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CN-121983796-A - High-order-mode-driven inductance-loaded compact high-gain yagi antenna

CN121983796ACN 121983796 ACN121983796 ACN 121983796ACN-121983796-A

Abstract

The invention provides a high-order mode-driven inductance loading compact high-gain yagi antenna which comprises an antenna and a feed balun, wherein the antenna comprises a driving unit positioned on the upper surface of an antenna medium substrate, a reflecting unit and a steering unit which are respectively positioned on two sides of the driving unit, a slot hole is formed in the middle of the driving unit, the feed balun comprises a conduction band strip positioned on the central line of the upper surface of a supporting substrate and a ground strip respectively positioned on the central line of the lower surface of the supporting substrate, and the supporting substrate is vertically inserted into the slot hole of the antenna medium substrate from the lower surface of the antenna medium substrate. By adopting the inductance loading bending driving unit, the transverse size of the yagi antenna driven by the high-order mode is reduced, and the high-gain directional radiation characteristic of the antenna is realized. By adjusting the position and the length of the reflecting unit, the matching performance of the yagi antenna is improved. The invention can realize high gain of the high-order mode driving yagi antenna and simultaneously reduce the transverse size of the antenna.

Inventors

  • DENG YAN

Assignees

  • 盐城师范学院

Dates

Publication Date
20260505
Application Date
20260228

Claims (10)

  1. 1. The high-order mode-driven inductance loading compact high-gain yagi antenna is characterized by comprising an antenna (1) and a feeding balun (2), wherein the antenna (1) comprises a driving unit (11) positioned on the upper surface of an antenna medium substrate (15), reflecting units (13) and a guiding unit (14) which are respectively positioned on two sides of the driving unit (11), a slot hole (12) is formed in the middle position of the driving unit (11), the feeding balun (2) comprises a conduction band strip (21) positioned on the central line of the upper surface of a supporting substrate (23) and a ground strip (22) respectively positioned on the central line of the lower surface of the supporting substrate (23), and the supporting substrate (23) is vertically inserted into the slot hole (12) of the antenna medium substrate (15) from the lower surface of the antenna medium substrate (15).
  2. 2. The high-order mode-driven inductance loading compact type high-gain yagi antenna according to claim 1, wherein the driving unit (11) is of an inductance loading bending structure, and comprises a left U-shaped ring formed by sequentially connecting a first driving piece (111), a first inductance (115) and a third driving piece (113), a right U-shaped ring formed by sequentially connecting a second driving piece (112), a second inductance (116) and a fourth driving piece (114), and a slot hole (12) is positioned between the left U-shaped ring and the right U-shaped ring, wherein the slot hole (12) penetrates through an antenna dielectric substrate (15).
  3. 3. The high-order mode-driven inductance loading compact type high-gain yagi antenna according to claim 2, wherein the first driving piece (111), the second driving piece (112), the third driving piece (113) and the fourth driving piece (114) are all composed of conductor strips, the first driving piece (111) is composed of a first main arm (1111), a first middle arm (1112) and a first tail arm (1113) which are sequentially and vertically connected, one end of the first main arm (1111) is located at one edge of a slot hole (12) and is vertically connected with a conduction band strip (21) of a feed balun (2), a first inductance (115) is connected between the first tail arm (1113) and the third driving piece (113), the other end of the third driving piece (113) is open, and the first main arm (1111) is parallel to the first tail arm (1113) and the third driving piece (113).
  4. 4. The high-order mode-driven inductance-loaded compact high-gain yagi antenna according to claim 2, wherein the second driving element (112) is formed by sequentially and vertically connecting a second main arm (1121), a second middle arm (1122) and a second tail arm (1123), one end of the second main arm (1121) is positioned at one edge of the slot hole (12) and is vertically connected with the first metal strip (221) of the feeding balun (2), the second inductor (116) is connected between the second tail arm (1123) and the fourth driving element (114), the other end of the fourth driving element (114) is open, and the second main arm (1121) is parallel to the second tail arm (1123) and the fourth driving element (114).
  5. 5. The high-order mode-driven inductance-loaded compact high-gain yagi antenna of claim 2, wherein the reflecting unit (13) is composed of a conductor strip, is positioned outside the first main arm (1111) and the second main arm (1121) of the driving unit (11) in parallel, and is line-symmetrical with respect to the longitudinal direction of the slot hole (12).
  6. 6. The high-order mode-driven inductance-loaded compact high-gain yagi antenna of claim 2, wherein the director unit (14) is composed of a conductor strip, is positioned outside the third driving piece (113) and the fourth driving piece (114) of the driving unit (11) in parallel, and is line-symmetrical with respect to the extension of the slot hole (12) in the long axis direction.
  7. 7. The high-order mode-driven, inductively-loaded, compact, high-gain yagi antenna of claim 1 wherein said drive unit (11) is spaced from said reflecting unit (13) by less than 0.5 wavelengths, and wherein said drive unit (11) is spaced from said steering unit (14) by less than 0.5 wavelengths.
  8. 8. The high-order mode-driven, inductively loaded, compact, high-gain yagi antenna of claim 1 wherein said first inductor (115) is no more than one tenth of the maximum operating wavelength away from the open end of the third driver (113), the second inductor (116) is no more than one tenth of the maximum operating wavelength away from the open end of the fourth driver (114), and the inductance values of the first inductor (115) and the second inductor (116) are equal and are both less than the inverse of the product of the square of the maximum operating frequency and the equivalent capacitance of the third driver (113).
  9. 9. The high-order mode-driven inductance loading compact type high-gain yagi antenna according to claim 1, wherein the conduction band strip (21) on the upper surface of the feed balun (2) is composed of a conductor strip formed by sequentially connecting a first metal strip (211), a second metal strip (212), a third metal strip (213), a fourth metal strip (214) and a fifth metal strip (215) in a straight line, and the first metal strip (211) is inserted into the slot hole (12).
  10. 10. The high-order-mode-driven inductance-loaded compact high-gain yagi antenna according to claim 1, wherein a ground strip (22) on the lower surface of the feed balun (2) is formed by sequentially connecting a sixth metal strip (221), a seventh metal strip (222) and an eighth metal strip (223), the sixth metal strip (221) is in a strip shape, the seventh metal strip (222) is in a triangle shape, the eighth metal strip (223) is in a rectangle shape, the conduction band strip (21) and the ground strip (22) form three sections of independent microstrip transmission lines with different impedances to form a quarter-wavelength impedance conversion structure together, the first metal strip (211) and the second metal strip (212) form a gradual impedance conversion structure together with the sixth metal strip (221) and the seventh metal strip (222), and the sixth metal strip (221) is inserted into the slot hole (12).

