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Broadband Printed Antenna Element
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807 Fig 1.png
Figure 1. Geometry of the proposed antenna element.
807 Fig 2.png
Figure 2. The fabricated antenna. (a) Bottom view (from top to bottom), (b) top view and (c) NSI 2000 measurement system.
807 Table 1.png
Table 1. Comparison between the current work (bottom row) and those in references.

Opportunity

5G and WiMAX need high gain and high polarization purity antenna for communication systems with symmetrical and stable radiation pattern.  But there is a tradeoff between the thickness of printed antennas and their electrical performances. This invention provides a novel linearly-polarized printed antenna with wideband, stable radiation pattern and low cross polarization characteristics.  The proposed antenna can easily be used for constructing an antenna arrays based on substrate-integrated-waveguide (SIW) technology.  Parasitic elements are employed in the antenna to reduce the profile of the antenna.  The thin profile will find many applications where antenna housing space is limited.

Technology

The invention is a linearly polarized antenna consisting of a printed dipole differential-fed by a dumbbell-shaped slot, with four parasitic patches in the proximity to the dipole. With this configuration, it provides a wideband and high gain antenna with stable radiation pattern in the whole operating frequency band.  The introduction of the parasitic patches reduces the thickness of this element, making it a low profile antenna.  The shorter vertical differential current impact less on the horizontal currents on the dipole and parasitic patches, leading to low cross polarization.  With SIW feed technology, an open slot is cut on the top surface to couple energy to the differentially-fed printed dipole with two metal posts located at the opposite sides of the slot.  Four parasitic patches are then placed in the proximity to the dipole to improve the antenna impedance bandwidth.  The antenna element is housed in a SIW cavity for higher antenna gain. 

Advantages

  • The invention has wide impedance bandwidth, stable radiation pattern, low cross-polarization level and low backlobe.  
  • The invention has a thickness of 0.07 lo , where lo  is the free space wavelength at the center frequency, without scarifying the antenna performance versus typical ME(magneto-electric) dipole having a thickness of 0.25 lo.

Applications

  • 3G, 4G, 5G communications
  • WiMax
IP Status
Patent granted
Technology Readiness Level (TRL)
4
Inventor(s)
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Broadband Printed Antenna Element

 

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