Radio frequency acquisition preprocessing equipment

Abstract

The utility model discloses a radio frequency acquisition preprocessing device, which relates to the technical field of radio frequency signal receiving, solves the problem of low integration level of the existing ultra-wideband superheterodyne receiver, and is characterized by comprising a local oscillator unit and a receiving unit, wherein the local oscillator source is connected with the first power divider, the first power divider is respectively connected with the frequency doubler and the frequency tripler, the frequency tripler is connected with the second power divider, the second power divider is respectively connected with the frequency hopping source and the dot frequency source, the frequency hopping source is connected with the frequency doubler, the first power divider outputs first frequency doubling, the frequency doubler outputs second frequency doubling, and the dot frequency source outputs second frequency doubling. The second divider outputs third frequency multiplication, the frequency multiplier outputs fourth frequency multiplication, and the dot frequency source outputs fifth frequency multiplication; the first frequency multiplication, the second frequency multiplication and the third frequency multiplication are connected with the frequency conversion processing unit to provide a vibration source, the fourth frequency multiplication is connected with the first frequency mixing unit to provide a vibration source, and the fifth frequency multiplication is connected with the second frequency mixing unit to provide a vibration source; the integration level of the ultra-wideband superheterodyne receiver is improved by sharing a local oscillator source and a processing channel.

Description

Technical Field

[0001] The utility model relates to the technical field of radio frequency signal reception, and more specifically, to radio frequency acquisition preprocessing equipment. Background Art

[0002] The RF receiver mainly completes the reception, filtering, amplification, mixer down-conversion and other processing of RF signals. The mainstream receiver on the market is the superheterodyne receiver. The superheterodyne receiver converts the in-band signal from the RF to the intermediate frequency through the mixer, and then performs bandpass filtering, automatic gain and other processing on the intermediate frequency for down-conversion.

[0003] However, for a 0.38-40GHZ ultra-wideband superheterodyne receiver, it is often necessary to divide it into multiple frequency bands for processing, such as 0.38-2GHZ, 2-6GHZ, 6-18GHZ, 18-30GHZ, and 30-40GHZ. On the one hand, the mixing requirements of each frequency band are different, and multiple local oscillator sources need to be configured, resulting in a large device size and high cost. On the other hand, each frequency band uses independent channel processing, and the device integration is low.

[0004] To this end, the inventor provides a radio frequency acquisition preprocessing device to solve the above problems. Utility Model Content

[0005] The present application aims to solve the problem of low integration of existing ultra-wideband superheterodyne receivers and provides a radio frequency acquisition preprocessing device, which improves the integration of ultra-wideband superheterodyne receivers by sharing a local oscillator source and a processing channel.

[0006] This application is implemented through the following technical solutions:

[0007] A radio frequency acquisition preprocessing device comprises a shielding shell and an electronic device inside the shielding shell;

[0008] The electronic device comprises a local oscillator unit and a receiving unit, wherein the local oscillator unit provides an oscillation source for the receiving unit;

[0009] The receiving unit includes a frequency conversion processing unit, a harmonic processing unit, a first frequency mixing unit, an intermediate frequency processing unit, a second frequency mixing unit and an intermediate frequency output unit connected in sequence;

[0010] The local oscillator unit is connected to the frequency conversion processing unit, the first frequency mixing unit and the second frequency mixing unit to provide a local oscillator source;

[0011] Wherein, the local oscillator unit includes a local oscillator source, a first power divider, a frequency doubler, a frequency tripler, a second power divider, a frequency hopping source, a point frequency source and a frequency multiplier, the local oscillator source is connected to the first power divider, the first power divider is respectively connected to the frequency doubler and the frequency tripler, the frequency tripler is connected to the second power divider, the second power divider is respectively connected to the frequency hopping source and the point frequency source, the frequency hopping source is connected to the frequency multiplier, the first power divider outputs a first frequency multiplication, the frequency doubler outputs a second frequency multiplication, the second power divider outputs a third frequency multiplication, the frequency multiplier outputs a fourth frequency multiplication, and the point frequency source outputs a fifth frequency multiplication;

[0012] The first frequency multiplication, the second frequency multiplication and the third frequency multiplication are all connected to the frequency conversion processing unit to provide a vibration source, the fourth frequency multiplication is connected to the first frequency mixing unit to provide a vibration source, and the fifth frequency multiplication is connected to the second frequency mixing unit to provide a vibration source.

