Novel suspended strip line broadband high-power switch

Abstract

The utility model relates to a novel suspended strip line broadband high-power switch, which comprises an upper cavity, a lower cavity and a dielectric substrate fixed on the lower cavity through a positioning pin, and a bottom air cavity is formed between the dielectric substrate and the lower cavity; a circuit board is arranged on the dielectric substrate, the circuit board comprises a driver, two output ends of the driver are respectively connected with a PIN diode assembly through choke hollow coils, the two PIN diode assemblies are connected with each other, each PIN diode assembly is connected with a grounded choke hollow coil, and an input end of the driver is connected with a TTL (transistor-transistor logic). According to the utility model, the advantages of low loss and excellent standing wave of the suspended microstrip transmission line in radio frequency signal transmission are ingeniously combined, the defects of overlarge insertion loss, poor standing wave characteristic and the like of the existing microstrip transmission line are overcome, and compared with the traditional microstrip line series-parallel switch, the size is small, the working frequency range is wide, the insertion loss is small, and the standing wave characteristic is excellent.

Description

Technical Field

[0001] The utility model relates to the field of radio frequency circuits, in particular to a novel suspended strip line broadband high-power switch. Background Art

[0002] With the widespread application of radio aviation communications, satellite communications, and radar systems in the C-band, the degradation of system performance caused by the large insertion loss of microstrip transmission line switches has become particularly prominent. Currently, broadband high-power switches are mainly implemented by using microstrip lines + series-parallel high-power PIN transistors on ceramic dielectric substrates with good heat dissipation performance. The disadvantages of this method are poor standing wave, large losses, large debugging requirements, and difficult to control losses in the high-frequency band. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a novel suspended strip line broadband high-power switch, which solves the deficiencies of the prior art.

[0004] The purpose of the utility model is achieved through the following technical solutions: a novel suspended strip line broadband high-power switch, which includes an upper cavity, a lower cavity and a dielectric substrate fixed to the lower cavity by positioning pins, and a bottom air cavity is formed between the dielectric substrate and the lower cavity;

[0005] A circuit board is provided on the dielectric substrate. The circuit board includes a driver. The two output ends of the driver are respectively connected to a PIN diode assembly through a choke air-core coil. The two PIN diode assemblies are connected to each other. Each PIN diode assembly is connected to a grounded choke air-core coil. The input end of the driver is connected to TTL.

[0006] One PIN diode assembly includes PIN diodes D1 and D2, and the other PIN diode assembly includes PIN diodes D3 and D4; the anode of the PIN diode D1 is connected to the anode of the PIN diode D2, and the anode of the PIN diode D3 is connected to the anode of the PIN diode D4; the cathode of the PIN diode D1 is connected to the cathode of the PIN diode D3, the cathode of the PIN diode D2 is connected in parallel to the grounded choke air-core coil L4 and the series chip capacitor C2, and the cathode of the PIN diode D4 is connected in parallel to the grounded choke air-core coil L7 and the series chip capacitor C3.

[0007] The cathodes of the PIN diode D1 and the PIN diode D3 are also connected in parallel to the grounded choke air-core coil L1 and the series chip capacitor C1.

[0008] The positive poles of the PIN diode D1 and the PIN diode D2 are connected to one end of the choke air-core coil L2, the other end of the choke air-core coil L2 is connected to the choke air-core coil L3 and the grounded high-voltage filter capacitor C4, and the other end of the choke air-core coil L3 is connected to the driver and the grounded high-voltage filter capacitor C5.

[0009] The positive electrodes of the PIN diode D3 and the PIN diode D4 are connected to one end of the choke air-core coil L5, the other end of the choke air-core coil L5 is connected to the choke air-core coil L6 and the grounded high-voltage filter capacitor C7, and the other end of the choke air-core coil L6 is connected to the driver and the grounded high-voltage filter capacitor C6.

[0010] The chip capacitor C2, PIN diode D2, PIN diode D1, PIN diode D3, PIN diode D4 and chip capacitor C3 are connected via a suspended microstrip transmission line, and the PIN diode D1 and chip capacitor C1 are also connected via a suspended microstrip transmission line.

[0011] The other end of the choke air-core coil L5 is connected to the choke air-core coil L6 and the grounded high-voltage filter capacitor C7 through a control device connection line, and the other end of the choke air-core coil L6 is connected to the driver and the grounded high-voltage filter capacitor C6 through a control device connection line.

