JPS59178003A - Reflection type frequency converter - Google Patents

Abstract

PURPOSE:To attain stable frequency converting operation by inputting an intermediate frequency signal via a low-pass filter and connecting an open type terminator to its input terminal. CONSTITUTION:A high frequency signal in requency f0 inputted from a carrier signal input terminal In is inputted to a varactor diode D via a circulator and an impedance converting element 10. On the other hand a signal in frequency f1 inputted from an IF signal input terminal IF.In is inputted to the diode D via the low-pass filter LPF consisting of a microstrip circuit. Then, a modulation wave signal having frequencies of f0+ or -f1 generated by mixing the two input signals is extracted from a modulation wave output terminal Out via the converting element 10 and the circulator again.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a reflective layered wave number converter, and in particular to a reflective layered wave number converter that mixes a carrier wave signal of a cylindrical frequency and a predetermined intermediate If44 frequency (IF") signal, and modulates the signal. The present invention relates to Pfr request upconvergence for obtaining a wireless transmission signal.

(2) Prior Art and Problems FIG. 1 shows the configuration of a conventional general reflective layer wave number converter. Here, a high frequency signal with a frequency mantissa fo inputted from a carrier signal input terminal In is passed through a circulator and a bandpass filter BPF whose passband is set to a predetermined high frequency band, and then passed through a varactor diode D. is input. On the other hand, the signal of frequency f input from the IF signal input terminal IF・In is passed through the bandpass filter B P
It is input to the varactor diode D via F2. (fo±f+
), the modulated wave signal having a frequency of
F, , V - Modulated wave output terminal (T) u via curator
It is extracted from t. Thereafter, only the predetermined transmitted signal is passed through a narrowband bandpass filter (not shown).

If an attempt is made to form the circuit shown in FIG. 1 using a MIC circuit, it is difficult to manufacture a good bandpass filter using a micro strip or a pulley, so the configuration shown in FIG. 2 will be used.

In the second M+, C is a DC component blocking capacitor, 1° is an impedance conversion element, and LPF is a low-pass straightening filter formed by a microstrip circuit. That is, the first
The BPF of pin 1 is converted to B? by the impedance conversion element 10.
F2 is realized by a filter LPF.

Here, ■P゛IM input terminal IP/In must be separated from diode D in terms of high frequency, so filter L
However, since the termination conditions of this filter LPF are generally considered only within the IF multiplied signal band, the filter LPF seen from the diode D1j
The side impedance was not necessarily good.

Therefore, in the above-mentioned conventional frequency converter, if the input conditions at the F signal input terminal are changed, the surrounding conditions of the diode change, the conversion efficiency fluctuates, or (if the circuit causes oscillation due to f) The problem I mentioned is wrong.

(3) Purpose of the Invention The present invention has been developed in view of the problems of the prior art described above, and an object of the present invention is to provide a frequency converter capable of stable operation. (4) Structure of the invention as described above. The purpose of the present invention is to mix one transmission word inputted through a circulator with a predetermined intermediate frequency signal,
The intermediate frequency signal is inputted via a low-pass filter, and the intermediate frequency signal input to the low-pass filter is also input using the same circulator to output the modulated wave as a modulated wave. By connecting an oven-type termination to the terminal, the termination condition in the high frequency band of the low-pass filter is also improved and achieved.

(5) Embodiments of the Invention Hereinafter, an example of ATv according to the present invention will be explained with reference to the drawings.

FIG. 3 shows an embodiment of the present invention, in which reference numeral 11 is an open terminator (dummy), and other components are the same as in FIG. 2.

Here, in order to improve the termination conditions of the filter LPF, an open type dummy 11 (which can be replaced at some point) is connected to the IF signal input terminal of the filter LPF'. The termination condition in the same wave number band is also set so that 4 is added to 4. Also, the F-fold signal is passed through this open type Gummy-11 cutout to the filter L-1)F.
input to the diode and drive the diode.

Normally, as the 1F signal, one-tenth to several hundredths of the modulated wave signal frequency is used, so even if the open type dummy 11 is attached, It only has the same effect as a small buceptance.

In addition, in this set, by supplying and inputting a DC bias to the IF"-18-, it is possible to maintain its operation even more stably.

FIG. 4 shows an undiscovered embodiment of the present invention, in which a choke coil is shown in the figure, and a variable resistor is VR, which constitutes a DC bias input circuit.

Here, it is necessary to select a value for the DC bias that will keep the modulated wave output stable. Figure 5 shows the relationship between the diode drive current and the modulated wave output. Conversion efficiency decreases.On the other hand, in reverse bias mode, although high conversion efficiency can be obtained, @1 output is not stable.In addition, the output characteristics due to the diode drive of the upper modulated wave are as follows. , it varies slightly depending on the selection of the diode itself, the conditions of the torsion circuit, etc.

Therefore, although we sacrifice conversion efficiency to some extent, we place emphasis on operational stability and achieve 1ΔA/! Superimpose the forward low bias shown by 1 and do a cool auto! It is also preferred to drive the circuit in two layers.

((・) Embodiments of the Invention As described above, according to the present invention, the f-bandance characteristic of the filter LPF that is oscillated from the diode D side is made as good as 1 in the high frequency band, and stable frequency conversion operation is achieved. In addition, it is possible to relax the IF multiplier signal input conditions, making it easier to manufacture the circuit.

[Brief explanation of the drawing]

Figure 1 shows the basic configuration of a conventional reflection-forming wavenumber converter.
Figure 3 shows a conventional reflection-forming wave number converter realized with an MIC circuit, Figure 3 shows one of the two series of the present invention, Figure 4 shows another embodiment of the present invention, and Figure 5 shows a diode. The relationship between drive current and modulated wave output is shown respectively. In the figure, BPF, BPF2 are band pass filters, D is a varactor diode, C is a capacitor for DC power failure, and 10 is an impedance conversion system. , LPF is a low-pass filter, r1+-x oven no; so terminator, L is a choke coil, vR is variable [(1) + no. Kaya 1 Figure 1) 1 θ〃 o Homare 2I21 n 19

Claims (1)

[Claims] 1. In a reflection type layered wave number converter that mixes a compressed wave transmission signal inputted through a circulator with a predetermined intermediate frequency signal and outputs it as a modulated wave again through the same circulator. , the input of the intermediate frequency signal is passed through the low frequency range 3jjFl
14
A reflection type frequency conversion ticket characterized in that an open type terminator is connected to four intermediate frequency quadrature signal inputs of a type filter. 2. The scope of claims characterized in that the mixing of the r-reflection signal and the intermediate frequency signal is performed using a diode, and the input of the intermediate frequency signal is superimposed on the white direction bias voltage. - The reflective layer wave number converter described in item H1.