2 Meter Slot Antenna

The original inspiration came from HF meander antennas (physically short antenna for impractically long wavelength for a 'normal' dipole or vertical), but BT and wifi antennas inspired me to try to build something flat, maybe on a piece of PCB, but for much lower frequencies (2m or 70 cm) and make it usable in restricted conditions, e.g.

• How Build 2 Meter Slot Antenna From Dish
• 2 Meter Slot Antenna On Dish Antenna
• 2 Meter Skeleton Slot Antenna
• 2 Meter Slot Cube Antenna

• QM5 Yagi for 2 meters band - The QM5 antenna is a simple 5 elements Yagi with 1.88 m boom length for the lower 144 MHz SSB/MGM band, I used it mainly for Sporadic-E and MS contacts. It exhibits a forward gain of 9.17 dBd; i.e. 11.3 dB forward gain over the isotropic radiator, while the F/R is about 11.5 dB.
• Antenna's are resonant at 1/4, 1/2, 5/8, full-wave, multiples of full-wave and several other multiples. You could create a simple dipole for your FM radio by taking a piece of two-conductor speaker wire, compute your size by taking the middle of the FM band, 98mhz would be close. 300/98 = 3.06 meters.
• Region on the excitation and impedance of the slot antenna is significant to the antenna design. 8.2 SLOTTED-WAVEGUIDE ANTENNAS Slotted-waveguide antennas have significant applications in the areas of missile, spacecraft, and airborne radar. Broad-wall slotted-waveguide antennas have been studied extensively.
• Finished the antenna today with the updated dimensions and I am resonant at 152.4 mhz. Checking the 2 meter portion gives me a SWR of 4.2 It was a fun build, but just curious how your guys' cube came out. Dave Dec 28th 2018, 19:56: AD6ZH Joined: Jul 16th 2001, 00:00 Total Topics: 0 Total Posts: 0.

Tapered Slot Antenna (Vivaldi- Antenna)

Figure 1: Design of the (coplanar) Vivaldi antenna (The PCB material is shown transparently here.)

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Figure 1: Design of the (coplanar) Vivaldi antenna (The PCB material is shown transparently here.)

Figure 2: Exploded view drawing of a balanced antipodal Vivaldi antenna

How Build 2 Meter Slot Antenna From Dish

2 Meter Slot Antenna On Dish Antenna

Figure 2: Exploded view drawing of a balanced antipodal Vivaldi antenna

Tapered Slot Antenna (Vivaldi- Antenna)

Tapered Slot Antenna (TSA) (also-called: Vivaldi antenna) is an extremely broadband slot antenna (over several octaves), wherein the slot is widened conically. This antenna was presented at the 9th European Microwave Conference (EuMic) in 1979 by P. J. Gibson under the name 'The Vivaldi Aerial'.

2 Meter Skeleton Slot Antenna

The Vivaldi antenna can be made ​​of thin copper sheets or simple double-laminated printed circuit board material. Its properties, such as the thickness of the carrier material and its dielectric constant have an influence on the properties of the antenna. A couple of antennas can be made on the same circuit board next to each other as a group antenna.

2 Meter Slot Cube Antenna

The antenna itself consists only of the tapered slot, which can be considered as a two-dimensional exponential horn. The feeding of the antenna is on the narrow side slot. The opposite side to the beam direction is short-circuited by a λ/4-stub. To increase the bandwidth of the antenna, this stub may be designed to be circular with a diameter of one-quarter wavelength of the center frequency. The supply line with the circular sector on its end is made on the second printed circuit board level. It has the function to broadband matching of the supply system in stripline technology.

The polarization of a single radiator is linear. The electric field lines are parallel to the printed circuit board material. The the printed boards with the antenna groups can also be nested crosswise for a second plane of polarization. The beam direction of the antenna is the direction in which the conical slot expands. Due to the large bandwidth, this antenna shape is suitable for ultra-wideband applications.

This antenna has 3 main categories:

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• In Coplanar Vivaldi antenna two radiator planes are on the same side of the dielectric material. The antenna can be fed by aperture coupling from the other side as depicted in Figure 1.
• The Antipodal Vivaldi antenna is proposed to solve the feeding in coplanar ones. In this type of Vivaldi antenna one of the layers is printed on top and the other one which is tapered in opposite direction is printed on the bottom of the dielectric substrate material. This antenna can be fed easily by soldering the connector to the two sides of the PCB material. This antenna is similar to that described in Figure 2 but without the top layer and its supportive substrate.
• The Balanced antipodal Vivaldi antenna (BAVA) consists of three copper layers. An dielectric layer has been added on top of the antipodal structure and an additional metal plate just like the one in the bottom of the antenna has been printed on top of the newly added layer.