CN204408323U

CN204408323U - A kind of multistage tuning bandpass filtering antenna tuning network

Info

Publication number: CN204408323U
Application number: CN201520116509.2U
Authority: CN
Inventors: 范波; 张晨辉; 何振东; 韩珂
Original assignee: Xianyang Guangtong Electronics Science & Technology Co Ltd
Current assignee: Xianyang Guangtong Electronics Science & Technology Co Ltd
Priority date: 2015-02-17
Filing date: 2015-02-17
Publication date: 2015-06-17
Anticipated expiration: 2025-02-17

Abstract

A kind of multistage tuning bandpass filtering antenna tuning network, belongs to electronic products manufacturing technology field in radio station's emitter.Its technical characteristics between corresponding coil and coil, is electrically connected with electric capacity with the secondary resonance loop that coil and electric capacity connect to form successively in the primary resonant loop connected to form successively by coil and electric capacity, between coil is connected with electric capacity, coil is connected in primary resonant loop, the other end of coil is connected with antenna, feeder line is drawn by the coil of secondary resonance loop, and primary resonant loop is connected on identical ground wire with secondary resonance loop.The utility model circuit structure is simple, cheap for manufacturing cost, can substantially improve the linearity that signal exports after using, and improve the coupling bandwidth of network, carrier frequency is mated more, inhibits the interference of side frequency simultaneously.Adopt two aspectant installation forms of coil, make the magnetic flux of two coils reach best, lightning protection effect is better.

Description

A kind of multistage tuning bandpass filtering antenna tuning network

Technical field

The utility model relates to a kind of medium wave radiating antenna allotting network, and specifically a kind of multistage tuning bandpass filtering antenna tuning network, belongs to electronic products manufacturing technology field in radio station's transmitter.

Background technology

At present, the antenna matching network in medium wave broadcasting transmitting antenna-feedback system, mainly contains the allotting networks such as T-shape, " Γ " type and " π " type in traditional concocting method, and this allotting network in use has very large restricted.Along with the enlarging in city, soil contradiction in short supply day by day highlights, medium-wave antenna floor space needs to reduce, antenna height needs to reduce, but also to ensure that medium-wave antenna can not reduce in performance and parameter, so, for the midband frequency of medium wave frequency range within 531KHz ~ 800KHz, after the T-shape of traditional approach, " Γ " type and " π " type allotting network coupling, during its VSWR≤1.2, bandwidth is too narrow, and when not reaching VSWR≤1.2 of the present regulation of country, bandwidth should be more than or equal to the technical requirement of 9KHz.Also have the technical requirement of future digital Broadcast Development in addition, namely during VSWR≤1.2, band is wider than 20KHz.So, be badly in need of will developing a kind of new antenna tuning network to adapt to the needs in antenna height reduction and future digital Broadcast Development.

Utility model content

The purpose of this utility model is to solve the inadequate and future digital broadcast requirement to bandwidth at the lower Time Bandwidth of antenna height of traditional antenna tuning network, thus proposes a kind of new technical scheme.

For realizing above-mentioned object, the utility model realizes by following technical scheme:

A kind of multistage tuning bandpass filtering antenna tuning network, it is made up of LC resonant tank, between corresponding coil and coil, electric capacity is electrically connected with the secondary resonance loop that coil and electric capacity connect to form successively in the primary resonant loop connected to form successively by coil, electric capacity, coil and coil, in primary resonant loop, be connected to coil between coil is connected with electric capacity, the other end of coil is connected with antenna; Feeder line is drawn by the coil of secondary resonance loop; Primary resonant loop is connected on identical ground wire with secondary resonance loop.

Be be part access point at coil access point in the connection of primary resonant loop coil and coil, the input port of feeder line is part access point at coil access point.

