JP4776657B2 - High-frequency transmission line, high-frequency transceiver using the same, and radar apparatus - Google Patents

Description

  The present invention relates to a high-frequency transmission line that is incorporated in an integrated circuit, a radar module, or the like and transmits a high-frequency signal, and a high-frequency transceiver using the same.

  The present invention also relates to a radar apparatus including the high-frequency transceiver and the radar apparatus.

  Conventionally, metal waveguides have been often used as high-frequency transmission lines for transmitting microwave and millimeter-wave high-frequency signals, but due to recent demands for miniaturization of high-frequency modules, dielectric lines are used as high-frequency signals. A high-frequency module used as a waveguide has been developed. Of these, non-radiative dielectric waveguides (hereinafter also referred to as NRD guides) that have low transmission loss of high-frequency signals have attracted attention.

  The basic configuration of this NRD guide is shown in a partially broken perspective view in FIG. As shown in the figure, a rectangular dielectric line 53 having a rectangular cross section is arranged between flat conductors 51 and 52 arranged in parallel with a predetermined interval a. If a ≦ λ / 2 with respect to the wavelength λ of the high-frequency signal, the noise intrusion from the outside to the dielectric line 53 is eliminated, and the high-frequency signal is not radiated to the outside. The signal can be propagated efficiently. The wavelength λ of the high frequency signal is a wavelength in the air (free space) at the operating frequency.

  On the other hand, in the field of microwave monolithic integrated circuits (MMICs), so-called TEM transmission lines such as microstrip lines and coplanar lines are frequently used as high-frequency transmission lines.

  In the high-frequency transmission line as described above, the line length of the high-frequency transmission line connected between the two connecting portions may be an odd multiple of one-fourth of the wavelength of the high-frequency signal to be transmitted. Widely known (see, for example, Patent Documents 1 to 5).

  Moreover, the example of the conventional high frequency transmitter / receiver is disclosed by patent document 6 and patent document 7, for example.

An example of a conventional radar device and a vehicle equipped with the radar device is disclosed in, for example, Patent Document 8.
Japanese Utility Model Publication No. 5-051305 Japanese Patent Laid-Open No. 5-063597 JP-A-9-139601 JP 2004-146919 A JP 2002-016405 A Japanese Patent Application Laid-Open No. 7-077756 JP 2000-258525 A JP 2003-035768 A

  However, in the conventional high-frequency transmission line as disclosed in Patent Documents 1 to 5, when a high-frequency signal is reflected at a connection portion with another high-frequency transmission line or the like, the high-frequency signal is actually reflected. As the line length is set as above so that the transmission characteristics are good under the premise that there is no such phase change, the input of the high-frequency transmission line The high-frequency signal reflected at the end and returned to the input side and the high-frequency signal reflected at the output end of the high-frequency transmission line and returned to the input side are combined with a shift from the opposite phase. Since the high-frequency signal returning to the input side cannot be sufficiently suppressed, there is a problem that the transmission characteristics of the high-frequency signal transmitted through the high-frequency transmission line cannot be made sufficiently good.

  In addition, in a conventional high-frequency transmitter / receiver using a high-frequency transmission line, the transmission characteristics of the high-frequency transmission line become unstable or the transmission loss increases. There is a problem that transmission and reception may not be performed stably due to instability.

  The present invention has been devised to solve the above-described problems in the prior art that are desired to be improved. The object of the present invention is to sufficiently suppress the high-frequency signal reflected at the connecting portion. An object of the present invention is to provide a high-frequency transmission line with improved transmission characteristics.

  Another object of the present invention is to provide a high-performance high-frequency transmitter / receiver capable of stably transmitting and operating a transmission output and a local signal used therein, and a radar apparatus including the high-performance high-frequency transmitter / receiver. Is to provide.

In the high-frequency transmission line of the present invention, the first, second, and third dielectric lines are arranged between the flat conductors arranged in parallel at intervals of half or less of the wavelength of the high-frequency signal, and the first The third dielectric line is connected and arranged with an interval between the first and second dielectric lines. The first, second, and third dielectric lines have a characteristic impedance set to one predetermined value, and the third dielectric line includes the first dielectric line and a first connection portion. Connected through. Then, the wavelength of the high frequency signal propagating through the third transmission line lambda, when n is a natural number, the line length of the third dielectric waveguide (2n-1) when set to lambda / 4 (provided that Let n be a natural number, and the wavelength of the high frequency signal propagating through the third transmission line lambda), among the pre-Symbol first dielectric waveguide of a high-frequency signal to be incident on the input end of the third dielectric waveguide , the distance between the apparent and the input end and the reflection point of the signal leaking to the reflected by the input end first dielectric waveguide L _1, before SL output end side of the third dielectric waveguide the apparent distance of between the output end and the reflection point of the signal leaking to the reflected and the first dielectric waveguide as a L2, the line length of the third dielectric waveguide (2n-1) lambda / 4- (L1 + L2) is set again.

The high frequency transmission line of the present invention having the above structure, the first, second and third dielectric waveguide have different heights, both the metal sheet is interposed between the flat conductor The metal sheet is in contact with each other, and at least one of the metal sheets is deeper than the other.

  A first high-frequency transmitter / receiver according to the present invention includes a high-frequency oscillator that generates a high-frequency signal, and a high-frequency oscillator for transmission that is connected to the high-frequency oscillator through a first high-frequency transmission line and is transmitted to one output terminal. A branching device that outputs as a signal and outputs as a local signal at the other output end, and has a first terminal, a second terminal, and a third terminal around the magnetic body, and is input from one terminal in this order. A circulator in which the first terminal is connected to the one output terminal of the branching device by a second high-frequency transmission line, and the second terminal of the circulator outputs the high-frequency signal from a next adjacent terminal. A transmitting / receiving antenna connected by a third high-frequency transmission line, and the other high-frequency transmission line connected between the other output end of the branching device and the third terminal of the circulator. of A mixer that mixes the local signal output to the power end with the high-frequency signal received by the transmission / reception antenna and outputs an intermediate-frequency signal; and at least one of the first to fourth high-frequency transmission lines One is a high-frequency transmission line according to the first or second aspect of the present invention having the above-described configuration.

