model.

Fig. 5 is the round right-handed circular polarization simulation result figure of the utility model.

Fig. 6 is the vertical polarization directions figure simulation result figure of the utility model.

Embodiment

For technological means, creation characteristic that the utility model is realized, reach purpose and be easy to understand understanding with effect, below in conjunction with embodiment, further set forth the utility model.

As depicted in figs. 1 and 2; The antenna and the circuit of the utility model described one changeable polarization of the e direction comprise antenna and circuit two parts, and the main body of said antenna is a substrate; The one side of substrate is provided with the first distributing point FeedPoint 1 and the second distributing point FeedPoint 2; Be separately installed with one on the said first distributing point FeedPoint 1 and the second distributing point FeedPoint 2 and fall-the F antenna, said fall-F antenna links to each other with circuit through the feed microstrip line along the diagonal symmetry of substrate;

As shown in Figure 3, said circuit comprises the first distributing point FeedPoint 1 and the second distributing point FeedPoint2, dc offset voltage V1 and V2; High-frequency signal input and output RF; Diode D1～D5 is having under the situation of forward bias voltage, can let high-frequency signal pass through; Do not having to be open circuit under the situation of forward bias voltage, hindering passing through of high-frequency signal; Triode T1 and T2; Inductance L 1, L2 and L3 play inhibition for high-frequency signal, but DC component can directly be passed through; Capacitor C 1～C7 can directly pass through for high-frequency signal, but hinders passing through of DC component; The antenna of λ/4 has transformation to load impedance when high frequency, such as, if load impedance is under the state of short circuit, the input of transmission line can be regarded as open-circuit condition.

The voltage of two direct voltages (V1 and V2) through input just makes up; The electrical characteristic of distributing point can be switched transformation between these 3 states of feed, open circuit and short circuit, the polarization of transmitting-receiving electric wave respectively corresponding level, vertical, left-handed and these 4 kinds of modes of dextrorotation.As shown in the table:

The relation of combination of table 1 feeding classification and radiation characteristic

Visible through table 1, arbitrary combination always has a distributing point to be in feed condition.And the another one distributing point is an open-circuit condition, and corresponding-F antenna also can be participated in radiation, thereby forms the effect of circular polarization.And if another one distributing point short-circuit condition is fallen accordingly-the F antenna will can not participate in radiation, thereby form the effect of linear polarization.

(1) the high V2-of V1-is low

For the RF signal, can pass through D2, D3 and D4.Because D4 links to each other with ground, high-frequency signal will all reflect, and through after the impedance conversion of L2, become open-circuit condition, so right-hand member is to not influence of RF.Equally, because the effect of L3, after the short-circuit condition conversion of D4, FeedPoint2 can regard open circuit as.

(2) the low V2-of V1-is high

The RF signal does not receive the influence of D4, D5 and T2, directly to FeedPoint2 feedback point.FeedPoint1 is in short-circuit condition owing to receive the effect of D1.

(3) the high V2-of V1-is high

T2 is in conducting state under the effect of V1 and V2, D4 and D5 also are in conducting state.Therefore, FeedPoint2 is at this moment by short circuit.T1 also is in conducting state under the effect of V1 and V2, the last bias voltage of D1 is approximately zero, and this moment, FeedPoint1 was in feed condition.

(4) the low V2-of V1-is low

Because not conducting of D2, FeedPoint1 is in open-circuit condition, and the FeedPoint2 end does not receive the influence of D3 and D4 and T2, is in feed condition.

Fig. 4-Fig. 6 is the checking result; Because structure is that diagonal is symmetrical completely; After providing the result of (1) FeedPoint1 feed+FeedPoint2 open circuit (right-handed circular polarization) and (2) FeedPoint1 feed+FeedPoint2 short circuit (perpendicular polarization), the radiation characteristic under other two kinds of situation also just can have been understood.

More than show and described basic principle of the utility model and the advantage of principal character and the utility model.The technical staff of the industry should understand; The utility model is not restricted to the described embodiments; The principle of describing in the foregoing description and the specification that the utility model just is described; Under the prerequisite that does not break away from the utility model spirit and scope, the utility model also has various changes and modifications, and these variations and improvement all fall in the utility model scope that requires protection.The utility model requires protection range to be defined by appending claims and equivalent thereof.

Claims

1. the antenna of a changeable polarization of the e direction and circuit is characterized in that,

2. the antenna of a kind of changeable polarization of the e direction according to claim 1 and circuit is characterized in that, the construction size of said antenna is λ/4* λ/4.