The utility model is compared with prior art advantageously: circuit structure is simple, cheap for manufacturing cost, due at the front end of this circuit and end by the direct ground connection of coil, make the lightning protection effect of whole circuit better; The utility model by tuned-primary, second harmonic, thus has carried out splendid coupling to carrier frequency; Inhibit the interference of side frequency, it is more stable for relative legacy network, and bandwidth is wider simultaneously; Under the condition of VSWR≤1.2, the matching strip of the coupling bandwidth ratio legacy network of network is wider than 20KHz; Antenna parameter because of external environment change time, because the coupling bandwidth of network is very wide, normally work so transmitter can not be affected; Due to the good wave filtering effect of whole circuit, if also have other operating frequency on radio station, this circuit does not need increase uptake pathway or clogging networks to eliminate the interference between each frequency; Adopt two aspectant installation forms of coil, make the magnetic flux of these two coils reach best, improve the efficiency of whole Circuits System.The adjustable side of these two coils is in same plane, easy to adjust, and the linearity is good, and being independent of each other to the real part of circuit, imaginary part Independent adjustable facilitates radio station and detect and safeguard.

Accompanying drawing explanation

Accompanying drawing is the utility model circuit theory diagrams.

Embodiment

Now with specific embodiment, the utility model is described in further details by reference to the accompanying drawings:

A kind of multistage tuning bandpass filtering antenna tuning network, it is the coil 2 that has been installed in series in the lower end of antenna 1, its effect is the imaginary part offsetting a part of antenna impedance, the other end of coil 2 is connected with coil 3, the other end earth connection 11 of coil 3, between coil 2 and ground wire 11, be installed in parallel coil 3, its effect is the real part promoting antenna impedance, also has lightning protection effect simultaneously.Coil 3 is connected with a pole of electric capacity 4 with the common port of coil 2, another pole of electric capacity 4 is connected with coil 5, electric capacity 4 can play with coil 5 effect regulating antenna Q value while the effect playing lightning protection, Q value to be controlled 1 ~ 4 time the most desirable at this point.Coil 3, electric capacity 4, coil 5 and coil 6 form primary resonant loop; The other end wiring circle 6 of coil 5, a pole of coil 6 one termination capacitor 7, other end earth connection 11.Another pole wiring circle 8 of electric capacity 7, the secondary resonance loop that coil 8 and electric capacity 9 compose in parallel, parallel resonance is on carrier frequency point.Coil 6 and coil 8 access point are part access point, and coil 8 and electric capacity 9 form secondary resonance loop, reach the final coupling of network and improve the object of bandwidth and filtering, due to the lower terminate ground wire 11 of coil 6, coil 8, also having lightning protection effect simultaneously; Coil 8 access point is the input port of feeder line 10.Coil 6 and coil 8 adopt two aspectant connection forms of coil, make the magnetic flux of these two coils reach best, improve the efficiency of whole communication system.

Operation principle:

Utilize antenna lower end series coil to offset the imaginary part of a part of antenna impedance, for the Q value realizing control circuit plays a role; Utilize over the ground bridging coil to improve the real part of antenna impedance, for the Q value realizing control circuit plays a role; Utilize coil ground connection to improve the lightning protection capability of whole system; Utilize multistage coupling and Chebyshev filter theory, to improve bandwidth and the filter function of network.

As can be seen here, be that one is widely used multistage tuning bandpass filtering network in the technical development of the utility model and future digital broadcast miniaturized at medium-wave antenna.

Claims

1. a multistage tuning bandpass filtering antenna tuning network, it is made up of LC resonant tank, it is characterized in that: by coil (3), electric capacity (4), the primary resonant loop that coil (5) and coil (6) connect to form successively is electrically connected with electric capacity (7) with the secondary resonance loop that coil (8) and electric capacity (9) connect to form successively between corresponding coil (6) and coil (8), between coil (3) is connected with electric capacity (4), coil (2) is connected in primary resonant loop, the other end of coil (2) is connected with antenna (1), feeder line (10) is drawn by secondary resonance loop coil (8) is upper, primary resonant loop and secondary resonance loop are connected on identical ground wire (11).

2. the multistage tuning bandpass filtering antenna tuning network of one according to claim 1, it is characterized in that: be part access point at coil (6) access point in the connection of primary resonant loop coil (5) and coil (6), the input port of feeder line (10) is part access point at coil (8) access point.