KR970007868B1 - Terminal of oscillator - Google Patents

Abstract

The multiple local oscillation access apparatuses using a band stop filter are directed to minimizing any interference between local oscillation units when accessing a plurality of local oscillation units used for a high frequency detection method using a band stop filter. This apparatus includes a broad band antenna(10) for receiving a X-band, a k-band and an Ka-band, a frequency mixer(11) for mixing a signal of the broad band antenna(1) and signals from a plurality of local oscillation units(13, 14 and 15), a lo band pass filter(12) for passing a certain band frequency, and a plurality of local oscillation units(13, 14 and 15) which each operate in a turned-on state, for thereby implementing an easier access and enhancing a performance of the product by minimizing any interference between the local oscillation units.

Description

Multiple Local Oscillator Connection Devices Using Bandstop Filter

1 is a circuit configuration diagram of a connection device according to the present invention, Table 1 is a frequency diagram appearing for each band in the present invention.

* Explanation of symbols for main parts of the drawings

10 wideband antenna 11: frequency mixer

12 low pass filter (LPF) 13, 14, 15: first to third local oscillator

131,141,151: Bandstop Filter (BSF)

132, 142, 152: semiconductor device 133, 143, 153: oscillation device

134,144,154 Dielectric Resonator 135,145,155 Resistance

The present invention relates to a plurality of local oscillator connection devices, in particular, to minimize the influence of interference between the local oscillators when connecting a plurality of local oscillators used in the microwave signal detection method using a band stop filter.

Conventionally, in connecting a plurality of local oscillators, a band pass filter and a local oscillator are considered.

In the former case, a bandpass filter is used at the output of the local oscillator to minimize the interference effect by matching at the oscillation frequency and having an open characteristic at other local oscillation frequencies.

In the latter case, the design of the local oscillator takes into account the matching of multiple connected local oscillators, rather than for matching each of the oscillators.

However, in the former case, the former has a problem in that the connection is not easy when there are three or more local oscillators due to the structure of the band pass filter. In the latter case, the oscillator is changed according to the characteristic change and external impedance of the semiconductor element used in the local oscillator. There was a problem in that the oscillation frequency and the output power were changed, and thus the interference caused by the local oscillation period was affected.

The present invention has been made to solve the above problems of the prior art, by using a band stop filter to minimize the interference effect between the local oscillator when connecting a plurality of local oscillators used in the ultra-high frequency signal detection method to improve the product performance and connection It is intended to facilitate the purpose.

DETAILED DESCRIPTION OF THE INVENTION The present invention for achieving the above object will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram of a connection apparatus according to the present invention, which is a broadband antenna 10 to which X, K, and KA band signals are input, and the broadband antenna 10 signal and a plurality of local oscillation units ( A frequency mixer 11 for mixing the signals of 13, 14, and 15 to generate an intermediate frequency, a low pass filter 12 for passing only a predetermined low frequency at the intermediate frequency, and having different predetermined oscillation frequencies Optionally, it is configured to include a plurality of local oscillation parts 13, 14, and 15 which are operated in an ON state only.

In addition, the plurality of local oscillators 13, 14, and 15 are respectively configured to suppress band pass filters 131, 141, and 151 for preventing the passage of a predetermined frequency, and output conditions of the dielectric resonators 134, 144, and 154 for performing LC resonance with the oscillation elements 133, 143, 153. The semiconductor devices 132, 142, and 152 that are switched on and off, and resistors 135, 145, and 155 for stabilizing the lines, respectively.

In addition, the first local oscillator 13 has an oscillation frequency of 11.5580 GHz, the second local oscillator 14 has an oscillation frequency of 16.6335 GHz, and the third local oscillator 15 has 17.2165 GHz.

When described with reference to Table 1 the operation and effect of the present invention configured as described above.

First, as shown in Table 1, each of the input frequencies for each of the X, K, and KA bands received by the wideband antenna 10 and the respective oscillation frequencies generated by the plurality of local oscillators 13, 14, and 15 are frequency mixers. Mixing through (11) gives an intermediate frequency as shown in Table 1.