  A second high-frequency transmitter / receiver of the present invention includes a high-frequency oscillator that generates a high-frequency signal, and the high-frequency oscillator connected to the high-frequency oscillator by a first high-frequency transmission line and branching the high-frequency signal to one output terminal. A branching device that outputs as a signal and outputs as a local signal to the other output end, and an input end connected to the one output end of the branching device by a second high-frequency transmission line, the transmission end on the output end side An isolator for outputting a high-frequency signal; a transmission antenna for transmitting the transmission high-frequency signal connected to the output end of the isolator by a third high-frequency transmission line; and a second antenna on the other output end side of the branching device. 4 is output to the other output terminal connected by a fifth high-frequency transmission line between the reception antenna connected by the high-frequency transmission line 4 and the other output terminal of the branching device. B A mixer that mixes a Cull signal and a high-frequency signal received by the receiving antenna and outputs an intermediate-frequency signal, and at least one of the first to fifth high-frequency transmission lines is a book having the above-described configuration. It is a high-frequency transmission line according to any one of the first and second aspects of the invention.

  Further, the radar apparatus of the present invention processes either the first or second high frequency transmitter / receiver of the present invention and the distance information to the detection object by processing the intermediate frequency signal output from the high frequency transmitter / receiver. And a distance information detector for detecting.

  According to the high-frequency transmission line of the present invention, the first, second, and third dielectric lines are arranged between the flat conductors arranged in parallel at intervals of half or less of the wavelength of the high-frequency signal. The third dielectric line is connected with a space between the first and second dielectric lines, and the third dielectric line has a line length that is the first dielectric line. Of the high-frequency signal input from the dielectric line to the input end of the third dielectric line, it is reflected at the connection part on the input end side of the third dielectric line and is reflected on the first dielectric line. A part of the high frequency signal leaking is reflected by Wa and the connection part on the output end side of the third dielectric line, and the other part of the high frequency signal leaking to the first dielectric line is the same as Wa. Wb, where δ is the phase difference at the center frequency between Wa and Wb, δ = ± π Since the phase difference δ between Wa and Wb is δ = ± π, the phase advance of the high-frequency signal changes when the high-frequency signal is reflected at the connection portion. Because the two partial high-frequency signals leaking into the first dielectric line can be surely exactly opposite in phase with each other so that they can effectively cancel each other. The high-frequency transmission line can improve the transmission characteristics of the high-frequency signal transmitted through the third dielectric line to the second dielectric line. In addition, even if a high-frequency transmission line is configured by connecting a plurality of dielectric lines, the transmission characteristics at the connection portion can be improved, so that each dielectric line has a relatively simple shape. Therefore, there is an effect that the dielectric line is less likely to be broken due to stress or the like at the time of manufacture, and it becomes easy to cope with a design change.

  According to the high-frequency transmission line of the present invention, at least one of the first, second, and third dielectric lines is deeper than the other in the metal sheet interposed between the flat conductors. When the height of each of the first, second, and third dielectric lines varies during manufacture, the metal sheet absorbs the variation and the first, second, and third dielectric lines Since the first and second dielectric lines can be prevented from radiating from any of the first, second, and third dielectric lines, the first dielectric line can be surely secured. Thus, a high-frequency transmission line can be obtained that can improve the transmission characteristics of the high-frequency signal transmitted through the third dielectric line from the first to the second dielectric line.

  According to the first high-frequency transceiver of the present invention, the high-frequency oscillator that generates a high-frequency signal and the high-frequency signal connected to the high-frequency oscillator by the first high-frequency transmission line are branched and sent to one output terminal. A branching device that outputs as a trusted high-frequency signal and outputs as a local signal at the other output end, and has a first terminal, a second terminal, and a third terminal around the magnetic body, and in this order from one terminal A circulator in which the first terminal is connected to the one output end of the branching device by a second high-frequency transmission line, which outputs the input high-frequency signal from the next adjacent terminal, and the second of the circulator A transmission / reception antenna connected to the terminal of the second high-frequency transmission line, and a fourth high-frequency transmission line connected between the other output end of the branching device and the third terminal of the circulator, Above A mixer that mixes the local signal output to the output terminal and the high-frequency signal received by the transmission / reception antenna to output an intermediate-frequency signal, and includes the first to fourth high-frequency transmission lines. Since at least one of the first and second high-frequency transmission lines of the present invention having the above-described configuration is used, the transmission characteristics of the high-frequency transmission line are stable, and the transmission output and local signals used internally are used. Therefore, it becomes a high-performance high-frequency transceiver that transmits a good high-frequency signal that is easy to identify on the receiving side.

  According to the second high frequency transmitter / receiver of the present invention, a high frequency oscillator for generating a high frequency signal and the high frequency signal connected to the high frequency oscillator by a first high frequency transmission line are branched and sent to one output terminal. A branching device that outputs as a trusted high-frequency signal and outputs as a local signal to the other output end, and an input end connected to the one output end of the branching device by a second high-frequency transmission line, the output end side An isolator for outputting a high frequency signal for transmission; a transmission antenna for transmitting the high frequency signal for transmission connected to the output end of the isolator by a third high frequency transmission line; and the other output end side of the branching device A receiving antenna connected by a fourth high-frequency transmission line and an output to the other output end connected by a fifth high-frequency transmission line between the receiving antenna and the other output end of the branching device. The A mixer that mixes the local signal and the high-frequency signal received by the receiving antenna and outputs an intermediate frequency signal, and at least one of the first to fifth high-frequency transmission lines has the above-described configuration. Since it is either the first or second high-frequency transmission line of the present invention, the transmission characteristics of the high-frequency transmission line are stable even in a high-frequency transceiver using a separate antenna for transmission and reception, Since the local signal used internally becomes stable, it becomes a high-performance high-frequency transmitter / receiver that transmits a good high-frequency signal that is easy to identify on the receiving side.

  According to the radar apparatus of the present invention, either the first or second high-frequency transmitter / receiver of the present invention, and the distance information to the detection object by processing the intermediate frequency signal output from the high-frequency transmitter / receiver. Since the high-frequency transmitter / receiver transmits a good high-frequency signal that is easy to identify on the receiving side, it can detect the detection object quickly and reliably, The radar apparatus can reliably detect a far object to be detected.

  A high-frequency transmission line according to the present invention, a high-frequency transmitter / receiver using the transmission line, and a radar apparatus including the high-frequency transmitter / receiver will be described in detail below.

  First, a high-frequency transmission line and first and second high-frequency transceivers according to the present invention will be described in detail below with reference to the drawings.

