Multiband top loaded monopole antenna

Abstract

An apparatus (100) includes an antenna (102) (e.g., a monopole antenna), a first load (110), and a second load (112). The antenna (102), which extends substantially along an axis (103), has a first end (104) and a second end (106). The first load (110) is coupled to the antenna at the first end (104), while the second load (112) is coupled to the antenna (102) between the first end (104) and the second end (106). Both the first and second loads (110, 112) are symmetrical with reference to the axis. The apparatus is arranged to operate in at least two frequency bands, such as the Advanced Mobile Phone System (AMPS) band from about 824 MHz to about 894 MHz and the Personal Communications Service (PCS) band from about 1850 MHz to about 1990 MHz.

Description

technical field [0001] The present invention relates to a multi-band antenna and device. Background technique [0002] It is generally desirable to reduce the size of electronic components and devices. For example, there is a need for more compact antennas for use in various wireless applications. Additionally, there is a need for antennas capable of operating in multiple frequency bands. [0003] Typical vehicular antenna systems for cellular telephones use larger antenna elements (eg, three inches or larger) to meet specific performance requirements. Larger antenna elements are usually mounted on a base and are usually surrounded by flexible vibrating reeds or rigid blades. This arrangement enables a larger profile to be created on the outer surface of the vehicle. Unfortunately, this silhouette falls short of the goals and aesthetics of typical vehicle designs. [0004] Thus, there is a need to provide antennas and antenna arrangements that are of reduced size while ...

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Problems solved by technology

Unfortunately, this profile falls short of the goals and aesthetics of typical vehicle designs

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