[0013] By adopting the above technical solution, all local oscillator signals required by the receiving processing unit are provided by one local oscillator unit, which simplifies the setting of the local oscillator source and is conducive to reducing the cost of equipment; the wide-band RF signals share the same processing channel after frequency conversion processing, which improves the integration of the equipment and is conducive to the miniaturization of the equipment.

[0014] Further, the frequency conversion unit includes a first switch and a first frequency conversion processing channel, a second frequency conversion processing channel, a third frequency conversion processing channel, a fourth frequency conversion processing channel and a fifth frequency conversion processing channel connected to the first switch;

[0015] The first frequency conversion processing channel includes a 0.38-2 GHZ passband filter, an amplifier, a filter, a mixer, a filter and an amplifier connected in sequence, and the mixer is connected to a first local oscillator signal;

[0016] The second frequency conversion processing channel includes a 2-6 GHZ passband filter, an amplifier, a filter, a mixer, a filter and an amplifier connected in sequence, and the mixer is connected to the first local oscillator signal;

[0017] The third frequency conversion processing channel includes a 6-18 GHZ passband filter, an amplifier and a filter connected in sequence;

[0018] The fourth frequency conversion processing channel includes an 18-30 GHZ passband filter, an amplifier, a filter, a mixer, a filter and an amplifier connected in sequence, and the mixer is connected to a third local oscillator signal;

[0019] The fifth frequency conversion processing channel includes a 30-40 GHZ passband filter, an amplifier, a filter, a mixer, a filter and an amplifier connected in sequence, and the mixer is connected to the second local oscillator signal.

[0020] Further, the harmonic processing unit includes a second switch and a first harmonic processing channel and a second harmonic processing channel connected to the second switch;

[0021] The first harmonic processing channel includes a 6-10 GHZ bandpass filter, an amplifier and a filter connected in sequence;

[0022] The second harmonic processing channel includes a 10-18 GHZ bandpass filter, an amplifier and a filter connected in sequence.

[0023] Furthermore, the first frequency mixing unit includes a third switch, a digitally controlled attenuator and a mixer which are connected in sequence, and the mixer is connected to a fourth local oscillator signal.

[0024] Furthermore, the first frequency mixing unit includes a third switch, a digitally controlled attenuator and a mixer which are connected in sequence, and the mixer is connected to a fourth local oscillator signal.

[0025] Furthermore, the second frequency mixing unit includes a fifth switch and a mixer connected in sequence, and the mixer is connected to a fifth local oscillator signal.

[0026] Furthermore, the intermediate frequency output unit includes a 1.8 GHZ passband filter, an amplifier and a digitally controlled attenuator which are connected in sequence.

[0027] Furthermore, the local oscillator source is a 12 GHZ local oscillator source, the frequency hopping source is a 16-20 GHZ frequency hopping source, and the point frequency source is a 23.8 GHZ and 29.3 GHZ point frequency source.

[0028] Furthermore, the local oscillator unit and the receiving processing unit are connected to the power supply through an electronic filter.

[0029] Furthermore, the first switch is used to access a 0.38-40 GHZ radio frequency source.

[0030] Compared with the prior art, the present application has the following beneficial effects: the local oscillator signal of the device is provided by a local oscillator source, which simplifies the setting of the local oscillator source and reduces the manufacturing cost of the device. The device converts the 0.38-40GHZ radio frequency signal to 6-18GHZ for centralized processing, realizes the sharing of processing channels, and improves the integration of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of the present application, and do not constitute a limitation on the embodiments of the present application. In the drawings:

[0032] Figure 1 A connection diagram of the radio frequency acquisition preprocessing device provided by the present invention;

[0033] Figure 2A schematic diagram of the structure of the frequency conversion processing unit provided by the present invention;