  FIG. 1 is a schematic diagram showing an example of an embodiment of a high-frequency transmission line as a reference example for explaining the high-frequency transmission line of the present invention, where (a) is a block circuit diagram, and (b) is a block circuit diagram. It is sectional drawing. FIG. 2 is a perspective view schematically showing an example of an embodiment of a high-frequency transmission line according to the present invention. FIGS. 3A and 3B are sectional views schematically showing another example of the high-frequency transmission line according to the present invention. FIGS. 4 and 5 are a schematic block circuit diagram and a plan view, respectively, showing an example of an embodiment of the first high-frequency transceiver of the present invention. FIGS. 6 and 7 are a schematic block circuit diagram and a plan view, respectively, showing an example of an embodiment of the second high-frequency transceiver according to the present invention. 8 and 9 are block circuit diagrams schematically showing other examples of the first and second high-frequency transceivers according to the present invention, respectively. FIG. 10 is a block circuit diagram schematically showing an example of an embodiment of a radar apparatus according to the present invention.

  In FIG. 1, 1, 2 and 3 are microstrip lines as first, second and third transmission lines, respectively, 4 is a dielectric substrate, and 4a and 4b are formed on the lower and upper surfaces of the dielectric substrate 4, respectively. The strip conductor layers 4c, which are constituent elements of the microstrip lines 1 and 2, are formed on the dielectric substrate 4, and the through conductors connecting the strip conductor layers 4a and 4b are provided. Reference numeral 5 denotes a microwave monolithic integrated circuit (MMIC). ) Substrate, 5a is a strip conductor layer, which is a component of the microstrip line 3, formed on the MMIC substrate 5, and 6 is a wire bond connecting the strip conductor layers 4b, 5a.

  In FIGS. 2 and 3, 7 and 8 are flat conductors, 9 is a dielectric line, and 9a, 9b and 9c are first, second and third dielectric lines, respectively. 7a and 8a are adhesive layers, and 8b is a metal sheet.

  4 to 10, 11 is a high-frequency oscillator, 12 is a branching device, 13 is a modulator, 14 is a circulator, 15 is a transmission / reception antenna, 16 is a mixer, 17 is a switch, 18 is an isolator, 18a and 18b are respectively The input and output ends of the isolator 18, 19 is a transmission antenna, 20 is a reception antenna, 21 and 31 are flat conductors, 22 and 32 are first dielectric lines, 23 and 33 are second dielectric lines, 24 and 34 is a third dielectric line, 25 and 35 are fourth dielectric lines, 36 is a fifth dielectric line, 27 and 37 are ferrite plates as magnetic bodies, and 14a, 27a and 37a are first terminals. , 14b, 27b, and 37b are second terminals, 14c, 27c, and 37c are third terminals, and 24a, 35a, and 36a are non-reflection terminators. 5 and 7, the upper flat conductor is not shown.

  An example of the embodiment of the high-frequency transmission line of the reference example shown in FIG. 1 is the third transmission via the connection portions 1a and 2a between the microstrip lines 1 and 2 as the first and second transmission lines. A microstrip line 3 as a line is connected, and the microstrip line 3 has a line length D of the microstrip line 3 among the high-frequency signals input from the microstrip line 1 to the input end 3 a of the microstrip line 3. A part of the high-frequency signal that is reflected by the connection portion 1a on the input end 3a side and leaks to the microstrip line 1 is reflected by Wa, and the connection portion 2a on the output end 3b side of the third transmission line 3 is reflected by the same as Wa When a part of other high-frequency signals leaking to the microstrip line 1 is Wb and the phase difference at the center frequency between these Wa and Wb is δ, δ = ± π. A structure in which the sea urchin set.

  More specifically, the microstrip lines 1 and 3 are, for example, strip conductor layers on the upper and lower surfaces of a dielectric substrate 4 which is a printed board such as FR-4 as shown in a cross-sectional view in FIG. 4a and 4b are formed, and the strip conductor layers 4a and 4b are connected by a through conductor 4c such as a through-hole conductor. The microstrip line 2 is formed by forming a strip conductor layer 5a on an MMIC substrate 5 made of, for example, gallium arsenide (GaAs). Further, the end portions of the strip conductor layer 4b and the strip conductor layer 5a are connected by wire bonds. Further, the width of the strip conductor layers 4a, 4b, 5a, the thickness of the dielectric substrate 4, and the thickness of the MMIC substrate 5 are set so that the characteristic impedance becomes a predetermined value such as 50Ω.

In the microstrip line 3, the line length D of the strip conductor layer 4b is reflected by the connection part 1a and leaks to the strip conductor layer 4a, and reflected by the connection part 2a and leaks to the strip conductor layer 4a. The phase difference δ from the high-frequency signal Wb to be set is set to δ = ± π. In order to set the phase difference δ in this way, for example, the intensity of the high-frequency signal output from the microstrip line 1 by combining Wa and Wb varies according to A · sin δ (A is a proportional coefficient). since it takes a maximum value when the [delta] = ± [pi, by changing the line length D of the strip conductor layer 4b, to measure the reflection characteristic S ₁₁ of the high-frequency signal input from the microstrip line 1 for some of its After plotting the measured values on a diagram with the interval D on the horizontal axis and S ₁₁ on the vertical axis, a sine curve is fitted on the plot, and the phase difference δ is δ = A line length D that is ± π may be set. Incidentally, line length D is may be set from the minimum value of the measured value by measuring the transmission characteristic S ₂₁ of the high-frequency signal to be transmitted between the microstrip line 2.

In general, the line length D is D = (2n−1) λ / 4 (where n is a natural number and λ is the wavelength of a high-frequency signal propagating through the microstrip line 3). Actually, it is known that when a high-frequency signal is reflected by the connecting portions 1a and 2a, the phase of the high-frequency signal is advanced or delayed, so that the reflection point appears to be a microstrip. from both ends in a connecting portion 1a and the connecting portion 2a of the line 3, the deviated by L ₁ and L _2, respectively, and the high-frequency signal Wa leaking to the strip conductor layer 4a is reflected by the connecting portion 1a, the connection portion 2a The high-frequency signal Wb that is reflected and leaks to the strip conductor layer 4a is usually not in antiphase, and cannot be attenuated sufficiently even if they are combined. In order to make the high-frequency signal Wa reflected from the connecting portion 1a and leaking to the strip conductor layer 4a and the high-frequency signal Wb reflecting from the connecting portion 2a and leaking to the strip conductor layer 4a to have exactly the opposite phase, the line length D Thus, D = (2n−1) λ / 4− (L, corrected by L ₁ and L ₂ respectively, which are the length from the connecting portion 1a and the length from the connecting portion 2a, which are both ends of the microstrip line 3. ₁ + L ₂ ), but in order to do so, the line length D is set so that the phase difference δ of these high-frequency signals is δ = ± π as described above. A high-frequency signal Wa that is reflected by the portion 1a and leaks to the strip conductor layer 4a (microstrip line 1), and a high-frequency signal Wb that is reflected by the connection portion 2a and leaks to the strip conductor layer 4a (microstrip line 1) is exactly the same. Reverse Can be in phase.

