Bandwidth Enhancement of a Monopolar Patch Antenna With V-Shaped Slot for Car-to-Car and WLAN Communications

Abstract

A monopolar patch antenna with a V-shaped slot for Car-to-Car (C2C) and WLAN communications is presented in this paper. To widen the impedance bandwidth of the antenna, techniques of adding shorting pin and a V-shaped slot are applied to an equilateral triangular patch. By properly placing the shorting pins on an equilateral triangular patch, two operating modes, TM 10 and TM 20 , are obtained. The presence of the V-shaped slot can generate an additional TM 11 mode. These three resonances found in the operating frequency bandwidth resulted in a wideband characteristic. The proposed antenna can operate from 4.82 to 6.67 GHz for the reflection coefficient  -10 dB with the gain of around 5.0 dBi. In addition, an omnidirectional radiation pattern is yielded by a coaxial centred-fed probe excitation. The antenna has a thickness of 0.09 g (at the centre frequency of 5.5 GHz), which is easily hidden on the roof of a vehicle for C2C communication. This proposed design can also be used as indoor base station antennas for WLAN communication.

On the multi‐resonant antennas: Theory, history, and new development

“…As discussed and presented in ref. [], a low profile, wideband car‐to‐car (C2C) communication antenna has been implemented. Boosted by the automotive communications requirements in future intelligent applications, it is expected that more multi‐resonant, low‐profile C2C antennas with enhanced performance and simplified configuration would be developed in the future …”

Generalized design approach to compact wideband multi-resonant patch antennas

“…Compared to the design in Reference , the maximum dimension of the antenna can be effectively reduced by about 23.0%. As the proposed antenna exhibits stable unidirectional beams without grating lobes, it exhibits more promising potential as well for array applications than their counterparts in Reference . The proposed design approach can be directly implemented on a thin, single‐layered air substrate without introducing additional feed accessories, reactance compensation networks, or lumped loads, such as stacked feedlines, multilayered coupled feed network, and lumped/post loaded configurations, In addition, a set of closed‐form design formulas of Equations ‐ is available, and it can be employed to calculate the key parameters of the resultant antenna.…”

“…Although for most of the wideband designs, only the fundamental mode within a single patch radiator is excited and used for the purpose of radiation. If multiple resonant modes with similar radiation properties can be excited in a single patch radiator and then properly tuned to be in proximity, a wideband microstrip patch antenna can be designed and implemented . Most of the multi‐resonant, wideband patch antennas exhibit relatively bulk sizes of about one wavelength .…”

Printed Planar Antenna Designs Based on Metamaterial Unit- Cells for Broadband Wireless Communication Systems

“…Slotted patch antennas are excellent candidates for broadband applications [9,[14][15][16][17][18][19][20][21][22][23][24]. In this section, a compact planar slotted antenna (PSA) is designed and characterized.…”