CN204408289U - The hand-held frequency spectrograph of shortwave - Google Patents
The hand-held frequency spectrograph of shortwave Download PDFInfo
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- CN204408289U CN204408289U CN201520121193.6U CN201520121193U CN204408289U CN 204408289 U CN204408289 U CN 204408289U CN 201520121193 U CN201520121193 U CN 201520121193U CN 204408289 U CN204408289 U CN 204408289U
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Abstract
The utility model discloses the hand-held frequency spectrograph of a kind of shortwave, comprise filter circuit, described filter circuit comprises the second-order filter circuit of connecting successively, quadravalence filter circuit, 6th rank filter circuit and the 8th rank filter circuit, the input of second-order filter circuit and output are connected to the first rank filter circuit and the 3rd rank filter circuit, the input of the 6th rank filter circuit and output are connected to the 5th rank filter circuit and the 7th rank filter circuit, the output of the 8th rank filter circuit is connected with the 9th rank filter circuit, second-order filter circuit, quadravalence filter circuit, 6th rank filter circuit and the 8th rank filter circuit are capacitor and inductor series filtering circuit, first rank filter circuit, 3rd rank filter circuit, 5th rank filter circuit, 7th rank filter circuit and the 9th rank filter circuit are LC parallel filtering circuit, the input of the first rank filter circuit is connected with resistance, it solves in prior art narrow, broadband clutter recognition problem.
Description
Technical field
The utility model relates to frequency spectrograph field, more particularly, relates to a kind of hand-held frequency spectrograph of shortwave of good wave filtering effect.
Background technology
Existing hand-held frequency spectrograph bandwidth of operation is broadband type, and because the interference signal in shortwave frequency range is many especially, in order to receive purer signal, must add filter in antenna end could filtering clutter.The filter added by radio frequency leading portion of existing hand-held frequency spectrograph is one group of broadband low-pass filter, circuit structure as shown in Figure 1, and it can not the filtering clutter of coming in from antenna well.Fig. 2 is the analogous diagram of the low pass filter of the 1.6-30MHz shown in Fig. 1, and as seen from Figure 2, it can only the later clutter of filtering 30MHz, can not carry out filtering to the clutter in shortwave band.
Utility model content
The utility model provides a kind of shortwave hand-held frequency spectrograph, solves narrow/wide band clutter recognition problem in prior art.
The technical scheme in the invention for solving the above technical problem is:
The hand-held frequency spectrograph of shortwave, comprise filter circuit, described filter circuit comprises the second-order filter circuit of connecting successively, quadravalence filter circuit, 6th rank filter circuit and the 8th rank filter circuit, the input of described second-order filter circuit and output are connected to the first rank filter circuit and the 3rd rank filter circuit, the input of the 6th described rank filter circuit and output are connected to the 5th rank filter circuit and the 7th rank filter circuit, the output of the 8th described rank filter circuit is connected with the 9th rank filter circuit, described second-order filter circuit, quadravalence filter circuit, 6th rank filter circuit and the 8th rank filter circuit are capacitor and inductor series filtering circuit, the first described rank filter circuit, 3rd rank filter circuit, 5th rank filter circuit, 7th rank filter circuit and the 9th rank filter circuit are LC parallel filtering circuit, the input of the first described rank filter circuit is connected with resistance.
Capacitor and inductor series filtering circuit and electric capacity and inductance are in series, and the not common end of electric capacity is as signal input part, and the not common end of inductance is as signal output part.LC parallel filtering circuit and inductance and electric capacity are in parallel.
The filter of existing frequency spectrograph adopts nine rank low pass filters, its filter effect is not good, the utility model improves on the basis of existing technology, be capacitor and inductor series filtering circuit by the filter circuit on its pair of rank by original LC parallel filtering circuits improvement, the capacitor filter of single-order is improved to LC parallel filtering circuit, its filter effect is better than existing filter circuit, and can carry out filtering to the clutter in shortwave band.
As preferably, also comprise antenna, multiway combined type band pass filter and band switch control circuit, described multiway combined type band pass filter comprises filter circuit and the second multi-channel rf electronic switch that the first multi-channel rf electronic switch, the multichannel filtering frequency range that connect successively are a Continuous Band, the input of the first described multi-channel rf electronic switch is connected with antenna, and the first described multi-channel rf electronic switch and the second multi-channel rf electronic switch are all connected on band switch control circuit.The filtering frequency range of multichannel filtering circuit is that a Continuous Band can represent that the filtering frequency range of multichannel filtering circuit is non-overlapping continuously in this frequency range, also can represent there is overlapping filtering frequency range between adjacent filter circuit.The switch of band switch control circuit to the first multi-channel rf electronic switch and the second multi-channel rf electronic switch is utilized to carry out switching controls, the signal that antenna receives sends to follow-up circuit successively after the first multi-channel rf electronic switch, filter circuit and the second multi-channel rf electronic switch, its circuit structure is simple, economical, radio frequency electric switch is utilized to realize the switching of switch, its switching time is fast, and control mode is simple.