  In this example, the microstrip line is exemplified as the first, second, and third transmission lines. However, the first, second, and third transmission lines are a strip line, a coplanar line, and a coplanar line with a ground. It can also be applied to other transmission lines such as slot lines, coaxial lines, waveguides, and dielectric waveguides. In addition, the first, second and third transmission lines may be different types or different sizes of transmission lines, and the characteristic impedance of the connection portion between the different types or different sizes of transmission lines may be different. A discontinuous part is formed. Such a discontinuous portion can also be regarded as a “connecting portion” in the present invention.

  According to the high-frequency transmission line of the reference example shown in FIG. 1, since the phase difference δ between Wa and Wb is δ = ± π, the phase of the high-frequency signal is reflected when the high-frequency signal is reflected at the connecting portions 1a and 2a. Even if the way of travel changes, the two partial high-frequency signals leaking to the microstrip line 1 as the first transmission line are sure to be in exactly opposite phase with each other and effectively cancel each other. Therefore, the transmission of the high-frequency signal transmitted from the microstrip line 1 as the first transmission line to the microstrip line 2 as the second transmission line through the microstrip line 3 as the third transmission line is possible. The characteristics can be improved.

  FIG. 2 is a perspective view schematically showing an example of an embodiment of a high-frequency transmission line according to the present invention. FIGS. 3A and 3B are sectional views schematically showing another example of the high-frequency transmission line according to the present invention. FIGS. 4 and 5 are a schematic block circuit diagram and a plan view, respectively, showing an example of an embodiment of the first high-frequency transceiver of the present invention. FIGS. 6 and 7 are a schematic block circuit diagram and a plan view, respectively, showing an example of an embodiment of the second high-frequency transceiver according to the present invention. 8 and 9 are block circuit diagrams schematically showing other examples of the first and second high-frequency transceivers according to the present invention, respectively. FIG. 10 is a block circuit diagram schematically showing an example of an embodiment of a radar apparatus according to the present invention.

  2 and 3, 7 and 8 are flat conductors, 9 is a dielectric line, and 9a, 9b and 9c are first, second and third dielectric lines, respectively. 7a and 8a are adhesive layers, and 8b is a metal sheet.

  4 to 10, 11 is a high-frequency oscillator, 12 is a branching device, 13 is a modulator, 14 is a circulator, 15 is a transmission / reception antenna, 16 is a mixer, 17 is a switch, 18 is an isolator, 18a and 18b are respectively The input and output ends of the isolator 18, 19 is a transmission antenna, 20 is a reception antenna, 21 and 31 are flat conductors, 22 and 32 are first dielectric lines, 23 and 33 are second dielectric lines, 24 and 34 is a third dielectric line, 25 and 35 are fourth dielectric lines, 36 is a fifth dielectric line, 27 and 37 are ferrite plates as magnetic bodies, and 14a, 27a and 37a are first terminals. , 14b, 27b, and 37b are second terminals, 14c, 27c, and 37c are third terminals, and 24a, 35a, and 36a are non-reflection terminators. 5 and 7, the upper flat conductor is not shown.

  An example of the embodiment of the high-frequency transmission line of the present invention shown in FIG. 2 is the first, second and second between the flat conductors 7 and 8 arranged in parallel at intervals of 1/2 or less of the wavelength of the high-frequency signal. Third dielectric lines 9a, 9b, and 9c are arranged, and third dielectric line 9c is connected with a distance L between first and second dielectric lines 9a and 9b. The third dielectric line 9c has the line length La of the high-frequency signal input from the first dielectric line 9a to the input end 9c1 of the third dielectric line 9c, and the input of the third dielectric line 9c. A part of the high-frequency signal that is reflected by the connection portion 9a1 on the end 9c1 side and leaks to the first dielectric line 9a is reflected by Wa, and the connection portion 9b1 on the output end 9c2 side of the third dielectric line 9c is reflected by Wa. Similarly, Wb is a part of the other high-frequency signal leaking to the first dielectric line 9a. When the phase difference was set to [delta] at the center frequency of the Luo Wa and Wb, a configuration that is set so that δ = ± π. Needless to say, the high-frequency transmission line of the present invention shown in FIG. 2 constitutes a nonradiative dielectric line (NRD guide).

In the above configuration, the first, second and third dielectric lines correspond to the first, second and third transmission lines in the example shown in FIG. 1, and the high frequency of the reference example shown in FIG. Similar to the transmission line, the third dielectric line 9c has the line length La reflected by the connection part 9a1 and leaked to the first dielectric line 9a and the connection part 9b1. The phase difference δ from the high frequency signal Wb leaking to the first dielectric line 9a is set to be δ = ± π. In order to set the phase difference δ in this way, for example, the intensity of the high-frequency signal output from the first dielectric line 9a by combining Wa and Wb is A · sin δ (A is a proportional coefficient). Since the maximum value is obtained when δ = ± π, the line length La of the third dielectric line 9c is changed, and some of the high-frequency signals input from the first dielectric line 9a are changed. the reflection characteristic S ₁₁ was measured, after the measured value horizontal axis distance D, the vertical axis is plotted on the diagram is S _11, the sinusoidal model is fitted on this plot, the fitting curve is maximum Therefore, the line length La may be set so that the phase difference δ is δ = ± π. Incidentally, the line length La is may be set from the minimum value of the measured value the first and second dielectric waveguides 9a, the transmission characteristic S ₂₁ of the high-frequency signal to be transmitted between 9b and measured.

  According to the high-frequency transmission line of the present invention shown in FIG. 2, since it has the above-described configuration, it has the same effect as the high-frequency transmission line of the reference example shown in FIG. That is, since the phase difference δ between Wa and Wb is δ = ± π, the phase advance of the high-frequency signal changes when the high-frequency signal is reflected at the connecting portions 9a1 and 9b1, but the first Since the two partial high-frequency signals leaking into the dielectric line 9a can be reliably made to have opposite phases with each other and effectively cancel each other, the first dielectric line 9a to the second The transmission characteristics of the high-frequency signal transmitted through the third dielectric line 9c to the second dielectric line 9b can be improved.