[0034] Figure 3 A schematic diagram of the structure of a harmonic processing unit provided by the present invention;

[0035] Figure 4 A schematic structural diagram of a first frequency mixing unit provided by the present invention;

[0036] Figure 5 A schematic diagram of the structure of the intermediate frequency processing unit provided by the present invention;

[0037] Figure 6 A schematic structural diagram of a second frequency mixing unit provided by the present invention;

[0038] Figure 7 This is a schematic diagram of the structure of the intermediate frequency output unit provided by the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0040] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to the other component.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] At present, the 0.38-40GHZ ultra-wideband superheterodyne receiver usually adopts frequency band processing, dividing 0.38-40GHZ into five frequency bands of 0.38-2GHZ, 2-6GHZ, 6-18GHZ, 18-30GHZ, and 30-40GHZ for independent processing, which has the problems of complex local oscillator source and low equipment integration.

[0043] Based on this, the inventor provides a radio frequency acquisition preprocessing device, which realizes the provision of the local oscillator signal of the device by sharing a 12GHZ local oscillator source, and realizes the sharing of processing channels by converting the radio frequency signal of 0.38-40GHZ to 6-18GHZ, thereby improving the integration of the device.

[0044] See also Figure 1 As shown, Figure 1 The figure is a connection diagram of the radio frequency acquisition preprocessing device. The radio frequency acquisition preprocessing device includes a shielding shell (not shown in the figure) and electronic devices inside the shielding shell; the electronic devices include a local oscillator unit and a receiving unit, and the local oscillator unit provides a local oscillator signal for the receiving unit; the receiving unit includes a frequency conversion processing unit, a harmonic processing unit, a first mixing unit, an intermediate frequency processing unit, a second mixing unit and an intermediate frequency output unit connected in sequence; the local oscillator unit is connected to the frequency conversion processing unit, the first mixing unit and the second mixing unit to provide a local oscillator signal;

[0045] Among them, the local oscillator unit includes a local oscillator source, a first power divider, a doubler, a tripler, a second power divider, a frequency hopping source, a point frequency source and a frequency multiplier. The local oscillator source is connected to the first power divider, the first power divider is respectively connected to the doubler and the tripler, the tripler is connected to the second power divider, the second power divider is respectively connected to the frequency hopping source and the point frequency source, the frequency hopping source is connected to the frequency multiplier, the first power divider outputs a first local oscillator signal, the doubler outputs a second local oscillator signal, the second power divider outputs a third local oscillator signal, the frequency multiplier outputs a fourth local oscillator signal, and the point frequency source outputs a fifth local oscillator signal; the first local oscillator signal, the second local oscillator signal and the third local oscillator signal are all connected to the frequency conversion processing unit, the fourth local oscillator signal is connected to the first mixing unit, and the fifth local oscillator signal is connected to the second mixing unit.

[0046] Specifically, the local oscillator source adopts a 12GHZ local oscillator source, which is divided into three balanced 12GHZ channels through the first power divider. The first channel directly provides the first local oscillator signal Q1, the second channel is connected to the doubler to generate 24GHZ to provide the second local oscillator signal Q2, and the third channel is input to the tripler to generate 36GHZ. The tripler is divided into three balanced 36GHZ channels through the second power divider, one channel provides the third local oscillator signal Q3, one channel is connected to the 16-20GHZ frequency hopping source and the frequency multiplier in sequence to generate an output of 32-40GHZ as the fourth local oscillator signal Q4, and one channel is connected to the 23.8 / 29.3GHZ point frequency source to generate outputs of 23.8 and 29.3GHZ as the fifth local oscillator signal Q5.

[0047] The receiving processing unit receives the RF signal of 0.38-40GHZ, converts the frequency to 6-18GHZ through the frequency conversion processing unit, performs harmonic processing through the harmonic processing unit, and then enters the first mixing unit for mixing. The intermediate frequency processing unit processes it into an intermediate frequency signal of 27 / 22GHZ, which is input into the second mixing unit for mixing. The intermediate frequency output unit processes it into an intermediate frequency signal of 1.8GHZ for output for subsequent processing.