Description

High-order-mode-driven inductance-loaded compact high-gain yagi antenna Technical Field The invention belongs to the technical field of wireless communication antennas, and particularly relates to a high-order mode driving yagi antenna with compact structure and high gain performance. Background The Yagi antenna (Yagi-Uda antenna) is used as a classical directional array antenna, consists of a driving unit, a reflecting unit and a guiding unit, and is widely applied to various wireless communication systems by virtue of the advantages of simple structure and strong directional radiation capability. As communication technology advances toward a high-frequency band (such as millimeter waves), the path loss of electromagnetic waves increases significantly with increasing frequency, and higher requirements are put on the gain performance of antennas. Yu Luo published "Millimeter-Wave Gain-Enhanced Yagi–Uda Antenna Array With Third-Order-Mode Driven Dipole and Short Reflector" on IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION as a yagi antenna driven in a higher order mode, the maximum gain of which reaches 8.1. 8.1 dBi. However, the scheme has the key defect that the transverse dimension of the antenna is increased to one half wavelength from the traditional half wavelength due to the high-order mode driving structure, the volume is redundant, and the application requirement of modern communication equipment on miniaturization cannot be met. Therefore, developing a compact yagi antenna that achieves a substantial reduction in lateral dimensions while maintaining high-gain characteristics of high-order mode driving is a technical problem to be solved in the art. Disclosure of Invention The invention aims to provide a high-order mode-driven inductance loading compact high-gain yagi antenna, which not only reduces the transverse size of the antenna, but also can improve the uniform intensity of current on a driving unit, thereby increasing the equivalent radiation caliber and realizing a compact and high-gain antenna. The technical scheme is that the high-order mode-driven inductance loading compact high-gain yagi antenna comprises an antenna and a feed balun, wherein the antenna comprises a driving unit positioned on the upper surface of an antenna medium substrate, a reflecting unit and a guiding unit which are respectively positioned on two sides of the driving unit, a slot hole is formed in the middle of the driving unit, the feed balun comprises a conduction band strip positioned on the central line of the upper surface of a supporting substrate and a ground strip respectively positioned on the central line of the lower surface of the supporting substrate, and the supporting substrate is vertically inserted into the slot hole of the antenna medium substrate from the lower surface of the antenna medium substrate. The driving unit is of an inductance loading bending structure and comprises a left U-shaped ring formed by sequentially connecting a first driving piece, a first inductance and a third driving piece, a right U-shaped ring formed by sequentially connecting a second driving piece, a second inductance and a fourth driving piece, a slot hole is positioned between the left U-shaped ring and the right U-shaped ring, and the slot hole penetrates through an antenna dielectric substrate. The first driving piece, the second driving piece, the third driving piece and the fourth driving piece are all composed of conductor strips, the first driving piece is composed of a first main arm, a first middle arm and a first tail arm which are sequentially and vertically connected, one end of the first main arm is located at one edge of a slot hole and is vertically connected with a conduction band strip of a feed balun, a first inductor is connected between the first tail arm and the third driving piece, the other end of the third driving piece is open, and the first main arm is parallel to the first tail arm and the third driving piece. The second driving piece is formed by sequentially and vertically connecting a second main arm, a second middle arm and a second tail arm, one end of the second main arm is positioned at one edge of the slotted hole and is vertically connected with the first metal strip of the feed balun, a second inductor is connected between the second tail arm and the fourth driving piece, the other end of the fourth driving piece is open, and the second main arm is parallel to the second tail arm and the fourth driving piece. The reflecting unit consists of conductor strips, is positioned outside the first main arm and the second main arm of the driving unit in parallel, and is symmetrical with respect to the extending line of the long axis direction of the slotted hole. The guiding unit consists of conductor strips, is positioned outside the third driving piece and the fourth driving piece of the driving unit in parallel, and is symmetrical with respect to the extending line of the long axis directi