  In the non-radiative dielectric line (NRD guide), it is known that the first, second and third dielectric lines 9a, 9b and 9c are integrally formed. If the dielectric line is divided and configured like a transmission line, the divided individual dielectric lines should have a relatively simple shape even for a complicatedly shaped dielectric line such as a bend. Therefore, the dielectric lines are less likely to be destroyed by stress during manufacturing, and individual dielectric lines with a simple shape have a high degree of design freedom. There is an advantage that it becomes easy to cope with the design change by the combination. Further, even if a high-frequency transmission line is configured by connecting a plurality of dielectric lines, the transmission characteristics at the connection portion can be improved.

  Next, another example of the embodiment of the high-frequency transmission line of the present invention shown in FIG. 3 is that the first, second and third dielectric lines 9a, 9b, 9c At least one of the metal sheets 8b interposed between the conductors 7 and 8 is deeper than the other (in this example, the third dielectric line 9c is deeper than the first dielectric line 9a. It is a configuration. In FIG. 3, the second dielectric line 9b is not shown. The dielectric line 9 indicates first, second and third dielectric lines 9a, 9b and 9c.

  In the above configuration, the metal sheet 8b is made of a metal that is a good conductor, and this good conductor is uniformly adhered to any one of the upper surfaces of the first, second, and third dielectric lines 9a, 9b, and 9c. This makes it possible to make the line structure uniform in the transmission direction while the flat conductor 8 is electrically in close contact with the first, second and third dielectric lines 9a, 9b, 9c. It works to suppress the coupling to the mode. At this time, at least one of the first, second, and third dielectric lines 9a, 9b, and 9c is recessed deeper than the other into the metal sheet 8b interposed between the flat conductors 7 and 8. From the above, even if the height of each of the first, second and third dielectric lines 9a, 9b and 9c varies during manufacturing, the higher one is deeply sunk into the metal sheet 8b. The upper surfaces of the first, second, and third dielectric lines 9a, 9b, and 9c can be uniformly adhered to the metal sheet 8b. For this reason, if coupling to another mode other than the desired transmission mode is suppressed, the high-frequency signal transmitted to the first, second, and third dielectric lines 9a, 9b, 9c Transmission characteristics can be stabilized, and transmission loss can be reduced.

  In the example shown in FIG. 3, as a preferable configuration, an adhesive layer 7a is interposed between the lower flat conductor 7 and the lower surface of the dielectric line 9 (the first layer in FIG. 3B). In addition, an adhesive layer 8a is interposed between the upper flat conductor 8 and the metal sheet 8b. Since the adhesive layer 8a is interposed, the adhesive layer 8a also becomes a layer that is deformed when the dielectric line 9 is pressed together with the metal sheet 8b, and the dielectric line 9 is turned deeper into the metal sheet 8b. Thus, the dielectric line 9 can be more securely fitted into the metal sheet 8b and brought into close contact with each other. Further, as a preferable configuration of the high-frequency transmission line of the present invention, when the adhesive layer 7a is used between the flat conductor 7 and the dielectric line 9 in which the metal sheet 8b is not interposed, On the other hand, even if a horizontal force is applied to the contact surface between the flat conductor 7 and the dielectric line 9, it can be firmly fixed so that the fixing position of the dielectric line 9 does not change.

  According to the high-frequency transmission line of the present invention shown in FIG. 3, since it has the above configuration, it has the same function and effect as the example shown in FIG. 2, and the first, second, and third dielectrics. Even if the height of each of the body lines 9a, 9b, 9c varies during manufacture, the metal sheet 8b absorbs the variation and each of the first, second, and third dielectric lines 9a, 9b, 9c. Since the high-frequency signal can be prevented from being radiated from any of the first, second and third dielectric lines 9a, 9b, 9c. The transmission characteristics of the high-frequency signal transmitted from the dielectric line 9a to the second dielectric line 9b through the third dielectric line 9c can be improved.

  Next, each component of the high-frequency transmission line of the present invention will be described in more detail. In the high-frequency transmission line of the present invention, the metal sheet 8b may be a thin metal sheet, a thinly rolled metal foil, or a metal tape. The material of the metal sheet 8b is copper, aluminum (Al), iron (Fe), silver (Ag), gold (Au), platinum (Pt), SUS (stainless steel), brass (Cu-Zn alloy), etc. Use it. Among them, aluminum (Al), gold (Au), platinum (Pt), and brass (Cu—Zn alloy) have a moderate softness and are easy to sink the dielectric line 9, and thereafter the dielectric line. 9 is preferable because it is easy to reliably hold 9. If the metal sheet 8b made of these materials is used, the dielectric line 9 can be squeezed into the metal sheet 8b so as to be securely adhered and held.

  In the metal sheet 8b, a sticky layer as the adhesive layer 8a is formed in advance on the surface on the flat conductor 8 side (the surface on the flat conductor 7 side in the case of arranging on the flat conductor 7 side). Also good. In this way, when the metal sheet 8b is to be attached only to a specific region of the flat conductor 7 or the flat conductor 8, if the metal sheet 8b on which the adhesive layer 8a is formed in advance is patterned in a desired shape. It is convenient because the metal sheet 8b and the adhesive layer 8a can be processed at a time.

  The material of the adhesive layer 8a is an acrylic resin that is sticky (for example, the average molecular weight of an acrylic polymer component, glass transition temperature, carboxyl The heat resistance may be improved by optimizing the group content and the hydroxyl group content), or an acrylic resin, epoxy resin or silicon resin adhesive may be used. The thickness of the adhesive layer 8a is preferably about 50 μm for a millimeter wave signal, for example. If the adhesive material layer 8a is too thick, the surface of the metal sheet 8b will be wavy, resulting in vertical asymmetry in the non-radiative dielectric line structure, and the high frequency signal will be in a mode other than the desired transmission mode. When the adhesive layer 8a is too thin, the effect of increasing the depth of the dielectric line 9 tends to be insufficient.

  As the material of the adhesive layer 7a interposed between the flat conductor 7 and the dielectric line 9, an adhesive of acrylic resin, epoxy resin or silicon resin may be used. For the adhesive layer 7a, solder or metal brazing material may be used instead of the resin adhesive.