TABLE 1

The oscillation frequency of the local oscillator 13, 14, 15 is the distance (L1, L2, L3) between the distance (G1, G2, G3) and the semiconductor elements (132, 142, 152) between the lines at the center of the dielectric resonator (134, 144, 154) 11.5580 GHz, 16.6335 GHz, and 17.2165 GHz are determined.

Here, using the 6.6335 GHz and 17.2165 GHz band stop filter 131 at the output terminal of the local oscillation unit 13 having an oscillation frequency of 11.5580 GHz, the reflection coefficient of the point B (S22, 1) is matched or low impedance at the oscillation frequency. And at 16.6335 GHz and 17.2165 GHz to be open or high impedance.

Similarly, using the 11.5580 GHz and 17.2165 GHz band-stop filters 141 at the output terminal of the second oscillation station 14 having an oscillation frequency of 16.6335 GHz, the reflection coefficient of point C (`` S22, 2) is matched or low impedance at the oscillation frequency. At 11.5580 GHz and 17.2165 GHz, open or high impedance is required.

In addition, at point D, 17.2165 GHz is matched or low impedance, and at 11.5580 GHz and 16.6335 GHz, it is either open or high impedance.

The local oscillators 13, 14, and 15 operated in this way are selectively turned on, so that when the first local oscillator 13, which is 11.5580 GHz, is operated, the second local oscillator 14 and 17.2165 GHz which are 16.6335 GHz are operated. 3 The local oscillation unit 15 is turned off.

Therefore, when connecting, adjust L5, which is the distance between A and C points, and L6, which is the distance between A and D points, so that the reflection coefficients (`` AC) and (`` AD) viewed from point A to point C and D are open impedance or high When the impedance is set to 11.5580 GHz, the power of the first local oscillation unit 13 does not leak from point A to point C and point D, and the oscillation frequency change due to the change of the output element and the output impedance of the off state is small. It is a safe state.

In addition, since there is no leakage power of the local oscillation unit, it is possible to transfer the maximum local oscillation power to the frequency mixer 11.

In this manner, the same effects can be obtained even when the second and third local oscillation units 14 and 15 of 16.6335 GHz and 17.2165 GHz are turned on.

As described above, the present invention can minimize the interference effect between the local oscillators when connecting a plurality of local oscillators used in the ultra-high frequency signal detection method using a band stop filter. The effect is to improve the performance of.

Claims (5)

A frequency mixer for generating an intermediate frequency by mixing the broadband antenna 10 to which the X-band, K-band, and KA band signals are input, and the signals of the broadband antenna 10 and the plurality of local oscillators 13, 14, and 15 ( 11), a low pass filter 12 which passes only a predetermined low frequency at the intermediate frequency, and a plurality of local oscillators 13, 14, and 15 each having a predetermined predetermined oscillation frequency and selectively operating only one on state. A plurality of local oscillator connection device using a band stop filter, characterized in that the configuration comprising a). The method of claim 1, wherein the plurality of local oscillators (13, 14, 15) are respectively the band-stop filter (131, 141, 151) to prevent the passage of a constant frequency, and the dielectric resonators (134, 144, 154) to perform LC resonance with the oscillation element (133, 143, 153) A plurality of local oscillator connection devices using a band-stop filter composed of semiconductor devices 132, 142 and 152 switched on and off according to the output state of the circuit and resistors 135, 145 and 155 for stabilizing the line. The multiple local oscillation connection apparatus according to claim 1 or 2, wherein the first local oscillator (13) has an oscillation frequency of 11.5580 GHz. The multiple local oscillation connection apparatus according to claim 1 or 2, wherein the second local oscillator (14) has an oscillation frequency of 16.66335 GHz. 3. A plurality of local oscillation connection apparatuses according to claim 1 or 2, wherein the third local oscillator (15) has an oscillation frequency of 17.2165 GHz.