[0048] It can be understood that compared with traditional multi-local oscillator source devices, the present invention provides all local oscillator signals required by the receiving processing unit through a local oscillator unit. The entire device only uses a 12GHZ local oscillator source, which simplifies the setting of the local oscillator source, is conducive to miniaturization of the equipment and reduces the cost of the equipment.

[0049] See also Figure 2 As shown, Figure 2 The structure diagram of the frequency conversion unit. The frequency conversion unit includes a first switch and a first frequency conversion processing channel, a second frequency conversion processing channel, a third frequency conversion processing channel, a fourth frequency conversion processing channel and a fifth frequency conversion processing channel connected to the first switch; the first frequency conversion processing channel includes a 0.38-2GHZ passband filter, an amplifier, a filter, a mixer, a filter and an amplifier connected in sequence, and the mixer is connected to a first local oscillator signal; the second frequency conversion processing channel includes a 2-6GHZ passband filter, an amplifier, a filter, a mixer, a filter and an amplifier connected in sequence, and the mixer is connected to a first local oscillator signal; the third frequency conversion processing channel includes a 6-18GHZ passband filter, an amplifier and a filter connected in sequence; the fourth frequency conversion processing channel includes a 18-30GHZ passband filter, an amplifier, a filter, a mixer, a filter and an amplifier connected in sequence, and the mixer is connected to a third local oscillator signal; the fifth frequency conversion processing channel includes a 30-40GHZ passband filter, an amplifier, a filter, a mixer, a filter and an amplifier connected in sequence, and the mixer is connected to a second local oscillator signal.

[0050] Specifically, the first switch receives a wide RF signal of 0.38-40 GHZ through an antenna, and the wide RF signal is divided into five paths by the first switch: 0.38 GHZ, 2-6 GHZ, 6-18 GHZ, 18-30 GHZ and 30-40 GHZ, and is frequency-converted through a first frequency conversion processing channel, a second frequency conversion processing channel, a third frequency conversion processing channel, a fourth frequency conversion processing channel and a fifth frequency conversion processing channel, respectively. The first frequency conversion processing channel includes a 0.38-2 GHZ passband filter, an amplifier, a filter, a mixer, a filter and an amplifier connected in sequence, and a 0.38 GHZ-2 GHZ signal is mixed with a 12 GHZ first local oscillator signal Q1 in a mixer to output a 12.38-14 GHZ signal. The second frequency conversion processing channel includes a 2-6 GHZ passband filter, an amplifier, a filter, a mixer, a filter and an amplifier connected in sequence, and a 2-6 GHZ signal is mixed with a 12 GHZ first local oscillator signal Q1 in a mixer to output a 14-18 GHZ signal. The third frequency conversion processing channel includes a 6-18GHZ passband filter, an amplifier and a filter connected in sequence, and directly outputs a 6-18GHZ signal without mixing. The fourth frequency conversion processing channel includes an 18-30GHZ passband filter, an amplifier, a filter, a mixer, a filter and an amplifier connected in sequence. The 18-30GHZ signal is mixed with the 36GHZ third local oscillator signal Q3 in the mixer to output a 6-18GHZ signal. The fifth frequency conversion processing channel includes a 30-40GHZ passband filter, an amplifier, a filter, a mixer, a filter and an amplifier connected in sequence. The 30-40GHZ signal is mixed with the 24GHZ second local oscillator signal Q2 in the mixer to output a 6-16GHZ signal. The 0.38-40GHZ RF signal is converted to 6-18GHZ by the frequency conversion processing unit for subsequent processing.

[0051] See also Figure 3 As shown, Figure 3 The harmonic processing unit is a schematic diagram of the structure. The harmonic processing unit includes a second switch and a first harmonic processing channel and a second harmonic processing channel connected to the second switch; the first harmonic processing channel includes a 6-10 GHZ bandpass filter, an amplifier and a filter connected in sequence; the second harmonic processing channel includes a 10-18 GHZ bandpass filter, an amplifier and a filter connected in sequence.

