Circularly Polarized Microstrip Patch Antenna Research Articles

Design and Development of 1.575 Ghz Quarter-Wave Patch Antenna with Feed Line

This paper presents a quarter-wave patch antenna for GPS application which is realized by using shorting pins. The impact of the shorting relies upon the distance between the shorting posts, the radius of each shorting post, the number of shorting posts used and the height of the shorting posts which is determined by the thickness of the substrate used (which is 1.6mm for FR-4 substrate). A Right Hand Circularly Polarized Microstrip patch antenna with feed line for GPS frequency (1.575 GHz) is designed, simulated and fabricated. Simulation is done using ADS (Advanced Design System) and a fabricated prototype of the both the shorted and unshorted proposed antenna have been measured using Agilent Vector Network Analyzer.

3-D-Printed Tunable Circularly Polarized Microstrip Patch Antenna

We present a tunable circularly polarized (CP) microstrip patch antenna developed using three-dimensional (3-D) printing. Circular polarization is achieved by a novel method of introducing an L-shaped slot in a square patch antenna. Moreover, by loading the four edges of the patch with shunt varactors, the frequency of the antenna can be tuned while maintaining CP radiation. The use of 3-D printing for manufacturing enables the vertical integration of varactors between the patch and the ground, which has not been shown before. Such integration minimizes the interaction of varactors with the radiating properties of the antenna and results in reduced parasitics. Measured results show that the antenna has a frequency tuning range of 27.2% for CP operation with the center of tuning range around 1.9 GHz. The 3 dB axial-ratio bandwidth remains above 3% for each fixed frequency band of operation.

T-junction 전력 분배기를 이용한 ISM 대역의 원형 편파 마이크로스트립 패치 안테나 설계

T-junction 전력 분배기를 이용한 ISM 대역의 원형 편파 마이크로스트립 패치 안테나 설계

A dual-band circularly polarized microstrip patch antenna with a cross shaped slot for 0.92/2.45 GHz RFID applications

A dual-band circularly polarized microstrip patch antenna with a cross shaped slot for 0.92/2.45 GHz RFID applications

High-Gain Circularly Polarized Microstrip Patch Antenna With Loading of Shorting Pins

A single-fed microstrip patch antenna (MPA) with loading of shorting pins for high-gain circularly polarized (CP) radiation is proposed in this paper. Two sets of metallic pins are symmetrically placed along the two orthogonal diagonals of a square patch radiator at first. Due to the shunt inductive effect brought by these shorting pins, the resonant frequency of the dominant mode in this MPA is progressively tuned up so as to enlarge the electrical size of this pin-loaded patch resonator and to enhance its radiation directivity. After the optimal loading position is investigated for maximum directivity of linear polarization, one pair of the inner pins is slightly shifted in an offset to properly separate the two degenerate modes, so that the CP radiation can be excited. Moreover, upon request, either left-handed or right-handed circular polarization can be obtained by means of different position-offset scheme of the inner pins along the diagonals. After extensive analysis is executed, two equal-size CP MPAs with and without shorting pins are fabricated and tested. Simulated and measured results show good agreement and demonstrate that the CP directivity is enhanced from 8.0 (conventional MPA) to 10.8 dBic, indicating a 2.8-dB increment by means of the proposed approach.

Design and Analysis of Circularly Polarized Micro-strip Patch Antenna using HFSS

this paper, design and analysis of circularly polarised micro-strip patch antenna is presented. The use of circularly polarised antenna is an attractive solution to achieve polarization matching between the transmitting and receiving antenna. It is compact design of a square of 35.8 mm side with opposite corner by removing 11 mm each side on Rogers TMM4 substrate with dielectric constant of 4.5, thickness of 1.524mm and feed by a coaxial feed technique. The Proposed antenna is operated between 2.4-2.7 GHz with below 2 db VSWR. This antenna is having axial ratio below 3 db over the band of 2.55-2.69 GHz. The Parameter of this antenna such as radiation pattern, return loss, VSWR and axial ratio is simulated using HFSS software.

High Gain Patch Antenna for WBAN Applications

This paper proposes a Rectangular Circularly Polarized Microstrip Patch Antenna (RCPPA) that can be used for WBAN applications. The antenna is operating at 869.3 MHz, with enhanced gain, directivity and efficiency. With truncations on diagonally opposite sides and coaxial feed on Y axis a right hand circular polarization has been achieved. The antenna also shows reduction in surface waves, has no back radiation and is thinner in physical size, which makes it more suitable for WBAN applications. The properties of proposed antenna is then compared with Compact Slot Loaded Patch Antenna (CSLPA), which is already being used for WBAN applications.

