Enhanced L-band and S-band four-frequency four-arm spiral circular polarization sleeve antenna

Abstract

The invention discloses an enhanced L-band and S-band four-frequency four-arm spiral circular polarization sleeve antenna, and the antenna comprises a radio frequency module which is used for transmitting a single-end radio frequency signal through a welding point at a SIGNAL; the Marchand balun module is used for converting a radio frequency signal of a single end into two radio frequency signals S1 / S2 of 0 degree / 180 degrees from a Marchand balun; the LC orthogonal coupling circuit is used for dividing the radio frequency signal S1 / S2 into two radio frequency signals S11 / S12 and S21 / S22 with a phase difference of 90 degrees; the transmitting module is used for enabling the four paths of signals S11 / S12 / S21 / S22 to correspond to four receiving and transmitting frequency bands of the L wave band and the S wave band respectively, and radiating the signals through four radiating arms; and the GND module is used for providing a symmetric reference ground plane for the four radiation arms to form a complete radio frequency current path. According to the invention, the common-mode current generated when the antenna works is effectively suppressed, that is, the design defect caused by the process level during actual manufacturing is reduced, and the radiation performance of the antenna is further improved.

Description

Technical Field

[0001] This invention relates to an enhanced L-band and S-band quad-band four-arm spiral circularly polarized sleeve antenna. Background Technology

[0002] Traditional four-arm spiral antennas use a phase shifter to transform the phase of the radio frequency signal into 0°, 90°, 180°, and 270°. The four signals obtained after transformation are respectively connected to the four spirally wound radiating arms and radiated outwards. When applied to handheld device solutions, under the premise of miniaturization, if there are size differences in the manufacturing of the four radiating arms, or differences in the dielectric constant of the materials, or unevenness in the connection solder joints, common-mode current will be generated when the antenna is working, which will seriously degrade its actual performance.

[0003] Therefore, an enhanced L-band and S-band quad-band four-arm spiral circularly polarized sleeve antenna is provided. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides an enhanced L-band and S-band quad-band four-arm spiral circularly polarized sleeve antenna, which effectively suppresses the common-mode current generated during antenna operation, thereby reducing design defects caused by the actual manufacturing process and improving the antenna's radiation performance.

[0005] The technical solution to achieve the above objectives is: An enhanced L-band and S-band quad-band four-arm spiral circularly polarized sleeve antenna, comprising: The radio frequency module is used to transmit single-ended radio frequency signals through the solder joint at SIGNAL. The Marchand balun module is used to convert a single-ended RF signal into two RF signals S1 / S2 at 0° / 180° using a Marchand balun. An LC quadrature coupling circuit is used to divide the radio frequency signal S1 / S2 into two radio frequency signals S11 / S12 and S21 / S22 with a phase difference of 90°, respectively. The transmitting module is used to transmit and receive the four signals S11 / S12 / S21 / S22 at the corresponding L and S band frequencies, and radiate them out through the four radiating arms. The GND module is used to provide a symmetrical reference ground plane for the four radial arms, forming a complete RF current path.

[0006] Preferably, the Marchand balun module is a microstrip line or an actual device.

[0007] Preferably, the LC orthogonal coupling circuit is a microstrip line or an actual device.

[0008] Preferably, in the LC quadrature coupling circuit, the radio frequency signal S1 is divided into two radio frequency signals S11 / S12 with a phase difference of 90°. The radio frequency signal S11 is the 0° signal after the phase shift of the radio frequency signal S1 by the circuit, and the radio frequency signal S12 is the 90° signal after the phase shift of the radio frequency signal S1 by the circuit.

[0009] Preferably, in the LC quadrature coupling circuit, the radio frequency signal S2 is divided into two radio frequency signals S21 / S22 with a phase difference of 90°. The radio frequency signal S21 is the 180° signal of the radio frequency signal S2 after phase shifting by the circuit, and the radio frequency signal S22 is the 270° signal of the radio frequency signal S2 after phase shifting by the circuit.

[0010] Preferably, the GND module adopts a stepped sleeve grounding structure, with the inner layer being L-band and the outer layer being S-band.

[0011] Compared with the prior art, the beneficial effects of this invention are as follows: This invention uses a Marchand balun and an LC quadrature coupling circuit to replace the traditional phase shifter; the radio frequency characteristics of the Marchand balun exhibit a high impedance effect for common-mode current and a low impedance effect for differential-mode current; therefore, the common-mode current generated by the antenna during operation will be well suppressed and flow back to the antenna feed position, so that its energy is mainly radiated out in the form of radiation, thereby improving the antenna gain and circular polarization; in actual testing or use, such as close-to-head testing, the effective suppression of common-mode current generation will also result in better performance. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of an enhanced L-band and S-band quad-band four-arm spiral circularly polarized sleeve antenna according to the present invention. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] like Figure 1 As shown, an enhanced L-band and S-band quad-band helical circularly polarized sleeve antenna includes: an RF module 1, a Marchand balun module 2, an LC orthogonal coupling circuit 3, a transmitting module 4, and a GND module 5.