Further, the first described multi-channel rf electronic switch and the second multi-channel rf electronic switch are eight road radio frequency electric switches, and described filter circuit has eight tunnels.
Further, the electric capacity of described filter circuit and inductance are high temperature difference device.
To sum up, the beneficial effects of the utility model are:
1, the capacitor filter of single-order is improved to LC parallel filtering circuit by the utility model on the basis of existing filter circuit, be capacitor and inductor series filtering circuit by the filter circuit on two rank by original LC parallel filtering circuits improvement, its filter effect is better than existing filter circuit, and can carry out filtering to the clutter in shortwave band.
2, frequency spectrograph of the present utility model adopts the first multi-channel rf electronic switch and the second multi-channel rf electronic switch to select filter circuit, and utilize the path of band switch control circuit to the first multi-channel rf electronic switch and the second multi-channel rf electronics to carry out selection control, its switching time is fast, and control mode is simple.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of existing frequency spectrograph filter circuit.
Fig. 2 is the analogous diagram of existing frequency spectrograph filter circuit.
Fig. 3 is the circuit diagram of filter circuit of the present utility model.
Fig. 4 is the analogous diagram of filter circuit of the present utility model at 5 ~ 6.5MHz.
Fig. 5 is the theory diagram of the utility model frequency spectrograph.
Fig. 6 is the emulation time delay figure of frequency spectrograph of the present utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, 5 ~ 6.5MHz is not making the every other embodiment obtained under creative work prerequisite, all belongs to the scope of the utility model protection.
Embodiment 1:
The hand-held frequency spectrograph of a kind of shortwave as shown in Figure 3, comprise filter circuit, described filter circuit comprises the second-order filter circuit of connecting successively, quadravalence filter circuit, 6th rank filter circuit and the 8th rank filter circuit, the input of described second-order filter circuit and output are connected to the first rank filter circuit and the 3rd rank filter circuit, the input of the 6th described rank filter circuit and output are connected to the 5th rank filter circuit and the 7th rank filter circuit, the output of the 8th described rank filter circuit is connected with the 9th rank filter circuit, described second-order filter circuit, quadravalence filter circuit, 6th rank filter circuit and the 8th rank filter circuit are capacitor and inductor series filtering circuit, the first described rank filter circuit, 3rd rank filter circuit, 5th rank filter circuit, 7th rank filter circuit and the 9th rank filter circuit are LC parallel filtering circuit, the input of the first described rank filter circuit is connected with resistance.The present embodiment improves on the basis of existing technology, be capacitor and inductor series filtering circuit by the filter circuit on its pair of rank by original LC parallel filtering circuits improvement, the capacitor filter of single-order is improved to LC parallel filtering circuit, its filter effect is better than existing filter circuit, and can carry out filtering to the clutter in shortwave band.
Embodiment 2:
The hand-held frequency spectrograph of a kind of shortwave as shown in Figure 3 and Figure 5, the present embodiment is further optimized on the basis of embodiment 1, namely also antenna is comprised, multiway combined type band pass filter and band switch control circuit, described multiway combined type band pass filter comprises the first multi-channel rf electronic switch connected successively, multichannel filtering frequency range is filter circuit and the second multi-channel rf electronic switch of a Continuous Band, the input of the first described multi-channel rf electronic switch is connected with antenna, the first described multi-channel rf electronic switch and the second multi-channel rf electronic switch are all connected on band switch control circuit.
The first described multi-channel rf electronic switch and the second multi-channel rf electronic switch are eight road radio frequency electric switches, and described filter circuit has eight tunnels.The present embodiment adopts radio frequency electric switching over eight tunnel segmented filter filtering, and as shown in Figure 3, the filtering frequency range of the present embodiment is at 1.6-30MHz.The filter effect of the filter circuit in embodiment 1 is emulated, as shown in Figure 4, the filter that have selected 5-6.5 MHz emulates, can find out from simulation result, below 4MHz and more than 8MHz can suppress more than 70dB, so just inhibit most of clutter in shortwave band, solve a difficult problem of the prior art.The frequency spectrograph be made up of the filter circuit of embodiment 1, its circuit structure is simple, economical, and switching time is fast, and time delay is little, and control mode is simple.As shown in Figure 6, be that the decay time of 5 ~ 6.5MHz band pass filter emulation is 6.85us, add the switching time of two group of 8 road radio frequency electric switch, be less than 7 us.The 8 groups of band pass filters that utilize of the present embodiment screen receiving from antenna the signal come, the clutter of filtering except useful signal, thus the useful signal display that reception can be made is clean, clear speech.
