JP3046609U - Broadband automatic tuning antenna - Google Patents

Abstract

(57) [Summary] (Problem corrected) [PROBLEMS] To enable low frequency band VHF or lower HF band and high frequency band VHF and UHF band with one antenna. SOLUTION: A variable coil 4 for loading provided with a rod 6 slid by a driving unit 7 and a contact unit electrically contacting the winding of the variable coil 4 are provided so that the variable coil can be slid. The length of the coil housing is set to 1 / 4λ for VHF and 5 / 8λ for UHF, and the matching section 3 for matching the antenna inductance is provided by the feeding section 1 connected to the wireless communication device. The high frequency side is separated from the power source of the drive unit 7, and the high frequency component is connected to the coil storage unit 2, the variable coil 4 and the rod 6 via the matching unit 3, and
When the antenna is tuned from the desired HF band to the VHF band, the variable coil inductors including the rods can be used for the high frequency VHF and UHF.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a broadband antenna having a tuning function, and more particularly to an antenna for setting a plurality of frequency bands in use.

[0002]

[Prior art]

 With respect to the frequency of the radio communication device, the transmission power in the HF band is restricted to 1 KW or less in the amateur radio. The transmission power of the 50 MHz band of the VHF is limited to 500 W, the power is 144 W for the 144 MHz VHF, the power of the UHF is 10 W for the 430 MHz band, and the power for the 1.2 GHz band and the 2.4 GHz band for vehicles is 1 W. . From such a relationship between frequency, transmission power, and usability, the 50 MHz band from the HF band to a low VHF frequency is used as a common antenna, and one antenna is used for the 144 MHz band for the high VHF frequency and the 430 MHz band for the UHF. I often use it. In the case of rod antennas used in vehicles, a common antenna was not used for the VHF 50MHz band or lower HF band antenna and the VHF 144MHz band or UHF 430MHz band. Assuming that the length of the antenna is 1/4 λ in the VHF of the 144 MHz band, it becomes 5/8 λ in the 430 MHz band of the UHF, and can be used as a shared antenna.

On the other hand, in the VHF 50 MHz band to the HF band, antenna tuning is mainly performed at 1 / 4λ. For this reason, antenna tuning was performed by preparing multiple loading coils for the rod antenna and replacing the loading coil each time the frequency was changed.

FIG. 3 is a schematic diagram of an antenna corresponding to a HF band below VHF in a 50 MHz band. Instead of replacing and using a plurality of loading coils for antenna tuning used in the VHF in the HF band to the 50 MHz band, an electrically variable antenna that continuously tunes a frequency band of 50 MHz or less with one loading coil. Are commercialized in the United States. USA's HIGH SIERRA ANTENAS's MODEL HS-1000 can change the range from 3.5 MHz to 30 MHz. J. Some BB-3s of the Antenna Company can vary the frequency from 3.5 MHz to 54 MHz. Since these antennas cannot cope with 144 MHz VHF or 430 MHz UHF, it is necessary to prepare a separate antenna when using them. In addition, since these antennas tune only with the variable coil and rod, the effect of the inductor on the other side of the variable coil remains, especially at higher frequencies.

[0005]

[Problems to be solved by the invention]

 In conventional antennas that can use one wave from the HF band to the low VHF frequency band and two waves from the high VHF frequency band and the UHF band, the loading coil for the HF band is replaced for each frequency band used. I'm using For this reason, many frequency bands cannot be used unless loading coils for other frequency bands are carried or secured.

[0006] The present invention addresses the need to carry a replacement loading coil in the HF band and the problem of separately requiring two antennas, a high frequency in the VHF band and a UHF band. It is an object of the present invention to provide a wide band automatic tuning antenna that can use one wave of a low frequency band and two waves of a high VHF frequency and a UHF band with one antenna.

[0007]

[Means for Solving the Problems]

 A loading variable coil that changes the tuning frequency by being slid by a drive unit by mounting a rod that corresponds to the radio communication frequency HF band to a low VHF frequency band, and a variable interior with the variable coil slidably mounted A coil housing that has a contact portion that contacts the coil winding and that is shaped to the length of the antenna for the frequency band where λ / 4 and 5 / 8λ have the same length in the VHF band and the UHF band in the high frequency band, respectively. A wideband antenna is formed by the unit and the matching unit, and in the frequency band from HF band to VHF low, the antenna is tuned to the desired frequency as the center loading by the variable coil equipped with the rod and the coil housing unit. In the high frequency band VHF and UHF bands, the variable coil becomes a high inductor, the variable coil with rod is cut off, and the coil housing becomes an antenna. It is a broadband automatic antenna.

