Broadband planar printed antenna

Abstract

The invention discloses a broadband planar printed antenna, which comprises a dielectric substrate, wherein the front of the dielectric substrate is printed with a similar C-shaped radiating element and a floor, and the back of the dielectric substrate is printed with a reverse L-shaped radiating element and a micro-strip feed line. A vertical branch in the reverse L-shaped radiating element and a second branch of a tail end open circuit element in the similar C-shaped radiating element are partially overlapped on a mirror image projection plane vertical to the dielectric substrate, and the reverse L-shaped radiating element and the similar C-shaped radiating element form cross coupling. The broadband planar printed antenna has the advantages of simple and compact structure and easiness in processing, has a certain gain and better omnidirectional radiation characteristics, and is especially suitable for a wireless communication device of a hand-held terminal.

Description

technical field [0001] The invention relates to a planar printed antenna, in particular to a broadband planar printed antenna. Background technique [0002] With the rapid development of wireless communication technology, while people enjoy the convenience of communication services in various frequency bands, they also put forward higher requirements for antenna designers. As the key part of transmitting and receiving wireless signals, the antenna has been paid more and more attention, and its performance index directly affects the quality of wireless communication. Especially for handheld terminal antennas, it has become one of the trends in antenna design to design a built-in antenna with compact structure, light weight, simple implementation, multi-frequency, and wide-band characteristics. Planar printed antennas have the advantages of flexible design, low profile, light weight, easy conformability, and low cost, and have attracted much attention from antenna researchers...

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Problems solved by technology

For example, in April 2008, "IEEE Antenna and Propagation Transactions", Vol. 56, No. 4, pp. 1155-1162, "A Novel Low-Profile Broadband Dual-Band Planar Antenna for Wireless Handheld Devices" (" A novel low-profile broadband dual-frequency planar antenna for wireless handsets,”IEEE Trans.Antennas Propagat.,vol.56,no.4,pp.1155-1162,April 2008), the antenna utilizes a dual stripline structure, and The mutual coupling between the double-strip line and the planar monopole can effectively increase the bandwidth. The low-frequency band achieves 35% of the bandwidth, and the high-frequency band reaches 15%. However, the cost of the antenna dielectric plate is high and the structure is relatively complicated.

Another example is "Compact size planar folded PIFA design for mobile handheld devices" proposed in "Microwave Optical Technology Letters" in May 2011, Volume 53, Issue 5, Pages 1045-1050 for mobile handset," Microwave and Optical Technology Lett., vol.53, no.5, pp.1045-1050, May 2011), the antenna covers four frequency bands including GSM, DCS, PCS, Wlan, the Not only is the structure simple and the size is compact, it is especially suitable for mobile terminals with high space requirements, but the bandwidth of the antenna is narrow, and the gain of each frequency band is low, especially the gain of the high frequency band is lower than -3db

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