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A Higher-Mode Annular-Ring Patch Antenna With a Photonic-Bandgap Ground Plane. Shun-Yun Lin Department of Electrical Engineering Cheng Shiu Institute of Technology Kaohsiung, Taiwan Email: linsy@ema.ee.nsysu.edu.tw Kin-Lu Wong Department of Electrical Engineering

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a higher mode annular ring patch antenna with a photonic bandgap ground plane

A Higher-Mode Annular-Ring Patch Antenna With a Photonic-Bandgap Ground Plane

Shun-Yun Lin

Department of Electrical Engineering

Cheng Shiu Institute of Technology

Kaohsiung, Taiwan

Email: linsy@ema.ee.nsysu.edu.tw

Kin-Lu Wong

Department of Electrical Engineering

National Sun Yat-Sen University

Kaohsiung, Taiwan

Email: wongkl@ema.ee.nsysu.edu.tw

outline
OUTLINE
  • INTRODUCTION
    • Annular-ring patch antenna operated at TM21 mode
    • Patch antenna with a PBG ground plane
  • ANTENNA DESIGNS
  • EXPERIMENTAL RESULTS
  • CONCLUSIONS
introduction 1
INTRODUCTION-1
  • The resonant frequency

of TMnm mode can be

calculated by the mode chart

  • As w/R is increased, the value

of kR becomes less than n for

a given mode

  • When the ring width reach

half the guided wavelength,

higher order TMnm(n0, m>1)

appear.

2w

R

introduction 2
INTRODUCTION-2
  • The typical radiation has a peak value at about 35° away

from broadside direction

  • Both horizontal and vertical planes have conical radiation

patterns

  • The radiated power in azimuth plane is non-uniform
slide5

INTRODUCTION-3

Patch antenna with slotted ground plane

Compact LP antenna

Compact DP antenna

Compact CP antenna

introduction 4
Patch antenna with Photonic BandGap ground plane

PBG structure is a periodic structure

The forbidden bands are characterized by

period of structure

shape of the individual element of the lattice

size of the individual element of the lattice

Applied to antenna design

isolation enhancement

harmonic control

gain enhancement

impedance bandwidth enhancement

INTRODUCTION-4
slide7

ANTENNA DESIGN-1

PBG ground plane

  • A square lattice of 3 x 3

circular slots are embedded

  • The ratio of the slot radius

to the PBG period is selected to be

0.25 to obtain optimum stopband

depth and passband ripples

  • The center frequency f0 of the

stopbandis determined from

f0 = c/2S

slide8

ANTENNA DESIGN-2

Slotted ground plane

  • Four circular slots are

embedded in ground plane

– have the same radius and

spacing as those embedded

in the PBG ground plane

– placed in perpendicular

to the surface current path

of TM21 mode

–located almost under the

annular-ring radiating patch

experimental results 1
EXPERIMENTAL RESULTS-1

Antenna with slotted ground plane

Antenna with PBG ground plane

Antenna with regular ground plane

experimental results 2
The resonant frequency of the antenna with a slotted ground plane was greatly lowered

The resonant frequency of the antenna with a PBG ground plane was slightly increased

The impedance bandwidth for both antennas with the slotted and PBG ground planes are larger than the reference antenna

EXPERIMENTAL RESULTS-2
experimental results 3
Good conical radiation patterns are observed for three studied antenna, especially for the antenna with PBG ground plane

The radiation patterns of the antenna with slotted ground plane has smaller beamwidth

EXPERIMENTAL RESULTS-3

(a) Ref. Antenna at 2380 MHz

(b)Antenna with slotted GND at 1920 MHz

(c) Antenna with PBG GND at 2460 MHz

experimental results 4
EXPERIMENTAL RESULTS-4
  • The studied antenna with slotted ground plane

has a patch size reduction of about 35%

  • The studied antenna with PBG ground plane has

a large F/B ratio of 12.1 dB

experimental results 5
EXPERIMENTAL RESULTS-5
  • The antenna with a slotted ground

plane has the largest peak antenna

gain

  • The gain variations of the antenna

with a PBG ground plane is less

than 0.5 dBi

Ref. antenna

Antenna with slotted GND

Antenna with PBG GND

conclusions
CONCLUSIONS
  • Annular-ring patch antenna with a slotted ground plane
    • Patch size reduced
    • Impedance bandwidth enhanced
    • Backward radiation increased
  • Annular-ring patch antenna with a PBG ground plane
    • Impedance bandwidth enhanced
    • F/B ratio enhanced
    • Small gain variations within the impedance bandwidth