Band switch control circuit is selected filtering frequency range, to receive the signal of this band frequency of 3.5-5.0MHz, radio-frequency (RF) switch automatically switches to 3.5-5.0MHz this section of bank of filters with this band frequency set by band switch control circuit and carries out filtering, can the clutter of (1-2.5MHz) below more than two frequencys multiplication of the filtering 3.5MHz clutter (second harmonic) of (7.0-80MHz) and the two divided-frequency of 5.0MHz, degree of suppression is greater than 50dB.
Embodiment 3:
The hand-held frequency spectrograph of a kind of shortwave as shown in Fig. 3, Fig. 5, the present embodiment is optimized on the basis of above-described embodiment, and electric capacity and the inductance of namely described filter circuit are high temperature difference device.The multiple filter of existing civilian frequency spectrograph realizes the filtering to a Continuous Band, due to present adopted device, the frequency drift that temperature between each frequency range is brought across difference, its stability is not high, need equipment overlapped frequency bands between its adjacent two filtering frequency ranges, such as will realize continuous filtering frequency range is 1.6-5.0MHz, realize with 3 filters, then the filtering frequency range of 3 filters can be set to successively: 1.6-2.2 MHz, 2.0-3.5 MHz and 3.3-5.0 MHz.The present embodiment adopts high temperature difference device, can ensure each frequency range steady operation in various environment, namely adopts high temperature difference device, can realize the working method that the utility model directly switches between section point and section point, improves the stability of frequency spectrograph.Existing device, its range of temperature is-10 DEG C ~+70 DEG C, and the range of temperature of the high temperature difference device of the present embodiment is or is better than-40 DEG C ~+85 DEG C, and its temperature varying coefficient is high, effectively can improve the stability of frequency spectrograph.
As mentioned above, the utility model can be realized preferably.
Claims (4)
1. the hand-held frequency spectrograph of shortwave, comprise filter circuit, it is characterized in that: described filter circuit comprises the second-order filter circuit of connecting successively, quadravalence filter circuit, 6th rank filter circuit and the 8th rank filter circuit, the input of described second-order filter circuit and output are connected to the first rank filter circuit and the 3rd rank filter circuit, the input of the 6th described rank filter circuit and output are connected to the 5th rank filter circuit and the 7th rank filter circuit, the output of the 8th described rank filter circuit is connected with the 9th rank filter circuit, described second-order filter circuit, quadravalence filter circuit, 6th rank filter circuit and the 8th rank filter circuit are capacitor and inductor series filtering circuit, the first described rank filter circuit, 3rd rank filter circuit, 5th rank filter circuit, 7th rank filter circuit and the 9th rank filter circuit are LC parallel filtering circuit, the input of the first described rank filter circuit is connected with resistance.
2. the hand-held frequency spectrograph of shortwave according to claim 1, it is characterized in that: also comprise antenna, multiway combined type band pass filter and band switch control circuit, described multiway combined type band pass filter comprises filter circuit and the second multi-channel rf electronic switch that the first multi-channel rf electronic switch, the multichannel filtering frequency range that connect successively are a Continuous Band, the input of the first described multi-channel rf electronic switch is connected with antenna, and the first described multi-channel rf electronic switch and the second multi-channel rf electronic switch are all connected on band switch control circuit.
3. the hand-held frequency spectrograph of shortwave according to claim 2, is characterized in that: the first described multi-channel rf electronic switch and the second multi-channel rf electronic switch are eight road radio frequency electric switches, and described filter circuit has eight tunnels.
4. the hand-held frequency spectrograph of the shortwave according to Claims 2 or 3, is characterized in that: the electric capacity of described filter circuit and inductance are high temperature difference device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520121193.6U CN204408289U (en) | 2015-03-02 | 2015-03-02 | The hand-held frequency spectrograph of shortwave |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520121193.6U CN204408289U (en) | 2015-03-02 | 2015-03-02 | The hand-held frequency spectrograph of shortwave |
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| CN204408289U true CN204408289U (en) | 2015-06-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105141272A (en) * | 2015-06-30 | 2015-12-09 | 云南电网有限责任公司昆明供电局 | Power filter circuit and power filter for broadband power line carrier communication test system |
| CN108768440A (en) * | 2018-05-31 | 2018-11-06 | 西安蜂语信息科技有限公司 | Signal processing method and device |
| CN111610365A (en) * | 2020-05-09 | 2020-09-01 | 深圳市火乐科技发展有限公司 | Spectrum analysis device and spectrum analysis method |
-
2015
- 2015-03-02 CN CN201520121193.6U patent/CN204408289U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105141272A (en) * | 2015-06-30 | 2015-12-09 | 云南电网有限责任公司昆明供电局 | Power filter circuit and power filter for broadband power line carrier communication test system |
| CN108768440A (en) * | 2018-05-31 | 2018-11-06 | 西安蜂语信息科技有限公司 | Signal processing method and device |
| CN111610365A (en) * | 2020-05-09 | 2020-09-01 | 深圳市火乐科技发展有限公司 | Spectrum analysis device and spectrum analysis method |
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