[0015] RF module 1 is used to transmit a single-ended RF signal through the solder joint at SIGNAL.

[0016] The Marchand balun module 2 is used to convert a single-ended RF signal into two RF signals S1 / S2 at 0° / 180° using the Marchand balun.

[0017] In this embodiment, the Marchand balun module is a microstrip line or an actual device; the Marchand balun is a key device used for balanced-to-unbalanced switching in radio frequency microwave circuits. It is favored for its wide bandwidth, good amplitude and phase balance, and ease of integration into planar circuits.

[0018] The LC quadrature coupling circuit 3 is used to divide the radio frequency signal S1 / S2 into two radio frequency signals S11 / S12 and S21 / S22 with a phase difference of 90°.

[0019] In the embodiments, the LC orthogonal coupling circuit is a microstrip line or an actual device.

[0020] In this embodiment, the radio frequency signal S1 is divided into two radio frequency signals S11 / S12 with a phase difference of 90°. S11 is the 0° signal after phase shifting of the radio frequency signal S1 by the circuit, and S12 is the 90° signal after phase shifting of the radio frequency signal S1 by the circuit.

[0021] In this embodiment, the radio frequency signal S2 is divided into two radio frequency signals S21 / S22 with a phase difference of 90°. The radio frequency signal S21 is the 180° signal of the radio frequency signal S2 after phase shifting by the circuit, and the radio frequency signal S22 is the 270° signal of the radio frequency signal S2 after phase shifting by the circuit.

[0022] Transmitting module 4 is used to transmit and receive the four signals S11 / S12 / S21 / S22 at the corresponding L and S band frequencies, and radiate them out through four radiating arms.

[0023] GND module 5 is used to provide a symmetrical reference ground plane for the four radial arms, forming a complete RF current path.

[0024] In this embodiment, the GND module adopts a stepped sleeve grounding structure, with the inner layer being the L-band and the outer layer being the S-band.

[0025] The working process and principle are as follows: The radio frequency (RF) signal is converted from the solder joint at SIGNAL to two RF signals S1 / S2 at 0° and 180° via the Marchand balun. The 0° RF signal S1 is then split into two signals S11 (0°) / S12 (90°) with a 90° phase difference via an LC quadrature coupling circuit. The other 180° RF signal S2 is split into two signals S21 (180°) / S22 (270°) with a 90° phase difference via an LC quadrature coupling circuit. In practical applications, the four signals S11 / S12 / S21 / S22 are used for the L and S bands respectively, that is, the four signals S11 / S12 / S21 / S22 are radiated through the four radiating arms of the antenna.

[0026] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An enhanced L-band and S-band quad-band four-arm spiral circularly polarized sleeve antenna, characterized in that, include: The radio frequency module is used to transmit single-ended radio frequency signals through the solder joint at SIGNAL. The Marchand balun module is used to convert a single-ended RF signal into two RF signals S1 / S2 at 0° / 180° using a Marchand balun. An LC quadrature coupling circuit is used to divide the radio frequency signal S1 / S2 into two radio frequency signals S11 / S12 and S21 / S22 with a phase difference of 90°, respectively. The transmitting module is used to transmit and receive the four signals S11 / S12 / S21 / S22 at the corresponding L and S band frequencies, and radiate them out through the four radiating arms. The GND module is used to provide a symmetrical reference ground plane for the four radial arms, forming a complete RF current path.

2. The enhanced L-band and S-band quad-band four-arm spiral circularly polarized sleeve antenna according to claim 1, characterized in that, The Marchand balun module can be a microstrip line or an actual device.

3. The enhanced L-band and S-band quad-band four-arm spiral circularly polarized sleeve antenna according to claim 1, characterized in that, The LC orthogonal coupling circuit is a microstrip line or an actual device.

4. The enhanced L-band and S-band four-band four-arm spiral circularly polarized sleeve antenna according to claim 1, characterized in that, In the LC quadrature coupling circuit, the radio frequency signal S1 is divided into two radio frequency signals S11 / S12 with a phase difference of 90°. Among them, the radio frequency signal S11 is the 0° signal after the phase shift of the radio frequency signal S1 by the circuit, and the radio frequency signal S12 is the 90° signal after the phase shift of the radio frequency signal S1 by the circuit.

5. The enhanced L-band and S-band quad-band four-arm spiral circularly polarized sleeve antenna according to claim 1, characterized in that, In the LC quadrature coupling circuit, the radio frequency signal S2 is divided into two radio frequency signals S21 / S22 with a phase difference of 90°. Among them, the radio frequency signal S21 is the 180° signal of the radio frequency signal S2 after phase shifting by the circuit, and the radio frequency signal S22 is the 270° signal of the radio frequency signal S2 after phase shifting by the circuit.

6. The enhanced L-band and S-band quad-band four-arm spiral circularly polarized sleeve antenna according to claim 1, characterized in that, The GND module adopts a stepped sleeve grounding structure, with the inner layer being the L-band and the outer layer being the S-band.

Images