[0012] This utility model has the following advantages: a novel suspended stripline broadband high-power switch cleverly combines the low loss and excellent standing wave characteristics of suspended microstrip transmission lines in RF signal transmission, overcoming the shortcomings of existing microstrip transmission lines, such as excessive insertion loss and poor standing wave characteristics. Compared with traditional microstrip series-parallel switches, it has a smaller size, a wider operating frequency range, low insertion loss, and excellent standing wave characteristics. It improves port standing wave and loss, and has a wide frequency bandwidth, making it widely applicable to high-peak, low-duty-cycle pulse amplifier output switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 This is a schematic diagram of the circuit principle of the utility model;

[0015] In the figure: 1-upper cavity, 2-lower cavity, 3-dielectric substrate, 4-bottom air cavity, 5-positioning pin. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present application provided below in conjunction with the drawings is not intended to limit the scope of protection of the present application for which protection is sought, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. The present utility model is further described below in conjunction with the drawings.

[0017] like Figure 1 As shown, the utility model specifically relates to a novel suspended stripline broadband high-power switch, which includes an upper cavity 1, a lower cavity 2, and a dielectric substrate 3 fixed to the lower cavity 2 by a positioning pin 5, and a bottom air cavity 4 is formed between the dielectric substrate 3 and the lower cavity 2;

[0018] A circuit board is provided on the dielectric substrate 3. The circuit board includes a driver. The two output ends of the driver are respectively connected to a PIN diode assembly through a choke air-core coil. The two PIN diode assemblies are connected to each other. Each PIN diode assembly is connected to a grounded choke air-core coil. The input end of the driver is connected to TTL.

[0019] Furthermore, if Figure 2 As shown, one PIN diode assembly includes PIN diodes D1 and D2, and the other PIN diode assembly includes PIN diodes D3 and D4; the anode of the PIN diode D1 is connected to the anode of the PIN diode D2, and the anode of the PIN diode D3 is connected to the anode of the PIN diode D4; the cathode of the PIN diode D1 is connected to the cathode of the PIN diode D3, the cathode of the PIN diode D2 is connected in parallel to the grounded choke air-core coil L4 and the series chip capacitor C2, and the cathode of the PIN diode D4 is connected in parallel to the grounded choke air-core coil L7 and the series chip capacitor C3.

[0020] The cathodes of the PIN diode D1 and the PIN diode D3 are also connected in parallel to the grounded choke air-core coil L1 and the series chip capacitor C1.

[0021] The positive electrodes of the PIN diode D1 and the PIN diode D2 are connected to one end of the choke air-core coil L2, the other end of the choke air-core coil L2 is connected to the choke air-core coil L3 and the grounded high-voltage filter capacitor C4, and the other end of the choke air-core coil L3 is connected to the driver and the grounded high-voltage filter capacitor C5.

[0022] The positive electrodes of the PIN diode D3 and the PIN diode D4 are connected to one end of the choke air-core coil L5, the other end of the choke air-core coil L5 is connected to the choke air-core coil L6 and the grounded high-voltage filter capacitor C7, and the other end of the choke air-core coil L6 is connected to the driver and the grounded high-voltage filter capacitor C6.

[0023] Furthermore, chip capacitor C2, PIN diode D2, PIN diode D1, PIN diode D3, PIN diode D4, and chip capacitor C3 are connected via a suspended microstrip transmission line, and PIN diode D1 and chip capacitor C1 are also connected via a suspended microstrip transmission line. The other end of choke coil L5 is connected to choke coil L6 and grounded high-voltage filter capacitor C7 via a control device connection line. The other end of choke coil L6 is connected to the driver and grounded high-voltage filter capacitor C6 via a control device connection line.