[0008]

[Embodiment of the invention]

 FIG. 1 is a schematic diagram showing an embodiment of the broadband automatic tuning antenna of the present invention. The figure will be described. Reference numeral 1 denotes a power supply unit connected to a wireless communication device, and reference numeral 2 denotes a coil housing unit, which is an antenna element for a high VHF frequency of 144 MHz and a UHF 430 MHz band. 3 is a matching device, 4 is a variable coil for loading, and 5 is a contact portion at a fixed position with respect to the sliding variable coil provided at the tip of the coil housing portion 2 and is in contact with the conductor of the variable coil through the contact portion. Thus, the variable coil and the coil housing are electrically connected. 6 is a rod, 7 is a drive part.

In the broadband antenna having the above configuration, the power supply unit 1 uses a coaxial connector to superimpose a high-frequency signal on DC by a well-known circuit, and connects a power supply for a transmission / reception unit and a driving unit of a wireless communication device. The high frequency component is separated from the power supply unit 1 and connected to the coil housing unit 2 through the matching unit 3. The matching unit 3 matches the antenna side to the 50Ω inductance of the coaxial cable from the matching coil and the capacitor. On the other hand, the driving unit 7 also includes a motor and a transmission unit that transmits a linear motion to the variable coil by rotation of the motor, and the variable coil slides either by rotation or by sliding without rotation.

The coil housing 2 has a length of ４λ of VHF in the 144 MHz band, and has a length of ／ λ for UHF in the 430 MHz band. For the VHF from the HF band to the 50 MHz band, a variable coil for loading is connected between the rod 6 and the coil housing 2 so that the center loading method is performed, and the operating frequency is set to 1 / 4λ by tuning operation.

The variable coil 4 for loading needs to be able to cover from the HF band to the 50 MHz band of VHF. For this reason, a coil wound as an inductor is used as a bobbin having a length of about 50 cm. It has a structure in which an uncoated conductor is wound so that the wires do not contact each other. The variable coil 4 for loading is inserted into the coil storage section 2 and attached so that only the contact section 5 contacts.

The antenna tuning from the HF band to the VHF band of 50 MHz is used by increasing the inductance of the variable coil 4 so that the variable coil 4 is extracted from the coil housing 2 when the frequency is low in the HF band. . In the case of a high frequency, the lower part of the variable coil 4 is used by being stored in the coil storage section 2. In the case of a low frequency in the HF band, the variable coil 4 is pulled out from the coil housing section 2 to increase the inductance of the variable coil 4 for use. In this tuned state, the inductor in the portion where the variable coil is not used is in the coil housing part which is a part of the antenna, and thus does not affect the antenna tuning.

For the automatic tuning of the broadband antenna, it is only necessary to operate the power supply supplied to the drive unit 7 under the control of the CPU of the wireless communication device so that proper antenna tuning corresponding to the frequency can be performed. Omitted.

[0014]

[Effect of the invention]

 The broadband automatic tuning antenna according to the present invention enables the tuning of the antenna from the HF band to the VHF 50 MHz band, and enables the sliding of the variable coil for loading and the variable coil for sliding which is slid by the drive unit to which the rod is mounted. The coil storage unit has a length of 1 / 4λ for the 144 MHz band of VHF and a length of ／ λ of 430 MHz for UHF. Are provided. When the driver tunes the antenna at a frequency of 50 MHz band or less, the VHF 144 MHz and UHF 430 MHz can be used in three frequency bands because the variable coil and the lot are separated by the variable coil inductor. effective.

[Brief description of the drawings]

FIG. 1 is a schematic view of a broadband automatic tuning antenna according to an embodiment of the present invention.

FIG. 2 shows an antenna in a frequency band from the HF band to a low VHF according to the related art.

FIG. 3 shows antennas for a high VHF frequency band and a UHF band.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power supply part 2 Coil accommodation part (V / U antenna element) 3 Matching part 4 Variable coil 5 Connection part 6 Antenna 7 Drive part

Claims (1)

[Utility model registration claims] 1. A loading variable coil for changing a tuning frequency by being slid by a driving unit by mounting a rod corresponding to a radio communication frequency HF band to a low VHF frequency band, and the variable coil being slidable. And a contact portion for contacting the winding of the variable coil. The length of the antenna for the frequency band is such that λ / 4 and 5 / 8λ are the same length in the VHF band and the UHF band in the high frequency band. A broadband antenna is formed by the formed coil housing portion and the matching portion.
For a low frequency band of HF, the variable coil provided with the rod and an antenna tuned to a desired frequency as a center loading by the coil housing portion, and a high frequency band VHF and UHF band have a high inductor with a variable coil. A wide band automatic tuning antenna characterized in that the variable coil with a rod is turned off and the coil housing becomes an antenna.