JPS5822140Y2 - Electromagnetic wave detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic wave detection device suitable for detecting external radiated electromagnetic waves, particularly non-modulated microwave signal sources.

Conventionally, this type of device consisted of the antenna, modulator, and detector as independent blocks, each of which was connected to a connector or waveguide flange, resulting in a large overall shape and weight. .

Particularly in the microwave band, an electromagnetic horn and a waveguide equipped with modulation diodes and detection diodes are integrated, which reduces the space factor and requires a three-dimensional configuration of the electromagnetic horn and waveguide. There were drawbacks such as inconvenience and inconvenience in handling.

In order to eliminate the above-mentioned drawbacks, the present invention constructs an antenna, a modulator, and a wave detector on a flat substrate, and mounts the entire device on a single substrate to make it small and lightweight.

This will be explained in detail with reference to the drawings. FIG. 1 is a plan view of an embodiment of the present invention, in which 1 is a strip line antenna, 2 is a detection diode, 3 is a DC cut capacitor, 4 is a variable impedance element such as a modulation diode, and 5 is a strip line antenna.
, 6.7 is a microwave choke element determined by a wavelength constant, 8 is an output terminal of a detection diode 2, and 9 is a terminal of a DC current return circuit detected by the detection diode 2, which is normally grounded.

10 is an input terminal for the modulation signal of the modulation diode 4; 11
is ground: 12 is aluminum wiring, 13 is a board.

In this case, the antenna 1, the DC cut capacitor 3, the choke elements 5, 6.7, the terminals 8, 9, 10, and the aluminum wiring 12 can be manufactured all at once by etching, printing, or other techniques.

A part of the aluminum wiring 12 is missing, and a diode 2.4 is inserted there and soldered to form a predetermined circuit.

FIG. 2 is an identical circuit to the embodiment of FIG. 1, and corresponding parts are designated by the same numbers.

Here, 14 is a detection circuit, and 15 is a modulation circuit.

To operate this, electromagnetic waves received from the antenna 1 are input to the detection circuit 14, detected by the detection diode 2, and the detected signal passes through the choke element 5 and is taken out as a signal from the terminal 8.

The choke element 6 constitutes a return circuit for the direct current detected by the detection diode 2, and acts as a microwave choke circuit.

Now, I will explain the function of the modulation diode 4. If there is no modulation diode, the signal taken out from the terminal 8 will be the one that directly detects the signal received from the antenna 1, so it will be the modulation signal of the existing electromagnetic wave. It should be possible to extract the envelope-detected signal.

However, since it is unknown what kind of modulation signal this is, even if the signal is to be amplified and extracted, it is unknown what band the amplifier should use, making it difficult to actually design the circuit.

Here, since this device is a device that detects whether or not electromagnetic waves are present, the received signal is modulated by the modulation diode 4.

The modulation signal applied to the modulation diode 4 is supplied via the terminal 10 of the modulation circuit 15 and the choke element T from a low frequency generation source (not shown).

The operating principle of this modulator is that the termination conditions of the detection diode 2 are changed by the modulation diode 4.

That is, the terminal end of the detection diode 2 is grounded via the DC cut capacitor 3 and the modulation diode 4.
5 ~ By pressing the button on this circuit and applying a modulation signal using a variable impedance element such as a switching diode or varactor diode as the modulation diode 4, the termination conditions change in synchronization with the modulation signal, and the detection rate of the detection diode 2 also changes. Change.

In the above configuration, no matter how the electromagnetic waves are modulated, the output signal from terminal 8 is always connected to terminal 1.
Since the same frequency component as the modulation signal applied from 0 is included, the amplifier connected to the terminal 8 only needs to amplify this frequency component and can be manufactured extremely easily.

With the above configuration, the main elements of electromagnetic wave detection, such as the antenna, detection diode, DC cut capacitor, modulation diode, and choke element, can be incorporated into one board, and most of the QS is also etched. , can be simultaneously produced using methods such as printing.

As explained above, since the electromagnetic wave detection device according to the present invention has its main parts constructed on a single substrate, it can be much smaller and lighter than a three-dimensional circuit configuration.

Moreover, since it is suitable for mass production, it has the advantage of stable quality and improved reliability, as well as reducing manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is a plan view of the main parts of the electromagnetic wave detection device according to the present invention, and FIG. 2 shows the same circuit as shown in FIG. 1... Antenna, 2... Detection diode, 3... DC cut capacitor, 4...
...Variable impedance element, 5.6.7...
...Choke element, 8゜9.10...Terminal, 1
3... Board, 14... Detection circuit, 15
...Modulation circuit.

Claims (1)

[Scope of utility model registration request] The receiving antenna 1 and the part 1 extending from one end of the receiving antenna 1 to the choke element 5 as an element of the detection circuit 14 and the detected signal output terminal 8 are electrically isolated from one end of the choke element 5 and are not provided. The choke element 6 and the terminal 9 of the DC current return circuit as elements of the adjacent detection circuit 14, the modulation signal input terminal 10 and the choke element 7 as elements of the modulation circuit 15, and one end of the choke element 6 and Both the DC cassette capacitor 3 interposed between one end of the choke element 7 and the ground terminal 11 which is electrically isolated from one end of the choke element 1 and is adjacent to the ground terminal 11 are connected to one plane. It is formed on a substrate by etching, printing, etc., and the detection diode 2 and modulation diode 4 are connected to the electrically isolated and missing parts in the detection circuit 14 and the modulation circuit 15, and electromagnetic waves are An electromagnetic wave detection device that outputs a signal having the same frequency as the applied modulation signal from the detection circuit 14 when a signal is input.