[0024] Furthermore, the dielectric substrate 3 has a length of 12 mm, a width of 16.5 mm, and a height of 0.63 mm; the bottom air cavity 4 has a groove depth of 0.7 mm and a groove width of 1.1 mm;

[0025] The dielectric substrate 3 is made of beryllium oxide (BeO), with a dielectric constant of 6.8 and a thickness of 0.635 mm. The loss tangent of the dielectric substrate 3 is less than 0.0004. Microstrip transmission lines and control device connection lines are printed on the top layer of the dielectric substrate. PIN diodes and chip capacitors are eutectic-sintered to the top layer of the dielectric substrate at a 380° angle using gold-tin. The high-power PIN diodes and chip capacitors are connected to the microstrip transmission lines using two 100μ gold ribbons and figure-eight bonding. The choke air-core coil and high-voltage filter capacitor are soldered with lead-tin at a 220° angle. After all components on the dielectric substrate are assembled, they are sintered to the cavity using low-temperature tin at a 180° angle. Locating pins on the cavity ensure that the dielectric plate is sintered without deviation. The cavity is a double-sided cavity with a PIN diode driver on the back side. The driver output bias voltage is connected to the RF dielectric plate using DC glass beads.

[0026] The TTL controls the PIN diode driver, applying a positive bias voltage of 5V / 100mA or a negative bias voltage of -40V / 10mA to the PIN diode through the choke air-core coil. When the positive bias voltage is applied, a group of PIN diodes are forward-biased, and then a loop is formed with the grounded choke coil, and the RF signal on this path is turned on. When the negative bias voltage is applied, a group of PIN diodes are reverse-biased, and the RF signal on this path is cut off, thus realizing the function of selecting one of the two RF signals.

[0027] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention may be used in various other combinations, modifications, and improvements, and may be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant fields. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention shall be within the scope of protection of the appended claims.

Claims

1. A novel suspended stripline broadband high-power switch, characterized by: It comprises an upper cavity (1), a lower cavity (2), and a dielectric substrate (3) fixed to the lower cavity (2) via a positioning pin (5), and a bottom air cavity (4) is formed between the dielectric substrate (3) and the lower cavity (2); A circuit board is provided on the dielectric substrate (3), the circuit board comprising a driver, two output ends of the driver are respectively connected to a PIN diode component via a choke air-core coil, the two PIN diode components are connected to each other, each PIN diode component is connected to a grounded choke air-core coil, and the input end of the driver is connected to TTL.

2. The novel suspended stripline broadband high-power switch according to claim 1, characterized in that: One PIN diode assembly includes PIN diodes D1 and D2, and the other PIN diode assembly includes PIN diodes D3 and D4; the anode of the PIN diode D1 is connected to the anode of the PIN diode D2, and the anode of the PIN diode D3 is connected to the anode of the PIN diode D4; the cathode of the PIN diode D1 is connected to the cathode of the PIN diode D3, the cathode of the PIN diode D2 is connected in parallel to the grounded choke air-core coil L4 and the series chip capacitor C2, and the cathode of the PIN diode D4 is connected in parallel to the grounded choke air-core coil L7 and the series chip capacitor C3.

3. The novel suspended stripline broadband high-power switch according to claim 2, characterized in that: The cathodes of the PIN diode D1 and the PIN diode D3 are also connected in parallel to the grounded choke air-core coil L1 and the series chip capacitor C1.

4. The novel suspended stripline broadband high-power switch according to claim 2, characterized in that: The positive poles of the PIN diode D1 and the PIN diode D2 are connected to one end of the choke air-core coil L2, the other end of the choke air-core coil L2 is connected to the choke air-core coil L3 and the grounded high-voltage filter capacitor C4, and the other end of the choke air-core coil L3 is connected to the driver and the grounded high-voltage filter capacitor C5.

5. The novel suspended stripline broadband high-power switch according to claim 2, characterized in that: The positive electrodes of the PIN diode D3 and the PIN diode D4 are connected to one end of the choke air-core coil L5, the other end of the choke air-core coil L5 is connected to the choke air-core coil L6 and the grounded high-voltage filter capacitor C7, and the other end of the choke air-core coil L6 is connected to the driver and the grounded high-voltage filter capacitor C6.

6. The novel suspended stripline broadband high-power switch according to claim 2, characterized in that: The chip capacitor C2, PIN diode D2, PIN diode D1, PIN diode D3, PIN diode D4 and chip capacitor C3 are connected via a suspended microstrip transmission line, and the PIN diode D1 and chip capacitor C1 are also connected via a suspended microstrip transmission line.

7. The novel suspended stripline broadband high-power switch according to claim 4, characterized in that: The other end of the choke air-core coil L5 is connected to the choke air-core coil L6 and the grounded high-voltage filter capacitor C7 through a control device connection line, and the other end of the choke air-core coil L6 is connected to the driver and the grounded high-voltage filter capacitor C6 through a control device connection line.

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