Stacked Tri-Band Circularly Polarized Microstrip Patch Antenna for CNSS Applications

This paper proposes a novel stacked tri-band circularly polarized antenna which has three independent ports. To obtain tri-band operation, a stacked three layers of microstrip antenna working at different frequency is presented. Each of them is fed by dual feed probes. The simulated results show that the antenna can cover Compass Navigation Satellite System CNSS B3 1.268 GHz, L band 1.615 GHz and S band 2.49 GHz. The proposed antenna has achieved a bandwidth of 3.1%, 6.8% and 2.3% at each band, respectively. It exhibits small axial ratio under 3dB in three bands for the CNSS applications. Details of the proposed antenna design and results for the obtained tri-band circularly polarized performances are presented and discussed.

Broadband Circularly Polarized Microstrip Antenna Using L-Shaped Probe and H-shaped Aperture-Coupling

A simple technique to design circular polarized microstrip patch antenna with broad bandwidth is presented. Two different feed mechanisms are designed to excite the dual orthogonal linearly polarized modes from a single radiating patch for the operated frequency band at around 2.4 GHz. One of the two modes is excited by an L-shaped probe, and the other is excited by an H-shaped aperture. The proposed design has a very simple antenna structure with an impedance bandwidth of 75.92% and a 3-dB axial ratio (AR) bandwidth of 49.89%. The −3 dB gain bandwidth is about 32%, and the peak gain is 8.42 dBi at around 2.4 GHz. Measured results of the fabricated antenna prototypes are also carried out to verify the simulation analysis.

Antenna for Wireless Communications on Unmanned Aerial Vehicles

A compact circularly polarized microstrip patch antenna was designed and fabricated based on the virtual load and limited airframe size of Unmanned Aerial Vehicles (UAV) applications. This antenna is used for ISM frequency band and to enhance the integration of sensors and circuits in UAV communication system. The paper presented the simulation and the measured results. This antenna Experimental results show the 3dB axial ratio bandwidth is 0.6%, the half power beamwidth is ±45º, and the gain is 4.5dBi. The antenna size reduction can be as large as 36%, as compared to that of the conventional CP design.

Miniature Circularly Polarized Microstrip Patch Antenna with Rectangular Slots for GPS Application

A miniature circularly polarized (CP) microstrip patch antenna with rectangular slots for GPS application is presented. The antenna structure is composed of a square radiating patch and two rectangular slots. The two rectangular slots are incorporated to obtain CP characteristic, with one slot on the lower left corner of the square patch and the other on the upper right corner. By adjusting the dimensions and positions of the slots, the proposed antenna can exhibit CP radiation. Moreover, miniature properties are achieved by the use of very high permittivity substrate material. Simulated results by Ansoft HFSS are given.

Broadband Design of Circularly Polarized Microstrip Patch Antenna Using Artificial Ground Structure With Rectangular Unit Cells

This paper presents a broadband circularly polarized patch antenna using an artificial ground (AG) structure with rectangular unit cells as a reflector. The AG structure changes the reflection phase in accordance with the polarization state of the incident wave. By properly combining the transmitted wave from the antenna and the reflected wave from the AG structure, broadband circular polarization can be obtained. The AG structure and the antenna are simulated using a full-wave solver and the results show a 10 dB return loss bandwidth of 48.6% and a 3 dB axial ratio bandwidth of 20.4%. The measured results are in good agreement with the simulated results. The radiation characteristics of the antenna are almost the same as those for an antenna with a PEC reflector.

A New Design Method for Single-Feed Circular Polarization Microstrip Antenna With an Arbitrary Impedance Matching Condition

This paper introduces a new analytical method suitable for the design of the single-feed circular polarization (CP) microstrip patch antenna. Specifically, the proposed method imposes simultaneously the circular polarization condition as well as an arbitrary input impedance matching condition. The two conditions are enforced by an analytical method derived from an equivalent circuit model of a quasi-symmetrical patch antenna, and manipulated to control the modal detuning. This method can be used as an aid to speed up the design procedure for CP antennas even working with a numeric CAD tool. The validation of this approach is proven designing and fabricating a prototype implementing an original design, which consists of a circular disc slotted by a concentric elliptical cut with coaxial feed and operating at the center frequency of 2.45 GHz. The fabricated prototype exhibited a return loss of about 19 dB, within an impedance bandwidth of 130 MHz, a measured gain of 3.85 dB and a 0 dB axial ratio at 2.45 GHz with a corresponding modal phase difference of 87 degrees.

Compact Asymmetric-Slit Microstrip Antennas for Circular Polarization

Four compact asymmetric-slit microstrip antennas are proposed and studied for circular polarization. By cutting asymmetrical slits in diagonal directions onto the square microstrip patches, the single coaxial-feed microstrip patch antennas are realized for circularly polarized radiation with compact antenna size. The performances of the proposed antennas with several asymmetric-slit shapes onto the patch radiators are compared. The measured 10-dB return loss and 3-dB axial-ratio bandwidths of the antenna prototype are around 2.5% and 0.5%, respectively. The proposed asymmetric-slit configurations are useful for compact circularly polarized microstrip patch antennas and array design.