[0052] Specifically, the four outputs of the frequency conversion processing unit are divided into two by the second switch, one of which passes through a 6-10GHZ bandpass filter, an amplifier and a filter to output a 6-10GHZ signal; the other passes through a 10-18GHZ bandpass filter, an amplifier and a filter to output a 10-18GHZ signal.

[0053] See also Figure 4 As shown, Figure 4 Schematic diagram of the structure of the first frequency mixing unit. The first frequency mixing unit comprises a third switch, a digitally controlled attenuator and a mixer connected in sequence, and the mixer is connected to a fourth local oscillator signal.

[0054] Specifically, the two outputs of the harmonic processing unit are combined into one through the third switch, and connected to the mixer after digitally controlled attenuation. In the mixer, the 6-18 GHZ signal is mixed with the 32-40 GHZ fourth local oscillator signal Q4 to output a 27-28 GHZ signal and a 21.5-22.5 GHZ signal.

[0055] See also Figure 5 As shown, Figure 5 Schematic diagram of the structure of the intermediate frequency processing unit. The intermediate frequency processing unit includes a fourth switch and a 27 GHz passband filter and a 22 GHz passband filter connected to the fourth switch.

[0056] Specifically, the two outputs of the first frequency mixing unit enter the fourth switch and are divided into two paths, which are respectively filtered out of interference signals by a 27 GHz passband filter and a 22 GHz passband recorder.

[0057] See also Figure 6 As shown, Figure 6 : is a schematic diagram of the structure of the second frequency mixing unit. The second frequency mixing unit comprises a fifth switch and a mixer connected in sequence, and the mixer is connected to a fifth local oscillator signal.

[0058] Specifically, the two outputs of the intermediate frequency processing unit are combined into one through the fifth switch and input into the mixer. In the mixer, the 27 GHZ and 22 GHZ signals are mixed with the fifth local oscillator signal Q5 of 23.8 / 29.3 GHZ to output a 1.3-2.3 GHZ signal.

[0059] See also Figure 7 As shown, Figure 7 The intermediate frequency output unit is a schematic diagram of the structure of the intermediate frequency output unit. The intermediate frequency output unit includes a 1.8 GHz passband filter, an amplifier and a digitally controlled attenuator connected in sequence.

[0060] Specifically, the output of the second frequency mixing unit is output as a stable 1.8 GHZ signal via a 1.8 GHZ passband filter, an amplifier and a digitally controlled attenuator.

[0061] In a possible implementation, the local oscillator unit and the receiving processing unit are connected to the power supply via an electronic filter, and the electronic filter is used to increase the filtering effect.

[0062] The radio frequency acquisition preprocessing equipment provided by the present invention divides a 12 GHZ local oscillator source into local oscillator signals of 12 GHZ, 24 GHZ, 36 GHZ, 16-20 GHZ and 23.8 / 29.3 GHZ through a local oscillator unit, converts a 0.38-40 GHZ radio frequency signal into 6-18 GHZ for centralized processing through the local oscillator signals of 12 GHZ, 24 GHZ and 36 GHZ, performs two mixings through the local oscillator signals of 16-20 GHZ and 23.8 / 29.3 GHZ, and finally converts it into a stable 1.8 GHZ output.

[0063] The local oscillator signal of the device is provided by a local oscillator source, which simplifies the setting of the local oscillator source and reduces the manufacturing cost of the device. The device converts the 0.38-40GHZ RF signal to 6-18GHZ for centralized processing, realizes the sharing of processing channels, and improves the integration of the device.