  Further, the metal sheet 8b may be directly attached to the flat conductor 7 or the flat conductor 8 by pressure bonding or fusion without passing through the adhesive layer 8a. In this case, the vertical symmetry of the non-radiative dielectric line structure is better than when the adhesive layer 8a is used, and the high-frequency signal is less likely to be coupled to a mode other than the desired transmission mode. The metal sheet 8b may be temporarily fixed to the flat conductor 7 or the flat conductor 8 during adjustment and then fixed as described above.

The material of the dielectric line 9 is a resin such as tetrafluoroethylene and polystyrene, or cordierite (2MgO · 2Al ₂ O ₃ · 5SiO ₂ ) ceramics, alumina (Al ₂ O ₃ ) ceramics, glass having a low relative dielectric constant. Ceramics such as ceramics are preferable, and these have low loss in the millimeter wave band.

  In addition, the cross-sectional shape of the dielectric line 9 is basically a rectangular shape, but may be a shape with rounded corners of the rectangular shape, and various cross-sectional shapes used for high-frequency signal transmission are used. can do.

  The flat conductors 7 and 8 are made of copper, aluminum, iron (Fe), silver (Ag), gold (Au), platinum (Pt), SUS (stainless steel) in terms of high electrical conductivity and good workability. ), A conductive plate made of a metal such as brass (Cu—Zn alloy) is suitable. Or what formed the conductor layer which consists of these metals on the surface of the insulating board which consists of ceramics, resin, etc. may be used.

  The first and second high-frequency transmission lines of the present invention can be suitably used for transmitting millimeter-wave band high-frequency signals, but the frequency of the high-frequency signals is lower than that, for example. Even in the microwave band, it can be used effectively.

  Next, the first and second high-frequency transceivers of the present invention will be described in detail with reference to the drawings.

  An example of the first high-frequency transmitter / receiver of the present invention shown in the block circuit diagram and the plan view in FIG. 4 and FIG. 5, respectively, is a high-frequency oscillator 11 that generates a high-frequency signal, and the high-frequency oscillator 11 includes a first A branching device 12 connected by a high-frequency transmission line, branching out the high-frequency signal and outputting it as a transmission high-frequency signal RF to one output end 12b, and outputting it as a local signal LO to the other output end 12c; A first terminal 27a, a second terminal 27b, and a third terminal 27c around the ferrite plate 27, and a high-frequency signal input from one terminal in this order is output from the next adjacent terminal. A circulator 14 having a first terminal 14a connected to one output end 12b of the vessel 12 by a second high-frequency transmission line, and a second terminal 14b of the circulator 14; The other output connected by the fourth high-frequency transmission line between the transmission / reception antenna 15 connected by the third high-frequency transmission line and the other output terminal 12c of the branching device 12 and the third terminal 14c of the circulator 14 A mixer 16 that mixes a local signal LO output to the end 12c and a high-frequency signal received by the transmission / reception antenna 15 and outputs an intermediate frequency signal is provided, and the first to fourth components that connect the respective components are connected. At least one of the high-frequency transmission lines is a configuration that is one of the first and second high-frequency transmission lines of the present invention (in this example, the example shown in FIG. 3).

  With this configuration, a high-frequency transceiver corresponding to an FMCW radar device can be obtained. The high-frequency transmission line of the present invention shown in FIG. 3 includes a first dielectric line 22 that is the first high-frequency transmission line in FIG. 5, a second dielectric line 23 that is the second high-frequency transmission line, The present invention is applied to a third dielectric line 24 that is a third high-frequency transmission line and a fourth dielectric line 25 that is a fourth high-frequency transmission line. Note that the first terminal 14a, the second terminal 14b, and the third terminal 14c shown in FIG. 4 correspond to the first terminal 27a, the second terminal 27b, and the third terminal 27c, respectively, in FIG. ing. Further, in FIG. 5, the branching device 12 is configured where the first dielectric line 22 and the third dielectric line 24 are brought close to each other so as to be electromagnetically coupled. A non-reflection terminator 24 a is connected to the end of the third dielectric line 24 on the high frequency oscillator 11 side. In FIG. 5, reference numeral 21 denotes a lower flat conductor, which corresponds to the flat conductor 7 in FIG.

  In addition, as shown in the block circuit diagram similar to FIG. 4 in FIG. 8, the above configuration is connected between one output end 12 b of the branching device 12 and the first terminal 14 a of the circulator 14. An FM pulse type radar apparatus including a modulator 13 that modulates a high-frequency signal output from one output terminal 12b of the branching device 12 and outputs the modulated high-frequency signal to the first terminal 14a of the circulator 14 as a transmission high-frequency signal RF. It is good also as a high frequency transmitter-receiver corresponding to.

  According to an example of the first high-frequency transmitter / receiver of the present invention shown in the block circuit diagram and the plan view in FIGS. 4 and 5, respectively, the first to fourth high-frequency transmissions are configured as described above. The transmission characteristics of the line are stable, and the transmission output and the local signal used internally are stable, so that a high-performance signal that transmits a good high-frequency signal that is easy to identify on the receiving side is obtained.

  In addition, the other example of embodiment of the 1st high frequency transmitter / receiver of this invention shown in FIG. 8 has the same effect. In the example shown in FIG. 8, the signal is output from one output end 12 b of the branching device 12 connected by a high-frequency transmission line between one output end 12 b of the branching device 12 and the first terminal 14 a of the circulator 14. A modulator 13 is provided that modulates the high-frequency signal and outputs it as a transmission high-frequency signal to the first terminal 14a of the circulator 14. In this case, frequency modulation (FM modulation) of the transmission high-frequency signal RF is further pulse-modulated by the modulator 13, so that when the high-frequency transmitter / receiver is used as a radar device, detection is performed compared to the case of only FM modulation. Since the distance to the target portion and the speed of the detection target object can be obtained uniquely and accurately, there is an advantage that, for example, even if there are a plurality of detection target objects, each of them can be easily detected.

  Next, an example of the second high-frequency transmitter / receiver of the present invention shown in the block circuit diagram and the plan view in FIGS. 6 and 7, respectively, is a high-frequency oscillator 11 that generates a high-frequency signal, and the high-frequency oscillator 11 includes A branching device 12 for branching a high-frequency signal connected by a first high-frequency transmission line, outputting the high-frequency signal RF for transmission to one output end 12b, and outputting the local signal LO to the other output end 12c; An isolator 18 that outputs a transmission high-frequency signal RF to the output end 18 b side, and an output end 18 b of the isolator 18 are connected to one output end 12 b of the branching device 12 by the second high-frequency transmission line. A transmission antenna 19 for transmitting a transmission high-frequency signal RF connected by a third high-frequency transmission line, and a fourth high-frequency transmission on the other output end 12c side of the branching device 12 A reception antenna 20 connected by a path, and a local signal LO output to the other output end 12c connected by a fifth high-frequency transmission line between the reception antenna 20 and the other output end 12c of the branching device 12. And a mixer 16 that mixes the high-frequency signal received by the receiving antenna 20 and outputs an intermediate-frequency signal, and at least one of the first to fifth high-frequency transmission lines connecting the components is provided. This is a configuration that is one of the first and second high-frequency transmission lines of the present invention (in this example, the example shown in FIG. 3).

