Microstrip Antenna For Dual-frequency Operation Research Articles

Notched triangular microstrip antenna for dual-frequency operation

A novel equilateral triangular patch with a rectangular notch etched to one radiating edge on organic magnetic substrate is proposed for dual frequency operation. Both operations of these dual frequencies arise from the perturbation of TM10 and TM11 mode by simply cutting a rectangular notch at the patch bottom. Simulations and experiments have shown the validity of this design. Using an organic magnetic material as the substrate, the antenna exhibits a broader bandwidth of 5.5% and 4.7% at dual-frequencies 1.56 GHz and 2.45 GHz, respectively, as well as a reduced size compared to the dual-frequency patch antennas on non-magnetic material.

Single-feed dual-frequency rectangular microstrip antenna with a -shaped slot

A novel slotted rectangular microstrip antenna for dual-frequency operation is proposed. The microstrip antenna is fed by a single probe feed and has a π-shaped slot embedded close to the patch's radiating edge. The two operating frequencies have the same polarisation planes and similar broadside radiation characteristics. By varying the lengths and the spacing of the two arms of the π-shaped slot, the proposed antenna can have a tunable frequency ratio ranging from about 1.12 to 1.64. Simple semi-empirical formulas of the two operating frequencies have also been obtained. Details of the antenna design and experimental results are presented and discussed.

Dual‐frequency slotted triangular microstrip antenna with an inset microstrip‐line feed

A novel design of a slotted triangular microstrip antenna for dual-frequency operation is proposed and experimentally studied. By embedding an inverted V-shaped slot close to the vertex of a triangular microstrip patch, dual-frequency operation of the microstrip antenna can be achieved using an inset microstrip-line feed. The two operating frequencies have parallel polarization planes and broadside radiation characteristics. Also, the frequency ratio, in the range 1.37–1.59, of the two frequencies can be controlled by the length of the embedded slot. Details of the obtained dual-frequency performances are presented and discussed. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 27: 318–320, 2000.

Slot-loaded rectangular microstrip antenna for dual-frequency operation

A new design of a slot-loaded rectangular microstrip antenna for single-feed dual-frequency operation is proposed and experimentally studied. The slots loaded in the patch are a pair of bent slots centered in the patch and oriented along the resonant direction, with the spacing between the two slots being about half the patch's radiating-edge length. By varying the bent angle and horizontal-section length of the slots, the frequency ratio between the two operating frequencies is tunable in a range from about 1.28 to 1.79. The two frequencies are also of the same polarization planes and similar broadside radiation patterns. ©2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 24: 234–237, 2000.

A dual-frequency equilateral-triangular microstrip antenna with a pair of narrow slots

A new design of a slot-loaded equilateral-triangular microstrip antenna for dual-frequency operation is presented. Results show that, by loading a pair of narrow slots centered in the triangular patch and oriented parallel to the patch's center line, a single-feed dual-frequency operation can be achieved. The two operating frequencies are associated with the perturbed TM10- and TM20-modes of the triangular microstrip antenna, and the two frequencies are of the same polarization planes and similar broadside radiation characteristics. Also, by controlling the length of the slots and the spacing between the two slots, the frequency ratio of the two frequencies is tunable within a range of about 1.35–1.5. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 23: 82–84, 1999.

Slot-loaded bow-tie microstrip antenna for dual-frequency operation

By loading a pair of narrow slots close to the radiating edges of a bow-tie microstrip antenna, dual-frequency operation can be obtained using a single probe feed. Various frequency ratios, within the range 2.0-3.0, of the two operating frequencies can be obtained by varying the flare angle of the bow-tie patch. Details of the antenna design and experimental results are presented and discussed.

Microstrip antennas for dual-frequency operation

Single element microstrip antenna for dual-frequency operation have been investigated. By placing shorting pins at appropriate locations in the patch, the ratio of two-band frequencies can be varied from 3 to 1.8. In many applications a smaller ratio is desired, and this can be achieved by introducing slots in the patch. In so doing, the ratio can be reduced to less than 1.3. For this type of antenna, a hybrid multiport theory is developed and theoretical results are found to be in excellent agreement with the measured.

Single-element rectangular microstrip antenna for dual-frequency operation

The letter describes a single-element rectangular microstrip antenna which can operate simultaneously for two different frequency bands.