[0064] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A radio frequency acquisition preprocessing device, characterized in that: including a shielding shell and electronic devices inside the shielding shell; The electronic device comprises a local oscillator unit and a receiving processing unit, wherein the local oscillator unit provides a local oscillator signal for the receiving processing unit; The receiving processing unit includes a frequency conversion processing unit, a harmonic processing unit, a first mixing unit, an intermediate frequency processing unit, a second mixing unit and an intermediate frequency output unit connected in sequence; The local oscillator unit is connected to the frequency conversion processing unit, the first frequency mixing unit and the second frequency mixing unit to provide a local oscillator signal; Wherein, the local oscillator unit includes a local oscillator source, a first power divider, a frequency doubler, a frequency tripler, a second power divider, a frequency hopping source, a point frequency source and a frequency multiplier, the local oscillator source is connected to the first power divider, the first power divider is respectively connected to the frequency doubler and the frequency tripler, the frequency tripler is connected to the second power divider, the second power divider is respectively connected to the frequency hopping source and the point frequency source, the frequency hopping source is connected to the frequency multiplier, the first power divider outputs a first local oscillator signal, the frequency doubler outputs a second local oscillator signal, the second power divider outputs a third local oscillator signal, the frequency multiplier outputs a fourth local oscillator signal, and the point frequency source outputs a fifth local oscillator signal; The first local oscillator signal, the second local oscillator signal and the third local oscillator signal are all connected to the frequency conversion processing unit, the fourth local oscillator signal is connected to the first frequency mixing unit, and the fifth local oscillator signal is connected to the second frequency mixing unit.

2. The radio frequency acquisition preprocessing device according to claim 1, characterized in that: The frequency conversion processing unit includes a first switch and a first frequency conversion processing channel, a second frequency conversion processing channel, a third frequency conversion processing channel, a fourth frequency conversion processing channel and a fifth frequency conversion processing channel connected to the first switch; The first frequency conversion processing channel includes a 0.38-2GHZ passband filter, an amplifier, a filter, a mixer, a filter and an amplifier connected in sequence, and the mixer is connected to a first local oscillator signal; The second frequency conversion processing channel includes a 2-6 GHZ passband filter, an amplifier, a filter, a mixer, a filter and an amplifier connected in sequence, and the mixer is connected to the first local oscillator signal; The third frequency conversion processing channel includes a 6-18 GHZ passband filter, an amplifier and a filter connected in sequence; The fourth frequency conversion processing channel includes an 18-30 GHZ passband filter, an amplifier, a filter, a mixer, a filter and an amplifier connected in sequence, and the mixer is connected to a third local oscillator signal; The fifth frequency conversion processing channel includes a 30-40 GHZ passband filter, an amplifier, a filter, a mixer, a filter and an amplifier connected in sequence, and the mixer is connected to the second local oscillator signal.

3. The radio frequency acquisition preprocessing device according to claim 1, characterized in that: The harmonic processing unit includes a second switch and a first harmonic processing channel and a second harmonic processing channel connected to the second switch; The first harmonic processing channel includes a 6-10 GHZ bandpass filter, an amplifier and a filter connected in sequence; The second harmonic processing channel includes a 10-18 GHZ bandpass filter, an amplifier and a filter connected in sequence.

4. The radio frequency acquisition preprocessing device according to claim 1, characterized in that: The first frequency mixing unit includes a third switch, a digitally controlled attenuator and a mixer which are connected in sequence, and the mixer is connected to a fourth local oscillator signal.

5. The radio frequency acquisition preprocessing device according to claim 1, characterized in that: The intermediate frequency processing unit includes a fourth switch and a 27 GHz passband filter and a 22 GHz passband filter connected to the fourth switch.

6. The radio frequency acquisition preprocessing device according to claim 1, characterized in that: The second frequency mixing unit includes a fifth switch and a mixer connected in sequence, and the mixer is connected to a fifth local oscillator signal.

7. The radio frequency acquisition preprocessing device according to claim 1, characterized in that: The intermediate frequency output unit includes a 1.8 GHZ passband filter, an amplifier and a digitally controlled attenuator which are connected in sequence.

8. The radio frequency acquisition preprocessing device according to claim 1, characterized in that: The local oscillator source is a 12 GHZ local oscillator source, the frequency hopping source is a 16-20 GHZ frequency hopping source, and the point frequency sources are 23.8 GHZ and 29.3 GHZ point frequency sources.

9. The radio frequency acquisition preprocessing device according to claim 1, characterized in that: The local oscillator unit and the receiving processing unit are connected to the power supply through an electronic filter.

10. The radio frequency acquisition preprocessing device according to claim 2, characterized in that: The first switch is used to access a 0.38-40 GHZ radio frequency source.

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