  With this configuration, a high-frequency transceiver corresponding to an FMCW radar device can be obtained. Note that the high-frequency transmission line of the present invention shown in FIG. 3 includes a first dielectric line 32 that is a first high-frequency transmission line, a second dielectric line 33 that is a second high-frequency transmission line in FIG. The present invention is applied to a third dielectric line 34 that is a third high-frequency transmission line, a fourth dielectric line 35 that is a fourth high-frequency transmission line, and a fifth dielectric line 36 that is a fifth high-frequency transmission line. ing. In FIG. 7, the branching device 12 is configured such that the first dielectric line 32 and the fourth dielectric line 35 are brought close to each other so as to be electromagnetically coupled. Further, the isolator 18 has a first terminal 37a, a second terminal 37b, and a third terminal 37c around a ferrite plate 37 as a magnetic body, and the high-frequency signals input from one terminal in this order are adjacent to each other. The other end of the fifth dielectric line 36 having one end connected to the non-reflection terminator 36a is connected to the third terminal 37c of the circulator that outputs from the next terminal. The first terminal 37a and the second terminal 37b correspond to the input end 18a and the output end 18b of the isolator 18, respectively. A non-reflection terminator 35 a is connected to the end of the fourth dielectric line 35 on the high frequency oscillator 11 side. In FIG. 7, reference numeral 31 denotes a lower flat conductor, which corresponds to the flat conductor 7 in FIG.

  9 is connected to one output end 12b of the branching device 12 and the input end 18a of the isolator 18 by a high-frequency transmission line as shown in a block circuit diagram similar to FIG. The FM pulse type radar apparatus includes a modulator 13 that modulates a high-frequency signal output from one output end 12b of the branching device 12 and outputs the modulated high-frequency signal to the input end 18a of the isolator 18 as a transmission high-frequency signal RF. It is good also as a high frequency transmitter-receiver corresponding to.

  According to the second embodiment of the second high frequency transmitter / receiver of the present invention shown in the block circuit diagram and the plan view in FIG. 6 and FIG. 7, respectively, because of the above configuration, the high frequency using the separate antenna for transmitting and receiving Also in the transmitter / receiver, the transmission characteristics of the high-frequency transmission line are stable, and the transmission output and the local signal used internally are stable. Become.

  In addition, the other example of embodiment of the 2nd high frequency transmitter / receiver of this invention shown in FIG. 9 has the same effect. In the example shown in FIG. 9, a high frequency signal output from one output end 12b of the branching device 12 connected between one output end 12b of the branching device 12 and the input end 18a of the isolator 18 is modulated. It is assumed that a modulator 13 that outputs to the input end 18a of the isolator 18 as a transmission high-frequency signal RF is provided. In this case, frequency modulation (FM modulation) of the transmission high-frequency signal RF is further pulse-modulated by the modulator 13, so that when the high-frequency transmitter / receiver is used as a radar device, detection is performed compared to the case of only FM modulation. Since the distance to the target portion and the speed of the detection target object can be obtained uniquely and accurately, there is an advantage that, for example, even if there are a plurality of detection target objects, each of them can be easily detected.

  In the first and second high-frequency transceivers of the present invention, as shown in FIGS. 4 and 6, a semiconductor integrated circuit element such as a CMOS that cuts off the intermediate frequency signal at an appropriate timing is provided at the output end of the mixer 16. A switch 17 comprising: In this case, the mixer output that contains noise and does not need to be received is cut off, so that the reception performance can be improved.

  Next, a radar apparatus according to the present invention, a vehicle equipped with the radar apparatus and a small ship equipped with the radar apparatus will be described.

  The radar apparatus of the present invention shown in a block circuit diagram in FIG. 10 includes either the first or second (first in this example) high-frequency transmitter / receiver of the present invention and the intermediate signal output from the high-frequency transmitter / receiver. It is the structure provided with the distance information detector 100 which processes the frequency signal and detects the distance information to a detection target object. Since the radar apparatus of the present invention has such a configuration, the transmission / reception performance of the high-frequency transmitter / receiver is high and stable, so that it is difficult to cause false detection, and the detection target can be detected quickly and reliably. At the same time, the radar apparatus can detect a far object to be detected.

  Such a radar apparatus of the present invention is mounted on a vehicle or a small ship, detects other vehicles, small ships, or obstacles as detection objects, and avoids a collision with them. Can be used. If the radar apparatus of the present invention is used for such a purpose, the radar apparatus is less prone to erroneous detection, and other vehicles, small ships or obstacles can be detected quickly and reliably. Collision with them can be safely avoided without causing rapid behavior. In addition, because the transmission output of the high-frequency signal used for detection is stable, the transmission output can be increased within a range that does not exceed the predetermined maximum output, so the frequency used by the radar device while detecting stably It is possible to make it difficult to cause a communication failure or the like with respect to other communication in the vicinity using a frequency close to the.

  Vehicles that can be used with the radar device of the present invention are vehicles such as trains, trains, automobiles, vehicles for transporting passengers and cargo, bicycles, motorbikes, amusement park vehicles, golf courses, etc. There are carts. Further, as a small vessel that can be used with the radar device of the present invention mounted, a rowing boat that can be operated without a license or a license of a small vessel and has a total tonnage of less than 20 tons. , Dinghy, water motorcycle, small bass boat with outboard motor, inflatable boat (inflatable boat) with outboard motor, fishing boat, recreational fishing boat, work boat, houseboat, towing boat, sports boat, fishing boat, yacht, ocean yacht, There are cruisers or pleasure boats with a gross tonnage of 20 tons or more.

  Thus, according to the present invention, it is possible to provide a high-frequency transmission line with improved high-frequency signal transmission characteristics by sufficiently suppressing high-frequency signals that are multiple-reflected between the connecting portions at both ends.