모서리 접지면 슬롯과 PIN 다이오드를 이용한 편파 변환 마이크로스트립 안테나

본 논문에서는 모서리 접지면 슬롯과 PIN 다이오드를 이용하여 2.4 GHz에서 활용 가능한 편파 변환 특성의 마이크로스트립 패치 안테나를 제안하였다. 제안된 안테나는 정사각형 구조의 마이크로스트립 패치와 접지면에 위치한 두 쌍의 슬롯과 PIN 다이오드로 이루어져 있다. 제안된 안테나에서는 PIN 다이오드의 스위칭 특성을 이용하여 접지면 슬롯의 전기적 길이를 조정하였고, 이를 통해 선형 편파와 좌회전 편파, 우회전 편파 간의 변환 을 구현하였다. 또한 DC 바이어스 회로로 인한 접지면의 분리를 통해서 안테나는 크기 감소 효과를 얻었다. 안테나의 설계 주파수는 2.4 GHz이며, 선형 편파로 동작할 때에는 15 dB의 반사 손실과 59 MHz의 임피던스 대역폭을 가지고, 좌회전 원형 편파와 우회전 원형 편파시 각각 1.17 dB, 1.67 dB의 최소 축비 특성과 28 MHz, 32 MHz의 3-dB 축비 대역폭을 가진다. In this paper, a switchable circularly polarized microstrip patch antenna using PIN diodes and corner slots on ground plane is proposed at 2.4 GHz. The proposed antenna has a square microstrip patch and ground plane that consists of two pair of slots and PIN diodes. The electrical lengths of the slots are adjusted by using the switching characteristic of the PIN diode, so the polarization of the proposed antenna can be switchable between linear, left-handed(LH) and right-handed(RH). By separating the ground plane for the DC bias, the size reduction effect is also obtained. When the proposed antenna is operated as linear polarization, the return loss and impedance bandwidth are 15 dB, 59 MHz, and when operated as LH and RH polarization, the minimum axial ratio and 3-dB axial ratio bandwidth are 1.17 dB, 1.67 dB, 28 MHz, and 32 MHz, respectively.

SIMULTANEOUS GAIN AND BANDWIDTHS ENHANCEMENT OF A SINGLE-FEED CIRCULARLY POLARIZED MICROSTRIP PATCH ANTENNA USING A METAMATERIAL REFLECTIVE SURFACE

This paper proposes a metamaterial re∞ective surface (MRS) as a superstrate for a single-feed circularly polarized microstrip patch antenna (SFCP-MPA). It illustrates a simultaneous enhancement on antenna gain, impedance bandwidth (ZBW) and axial-ratio bandwidth (ARBW) by adding the MRS atop the SFCP- MPA. The MRS can enhance the ZBW and ARBW by 3.5 and 9.9 times, respectively, compared to the circularly polarized patch source. Moreover, the gain of the CP-MPA with the MRS is 7dB higher than that of the conventional CP-MPA. The small spacing between the MRS and patch source is another merit in the present design, which is as low as ‚-/16, as it results in a low-proflle antenna design that well suits modern wireless communications.

Design and fabrication of the circularly polarized microstrip patch antenna

AbstractIn this article, circularly polarized microstrip patch antenna with a 5.8 GHz frequency for the Industrial Scientific Medical is designed and fabricated. The proposed modified cross‐slots antenna composed four separate slots by removing the intersection of the cross‐slot in conventional structure. The proposed antenna improved characteristics of the gain, radiation pattern, and impedance bandwidth than the conventional cross‐slots antenna. As a result, the proposed antenna obtains impedance bandwidth of 240 MHz (VSWR < 1.5) and maximal gain of 5 dBi. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1415–1418, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22441

Reconfigurable dual-band circularly polarized microstrip patch antenna for wireless applications

A new design of reconfigurable single-feed circular patch microstrip antenna for dual-band circular polarization application is proposed. The dual-band functionality is realized through incorporating cross-slots of equal slot length in the circular patch and utilizing two PIN diodes to switch the slots on or off. A pairs of tuning stubs are used to tune the circular polarization performance. The design process is presented and good results were obtained.

L-Shaped probe-feed circularly polarized microstrip patch antenna with a cross slot

A small-size circularly polarized (CP) microstrip patch antenna with a cross slot using a single L-shaped probe feed is designed and measured. This L-shaped probe single-feed CP antenna can achieve a wider impedance bandwidth, axial-ratio bandwidth, and gain bandwidth without using the phase shifters or hybrid couplers. Therefore, this simpler design of an L-shaped probe CP antenna is suitable for use in many communication systems. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 25: 251–253, 2000.

L-Shaped probe-feed circularly polarized microstrip patch antenna with a cross slot

A small-size circularly polarized (CP) microstrip patch antenna with a cross slot using a single L-shaped probe feed is designed and measured. This L-shaped probe single-feed CP antenna can achieve a wider impedance bandwidth, axial-ratio bandwidth, and gain bandwidth without using the phase shifters or hybrid couplers. Therefore, this simpler design of an L-shaped probe CP antenna is suitable for use in many communication systems. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 25: 251–253, 2000.