Cognitive radio antenna assembly

Patent metadata

Field	Value
Publication number	US-2016261050-A1
Application number	US-201514641253-A
Country	US
Kind code	A1
Filing date	Mar 6, 2015
Priority date	Mar 6, 2015
Publication date	Sep 8, 2016
Grant date	—

Abstract

The cognitive radio antenna assembly includes two boards, a main board that has an ultra-wideband antenna (UWB) and also serves as a ground plane for the reconfigurable antenna, and an elevated MIMO board having two planar inverted-F antennas (PIFAs) that are reconfigurable to selectively operate on different frequency bands. Each PIFA has a radiating patch having a slot bridged by PIN diodes and DC blocking capacitors on opposite sides of the slot. The resonant frequency of each PIFA is controlled by which diodes are switched on and off. The PIFA antennas are shorted to the ground plane the (UWB antenna) on the main board by shorting walls. The PIFA antennas are capable of resonating from the 700 MHz band through 3000 MHz, while the UWB senses the spectrum over the entire bandwidth. The antenna assembly is compact, being suitable for cellular phone and wireless applications in 4G wireless standards.

First claim

We claim:

1 . A cognitive radio antenna assembly, comprising:
a main board having a top face and a bottom face, the bottom face having an ultra-wideband spectrum sensing antenna disposed thereon, the top face having a ground plane for the ultra-wideband antenna disposed thereon; an upper MIMO board disposed above the main board, the MIMO board having a pair of reconfigurable multiband planar inverted-F antennas (PIFAs) disposed thereon; and shorting walls connecting each of the PIFA antennas to the ultra-wideband antenna, the ultra-wideband antenna providing a ground plane for the PIFA antennas.

2 . The cognitive radio antenna assembly according to claim 1 , wherein the ultra-wideband antenna is a monopole antenna.

3 . The cognitive radio antenna assembly according to claim 1 , wherein the reconfigurable multiband PIFA antennas are elevated patch antennas having a slot defined therein, the slot having slits on opposing sides, each of the elevated patch antennas having an upper portion above the slot, a lower portion below the slot, and PIN diodes connected between the upper portion and the lower portion on opposite sides of the slot, the PIN diodes selectively shorting the upper and lower portions of the patch antennas when the diodes are conducting in order to selectively change the electrical length and resonant frequencies of the patch antennas.

4 . The cognitive radio antenna assembly according to claim 1 , wherein the ultra-wideband antenna and the reconfigurable multiband PIFAs are operable in frequency bands between 700 MHz and 3 GHz.

5 . The cognitive radio antenna assembly according to claim 1 , wherein the assembly is a substantially flat assembly measuring about 65×120 mm 2 , being dimensioned and configured for use in smart phones and LTE mobile handsets.

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Sharawi Mohammad S
• Hussain Rifaqat

Classifications

• H01Q21/30 Primary

  Combinations of separate antenna units operating in different wavebands and connected to a common feeder system · CPC title

• H01Q1/38

  formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface  H01Q15/142)} · CPC title

• H01Q9/42

  with folded element, the folded parts being spaced apart a small fraction of the operating wavelength · CPC title

• H01Q1/243 Primary

  with built-in antennas · CPC title

• H01Q5/321

  within a radiating element or between connected radiating elements · CPC title