  In addition, it is possible to provide a high-performance high-frequency transmitter / receiver that can stably transmit and operate a transmission output and a local signal used internally. Can be provided.

  It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. For example, in the present invention, the connection portions 1a and 2a may be bend portions of the transmission line, proximity portions to other transmission lines, and the like. In this case, the gist of the present invention is applied by grasping a local characteristic impedance change at a bent portion of the transmission line or a portion close to another transmission line as a lumped constant such as a capacitance at the connecting portions 1a and 2a. As a result, the line length can be set appropriately even if there is a local characteristic impedance change in the bent part of the transmission line or in the vicinity of other transmission lines, etc. Will be able to.

(A) And (b) is the typical block circuit diagram and sectional drawing which show an example of embodiment of the transmission line for high frequency of a reference example, respectively. It is a typical perspective view showing an example of an embodiment of a transmission line for high frequency of the present invention. (A) And (b) is typical sectional drawing which shows the other example of embodiment of the transmission line for high frequencies of this invention. It is a typical block circuit diagram which shows an example of embodiment of the 1st high frequency transmitter-receiver of this invention. It is a typical top view of the high frequency transmitter-receiver shown in FIG. It is a typical block circuit diagram which shows an example of embodiment of the 2nd high frequency transmitter-receiver of this invention. It is a typical top view of the high frequency transmitter-receiver shown in FIG. It is a typical block circuit diagram which shows the other example of embodiment of the 1st high frequency transmitter-receiver of this invention. It is a typical block circuit diagram which shows the other example of embodiment of the 2nd high frequency transmitter-receiver of this invention. It is a typical block circuit diagram which shows an example of embodiment of the radar apparatus of this invention. It is a typical fragmentary perspective view which shows the basic composition of a nonradiative dielectric track | line.

Explanation of symbols

1: First transmission line (first microstrip line)
1a: Connection unit 2: Second transmission line (second microstrip line)
2a: Connection 3: Third transmission line (third microstrip line)
3a: Input end 3b: Output end 4: Dielectric substrate 4a, 4b: Strip conductor layer 5: Microwave monolithic integrated circuit (MMIC) substrate 5a: Strip conductor layer 6: Wire bond 7, 8: Flat conductor 7a, 8a: Adhesive Layer 8b: Metal Sheet 9: Dielectric Line 9a: First Dielectric Line 9b: Second Dielectric Line 9c: Third Dielectric Line 9a1: Connection Portion 9b1: Connection Portion 9c1: Input End 9c2: Output 11: High-frequency oscillator 12: Branch 12a: Input 12b: One output 12c: The other output 13: Modulator 14: Circulator 14a: First terminal 14b: Second terminal 14c: Third Terminal 15: Transmission / reception antenna 16: Mixer 17: Switch 18: Isolator 18a: Input end 18b: Output end 19: Transmission antenna 20: Reception antenna 1,31: flat conductor (bottom)
22, 32: First dielectric line 23, 33: Second dielectric line 24, 34: Third dielectric line 24a: Non-reflective terminator 25, 35: Fourth dielectric line 35a: Non-reflective Terminator 36: Fifth dielectric line 36a: Non-reflective terminator 27, 37: Ferrite plate

Claims (5)

The first, second and third dielectric lines are spaced between the first and second dielectric lines between the flat conductors arranged in parallel at an interval of half or less of the wavelength of the high frequency signal. And the third dielectric line is connected and arranged,
The first, second and third dielectric lines have a characteristic impedance set to one predetermined value,
The third dielectric line is connected to the first dielectric line via a first connection ;
The line length of this third dielectric waveguide (2n-1) λ / 4 when set to the (n is a natural number, the lambda is the wavelength of a high frequency signal propagating through the third dielectric waveguide ) Reflection of a high-frequency signal incident on the input end of the third dielectric line from the first dielectric line and reflected on the input end side and leaked to the first dielectric line interval L ₁ of the apparent point and said input _end, a front Symbol third dielectric said output end and the reflection point of the signal leaking reflected by the first dielectric waveguide at the output end of the line the spacing apparent as the _{L 2,} the third the line length of the dielectric waveguide (2n-1) λ / 4- (L1 + L2) to the resetting again, the high-frequency transmission line. The first, second, and third dielectric lines have different heights, and both are in contact with a metal sheet interposed between the flat conductors, and at least one of the metal sheets is more than the others. deeply sunk is in claim 1 for high frequency transmission line according. A high-frequency oscillator that generates a high-frequency signal, and the high-frequency signal connected to the high-frequency oscillator by a first high-frequency transmission line is branched and output as a high-frequency signal for transmission to one output terminal, and locally to the other output terminal A branching device that outputs as a signal and a first terminal, a second terminal, and a third terminal around the magnetic material, and a high-frequency signal input from one terminal in this order is output from an adjacent next terminal A circulator in which the first terminal is connected to the one output terminal of the branching device via a second high-frequency transmission line; and a third high-frequency transmission line connected to the second terminal of the circulator. The local signal output to the other output terminal, connected by a fourth high-frequency transmission line, between the transmission / reception antenna, the other output terminal of the branching device, and the third terminal of the circulator. And at least one of the first to fourth high-frequency transmission lines is a mixer that mixes the high-frequency signal received by the transmission / reception antenna and outputs an intermediate-frequency signal. A high-frequency transmitter-receiver , which is the high-frequency transmission line described in 1. A high-frequency oscillator that generates a high-frequency signal, and the high-frequency signal connected to the high-frequency oscillator by a first high-frequency transmission line is branched and output as a high-frequency signal for transmission to one output terminal, and locally to the other output terminal A branching device that outputs as a signal, an isolator that has an input end connected to the one output end of the branching device via a second high-frequency transmission line, and that outputs the transmission high-frequency signal to the output end side; A transmission antenna that transmits the high-frequency signal for transmission connected to the output end by a third high-frequency transmission line, and a reception antenna that is connected to the other output end side of the branching device by a fourth high-frequency transmission line And a local signal output to the other output end connected by a fifth high-frequency transmission line between the receiving antenna and the other output end of the splitter. A high-frequency transmission according to claim 1 or 2, wherein at least one of the first to fifth high-frequency transmission lines is mixed with a high-frequency signal mixed to output an intermediate frequency signal. A high-frequency transceiver that is a track. Comprising a high frequency transceiver of claim 3 or claim 4, wherein the distance information detector for detecting the distance information to detect the object by processing the intermediate frequency signal output from the RF transceiver, radar apparatus.

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